一、CentOS 7
1、下载docker安装包：Index of linux/static/stable/x86_64/
2、将安装包随便放到系统某个目录下解压：tar -xvf docker-20.10.8.tgz
3、将解压后的docker目录中的所有内容拷贝到/usr/bin/目录下，放到此目录下相当于配置了环境变量即可以使用docker命令。（注：此处拷贝的内容不是整个docker目录而是docker目录下的所有文件）
4、将docker注册为service：vim /etc/systemd/system/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 --selinux-enabled=false --insecure-registry=127.0.0.1
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.target5、保存后给docker.service文件添加权限：chmod +x /etc/systemd/system/docker.service
6、重新加载配置文件（修改docker.service文件时都要重新加载下）：systemctl daemon-reload
7、启动docker：systemctl start docker
8、设置开机启动：systemctl enable docker.service
9、查看docker状态：systemctl status docker
10、查看docker版本：docker -v
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