About the problem of offline installation of Docker package on CentOS 8.4

The virtual machine used is CentOS 8.4, which simulates the server environment. It cannot connect to the external network and can only install software offline.

First, download the Docker installation package from the external network machine. Download address:

Index of linux/static/stable/x86_64/

https://download.docker.com/linux/static/stable/x86_64/

You can download the corresponding version according to your needs. I downloaded 20.10.8.

Unzip the file package:

tar zxvf docker-20.10.8.tgz

Get the docker folder and enter it, you can see the following files:

In order to make the docker command executable in any location, you need to move the above files to the system executable directory, such as the /usr/bin directory; or add the current directory to the environment variable. Here, we use the first method.

cp * /usr/bin/

Optionally, do not overwrite runc.

At this point, you can execute the docker command. The following command can view the docker version information.

Furthermore, in order to facilitate the management of docker, we need to configure the docker service. Create a docker.service file in the /etc/systemd/system directory. The content of the file is as follows:

[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

Add executable permissions to docker.service:

chmod +x /etc/systemd/system/docker.service

Reload the service configuration file:

systemctl daemon-reload

Restart Docker:

systemctl restart docker

Enable automatic startup:

systemctl enable docker

Check the docker status:

systemctl status docker 

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