相关概念介绍
Docker是一个开源的应用容器引擎，让开发者可以打包他们的应用以及依赖到一个可移植的容器中，然后发布到任何流行的linux机器上，也可以实现虚拟化，容器是完全使用沙箱机制，互相之间不会有任何接口。
Docker有几个重要概念：
- dockerfile，配置文件，用来生成docker image
- docker image ，交付部署的最小单元
- docker命令与API，定义命令与接口，支持第三方系统集成
鲸鱼背上有集装箱
蓝色的海洋----------宿主机系统Windows10
鲸鱼-----------------docker
集装箱---------------容器实例 from 来自我们的镜像模板
Docker的重要组成部分
docker的整个生命周期有三部分组成：镜像（image）+容器（container）+仓库（repository）；
docker在contos7下的安装
1、sudo yum install -y yum-utils
2、sudo yum-config-manager
–add-repo
https://download.docker.com/linux/centos/docker-ce.repo
3、sudo yum-config-manager --enable docker-ce-nightly
4、sudo yum-config-manager --enable docker-ce-test
5、yum-config-manager --disable docker-ce-nightly
6、yum install docker-ce docker-ce-cli containerd.io
如果之前安装过docker需要在安装前执行卸载操作：
sudo yum remove docker
docker-client
docker-client-latest
docker-common
docker-latest
docker-latest-logrotate
docker-logrotate
docker-engine
阿里云镜像加速地址：https://9p4r9rjm.mirror.aliyuncs.com
阿里云加速器地址：https://cr.console.aliyun.com/cn-hangzhou/instances/mirrors
在centos7系统中配置加速地址：
vim /etc/docker/daemon.json #可能本地没有此文件
{
“registry-mirrors”: [“https://9p4r9rjm.mirror.aliyuncs.com”]
}
systemctl daemon-reload
systemctl start docker
如果启动报如下错误：
Job for docker.service failed because start of the service was attempted too often. See “systemctl status docker.service” and “journalctl -xe” for details.
To force a start use “systemctl reset-failed docker.service” followed by “systemctl start docker.service” again.
解决办法：
[root@izuf6d7j6gct081hm8qivez docker]# mv daemon.json daemon.conf #重名了配置文件
[root@izuf6d7j6gct081hm8qivez docker]# systemctl restart docker #重启docker进程
[root@izuf6d7j6gct081hm8qivez docker]# ps aux |grep docker #查看docker进程
root 6458 3.1 3.5 570520 66760 ? Ssl 10:22 0:00 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
root 6738 0.0 0.0 112728 968 pts/0 S+ 10:22 0:00 grep --color=auto docker
问题解决！
docker是如何工作的
docker是一个Client-Server结构的系统，docker守护进程运行在主机上，然后通过socket连接从客户端访问，守护进程从客户端接收命令并管理运行在主机上的容器，容器，是一个运行时环境，类似于集装箱。
为什么docker比vm快
1）docker有着比虚拟机更少的抽象层。由于docker不需要Hypervisor实现硬件资源虚拟化，运行在docker容器上的程序直接使用的都是实际物理机的硬件资源。因此在CPU、内存利用率上docker将会在效率上有明显优势。
2）docker利用的是宿主机的内核，而不需要Guest OS。因此，当新建容器时，docker不需要和虚拟机一样重新加载一个操作系统内核。仍而避免引寻、加载操作系统内核返个比较费时费资源的过程，当新建一个虚拟机时，
虚拟机软件需要加载Guest OS，返个新建过程是分钟级别的。而docker由于直接利用宿主机的操作系统，则省略了返个过程，因此新建一个docker容器只需要几秒钟。
| Docker容器 | 虚拟机（VM） | |
|---|---|---|
| 操作系统 | 与宿主机共享OS | 宿主机OS上运行虚拟机OS |
| 存储大小 | 镜像小，便于存储与传输 | 镜像庞大（vmdk、vdi等） |
| 运行性能 | 几乎无额外性能损失 | 操作系统额外的CPU、内存消耗 |
| 移植性 | 轻便、灵活，适用于linux | 笨重，与虚拟化技术耦合度高 |
| 硬件亲和性 | 面向软件开发者 | 面向硬件运维者 |
| 部署速度 | 快速，秒级 | 较慢，10s以上 |
常见的docker命令
常见docker帮助命令
docker version #显示版本信息
docker info #显示详细的docker信息
docker --help #docker的帮助信息
常见docker镜像命令
[root@host221 ~]# docker images
REPOSITORY TAG IMAGE ID CREATE SIZE
hello-world latest bf756fb1ae65 12 months ago 13.3kB
各项说明：
REPOSITORY：表示镜像仓库源
TAG：镜像的标签
IMAGE ID：镜像ID
CREATED：镜像创建时间
SIZE：镜像大小
说明：同一仓库源可以有多个TAG，代表这个仓库源的不同版本，我们使用REPOSITORY:TAG来定义不同的镜像。
如果你不指定一个镜像版本标签，例如你使用ubuntu，docker将默认使用Ubuntu:lastest镜像。后期我们可以操作REPOSITORY或者IMAGE ID。
docker images options说明： #宿主机上的镜像
| -a | 列出本地所有镜像（含中间映射层） |
|---|---|
| -q | 只列镜像ID |
| –digests | 显示镜像的摘要信息 |
| –no-trunc | 显示完整的镜像信息 |
查看本地已有镜像：
[root@host221 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
tomcat latest 040bdb29ab37 13 days ago 649MB
nginx latest f6d0b4767a6c 2 weeks ago 133MB
centos latest 300e315adb2f 7 weeks ago 209MB
hello-world latest bf756fb1ae65 13 months ago 13.3kB
docker search说明：
| -no-trunc | 显示完整镜像描述 |
|---|---|
| -s | 列出收藏不小于指定值的镜像 |
| -automated | 只列出automated build类型的镜像 |
docker search 某某镜像的名字，如：
[root@host221 ~]# docker search tomcat
注意：搜索是在htts://hub.docker.com中进行搜索，拉去是从阿里云中进行拉取
[root@host221 ~]# docker search -s 30 tomcat
列出点赞数不少于30的Tomcat
docker pull 拉取镜像说明：
docker pull tomcat 等价于 docker pull Tomcat:latest #latest是最新版，这个默认是省略的，就是默认拉取最新版，如果需要拉取其他版本如：
[root@host221 ~]# docker pull tomcat:5.6
docker rmi 删除镜像：
删除单个镜像 docker rmi 镜像名或者镜像ID
[root@host221 ~]# docker rmi hello-world
Error response from daemon: conflict: unable to remove repository reference "hello-world" (must force) - container 937a42725473 is using its referenced image bf756fb1ae65
强行删除
[root@host221 ~]# docker rmi -f hello-world
Untagged: hello-world:latest
Untagged: hello-world@sha256:31b9c7d48790f0d8c50ab433d9c3b7e17666d6993084c002c2ff1ca09b96391d
Deleted: sha256:bf756fb1ae65adf866bd8c456593cd24beb6a0a061dedf42b26a993176745f6b
删除多个镜像，中间以空格分隔
docker rmi 镜像1 镜像2 ...
