背景介紹
項目開發過程中，客戶環境大多是全內網環境，無法連接互聯網。這樣docker就不能yum在線聯網安裝，所需要的鏡像也不能在線pull下載。
這時就需要進行離線安裝docker及鏡像。
下載docker安裝文件
開始安裝
解壓：
tar -xvf docker-19.03.6.tar
cp 將解壓出來的docker文件內容移動到 /usr/bin/ 目錄下 ：
cp docker/* /usr/bin/
docker 注冊為服務
創建配置文件
vim /etc/systemd/system/docker.service
內容參考： 補充配置文件 docker.service
重啟 docker 服務
chmod +x /etc/systemd/system/docker.service #添加文件權限
systemctl daemon-reload #重載unit配置文件
systemctl start docker #啟動Docker
systemctl enable docker.service
注意：如果你的服務已經啟動，一定要先停止，否則啟動失敗，此時 systemctl start docker 無法停止，需要手動 kill掉
驗證是否注冊為服務
輸入命令，觀察效果
[root@host-10-227-50-187 system]# systemctl start docker
[root@host-10-227-50-187 system]# systemctl stop docker
[root@host-10-227-50-187 system]# docker ps
補充配置文件 docker.service
[root@host-10-227-50-187 system]# vim /etc/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
# BindsTo=containerd.service
# After=network-online.target firewalld.service containerd.service
After=network-online.target firewalld.service
Wants=network-online.target
# Requires=docker.socket
[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 fd:// --containerd=/run/containerd/containerd.sock
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
# Note that StartLimit* options were moved from "Service" to "Unit" in systemd 229.
# Both the old, and new location are accepted by systemd 229 and up, so using the old location
# to make them work for either version of systemd.
StartLimitBurst=3
# Note that StartLimitInterval was renamed to StartLimitIntervalSec in systemd 230.
# Both the old, and new name are accepted by systemd 230 and up, so using the old name to make
# this option work for either version of systemd.
StartLimitInterval=60s
# 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
# Comment TasksMax if your systemd version does not support it.
# Only systemd 226 and above support this option.
# TasksMax=infinity
# 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
[Install]
WantedBy=multi-user.target
~
~
~
~
~
"/etc/systemd/system/docker.service" 50L, 1767C 50,0-1 全部
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
# BindsTo=containerd.service
# After=network-online.target firewalld.service containerd.service
After=network-online.target firewalld.service
Wants=network-online.target
# Requires=docker.socket
[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 fd:// --containerd=/run/containerd/containerd.sock
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
# Note that StartLimit* options were moved from "Service" to "Unit" in systemd 229.
# Both the old, and new location are accepted by systemd 229 and up, so using the old location
# to make them work for either version of systemd.
StartLimitBurst=3
# Note that StartLimitInterval was renamed to StartLimitIntervalSec in systemd 230.
# Both the old, and new name are accepted by systemd 230 and up, so using the old name to make
# this option work for either version of systemd.
StartLimitInterval=60s
# 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
# Comment TasksMax if your systemd version does not support it.
# Only systemd 226 and above support this option.
# TasksMax=infinity
# 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
[Install]
WantedBy=multi-user.target