一、環境
因某些環境，不能聯外網，所以使用docker yum源方法行不通，於是打算離線安裝
環境：contos7.3(內核需爲3.10+)
cat /etc/redhat-release
# CentOS Linux release 7.3.1611 (Core)
二、安裝步驟
1）setup
cd /usr/local/resource/docker
tar -xzvf docker-18.06.3-ce.tar
mv /usr/local/resource/docker/docker/* /usr/bin/ # 將二進制文件移動到bin下2）systemd docker.service
vim /etc/systemd/system/docker.service然後將以下內容粘貼進去：
[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授予執行權限：
chmod +x /etc/systemd/system/docker.service然後：
systemctl daemon-reload # 重載systemd下 xxx.service文件
systemctl start docker # 啓動Docker
systemctl enable docker.service # 設置開機自啓測試是否成功：
systemctl status docker # 查看Docker狀態
docker -v # 查看Docker版本