一、环境
因某些环境，不能联外网，所以使用docker yum源方法行不通，于是打算离线安装
环境：contos7.3(内核需为3.10+)
cat /etc/redhat-release
# CentOS Linux release 7.3.1611 (Core)
二、安装步骤
1）setup
cd /usr/local/resource/docker
tar -xzvf docker-18.06.3-ce.tar
mv /usr/local/resource/docker/docker/* /usr/bin/ # 将二进制文件移动到bin下2）systemd docker.service
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然后：
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