一、安装 docker
1. 下载 Docker 安装包
2. 解压安装包
tar -xvf docker-27.1.0.tgz
mv docker/* /usr/bin/
3. 将 docker 注册为 service 服务
vim /etc/systemd/system/docker.service
docker.service
[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
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
4. 启动docker
chmod +x /etc/systemd/system/docker.service
systemctl daemon-reload
systemctl start docker
5. 查看版本号
systemctl status docker
docker -v
6. 设置开机自启
systemctl enable docker.service
二、镜像保存和加载
1. 保存镜像
docker save -o 镜像保存的名字和位置 镜像名:TAG
docker save -o nginx.tar nginx:latest
2. 加载镜像
docker load -i 镜像保存的名字和位置
docker load -i nginx.tar
