Installing docker
1. Set up the repository
Install packages to allow apt to use a repository over HTTPS:
`$ sudo apt-get install apt-transport-https ca-certificates curl software-properties-common`
Add Docker’s official GPG key:
`$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -`
Add the Docker repository to APT sources:
`$ sudo add-apt-repository “deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable”`
Next, update the package database with the Docker packages from the newly added repo:
`$ sudo apt-get update`
2. Install Docker Community Edition(CE).
Update the apt package index.
`$ sudo apt-get update`
Install the latest version of Docker CE
`$ sudo apt-get -y install docker-ce`
Docker should now be installed, the daemon started, and the process enabled to start on boot. Check that it’s running:
`$ sudo systemctl status docker`
Verify that Docker CE is installed correctly by running the hello-world image.
`$ sudo docker run hello-world`
Executing Docker without sudo
If you want to avoid typing sudo whenever you run the docker command, add your user to the docker group:
`$ sudo usermod -aG docker ${USER}`
To apply the new group membership, you can log out of the server and back in, or you can type the following:
`$ su — ${USER}`
You will be prompted to enter your user’s password to continue. Afterwards, you can confirm that your user is now added to the docker group by typing:
`$ id -nG`
Installing docker-compose
Run this command to download the Docker Compose version 1.17:
`$ sudo curl -L https://github.com/docker/compose/releases/download/1.17.0/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose`
Apply executable permissions to the binary:
`$ sudo chmod +x /usr/local/bin/docker-compose`
Test the installation.
`$ docker-compose — version`