全部删除
docker rmi -f $(docker images -qa) #-qa是查询当前环境所有的ID
注意：如果镜像在运行中是无法删除的，可以通过-f参数强行删除
常见docker 容器命令
新建并启动容器
语法：docker run [OPTIONS] IMAGE [COMMAND] [ARG…]
OPTIONS说明（常用）：有些是一个减号，有些是两个减号
| –name | =“容器新名字”：为容器指定一个名称 |
|---|---|
| -d | 后台运行容器，并返回容器ID，也即启动守护式容器 |
| -i | 以交互模式运行容器，通常与-t同时使用 |
| -t | 为容器重新分配一个伪输入终端，通常与-i同时使用 |
| -P | 随机端口映射 |
| -p | 指定端口映射 |
-p 有四种格式：
1.ip:hostPort:containerPort
2.ip::containerPort
3.hostPort:containerPort
4.containerPort
常用的参数：-i -t 一般会写在一起，-it
[root@host221 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
tomcat latest 040bdb29ab37 2 weeks ago 649MB
nginx latest f6d0b4767a6c 2 weeks ago 133MB
centos latest 300e315adb2f 7 weeks ago 209MB
hello-world latest bf756fb1ae65 13 months ago 13.3kB
[root@host221 ~]# docker run -it 300e315adb2f
[root@7f98f4cfb7cf /]# ls
bin dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var
[root@7f98f4cfb7cf /]#
此时已经在docker镜像centos的目录中了，所有ls显示的目录也是docker镜像centos的目录
docker ps 命令
默认显示当前正在运行的容器
OPTIONS说明（常用）：
| -a | 列出当前所有正在运行的容器+历史上运行过的 |
|---|---|
| -l | 显示最近创建的容器 |
| -n | 显示最近n个创建的容器 |
| -q | 静默模式，只显示容器编号 |
| -no-trunc | 不截断输出 |
查询有多少个容器在运行
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4d8e6dd4c3c8 300e315adb2f "/bin/bash" 9 hours ago Up 9 hours practical_pare
[root@4d8e6dd4c3c8 /]# ls
bin dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var
[root@4d8e6dd4c3c8 /]# exit #停止容器并退出
exit
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[root@host221 ~]# docker ps -l #查看上一个运行的容器
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7f98f4cfb7cf 300e315adb2f "/bin/bash" 3 hours ago Exited (130) 2 hours ago relaxed_bohr
[root@host221 ~]#
[root@host221 ~]# docker ps -a #查看现在运行的和原来运行过的
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7f98f4cfb7cf 300e315adb2f "/bin/bash" 3 hours ago Exited (130) 2 hours ago relaxed_bohr
4d8e6dd4c3c8 300e315adb2f "/bin/bash" 11 hours ago Exited (0) 4 minutes ago practical_pare
70182ecc8453 hello-world "/hello" 11 hours ago Exited (0) 11 hours ago affectionate_tesla
937a42725473 hello-world "/hello" 28 hours ago Exited (0) 28 hours ago epic_noether
[root@host221 ~]#
[root@host221 ~]# docker ps -n 2 #把上两次运行的列出来
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7f98f4cfb7cf 300e315adb2f "/bin/bash" 3 hours ago Exited (130) 2 hours ago relaxed_bohr
4d8e6dd4c3c8 300e315adb2f "/bin/bash" 11 hours ago Exited (0) 7 minutes ago practical_pare
[root@host221 ~]# #只显示上一个运行容器的ID
[root@host221 ~]# docker ps -ql
7f98f4cfb7cf
[root@host221 ~]# docker run -it --name mycentos0115 centos #运行docker的centos容器，并起别名为mycentos0115
[root@288c6aaca880 /]#
docker port命令
在linux命令行查看docker内端口情况
docker port 容器id
退出容器
两种退出方式：
1.exit 容器停止退出
2.ctrl+P+Q 容器不停止退出
启动容器
docker start 容器ID或者容器名
[root@host221 ~]# docker ps -n 2 #查看上两次运行的，可以从STATUS看出来第一个是正在运行的，第二个是停掉的
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
288c6aaca880 centos "/bin/bash" 10 minutes ago Up 10 minutes mycentos0115
7f98f4cfb7cf 300e315adb2f "/bin/bash" 3 hours ago Exited (130) 3 hours ago relaxed_bohr
[root@host221 ~]# docker start 7f98f4cfb7cf #把第二个停掉的在从新启动
7f98f4cfb7cf
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
288c6aaca880 centos "/bin/bash" 10 minutes ago Up 10 minutes mycentos0115
7f98f4cfb7cf 300e315adb2f "/bin/bash" 3 hours ago Up 7 seconds relaxed_bohr
[root@host221 ~]#
重启容器
docker restart 容器ID或者容器名
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
288c6aaca880 centos "/bin/bash" 16 minutes ago Up 16 minutes mycentos0115
7f98f4cfb7cf 300e315adb2f "/bin/bash" 3 hours ago Up 5 minutes relaxed_bohr
[root@host221 ~]# docker restart 288c6aaca880 #重启contos容器
288c6aaca880 #启动完成会返回ID
[root@host221 ~]# docker ps #通过时间能判断出来是否重启完成
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
288c6aaca880 centos "/bin/bash" 17 minutes ago Up 22 seconds mycentos0115
7f98f4cfb7cf 300e315adb2f "/bin/bash" 3 hours ago Up 6 minutes relaxed_bohr
停止容器
docker stop 容器ID或者容器名
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
288c6aaca880 centos "/bin/bash" 17 minutes ago Up 22 seconds mycentos0115
7f98f4cfb7cf 300e315adb2f "/bin/bash" 3 hours ago Up 6 minutes relaxed_bohr
[root@host221 ~]# docker stop 288c6aaca880 #停止centos容器
288c6aaca880
[root@host221 ~]# docker ps #查看进程已经没有centos的容器了
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7f98f4cfb7cf 300e315adb2f "/bin/bash" 3 hours ago Up 9 minutes relaxed_bohr
[root@host221 ~]#
强制停止容器
docker kill 容器ID或者容器名
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7f98f4cfb7cf 300e315adb2f "/bin/bash" 3 hours ago Up 9 minutes relaxed_bohr
[root@host221 ~]# docker kill 7f98f4cfb7cf #直接杀死该进程，相对stop比较暴力
7f98f4cfb7cf
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
删除已停掉的容器
docker rm 容器ID
[root@host221 ~]# docker ps -n 2 #查看上两次运行的
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
288c6aaca880 centos "/bin/bash" 29 minutes ago Exited (0) 8 minutes ago mycentos0115
7f98f4cfb7cf 300e315adb2f "/bin/bash" 3 hours ago Exited (137) 4 minutes ago relaxed_bohr
[root@host221 ~]# docker rm 288c6aaca880 #删除已停止的contos容器
288c6aaca880
一次性删除多个容器
docker rm -f $(docker ps -a -q) 或 docker ps -a -q |xargs docker rm
[root@host221 ~]# docker ps -a -q
7f98f4cfb7cf
4d8e6dd4c3c8
70182ecc8453
937a42725473
[root@host221 ~]# docker rm -f $(docker ps -a -q) #一次删除全部容器
7f98f4cfb7cf
4d8e6dd4c3c8
70182ecc8453
937a42725473
[root@host221 ~]# docker ps -a -q
[root@host221 ~]#
重要部分
启动守护式容器
docker run -d 容器名
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[root@host221 ~]# docker run -d centos #后台启动centos容器
572ff64b0f4d104de694b5abbc3f40f3075063a32bc65999f8af3a4cc6bb7cb5
[root@host221 ~]# docker ps #后台启动后发现查不到centos的进程
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
问题：后台启动一个centos的容器，发现用docker -ps -a进行查看，会发现容器已经退出，很重要的要说明一点：Docker容器后台运行，就必须有一个前台进程，容器运行的命令如果不是那些一直挂起的命令（比如运行top，tail），就是会自动退出的
这个是docker的机制问题，比如你的web容器，我们以nginx为例，正常情况下，我们配置启动服务只需要启动响应的service即可，例如service nginx start
但是，这样，nginx为后台进程模式运行，就导致docker前台没有运行的应用，这样的容器后台启动后，会立即自杀因为他觉得他没事可做了，所以，最佳的解决方案是，将你要运行的程序以前台进程的形式运行
查看容器日志
docker logs -f -t --tail 容器ID # -t 是加入时间戳； -f 跟随最新的日志打印； --tail 数字 显示最后多少条
查看容器内部进程
docker top 容器ID
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2cc8820777b1 centos "/bin/sh -c 'while t…" 3 minutes ago Up 3 minutes interesting_wiles
[root@host221 ~]# docker top 2cc8820777b1 #查看容器内部运行的进程
UID PID PPID C STIME TTY TIME CMD
root 9307 9285 0 10:30 ? 00:00:00 /bin/sh -c while true; do echo hello world; sleep 2; done
root 17767 9307 0 10:34 ? 00:00:00 /usr/bin/coreutils --coreutils-prog-shebang=sleep /usr/bin/sleep 2
查看容器内部细节
docker inspect 容器ID #以json键值对的形式显示容器内的全部细节
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
2cc8820777b1 centos "/bin/sh -c 'while t…" 8 minutes ago Up 8 minutes interesting_wiles
[root@host221 ~]# docker inspect 2cc8820777b1
[
{
"Id": "2cc8820777b186bcffd2fd6266f534808bd8b40d0a5175b9a52074b2d97a518a",
"Created": "2021-01-28T02:30:27.075972956Z",
"Path": "/bin/sh",
"Args": [
"-c",
"while true; do echo hello world; sleep 2; done"
],
"State": {
"Status": "running",
"Running": true,
......
进入正在运行的容器并以命令行交互
docker exec -it 容器ID bashShell #在容器外执行容器内的命令
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7ffd7d95f2f8 centos "/bin/bash" 4 minutes ago Up 4 minutes vibrant_proskuriakova
[root@host221 ~]# docker exec -t 7ffd7d95f2 ls -l /tmp #在容器外（宿主机）执行容器内的命令
total 8
