Docker installation - Ubuntu 20.04 LTS
Install on Ubuntu (easy way)
# install
sudo apt install -y docker.io docker-compose
# use Docker as a non-root user
# get rid of having to sudo or be root
sudo usermod -aG docker $(whoami)
# logout and login again for the group change to work
You don't need to install the long manual way, docker.io is already provided as a package in the Ubuntu repos and the version is fairly up to date (19.03.8-0ubuntu1 as of this writing, which is the latest version). You can check which version comes with the commandapt info docker.io
note that in Ubuntu docker is a tray plugin, while docker.io is the Docker containerization software. the name docker wasn't available so they went with docker.io
Install on Ubuntu (hard way)
Since i had already written this, i'm keeping the content. But the one-liner command above is good enough
# uninstall any existing docker
sudo apt-get remove docker docker-engine docker.io containerd runc
# enable https repos
sudo apt-get install -y apt-transport-https ca-certificates curl gnupg-agent software-properties-common
# Add Docker’s official GPG key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
# add repo
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
# install Docker
sudo apt-get update && sudo apt-get install -y docker-ce docker-ce-cli containerd.io
Since the release for 20.04 LTS is not available as of this writing, i'm adding the bionic repo instead ref. bionic instead of $(lsb_release -cs)
User permissions
If you keep getting permission denied errors like these
docker: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.40/containers/create: dial unix /var/run/docker.sock: connect: permission denied.
See 'docker run --help'.
This means you need to run the command with sudo. You can get rid of having to sudo by adding yourself to the docker user group
sudo usermod -aG docker $(whoami)
Make sure you logout and log back in after this in order for the change to work