Set up the repository
Update the apt package index and install packages to allow apt to use a repository over HTTPS:
$ sudo apt-get update
$ sudo apt-get install ca-certificates curl gnupg lsb-release
Add Docker’s official GPG key:
$ curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
Use the following command to set up the stable repository.
echo \ "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian \ $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
Install Docker Engine
Update the apt package index, and install the latest version of Docker Engine and containerd, or go to the next step to install a specific version:
$ sudo apt-get update $ sudo apt-get install docker-ce docker-ce-cli containerd.io
Verify that Docker Engine is installed correctly by running the hello-world image.
$ sudo docker run hello-world
Configure Docker to start on boot
$ sudo systemctl enable docker.service $ sudo systemctl enable containerd.service
Manage Docker as a non-root user
Create the docker group.
sudo groupadd docker
Add your user to the docker group.
sudo usermod -aG docker $USER
Log out and log back in so that your group membership is re-evaluated. If testing on a virtual machine, it may be necessary to restart the virtual machine for changes to take effect. On a desktop Linux environment such as X Windows, log out of your session completely and then log back in.
On Linux, you can also run the following command to activate the changes to groups:
newgrp docker
Verify that you can run docker commands without sudo.
$ docker run hello-world
This command downloads a test image and runs it in a container. When the container runs, it prints a message and exits.
Configuring remote access with systemd unit file
Use the command sudo systemctl edit docker.service to open an override file for docker.service in a text editor. Add or modify the following lines, substituting your own values.
[Service] ExecStart= ExecStart=/usr/bin/dockerd -H fd:// -H tcp://127.0.0.1:2375
Save the file. Reload the systemctl configuration.
sudo systemctl daemon-reload
Restart Docker.
sudo systemctl restart docker.service
Check to see whether the change was honored by reviewing the output of netstat to confirm dockerd is listening on the configured port.
$ sudo netstat -lntp | grep dockerd
Configuring remote access with daemon.json
Set the hosts array in the /etc/docker/daemon.json to connect to the UNIX socket and an IP address, as follows:
{
"hosts": ["unix:///var/run/docker.sock", "tcp://127.0.0.1:2375"]
}
Restart Docker. Check to see whether the change was honored by reviewing the output of netstat to confirm dockerd is listening on the configured port.
sudo netstat -lntp | grep dockerd
Ref:
https://docs.docker.com/engine/install/debian/
https://docs.docker.com/engine/install/linux-postinstall/