-rwx------ 1 root root 701 Dec 4 17:37 ks-script-esd4my7v
-rwx------ 1 root root 671 Dec 4 17:37 ks-script-eusq_sc5
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7ffd7d95f2f8 centos "/bin/bash" 9 minutes ago Up 9 minutes vibrant_proskuriakova
[root@host221 ~]# docker exec -t 7ffd7d95f2f8 /bin/bash #exec也可以直接进入容器内
[root@7ffd7d95f2f8 /]#
重新进入docker attach 容器ID
[root@host221 ~]# docker run -it centos #运行centos的容器
[root@7ffd7d95f2f8 /]# [root@host221 ~]# #ctrl+p+q切到后台运行
[root@host221 ~]# docker ps #查看centos的容器正在运行
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7ffd7d95f2f8 centos "/bin/bash" 49 seconds ago Up 48 seconds vibrant_proskuriakova
[root@host221 ~]# docker attach 7ffd7d95f2f8 #重新进入centos的容器
[root@7ffd7d95f2f8 /]#
上述两个区别：
attach 直接进入容器启动命令终端，不会启动新的进程
exec 是在容器中打开新的终端，并且可以启动新的进程
从容器内拷贝文件到主机上
docker cp 容器ID：容器内路径 目的主机路径
[root@host221 ~]# ll #查看宿主机root目录下的文件
总用量 197476
-rw-------. 1 root root 1323 8月 11 2019 anaconda-ks.cfg
drwxr-xr-x 9 root root 220 12月 12 21:38 apache-tomcat-8.5.60
-rw-r--r-- 1 root root 10488933 12月 11 18:20 apache-tomcat-8.5.60.tar.gz
-rwxr-xr-x 1 root root 5532 12月 11 16:50 install_nginx_v0.0.2.sh
-rw-r--r-- 1 root root 191710050 12月 12 20:23 jdk1.8.0_191.tgz
drwxr-xr-x 2 root root 6 1月 1 16:16 jenkins
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7ffd7d95f2f8 centos "/bin/bash" 22 minutes ago Up 21 minutes vibrant_proskuriakova
[root@host221 ~]# docker cp 7ffd7d95f2f8:/tmp/a.txt /root #拷贝容器中tmp目录的a.txt文件到宿主机root目录下
[root@host221 ~]# ll
总用量 197476
-rw-------. 1 root root 1323 8月 11 2019 anaconda-ks.cfg
drwxr-xr-x 9 root root 220 12月 12 21:38 apache-tomcat-8.5.60
-rw-r--r-- 1 root root 10488933 12月 11 18:20 apache-tomcat-8.5.60.tar.gz
-rw-r--r-- 1 root root 0 1月 28 11:12 a.txt
-rwxr-xr-x 1 root root 5532 12月 11 16:50 install_nginx_v0.0.2.sh
-rw-r--r-- 1 root root 191710050 12月 12 20:23 jdk1.8.0_191.tgz
drwxr-xr-x 2 root root 6 1月 1 16:16 jenkins
从宿主机上拷贝文件到容器内
docker cp 宿主机路径/文件 容器ID：容器目录
[root@7ffd7d95f2f8 tmp]# ls #查看容器tmp路径下文件
a.txt ks-script-esd4my7v ks-script-eusq_sc5
[root@host221 ~]# docker ps #查看容器的进程，主要是ID
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7ffd7d95f2f8 centos "/bin/bash" 29 minutes ago Up 29 minutes vibrant_proskuriakova
[root@host221 ~]# docker cp /root/b.txt 7ffd7d95f2f8:/tmp #拷贝宿主机上的b.txt文件到容器tmp
[root@host221 ~]# docker attach 7ffd7d95f2f8
[root@7ffd7d95f2f8 tmp]# ls
a.txt b.txt ks-script-esd4my7v ks-script-eusq_sc5
镜像
概念
镜像是一种轻量级、可执行的独立软件包，用来打包软件运行环境和基于运行环境开发的软件，它包含某个软件所需的所有内容，包含
代码、运行时、库、环境变量和配置文件。
是什么
docker镜像加载的原理：
docker的镜像实际上是由一层一层的文件系统组成，这种层级的文件系统UnionFS
bootfs(boot file system)主要包含bootloader和kernel，bootloader主要是引导加载kernel，linux刚启动时会加载bootfs文件系统，在docker镜像的最底层是bootfs。这一层与我们典型的linux/unix系统是一样的，包含boot加载器和内核，当boot加载完成之后整个内核就都在内存中了，此时内存的使用权已由bootfs转交给内核，此时系统也会卸载bootfs。
rootfs(root file system)，在bootfs之上。包含的就是典型的liunx系统中的/dev，/proc，/bin，/etc等标准目录和文件。rootfs就是各种不同的操作系统发行版，比如Ubuntu，Centos等等。
对于一个精简的OS，rootfs可以很小，只需要包括最基本的命令、工具和程序库就可以了，因为底层直接用Host的kernel，自己只需要提供rootfs就行了。由此可一件对于不同的linux发行版，bootfs基本是一致的，rootfs会有差别，因此不同的发行版可以共用bootfs。
特点
Docker镜像都是只读的。当容器启动时，一个新的可写层被加载到镜像的顶部。这一层通常被称作“容器”，“容器层”之下的都叫“镜像层”。
Docker镜像commit操作补充
docker commit提交容器副本使之成为一个新的镜像；docker commit -m=“提交的描述信息” -a=“作者” 容器ID要创建的目标镜像名：[标签名]
案例
从hub上下载tomcat镜像到本地并成功运行
docker run -it -p 8999:80 nginx
-p（小p） 主机端口：docker容器端口
-P （大P）随机分配端口
[root@host221 ~]# docker run -it -p 8999:80 nginx #启动nginx容器，映射宿主机的8999端口
/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
/docker-entrypoint.sh: Configuration complete; ready for start up
192.168.21.1 - - [28/Jan/2021:07:40:10 +0000] "GET / HTTP/1.1" 200 612 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36" "-"
2021/01/28 07:40:10 [error] 29#29: *1 open() "/usr/share/nginx/html/favicon.ico" failed (2: No such file or directory), client: 192.168.21.1, server: localhost, request: "GET /favicon.ico HTTP/1.1", host: "192.168.21.130:8999", referrer: "http://192.168.21.130:8999/"
192.168.21.1 - - [28/Jan/2021:07:40:10 +0000] "GET /favicon.ico HTTP/1.1" 404 555 "http://192.168.21.130:8999/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36" "-"
然后在输入宿主机IP+8999端口可以访问到容器的nginx服务
进入到运行的nginx容器中：
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
38ec3b886394 nginx "/docker-entrypoint.…" 21 minutes ago Up 21 minutes 0.0.0.0:8999->80/tcp intelligent_mahavira
[root@host221 ~]# docker exec -it 38ec3b886394 /bin/bash #进入到nginx的容器中
root@38ec3b886394:/# pwd
/
用原理的nginx镜像生成一个改过的nginx镜像，命名为mynginx1.2
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f248815493f6 nginx "/docker-entrypoint.…" 21 seconds ago Up 20 seconds 0.0.0.0:8777->80/tcp elegant_varahamihira
[root@host221 ~]# docker commit -a="gxy" -m="nginx new" f248815493f6 atg/mynginx:1.2
sha256:26eae4e26713855a2fd7a721dc31eb753e1649edd63678ee06f494d8e8970225
[root@host221 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
atg/mynginx 1.2 26eae4e26713 7 seconds ago 133MB
tomcat latest 040bdb29ab37 2 weeks ago 649MB
nginx latest f6d0b4767a6c 2 weeks ago 133MB
centos latest 300e315adb2f 7 weeks ago 209MB
hello-world latest bf756fb1ae65 13 months ago 13.3kB
停掉所有正在运行的容器实例
[root@host221 ~]# docker ps #有两个在运行
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
508f3337fa2e nginx "/docker-entrypoint.…" 55 seconds ago Up 54 seconds 0.0.0.0:8666->80/tcp quirky_moser
cdd10749293f atg/mynginx:1.2 "/docker-entrypoint.…" 3 minutes ago Up 3 minutes 0.0.0.0:8999->80/tcp hopeful_wilbur
[root@host221 ~]# docker rm -f $(docker ps -q) #停掉所有正在运行的实例
508f3337fa2e
cdd10749293f
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
后台运行容器：
docker run -d -p 8666:80 nginx
[root@host221 ~]# docker run -d -p 8666:80 nginx #后台运行nginx容器，映射宿主机的8666端口
d0068951f895265fa0c40fab7181bf3366025f1aaedac5524a9968f434ce3f61
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
d0068951f895 nginx "/docker-entrypoint.…" 10 seconds ago Up 10 seconds 0.0.0.0:8666->80/tcp happy_hertz
[root@host221 ~]#
Docker容器数据卷
是什么
先来看下docker的理念：
将运用与运行的环境进行打包形成容器运行，运行可以伴随着容器，但是我们对数据的要求希望是持久化的
容器之间希望有可能共享数据
docker容器产生的数据，如果不通过docker commit生成新的镜像，使得数据作为镜像的一部分保存下来，那么当容器删除后，数据自然也就没有了。
为了能保存数据在docker中我们使用卷。
能干嘛
卷就是我们的目录或文件，存在于一个或多个容器中，有docker挂载到容器，但不属于联合文件系统，因此能够绕过Union File System提供一些用于持续存储或共享数据的特性：
卷的设计目的就是数据的持久化，完全独立于容器的生存周期，因此Docker不会在容器删除时删除其挂在的数据卷
特点
- 数据卷可在容器之间共享或重用数据
- 卷中的更改可以直接生效
- 数据卷中的更改不会包含在镜像的更新中
- 数据卷的生命周期一直持续到没有容器使用它为止
容器的持久化
容器间的继承+共享数据
数据卷
容器内添加：
直接命令添加
命令：docker run -it -v /宿主机绝对路径目录：/容器内目录 镜像名
容器：
[root@host221 ~]# docker run -it -v /myDataVolume:/dataVolumeContainer centos #在宿主机和容器创建对应目录
[root@0e9f35ee1d07 /]# ls
bin dataVolumeContainer dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var
宿主机：
[root@host221 ~]# ls /
bin boot data dev etc home lib lib64 media mnt myDataVolume opt proc root run sbin srv sys tmp usr var
注意：原宿主机是没有myDataVolume目录，容器中也没有dataVolumeContainer目录，-v就相当于mkdir
查看数据卷是否挂载成功
通过docker inspect 命令查看绑定关系
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0e9f35ee1d07 centos "/bin/bash" 6 minutes ago Up 6 minutes serene_varahamihira
[root@host221 ~]# docker inspect 0e9f35ee1d07
......
"HostConfig": {
"Binds": [
"/myDataVolume:/dataVolumeContainer" #通过主机配置信息能看出来绑定关系
],
......
"Mounts": [
{
"Type": "bind",
"Source": "/myDataVolume",
"Destination": "/dataVolumeContainer",
"Mode": "",
"RW": true, #说明现在对容器中的dataVolumeContainer目录具有读写权限
"Propagation": "rprivate"
}
],
......
