Docker¶

All the services in the server will be run through Docker. We'll need to first install this.

Installation¶

To install Docker, simply run the following commands:

curl -fsSL https://get.docker.com -o get-docker.sh
sudo sh ./get-docker.sh

Once it's done, you can remove the downloaded script:

rm get-docker.sh

Permissions¶

We'll add the required permissions for our user into the docker group.

sudo groupadd docker
sudo gpasswd -a $USER docker

Finally, reboot the server for the changes to apply.

Networks¶

By default, Docker will support up to 30 networks, and since we're planning on setting up multiple services, this limit will become problematic.

In order to extend the number of networks, we will configure the daemon with the multiple subnets. For this, create the following file:

sudo nano /etc/docker/daemon.json

And paste the following text:

{
   "default-address-pools": [
        {
            "base":"172.17.0.0/12",
            "size":16
        },
        {
            "base":"192.168.0.0/16",
            "size":20
        },
        {
            "base":"10.99.0.0/16",
            "size":24
        }
    ]
}

Then finally, restart the Docker service:

sudo service docker restart