How to Install and Uninstall Docker Offline on CentOS 7

When a CentOS 7 server cannot reach the internet, Docker must be installed from an offline package.

First, download the Docker static binaries from https://download.docker.com/linux/static/stable/x86_64/ and select version 20.10.7 . Transfer the docker-20.10.7.tgz file to the target server.

On the server, extract the archive: tar -zvxf docker-20.10.7.tgz Copy the extracted binaries to the system binary directory: cp docker/* /usr/bin/ Create a docker.service file with the following content:

[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
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

Copy the file to /etc/systemd/system/, make it executable, reload the systemd daemon, start Docker, and verify the version:

cp docker.service /etc/systemd/system/
chmod +x /etc/systemd/system/docker.service
systemctl daemon-reload
systemctl start docker
docker version

To uninstall Docker, stop the service, remove the service file and binaries, and reload the daemon:

systemctl stop docker
rm -f /etc/systemd/system/docker.service
rm -rf /usr/bin/docker*
systemctl daemon-reload