容器和宿主机之间数据共享
在宿主机上的myDataVolume中创建host.txt文件
[root@host221 /]# cd myDataVolume/
[root@host221 myDataVolume]# ls
[root@host221 myDataVolume]# mkdir host.txt
在容器dataVolumeContainer目录中查看是否生成host.txt文件
[root@0e9f35ee1d07 dataVolumeContainer]# ls
host.txt
同样在容器的dataVolumeContainer目录创建a.txt
[root@0e9f35ee1d07 dataVolumeContainer]# mkdir a.txt
[root@0e9f35ee1d07 dataVolumeContainer]# ls
a.txt host.txt
在宿主机上myDataVolume目录中查看a.txt是否同步
[root@host221 myDataVolume]# ls
a.txt host.txt
在对容器中dataVolumeContainer目录中的a.txt和host进行修改，宿主机对应绑定的目录下的文件也会随之修改，反之一样
容器停止退出后，主机修改后数据是否同步
[root@host221 myDataVolume]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
停掉容器只会在主机对应的myDataVolume目录中追加内容为1-6的b.txt的文件
[root@host221 myDataVolume]# echo "123456" >b.txt
启动容器
[root@host221 myDataVolume]# docker ps -l
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0e9f35ee1d07 centos "/bin/bash" 42 minutes ago Up 6 minutes serene_varahamihira
[root@host221 myDataVolume]# docker start 0e9f35ee1d07
0e9f35ee1d07
进入容器
[root@host221 ~]# docker attach 0e9f35ee1d07
[root@0e9f35ee1d07 /]# cd dataVolumeContainer/
[root@0e9f35ee1d07 dataVolumeContainer]# ls
a.txt b.txt host.txt
总结：当容器停止后，更新宿主机上绑定目录下文件，启动容器后仍会进行数据同步
命令（带权限）
将容器停掉，把容器和宿主机上的对应目录全部删掉，从新创建
[root@host221 /]# docker run -it -v /myDataVolume:/dataVolumeContainer:ro centos #重新创建对应同步目录，ro=read only
[root@host221 myDataVolume]# echo "123"> c.txt #创建内容为123的文件
在容器端查看
[root@host221 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
ee6d8e64b852 centos "/bin/bash" 24 seconds ago Up 23 seconds jovial_spence
[root@host221 ~]# docker attach ee6d8e64b852
[root@ee6d8e64b852 /]# ls
bin dataVolumeContainer dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var
[root@ee6d8e64b852 dataVolumeContainer]# touch d.txt
touch: cannot touch 'd.txt': Read-only file system
[root@ee6d8e64b852 dataVolumeContainer]# cat c.txt
123
总结：容器中只有读权限，无法编辑文件和创建文件
DockerFile添加（可以在容器内添加多个）
编辑Dockerfile文件
# volume ttest
FROM centos #基于centos镜像
VOLUME ["/dataVolumeContainer1","/dataVolumeContainer2"] #在容器内创建两个同步目录
CMD echo "finished,--------success1" #完成后打印success消息
CMD /bin/bash
说明：就是在容器内部创建两个共享目录
用DockerFile在容器内添加多个同步文件夹
[root@izuf6d7j6gct081hm8qivez mydocker]# docker build -f /mydocker/Dockerfile -t gxy/centos . #-f是文件的意思
Sending build context to Docker daemon 2.048kB
Step 1/4 : FROM centos
---> 300e315adb2f
Step 2/4 : VOLUME ["/dataVolumeContainer1","/dataVolumeContainer2"]
---> Running in 9aefefd69937
Removing intermediate container 9aefefd69937
---> 46e94e284d80
Step 3/4 : CMD echo "finished,--------success1"
---> Running in 27a7c201cef4
Removing intermediate container 27a7c201cef4
---> 35ac5c0f29d0
Step 4/4 : CMD /bin/bash
---> Running in e935c6153112
Removing intermediate container e935c6153112
---> 442d7713764e
Successfully built 442d7713764e
Successfully tagged gxy/centos:latest
从上边的命令我们可以看出来是没有在宿主机上创建文件同步夹的
查看镜像文件，发现刚才构建好的镜像已经在镜像列表中了
[root@izuf6d7j6gct081hm8qivez mydocker]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
gxy/centos latest 442d7713764e 3 hours ago 209MB
centos latest 300e315adb2f 7 weeks ago 209MB
启动构建好的容器
[root@izuf6d7j6gct081hm8qivez mydocker]# docker images gxy/centos
REPOSITORY TAG IMAGE ID CREATED SIZE
gxy/centos latest 442d7713764e 3 hours ago 209MB
[root@izuf6d7j6gct081hm8qivez mydocker]# docker run -it gxy/centos
[root@a066d630f0a1 /]# ls
bin dataVolumeContainer1 dataVolumeContainer2 dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var
可以看到我们刚才创建的两个目录已在容器中生成
查看在宿主机上生成的同步目录
[root@izuf6d7j6gct081hm8qivez ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a066d630f0a1 gxy/centos "/bin/sh -c /bin/bash" 11 minutes ago Up 11 minutes heuristic_rosalind
[root@izuf6d7j6gct081hm8qivez ~]# docker inspect a066d630f0a1
"Mounts": [
{
"Type": "volume",
"Name": "09fe41d1dabe056a42eb056d14fda256e03866f5faca71cd9614a96ac0ec1be7",
"Source": "/var/lib/docker/volumes/09fe41d1dabe056a42eb056d14fda256e03866f5faca71cd9614a96ac0ec1be7/_data",
"Destination": "/dataVolumeContainer1",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
},
{
"Type": "volume",
"Name": "5d6e16470035d159d0be28976011c970b6aed1e4e684eeaf30153522042990d0",
"Source": "/var/lib/docker/volumes/5d6e16470035d159d0be28976011c970b6aed1e4e684eeaf30153522042990d0/_data",
"Destination": "/dataVolumeContainer2",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
}
],
可以看到宿主机目录为/var/lib/docker/volumes/5d6e16470035d159d0be28976011c970b6aed1e4e684eeaf30153522042990d0/_data
用DockerFile自定义的镜像文件可以自定义，例如如上添加两个同步文件的操作
进入宿主机查看是否生成该目录
[root@izuf6d7j6gct081hm8qivez ~]# cd /var/lib/docker/volumes/5d6e16470035d159d0be28976011c970b6aed1e4e684eeaf30153522042990d0/_data
[root@izuf6d7j6gct081hm8qivez _data]# pwd
/var/lib/docker/volumes/5d6e16470035d159d0be28976011c970b6aed1e4e684eeaf30153522042990d0/_data
查看是否进行数据同步
在容器上创建文件
[root@a066d630f0a1 dataVolumeContainer2]# echo "123">host.txt
在宿主机上查看是否同步
[root@izuf6d7j6gct081hm8qivez _data]# ls
host.txt
[root@izuf6d7j6gct081hm8qivez _data]# cat host.txt
123
[root@izuf6d7j6gct081hm8qivez _data]# pwd
/var/lib/docker/volumes/5d6e16470035d159d0be28976011c970b6aed1e4e684eeaf30153522042990d0/_data
已同步
DockerFile
是什么
DockerFile是用来构建docker镜像的构建文件，是由一系列的命令和参数构成的脚本。
三步骤
手动写一个DockerFile文件，当然，必须要符合file的规范 #编写
有这个文件后，直接docker build命令执行，获得一个自定义的镜像 #构建
run #执行
dockerfile 以centos为例的官方file文件
FROM scratch
ADD centos-7-x86_64-docker.tar.xz /
LABEL \
org.label-schema.schema-version="1.0" \
org.label-schema.name="CentOS Base Image" \
org.label-schema.vendor="CentOS" \
org.label-schema.license="GPLv2" \
org.label-schema.build-date="20201113" \
org.opencontainers.image.title="CentOS Base Image" \
org.opencontainers.image.vendor="CentOS" \
org.opencontainers.image.licenses="GPL-2.0-only" \
org.opencontainers.image.created="2020-11-13 00:00:00+00:00"
CMD ["/bin/bash"]
DockerFile构建过程解析
dockerfile内容基础知识
1. 每条保留字指令都必须为大写字母且后面要跟随至少一个参数
2. 指令按照从上到下，顺序执行
3. 表示注释
4. 每条指令都会创建一个新的镜像层，并对镜像进行提交
DockerFile执行流程
1. docker从基础镜像运行一个容器
2. 执行一条指令并对容器做出修改
3. 执行类似docker commit的操作提交一个新的镜像层
4. docker再基于刚提交的镜像运行一个新的容器
5. 执行DockerFile中的下一条指令知道所有指令都执行完成
小结
从应用软件的角度来看，DockerFile、Docker镜像与Docker容器分别代表软件的三个不同阶段
- DockerFile是软件的原材料
- docker镜像是软件的交付品
- docker容器则可以人事是软件运行态
Dockerfile面向开发，Docker镜像成为交付标准，Docker容器则涉及部署与运维，三者缺一不可，合力充当Docker体系的基石。
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-hyGQlNZi-1617693557411)(F:\typora相关笔记\DockerFile.jpg)]
DockerFile体系结构（保留字指令）
| FROM | 基础镜像，当前新镜像是基于那个镜像的 |
|---|---|
| MAINTAINER | 镜像维护者的姓名和邮箱地址 |
| RUN | 容器构建时需要运行的命令 |
| EXPOSE | 当前容器对外暴露出的端口号 |
| WORKDIR | 指定在创建容器后，终端默认登录的进来工作目录，一个落脚点 |
| ENV | 用来在构建镜像过程中设置环境变量 |
| ADD | 将宿主机目录下的文件拷贝镜像且ADD命令会自动处理URL和解压tar压缩包 |
| COPY | 类似ADD，拷贝文件和目录到镜像中。将从构建上下文目录中<源路径>的文件/目录复制到新的一层的镜像内的<目标路径>位置 |
| VOLUME | 容器数据卷，用户数据保存和持久化工作 |
| CMD | 指定一个容器启动时要运行的命令。DockerFile中可以有多个CMD指令，但只有一个最后生效，CMD会被docker run之后的参数替换 |
| ENTRYPOINT | 指定一个容器启动时要运行的命令。ENTRYPOINT 的目的的和CMD一样，都是在指定容器期启动程序及参数 |
| ONBUILD | 更新到typora，请在typora中参考 |
ENV：例如：
ENV MY_PATH /usr/mytest
这个环境变量可以在后续的任何RUN指令中使用，这就是如同在命令前面制定了环境变量前缀一样；
比如：WORKEDIR $MY_PATH
COPY：
COPY src dest
COPY[“src”,“dest”]
CMD：
CMD容器启动命令
CMD 指令的格式和 RUN类似，也是两种格式：
shell 格式：CMD<命令>
exec 格式：CMD [“可执行文件”，“参数1”，“参数2”…]
参数列表格式：CMD [“参数1”,“参数2”…]。在指定了 ENTRYPOINT指令后，用CMD指定具体的参数
最后一个CMD的命令是替换之前所有的，只有最后一个生效
ENTRYPOINT：
最后添加的不会把之前的替换掉，而是直接追加
小结：
| BUILD | Both | RUN |
|---|---|---|
| FROM | WORKDIR | CMD |
| MAINTAINER | USER | ENV |
| COPY | EXPOSE | |
| ADD | VOLUME | |
| RUN | ENTRYPOINT | |
| ONBUILD | ||
| .dockerignore |
案例1
编写DockerFile文件
[root@izuf6d7j6gct081hm8qivez ~]# vim DockerFile
from centos
ENV mypath /usr/local
WORKDIR $mypath
RUN yum -y install vim
RUN yum -y install net-tools
EXPOSE 80
CMD /echo $pypath
CMD /echo "success-----ok"
CMD /bin/bash
构建docker镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker build -f /root/DockerFile -t mycentos:1.3 .
