9. centos 离线安装docker

        因为工作需要，我需要离线安装一些东西，比如postgre、redis、nginx等，这些可以通过源码手工编译(在离线情况下可能不太方便)。更方便的是使用docker 镜像。想使用docker镜像的话，首先要安装docker环境，以下是安装docker环境的方法。
        因为是离线安装，我带了docker镜像来，不用远程下载镜像，所以第8,9步没有试过，其它的亲测可用，特此记录如下：

1. 下载docker
   https://download.docker.com/linux/static/stable/x86_64/

2. 解压缩
   tar xvf docker-24.0.5.tgz.tar
   解压后是一些可执行文件

3. 将解压的docker拷贝或移动到/usr/bin/目录下
   cp docker/* /usr/bin/
   /usr/bin下可能有一些可执行文件跟docker名称一样，我安装的时候就遇到了这种情况，我没用覆盖同名文件

4. 编写docker.service 文件加入Linux服务当中并开启守护进程
   vim /etc/systemd/system/docker.service
   文件内容如下：

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
  
[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd -H unix:///var/run/docker.sock --selinux-enabled=false --default-ulimit nofile=65536:65536
ExecReload=/bin/kill -s HUP $MAINPID
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
# Uncomment TasksMax if your systemd version supports it.
# Only systemd 226 and above support this version.
#TasksMax=infinity
TimeoutStartSec=0
# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
# restart the docker process if it exits prematurely
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
  
[Install]
WantedBy=multi-user.target

5. 添加文件可执行权限
   chmod +x /etc/systemd/system/docker.service

6. 配置成功后，重新加载 daemon 服务
   systemctl daemon-reload

7. 启动docker服务
   systemctl start docker

8. 解决镜像拉取失败问题

mkdir -p /etc/docker;
vi /etc/docker/daemon.json

文件内容

{
    "registry-mirrors":
    [
        "https://ustc-edu-cn.mirror.aliyuncs.com/",
        "https://ccr.ccs.tencentyun.com/",
        "https://docker.m.daocloud.io/"
    ]
}

9. 重启docker
   sudo systemctl daemon-reload #重启daemon进程
   sudo systemctl restart docker #重启docker

        整体步骤是在csdn的谋篇文章中看到的，但时间太长了，我实在记不起是哪篇文章了，感谢源作者分享，某天源作者看到了给我留言附上源地址，感谢！