1、去官网下载docker 安装二进制包，选择适合自己的版本。这里下载的是docker-19.03.9.tgz，在centos7中安装（cento6无法使用，提示linux版本内核版本太低）

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

2、复制docker-19.03.9.tgz到服务器上，解压：tar xzvf docker-19.03.9.tgz

3、进入docker目录复制所有文件到/usr/bin目录下，目的/user/bin是环境变量目录，在路径下都可以运行docker命令

ls -l docker

cp docker/* /usr/bin/

[root@localhost local]# tar xvf docker-19.03.9.tgzdocker/docker/docker-initdocker/runcdocker/dockerdocker/docker-proxydocker/containerddocker/ctrdocker/dockerddocker/containerd-shim[root@localhost local]# ls -l dockertotal 195504-rwxr-xr-x. 1 lr lr 32751272 May 14 17:29 containerd-rwxr-xr-x. 1 lr lr  6012928 May 14 17:29 containerd-shim-rwxr-xr-x. 1 lr lr 18194536 May 14 17:29 ctr-rwxr-xr-x. 1 lr lr 61113382 May 14 17:29 docker-rwxr-xr-x. 1 lr lr 68874208 May 14 17:29 dockerd-rwxr-xr-x. 1 lr lr   708616 May 14 17:29 docker-init-rwxr-xr-x. 1 lr lr  2928514 May 14 17:29 docker-proxy-rwxr-xr-x. 1 lr lr  9600696 May 14 17:29 runc[root@localhost local]# mv docker/* /usr/bin/[root@localhost local]#

vim /etc/systemd/system/docker.service

添加文件内容：

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target

[Service]
Type=notify
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s

[Install]
WantedBy=multi-user.target

赋执行权限

chmod +x /etc/systemd/system/docker.service
systemctl daemon-reload 

#开机启动
systemctl enable docker.service
启动docker
systemctl start docker