Sending build context to Docker daemon 720.4MB
Step 1/9 : from centos
---> 300e315adb2f
Step 2/9 : ENV mypath /usr/local
---> Running in fcf1fb902f35
Removing intermediate container fcf1fb902f35
---> 1c129126e6cc
Step 3/9 : WORKDIR $mypath
---> Running in 6925f8a5ead5
Removing intermediate container 6925f8a5ead5
---> 082f63f9889f
Step 4/9 : RUN yum -y install vim
---> Running in 749b6bbfdfe4
CentOS Linux 8 - AppStream 2.7 MB/s | 6.3 MB 00:02
CentOS Linux 8 - BaseOS 1.5 MB/s | 2.3 MB 00:01
CentOS Linux 8 - Extras 4.3 kB/s | 8.6 kB 00:02
Dependencies resolved.
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
vim-enhanced x86_64 2:8.0.1763-15.el8 appstream 1.4 M
Installing dependencies:
gpm-libs x86_64 1.20.7-15.el8 appstream 39 k
vim-common x86_64 2:8.0.1763-15.el8 appstream 6.3 M
vim-filesystem noarch 2:8.0.1763-15.el8 appstream 48 k
which x86_64 2.21-12.el8 baseos 49 k
Transaction Summary
================================================================================
Install 5 Packages
Total download size: 7.8 M
Installed size: 30 M
Downloading Packages:
(1/5): gpm-libs-1.20.7-15.el8.x86_64.rpm 215 kB/s | 39 kB 00:00
(2/5): vim-filesystem-8.0.1763-15.el8.noarch.rp 707 kB/s | 48 kB 00:00
(3/5): which-2.21-12.el8.x86_64.rpm 633 kB/s | 49 kB 00:00
(4/5): vim-enhanced-8.0.1763-15.el8.x86_64.rpm 1.5 MB/s | 1.4 MB 00:00
(5/5): vim-common-8.0.1763-15.el8.x86_64.rpm 4.5 MB/s | 6.3 MB 00:01
--------------------------------------------------------------------------------
Total 2.3 MB/s | 7.8 MB 00:03
warning: /var/cache/dnf/appstream-02e86d1c976ab532/packages/gpm-libs-1.20.7-15.el8.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 8483c65d: NOKEY
CentOS Linux 8 - AppStream 1.6 MB/s | 1.6 kB 00:00
Importing GPG key 0x8483C65D:
Userid : "CentOS (CentOS Official Signing Key) <security@centos.org>"
Fingerprint: 99DB 70FA E1D7 CE22 7FB6 4882 05B5 55B3 8483 C65D
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : which-2.21-12.el8.x86_64 1/5
Installing : vim-filesystem-2:8.0.1763-15.el8.noarch 2/5
Installing : vim-common-2:8.0.1763-15.el8.x86_64 3/5
Installing : gpm-libs-1.20.7-15.el8.x86_64 4/5
Running scriptlet: gpm-libs-1.20.7-15.el8.x86_64 4/5
Installing : vim-enhanced-2:8.0.1763-15.el8.x86_64 5/5
Running scriptlet: vim-enhanced-2:8.0.1763-15.el8.x86_64 5/5
Running scriptlet: vim-common-2:8.0.1763-15.el8.x86_64 5/5
Verifying : gpm-libs-1.20.7-15.el8.x86_64 1/5
Verifying : vim-common-2:8.0.1763-15.el8.x86_64 2/5
Verifying : vim-enhanced-2:8.0.1763-15.el8.x86_64 3/5
Verifying : vim-filesystem-2:8.0.1763-15.el8.noarch 4/5
Verifying : which-2.21-12.el8.x86_64 5/5
Installed:
gpm-libs-1.20.7-15.el8.x86_64 vim-common-2:8.0.1763-15.el8.x86_64
vim-enhanced-2:8.0.1763-15.el8.x86_64 vim-filesystem-2:8.0.1763-15.el8.noarch
which-2.21-12.el8.x86_64
Complete!
Removing intermediate container 749b6bbfdfe4
---> 74f019b66158
Step 5/9 : RUN yum -y install net-tools
---> Running in 41010c643566
Last metadata expiration check: 0:00:15 ago on Tue Feb 2 01:24:09 2021.
Dependencies resolved.
================================================================================
Package Architecture Version Repository Size
================================================================================
Installing:
net-tools x86_64 2.0-0.52.20160912git.el8 baseos 322 k
Transaction Summary
================================================================================
Install 1 Package
Total download size: 322 k
Installed size: 942 k
Downloading Packages:
net-tools-2.0-0.52.20160912git.el8.x86_64.rpm 3.1 MB/s | 322 kB 00:00
--------------------------------------------------------------------------------
Total 681 kB/s | 322 kB 00:00
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : net-tools-2.0-0.52.20160912git.el8.x86_64 1/1
Running scriptlet: net-tools-2.0-0.52.20160912git.el8.x86_64 1/1
Verifying : net-tools-2.0-0.52.20160912git.el8.x86_64 1/1
Installed:
net-tools-2.0-0.52.20160912git.el8.x86_64
Complete!
Removing intermediate container 41010c643566
---> 9ade25dfe857
Step 6/9 : EXPOSE 80
---> Running in 065dee6f55a4
Removing intermediate container 065dee6f55a4
---> 48bebddd24ab
Step 7/9 : CMD /echo $pypath
---> Running in 11483efc093c
Removing intermediate container 11483efc093c
---> 25ecbac09089
Step 8/9 : CMD /echo "success-----ok"
---> Running in 2e10106de7a7
Removing intermediate container 2e10106de7a7
---> dbd52bd4af5e
Step 9/9 : CMD /bin/bash
---> Running in 108fe7bc8155
Removing intermediate container 108fe7bc8155
---> 51e3e67533a3
Successfully built 51e3e67533a3
Successfully tagged mycentos:1.3
[root@izuf6d7j6gct081hm8qivez ~]#
查看构建好的镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker images mycentos
REPOSITORY TAG IMAGE ID CREATED SIZE
mycentos 1.3 51e3e67533a3 4 minutes ago 291MB
运行新构建的镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker run -it mycentos:1.3
[root@f3ec66329787 local]# pwd
/usr/local
查看是否可以使用vim
[root@f3ec66329787 local]# vim test.txt
[root@f3ec66329787 local]# ls
bin etc games include lib lib64 libexec sbin share src test.txt
[root@f3ec66329787 local]# cat test.txt
fdsaf
ifconfig同样可以使用，这里就不做过多演示了
列出镜像的变更历史
docker history 镜像名
[root@izuf6d7j6gct081hm8qivez ~]# docker images mycentos
REPOSITORY TAG IMAGE ID CREATED SIZE
mycentos 1.3 51e3e67533a3 13 minutes ago 291MB
[root@izuf6d7j6gct081hm8qivez ~]# docker history 51e3e67533a3
IMAGE CREATED CREATED BY SIZE COMMENT
51e3e67533a3 13 minutes ago /bin/sh -c #(nop) CMD ["/bin/sh" "-c" "/bin… 0B
dbd52bd4af5e 13 minutes ago /bin/sh -c #(nop) CMD ["/bin/sh" "-c" "/ech… 0B
25ecbac09089 13 minutes ago /bin/sh -c #(nop) CMD ["/bin/sh" "-c" "/ech… 0B
48bebddd24ab 13 minutes ago /bin/sh -c #(nop) EXPOSE 80 0B
9ade25dfe857 13 minutes ago /bin/sh -c yum -y install net-tools 23.3MB
74f019b66158 13 minutes ago /bin/sh -c yum -y install vim 58.1MB
082f63f9889f 14 minutes ago /bin/sh -c #(nop) WORKDIR /usr/local 0B
1c129126e6cc 14 minutes ago /bin/sh -c #(nop) ENV mypath=/usr/local 0B
300e315adb2f 8 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0B
<missing> 8 weeks ago /bin/sh -c #(nop) LABEL org.label-schema.sc… 0B
<missing> 8 weeks ago /bin/sh -c #(nop) ADD file:bd7a2aed6ede423b7… 209MB
# docker run -it -p 7777:8080 tomcat ls -l 等价于 ls -l /usr/local/tomcat ls -l会覆盖掉之前的启动命令，tomcat不会启动，只会查看tomcat目录
[root@izuf6d7j6gct081hm8qivez ~]# docker run -it -p 7777:8080 tomcat ls -l
total 156
-rw-r--r-- 1 root root 18982 Dec 3 11:48 BUILDING.txt
-rw-r--r-- 1 root root 5409 Dec 3 11:48 CONTRIBUTING.md
-rw-r--r-- 1 root root 57092 Dec 3 11:48 LICENSE
-rw-r--r-- 1 root root 2333 Dec 3 11:48 NOTICE
-rw-r--r-- 1 root root 3257 Dec 3 11:48 README.md
-rw-r--r-- 1 root root 6898 Dec 3 11:48 RELEASE-NOTES
-rw-r--r-- 1 root root 16507 Dec 3 11:48 RUNNING.txt
drwxr-xr-x 2 root root 4096 Feb 1 23:24 bin
drwxr-xr-x 2 root root 4096 Dec 3 11:48 conf
drwxr-xr-x 2 root root 4096 Feb 1 23:24 lib
drwxrwxrwx 2 root root 4096 Dec 3 11:43 logs
drwxr-xr-x 2 root root 4096 Feb 1 23:24 native-jni-lib
drwxrwxrwx 2 root root 4096 Feb 1 23:24 temp
drwxr-xr-x 2 root root 4096 Feb 1 23:24 webapps
drwxr-xr-x 7 root root 4096 Dec 3 11:45 webapps.dist
drwxrwxrwx 2 root root 4096 Dec 3 11:43 work
案例2
编写DockerFile文件
[root@izuf6d7j6gct081hm8qivez ~]# vim DockerFile2
FROM centos
RUN yum install -y curl
CMD [ "curl","-s","http://ip.cn" ]
构建docker镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker build -f /root/DockerFile2 -t myip .
