1. 下载

到以下地址 下载最新版本的docker-..*.tgz，此时最新的版本是docker-26.1.3.tgz
https://download.docker.com/linux/static/stable/x86_64/

2. 安装

2.1. 上传文件到任意目录（如/root）

2.2. 将下载得文件上传到Linux系统后使用下面命令进行解压

tar -zxvf docker-26.1.3.tgz

2.3. 解压后使用下面命令将整个docker文件夹复制到/usr/bin/目录

cp docker/* /usr/bin/

2.4. 执行命令

[root@localhost ~]# docker -v
Docker version 26.1.3, build b72abbb

3. 设置开机自启动

整个docker已经安装完了，但是，这样当服务器重启后会需要手动启动docker服务，咱们要改成服务开机自启动。

3.1. 设置docker启动服务，新建启动服务文件

vim /etc/systemd/system/docker.service

然后将以下内容粘贴进去：

 [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 tcp://0.0.0.0:2375 -H unix://var/run/docker.sock

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 

授予执行权限：

chmod +x /etc/systemd/system/docker.service

systemctl daemon-reload   # 重载systemd下 xxx.service文件

systemctl start docker       # 启动Docker

systemctl enable docker.service   # 设置开机自启

测试是否成功：

systemctl status docker   # 查看Docker状态

docker -v # 查看Docker版本

执行完 docker ps命令后显示以下第3条内容就代表整个docker服务已经完全启动成功了，接下来就可以开始docker部署服务之旅

[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

参考资料：RedHat7离线安装docker