一、安装 docker

1. 下载 Docker 安装包

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

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