Sending build context to Docker daemon 720.4MB
Step 1/3 : FROM centos
---> 300e315adb2f
Step 2/3 : RUN yum install -y curl
---> Running in 449caac34afb
CentOS Linux 8 - AppStream 3.6 MB/s | 6.3 MB 00:01
CentOS Linux 8 - BaseOS 2.3 MB/s | 2.3 MB 00:00
CentOS Linux 8 - Extras 9.3 kB/s | 8.6 kB 00:00
Package curl-7.61.1-14.el8.x86_64 is already installed.
Dependencies resolved.
================================================================================
Package Architecture Version Repository Size
================================================================================
Upgrading:
curl x86_64 7.61.1-14.el8_3.1 baseos 353 k
libcurl-minimal x86_64 7.61.1-14.el8_3.1 baseos 285 k
Transaction Summary
================================================================================
Upgrade 2 Packages
Total download size: 638 k
Downloading Packages:
(1/2): libcurl-minimal-7.61.1-14.el8_3.1.x86_64 2.5 MB/s | 285 kB 00:00
(2/2): curl-7.61.1-14.el8_3.1.x86_64.rpm 2.5 MB/s | 353 kB 00:00
--------------------------------------------------------------------------------
Total 913 kB/s | 638 kB 00:00
warning: /var/cache/dnf/baseos-f6a80ba95cf937f2/packages/curl-7.61.1-14.el8_3.1.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 8483c65d: NOKEY
CentOS Linux 8 - BaseOS 345 kB/s | 1.6 kB 00:00
Importing GPG key 0x8483C65D:
Userid : "CentOS (CentOS Official Signing Key) <security@centos.org>"
Fingerprint: 99DB 70FA E1D7 CE22 7FB6 4882 05B5 55B3 8483 C65D
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Upgrading : libcurl-minimal-7.61.1-14.el8_3.1.x86_64 1/4
Upgrading : curl-7.61.1-14.el8_3.1.x86_64 2/4
Cleanup : curl-7.61.1-14.el8.x86_64 3/4
Cleanup : libcurl-minimal-7.61.1-14.el8.x86_64 4/4
Running scriptlet: libcurl-minimal-7.61.1-14.el8.x86_64 4/4
Verifying : curl-7.61.1-14.el8_3.1.x86_64 1/4
Verifying : curl-7.61.1-14.el8.x86_64 2/4
Verifying : libcurl-minimal-7.61.1-14.el8_3.1.x86_64 3/4
Verifying : libcurl-minimal-7.61.1-14.el8.x86_64 4/4
Upgraded:
curl-7.61.1-14.el8_3.1.x86_64 libcurl-minimal-7.61.1-14.el8_3.1.x86_64
Complete!
Removing intermediate container 449caac34afb
---> 5dc4967f28f7
Step 3/3 : CMD [ "curl","-s","http://ip.cn" ]
---> Running in 0c1f550713a0
Removing intermediate container 0c1f550713a0
---> 1bd4f1f4b319
Successfully built 1bd4f1f4b319
Successfully tagged myip:latest
[root@izuf6d7j6gct081hm8qivez ~]#
查看构建好的镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker images myip
REPOSITORY TAG IMAGE ID CREATED SIZE
myip latest 1bd4f1f4b319 About a minute ago 243MB
运行时报错
[root@izuf6d7j6gct081hm8qivez ~]# docker run myip -i
docker: Error response from daemon: OCI runtime create failed: container_linux.go:370: starting container process caused: exec: "-i": executable file not found in $PATH: unknown.
why
我们可以看到可执行文件找不到的报错，executable file not found。
之前我们说过，跟在镜像名后边的是command，运行时会替换CMD的默认值。
因此我们这里边的-i 替换了原来的CMD，而不是添加在原来的curl -s http://ip.cn后边。而-i 根本不是命令，所以自然找不到。
那么如果我们希望加入 -i 这个参数，我们就必须重新完整的输入这个命令：
$ docker run myip curl -s http://ip.cn -i
制作ENTRYPOINT版查询IP信息容器
[root@izuf6d7j6gct081hm8qivez ~]# vim DockerFile2
FROM centos
RUN yum install -y curl
ENTRYPOINT [ "curl","-s","http://ip.cn" ]
构建
[root@izuf6d7j6gct081hm8qivez ~]# docker build -f /root/DockerFile3 -t myip3 .
Sending build context to Docker daemon 720.4MB
Step 1/3 : FROM centos
---> 300e315adb2f
Step 2/3 : RUN yum install -y curl
---> Using cache
---> 5dc4967f28f7
Step 3/3 : ENTRYPOINT [ "curl","-s","http://ip.cn" ]
---> Running in 00b908f11d53
Removing intermediate container 00b908f11d53
---> d40be39fb652
Successfully built d40be39fb652
Successfully tagged myip3:latest
[root@izuf6d7j6gct081hm8qivez ~]# ^C
[root@izuf6d7j6gct081hm8qivez ~]# ^C
[root@izuf6d7j6gct081hm8qivez ~]# cat DockerFile3
FROM centos
RUN yum install -y curl
ENTRYPOINT [ "curl","-s","http://ip.cn" ]
[root@izuf6d7j6gct081hm8qivez ~]#
运行
# 在运行该命令就不会报错了，因为CMD是替换，而ENTRYPOINT是追加
[root@izuf6d7j6gct081hm8qivez ~]# docker run myip3 -i
HTTP/1.1 301 Moved Permanently
Date: Tue, 02 Feb 2021 03:41:05 GMT
Transfer-Encoding: chunked
Connection: keep-alive
Cache-Control: max-age=3600
Expires: Tue, 02 Feb 2021 04:41:05 GMT
Location: https://ip.cn/
cf-request-id: 08026d70d70000368a27841000000001
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report?s=bAsjdq9x3nHvmVI0vwCVgiPTcG3NXSTy2rUIMGpVR9s8oSX6b2VO%2Fa1fxgG56s1HzpDTi6Uc05AodFZwUMFcLvAYceEG2Q%3D%3D"}],"group":"cf-nel","max_age":604800}
NEL: {"report_to":"cf-nel","max_age":604800}
Server: cloudflare
CF-RAY: 61b0e4fafd45368a-LAX
alt-svc: h3-27=":443"; ma=86400, h3-28=":443"; ma=86400, h3-29=":443"; ma=86400
[root@izuf6d7j6gct081hm8qivez ~]#
案例3
自定义镜像 Tomcat9
[root@izuf6d7j6gct081hm8qivez /]# mkdir -p /zzyyuse/mydockerfile/tomcat9
[root@izuf6d7j6gct081hm8qivez /]# touch c.txt
[root@izuf6d7j6gct081hm8qivez /]# vim Dockerfile
FROM centos
MAINTAINER gxy<1024379557@qq.com>
#把宿主机当前上下文的c.txt拷贝到容器/usr/local/路径下
COPY c.txt /usr/local/cincontainer.txt
#把java与tomcat添加到容器中
ADD jdk-8u251-linux-x64.tar.gz /usr/local/
ADD apache-tomcat-9.0.41.tar.gz /usr/local/
#安装vim编辑器
RUN yum -y install vim
#设置工作访问时候的workdir路径，登录落脚点
ENV MYPATH /usr/local
WORKDIR $MYPATH
#配置java与tomcat环境变量
ENV JAVA_HOME /usr/local/jdk1.8.0_191
ENV CLASSPATH $JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
ENV CATALINA_HOME /usr/local/apache-tomcat-9.0.41
ENV CATALINA_BASE /usr/local/apache-tomcat-9.0.41
ENV PATH $PATH:$JAVA_HOME/bin:$CATALINA_HOME/lib:$CATALINA_HOME/bin
#容器运行时监听的端口
EXPOSE 8080
#启动时运行tomcat
# ENTRYPOINT ["/usr/local/apache-tomcat-9.0.41/bin/startup.sh"]
# CMD ["/usr/local/apache-tomcat-9.0.41/bin/catalina.sh","run"]
CMD /usr/local/apache-tomcat-9.0.41/bin/startup.sh && tail -F /usr/local/apache-tomcat-9.0.41/bin/logs/catalina.out
构建
[root@izuf6d7j6gct081hm8qivez tomcat9]# ll
总用量 201740
-rw-r--r-- 1 root root 11442169 2月 2 16:59 apache-tomcat-9.0.41.tar.gz
-rw-r--r-- 1 root root 0 2月 2 14:40 c.txt
-rw-r--r-- 1 root root 1032 2月 2 18:26 Dockerfile
-rw-r--r-- 1 root root 195132576 2月 2 17:02 jdk-8u251-linux-x64.tar.gz
[root@izuf6d7j6gct081hm8qivez tomcat9]# docker build -f Dockerfile -t zzyytomcat9 .
Sending build context to Docker daemon 206.6MB
Step 1/15 : FROM centos
---> 300e315adb2f
Step 2/15 : MAINTAINER gxy<1024379557@qq.com>
---> Running in 1fe1b230c056
....
