Install docker offline under linux system

1. Environment description: In some deployment environments, online deployment is not possible due to network or other reasons. At this time, docker needs to be installed offline;

2. Installation steps:

1. Get the docker installation file, the official address is as follows:

https://download.docker.com/linux/static/stable/x86_64/docker-19.03.9.tgz

2. Unzip the downloaded installation file, the command is as follows:

tar zxvf docker-19.03.9.tgz

3. Move all the files (docker folder) after decompression to the /usr/bin directory (required), the command is as follows:

cp -p docker/* /usr/bin

4. Register docker as a service, the steps are as follows:

①Enter the following command:

vi /usr/lib/systemd/system/docker.service

②Click i, the following appears -----insert---- enter the editing state

Copy the following content to docker.service, copy the content as follows:

[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=network.target docker.socket
[Service]
Type=notify
EnvironmentFile=-/run/flannel/docker
WorkingDirectory=/usr/local/bin
ExecStart=/usr/bin/dockerd \
                -H tcp://0.0.0.0:4243 \
                -H unix:///var/run/docker.sock \
                --selinux-enabled=false \
                --log-opt max-size=1g
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=on-failure
[Install]
WantedBy=multi-user.target

After copying is complete, click the esc key, and enter: wq! to save and force exit;

Execute the following command to check whether the above copied content is correct

cat /usr/lib/systemd/system/docker.service

5. Reload the docker configuration file, the command is as follows:

$ systemctl daemon-reload

6. Start docker, the command is as follows:

$ systemctl start docker

7. Set docker to start up, the command is as follows:

$ systemctl enable docker

8. Check whether the docker is installed successfully, the command is as follows:

$ docker version