Removing intermediate container de7c0f8a1dc7
---> a57fd7cbc95b
Successfully built a57fd7cbc95b
Successfully tagged zzyytomcat9:latest
[root@izuf6d7j6gct081hm8qivez tomcat9]#
构建成功
查看当前构建的镜像
[root@izuf6d7j6gct081hm8qivez tomcat9]# docker images zzyytomcat9
REPOSITORY TAG IMAGE ID CREATED SIZE
zzyytomcat9 latest a57fd7cbc95b 5 minutes ago 689MB
根据zzyytomcat9跑一个容器实例
# -d 后台运行 -p 映射端口 -v 添加容器卷 此次一共添加了两个容器卷 --privileged=true 给容器目录写权限打开
[root@izuf6d7j6gct081hm8qivez ~]# docker run -d -p 9080:8080 --name myt9 -v /zzyyuse/mydockerfile/tomcat9/test:/usr/local/apache-tomcat9.0.41/webapps/test -v /zzyyuse/mydockerfile/tomcat9/tomcat9logs/:/usr/local/apache-tomcat9.0.41/logs --privileged=true zzyytomcat9
601511a2f10b1685783dcf20a08fd143e50d4dd27f28b6a64e49cd391fe0772c
[root@izuf6d7j6gct081hm8qivez ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
601511a2f10b zzyytomcat9 "/bin/sh -c '/usr/lo…" 12 seconds ago Up 11 seconds 0.0.0.0:9080->8080/tcp myt9
[root@izuf6d7j6gct081hm8qivez ~]# docker exec 601511a2f10b ls -l
total 56
drwxr-xr-x 1 root root 4096 Feb 2 10:31 apache-tomcat-9.0.41
drwxr-xr-x 4 root root 4096 Feb 3 03:23 apache-tomcat9.0.41
drwxr-xr-x 2 root root 4096 Nov 3 15:22 bin
-rw-r--r-- 1 root root 0 Feb 2 06:40 cincontainer.txt
drwxr-xr-x 2 root root 4096 Nov 3 15:22 etc
drwxr-xr-x 2 root root 4096 Nov 3 15:22 games
drwxr-xr-x 2 root root 4096 Nov 3 15:22 include
drwxr-xr-x 7 10143 10143 4096 Mar 12 2020 jdk1.8.0_251
drwxr-xr-x 2 root root 4096 Nov 3 15:22 lib
drwxr-xr-x 3 root root 4096 Dec 4 17:37 lib64
drwxr-xr-x 2 root root 4096 Nov 3 15:22 libexec
drwxr-xr-x 2 root root 4096 Nov 3 15:22 sbin
drwxr-xr-x 5 root root 4096 Dec 4 17:37 share
drwxr-xr-x 2 root root 4096 Nov 3 15:22 src
安装mysql
步骤：
1. docker hub上面查找mysql镜像
2. 从docker hub上（阿里云加速器）拉取mysql镜像到本地标签为5.6
3. 使用mysql5.6镜像创建容器（也就运行镜像）
1.从docker hub上面查找mysql镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker search mysql
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
mysql MySQL is a widely used, open-source relation… 10455 [OK]
mariadb MariaDB is a community-developed fork of MyS… 3886 [OK]
mysql/mysql-server Optimized MySQL Server Docker images. Create… 767 [OK]
percona Percona Server is a fork of the MySQL relati… 526 [OK]
centos/mysql-57-centos7 MySQL 5.7 SQL database server 87
mysql/mysql-cluster Experimental MySQL Cluster Docker images. Cr… 79
centurylink/mysql Image containing mysql. Optimized to be link… 59 [OK]
bitnami/mysql Bitnami MySQL Docker Image 48 [OK]
deitch/mysql-backup REPLACED! Please use http://hub.docker.com/r… 41 [OK]
databack/mysql-backup Back up mysql databases to... anywhere! 37
prom/mysqld-exporter 37 [OK]
tutum/mysql Base docker image to run a MySQL database se… 35
schickling/mysql-backup-s3 Backup MySQL to S3 (supports periodic backup… 29 [OK]
linuxserver/mysql A Mysql container, brought to you by LinuxSe… 27
centos/mysql-56-centos7 MySQL 5.6 SQL database server 20
circleci/mysql MySQL is a widely used, open-source relation… 20
arey/mysql-client Run a MySQL client from a docker container 17 [OK]
mysql/mysql-router MySQL Router provides transparent routing be… 17
fradelg/mysql-cron-backup MySQL/MariaDB database backup using cron tas… 11 [OK]
yloeffler/mysql-backup This image runs mysqldump to backup data usi… 7 [OK]
openshift/mysql-55-centos7 DEPRECATED: A Centos7 based MySQL v5.5 image… 6
devilbox/mysql Retagged MySQL, MariaDB and PerconaDB offici… 3
ansibleplaybookbundle/mysql-apb An APB which deploys RHSCL MySQL 2 [OK]
jelastic/mysql An image of the MySQL database server mainta… 1
widdpim/mysql-client Dockerized MySQL Client (5.7) including Curl… 1 [OK]
2.从docker hub上面拉取镜像到本地
[root@izuf6d7j6gct081hm8qivez ~]# docker pull mysql:5.6
5.6: Pulling from library/mysql
8aff230071c9: Pull complete
134fc34c9927: Pull complete
27dfb473d52e: Pull complete
702c333a167e: Pull complete
699bc078b452: Pull complete
01dd862365bd: Pull complete
7dbfc4425b5a: Pull complete
038f3579b073: Pull complete
d03e96fd56ed: Pull complete
d4e40c94cc3e: Pull complete
552099682f91: Pull complete
Digest: sha256:a1868bd2d1c8c32a46baa7d06f38c3de76e949c8f811a5bc42bac6738520f3a7
Status: Downloaded newer image for mysql:5.6
docker.io/library/mysql:5.6
# 查询是否成功拉取到mysql镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker images mysql:5.6
REPOSITORY TAG IMAGE ID CREATED SIZE
mysql 5.6 eb4e842271a4 2 weeks ago 303MB
3.使用mysql5.6镜像创建容器（也就运行镜像）
[root@izuf6d7j6gct081hm8qivez ~]# docker run -p 12345:3306 --name mysql -v /zzyyuse/mysql/conf:/etc/mysql/conf.d -v /zzyyuse/mysql/logs:/logs -v /zzyyuse/mysql/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 -d mysql:5.6
226634c8ea479c162724684c569483c72678d95d732cac58623cc0b64d2bf3ca
命令说明：
-p123456:3306 将主机的12345端口映射到docker容器的3306端口。
--name mysql: 运行服务名字，也就是别名
-v /zzyyuse/mysql/conf:/etc/mysql/conf.d将主机/zzyyuse/mysql目录下的conf/my.cnf挂载到容器的/etc/mysql/conf.d
-v /zzyyuse/mysql/logs:/logs: 将主机/zzyyuse/mysql目录下的logs目录挂载到容器的/logs
-v /zzyyuse/mysql/data:/var/lib/mysql:将主机/zzyyuse/mysql目录下的data目录挂载到容器的/var/lib/mysql
-e MYSQL_ROOT_PASSWORD=123456:初始化root用户的密码
-d mysql:5.6 后台程序运行mysql5.6
# 查看运行的镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
226634c8ea47 mysql:5.6 "docker-entrypoint.s…" 17 seconds ago Up 15 seconds 0.0.0.0:12345->3306/tcp mysql
# 进入容器
[root@izuf6d7j6gct081hm8qivez ~]# docker exec -it 226634c8ea47 /bin/bash
root@226634c8ea47:/#
#进入mysql数据库
root@226634c8ea47:/# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.51 MySQL Community Server (GPL)
Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
+--------------------+
3 rows in set (0.01 sec)
mysql>
# 创建数据库db01
mysql> create database db01;
Query OK, 1 row affected (0.00 sec)
mysql> use db01;
Database changed
# 创建t_book表
mysql> create table t_book(id int not null primary key,bookName varchar(20));
Query OK, 0 rows affected (0.03 sec)
mysql> show tables;
+----------------+
| Tables_in_db01 |
+----------------+
| t_book |
+----------------+
1 row in set (0.00 sec)
mysql>
# 插入数据库测试字段
mysql> insert into t_book values(1,'java');
Query OK, 1 row affected (0.01 sec)
mysql> select * from t_book;
+----+----------+
| id | bookName |
+----+----------+
| 1 | java |
+----+----------+
1 row in set (0.00 sec)
mysql>
通过宿主机的数据库连接工具连接到容器的数据后进行增删改查，对应容器中的数据也会发响应的变化
安装redis
- 从docker hub上（阿里云加速）拉取redis镜像到本地标签为3.2
- 使用redis3.2镜像创建容器（也就运行容器）
拉取镜像
# 拉取redis镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker stop 226634c8ea47
226634c8ea47
[root@izuf6d7j6gct081hm8qivez ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[root@izuf6d7j6gct081hm8qivez ~]# docker pull redis:3.2
3.2: Pulling from library/redis
f17d81b4b692: Pull complete
b32474098757: Pull complete
8980cabe8bc2: Pull complete
58af19693e78: Pull complete
a977782cf22d: Pull complete
9c1e268980b7: Pull complete
Digest: sha256:7b0a40301bc1567205e6461c5bf94c38e1e1ad0169709e49132cafc47f6b51f3
Status: Downloaded newer image for redis:3.2
docker.io/library/redis:3.2
# 查看拉取到redis镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker images redis:3.2
REPOSITORY TAG IMAGE ID CREATED SIZE
redis 3.2 87856cc39862 2 years ago 76MB
运行镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker run -p 6389:6379 -v /zzyyuse/myredis/data:/data -v /zzyyuse/myredis/conf/redis.conf:/usr/local/etc/redis/redis.conf -d redis:3.2 redis-server /usr/local/etc/redis/redis.conf --appendonly yes
cbdc019dc08b94be0a15f38c9a3a07e860cf5a1e677c15a39fb52505d167316a
# 查看redis是在运行
[root@izuf6d7j6gct081hm8qivez ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cbdc019dc08b redis:3.2 "docker-entrypoint.s…" 17 seconds ago Up 15 seconds 0.0.0.0:6389->6379/tcp hopeful_shockley
创建redis配置文件
# 将redis的配置文件写入到redis.conf
[root@izuf6d7j6gct081hm8qivez redis.conf]# vim redis.conf
[root@izuf6d7j6gct081hm8qivez redis.conf]# pwd
/zzyyuse/myredis/conf/redis.conf
测试连接redis
[root@izuf6d7j6gct081hm8qivez redis.conf]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cbdc019dc08b redis:3.2 "docker-entrypoint.s…" 14 minutes ago Up 14 minutes 0.0.0.0:6389->6379/tcp hopeful_shockley
[root@izuf6d7j6gct081hm8qivez redis.conf]# docker exec -it cbdc019d redis-cli
127.0.0.1:6379>
# 创建测试数据
[root@izuf6d7j6gct081hm8qivez redis.conf]# docker exec -it cbdc019d redis-cli
127.0.0.1:6379> set key1 v1
OK
127.0.0.1:6379> set key2 v2
OK
127.0.0.1:6379> set key3 v3
OK
127.0.0.1:6379>
到宿主机上查看数据是否持久化
[root@izuf6d7j6gct081hm8qivez redis.conf]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
cbdc019dc08b redis:3.2 "docker-entrypoint.s…" 19 minutes ago Up 19 minutes 0.0.0.0:6389->6379/tcp hopeful_shockley
# 将服务停掉
[root@izuf6d7j6gct081hm8qivez redis.conf]# docker stop cbdc019dc08b
cbdc019dc08b
[root@izuf6d7j6gct081hm8qivez redis.conf]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[root@izuf6d7j6gct081hm8qivez data]# cd /zzyyuse/myredis/data
[root@izuf6d7j6gct081hm8qivez data]# pwd
/zzyyuse/myredis/data
[root@izuf6d7j6gct081hm8qivez data]# ll
-rw-r--r-- 1 systemd-bus-proxy ssh_keys 116 2月 3 16:50 appendonly.aof
[root@izuf6d7j6gct081hm8qivez data]# cat appendonly.aof
*2
$6
SELECT
$1
0
*3
$3
set
$4
key1
$2
v1
*3
$3
set
$4
key2
$2
v2
*3
$3
set
$4
key3
$2
v3
# 可以看到数据已经持久化了，此时的redis已经是关闭了
本地镜像发布到阿里云
- 本地镜像发布到阿里云路流程
- 镜像的生产方法
- 将本地镜像推送到阿里云
- 将阿里云的镜像下载到本地
先构建本地镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker commit -a gxy -m "new mycentos1.4 with vim and ifconfig" 15d11191193a mycentos:1.4
sha256:5dfb533c7867c8a46a009613b660e220b0eee0ff298d5ba910cfbf75a52d6bea
OPTIONS说明：
-a：提交镜像作者；
-m：提交时的说明文字；
# 查看构建好的镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker images mycentos:1.4
REPOSITORY TAG IMAGE ID CREATED SIZE
mycentos 1.4 5dfb533c7867 40 seconds ago 291MB
将镜像推到registry
$ sudo docker login --username=guoxuyang1991 registry.cn-hangzhou.aliyuncs.com
$ sudo docker tag [ImageId] registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021:[镜像版本号]
$ sudo docker push registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021:[镜像版本号]
# 登录到registry
[root@izuf6d7j6gct081hm8qivez ~]# docker login --username=guoxuyang1991 registry.cn-hangzhou.aliyuncs.com
Password:
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store
Login Succeeded
[root@izuf6d7j6gct081hm8qivez ~]#
# 选择要上传的镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker images mycentos:1.4
REPOSITORY TAG IMAGE ID CREATED SIZE
mycentos 1.4 5dfb533c7867 17 hours ago 291MB
[root@izuf6d7j6gct081hm8qivez ~]# docker tag 5dfb533c7867 registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021:1.4
[root@izuf6d7j6gct081hm8qivez ~]#
# 从本地推送到阿里云服务器
[root@izuf6d7j6gct081hm8qivez ~]# docker push registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021:1.4
The push refers to repository [registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021]
edebd4d0d50c: Pushed
8053f652c9e1: Pushed
2653d992f4ef: Pushed
1.4: digest: sha256:c3a1a85140e6c616b01436f524a4f8e1e76e3d947a69aea21ebcff3ab1e81932 size: 953
[root@izuf6d7j6gct081hm8qivez ~]#
#查看镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
mycentos 1.4 5dfb533c7867 17 hours ago 291MB
registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021 1.4 5dfb533c7867 17 hours ago 291MB
zzyytomcat9 latest a57fd7cbc95b 40 hours ago 689MB
myip3 latest d40be39fb652 47 hours ago 243MB
myip latest 1bd4f1f4b319 2 days ago 243MB
mycentos 1.3 51e3e67533a3 2 days ago 291MB
tomcat latest 66d886628b2a 2 days ago 668MB
gxy/centos latest 442d7713764e 5 days ago 209MB
mysql 5.6 eb4e842271a4 2 weeks ago 303MB
centos latest 300e315adb2f 8 weeks ago 209MB
redis 3.2 87856cc39862 2 years ago 76MB
从私有仓库拉上传后的镜像到本地
# 删除上传的镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
mycentos 1.4 5dfb533c7867 17 hours ago 291MB
registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021 1.4 5dfb533c7867 17 hours ago 291MB
zzyytomcat9 latest a57fd7cbc95b 40 hours ago 689MB
myip3 latest d40be39fb652 47 hours ago 243MB
myip latest 1bd4f1f4b319 2 days ago 243MB
mycentos 1.3 51e3e67533a3 2 days ago 291MB
tomcat latest 66d886628b2a 2 days ago 668MB
gxy/centos latest 442d7713764e 5 days ago 209MB
mysql 5.6 eb4e842271a4 2 weeks ago 303MB
centos latest 300e315adb2f 8 weeks ago 209MB
redis 3.2 87856cc39862 2 years ago 76MB
[root@izuf6d7j6gct081hm8qivez ~]# docker rmi registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021:1.4
Untagged: registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021:1.4
Untagged: registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021@sha256:c3a1a85140e6c616b01436f524a4f8e1e76e3d947a69aea21ebcff3ab1e81932
# 查看当前镜像
[root@izuf6d7j6gct081hm8qivez ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
mycentos 1.4 5dfb533c7867 18 hours ago 291MB
zzyytomcat9 latest a57fd7cbc95b 41 hours ago 689MB
myip3 latest d40be39fb652 2 days ago 243MB
myip latest 1bd4f1f4b319 2 days ago 243MB
mycentos 1.3 51e3e67533a3 2 days ago 291MB
tomcat latest 66d886628b2a 2 days ago 668MB
gxy/centos latest 442d7713764e 6 days ago 209MB
mysql 5.6 eb4e842271a4 2 weeks ago 303MB
centos latest 300e315adb2f 8 weeks ago 209MB
redis 3.2 87856cc39862 2 years ago 76MB
# 从私有仓库拉取镜像到本地
[root@izuf6d7j6gct081hm8qivez ~]# sudo docker pull registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021:1.4
1.4: Pulling from gxy_docker2021/gxy_docker_2021
Digest: sha256:c3a1a85140e6c616b01436f524a4f8e1e76e3d947a69aea21ebcff3ab1e81932
Status: Downloaded newer image for registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021:1.4
registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021:1.4
[root@izuf6d7j6gct081hm8qivez ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
mycentos 1.4 5dfb533c7867 18 hours ago 291MB
registry.cn-hangzhou.aliyuncs.com/gxy_docker2021/gxy_docker_2021 1.4 5dfb533c7867 18 hours ago 291MB
zzyytomcat9 latest a57fd7cbc95b 41 hours ago 689MB
myip3 latest d40be39fb652 2 days ago 243MB
myip latest 1bd4f1f4b319 2 days ago 243MB
mycentos 1.3 51e3e67533a3 2 days ago 291MB
tomcat latest 66d886628b2a 2 days ago 668MB
gxy/centos latest 442d7713764e 6 days ago 209MB
mysql 5.6 eb4e842271a4 2 weeks ago 303MB
centos latest 300e315adb2f 8 weeks ago 209MB
redis 3.2 87856cc39862 2 years ago 76MB
docker的内存分配机制
如何查看centos中docker的内存分配参数
在 CentOS 中，你可以使用 docker inspect 命令来查看一个运行中容器的详细信息，包括其内存分配参数。
通过docker ps来获取容器ID
[root@VM-4-14-centos ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
56568a01a220 tomcat "catalina.sh run" 3 minutes ago Up 3 minutes 0.0.0.0:8080->8080/tcp, :::8080->8080/tcp my_tomcat
查看内存分配参数
# 返回值为0，通常意味着该容器没有设置具体的内存限制，或者它可能继承了默认的内存限制。如果一个容器没有显式设置内存限制，那么它将会使用系统的默认限制，这通常是无限制的，意味着容器可以使用主机上所有可用的内存。所以，返回0可能意味着该容器可以使用主机上的所有可用内存，没有受到具体的内存限制。
[root@VM-4-14-centos ~]# docker inspect --format='{{.HostConfig.Memory}}' 56568a01a220
0
这将会返回容器的内存限制，单位为字节。
如果你想获取内存限制的其他格式，可以替换 {{.HostConfig.Memory}} 部分，比如 {{.HostConfig.Memory}} 可以替换成 {{.HostConfig.Memory}} / 1024 / 1024 以获取以兆字节为单位的内存限制。
请确保容器正在运行以及你有相应的权限来运行 Docker 命令。如果容器已经停止，你可能需要重新启动它以查看其内存配置。
**声明：**本笔记是根据尚硅谷视频所做笔记，有侵权者可联系本人给予删除！
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