For ones, who want to build and run Docker containers on CentOS-7 – first of all it is required to install Docker itself.
To install the latest version of Docker and to be able to upgrade it easily in future – it is recommended to install Docker from the official repository.
In this guide i will show how to install free Docker CE (Community Edition) on CentOS-7 from the stable official repository, how to verify that it is installed correctly and will show the common post-installation steps to perform.
Requirements: To install Docker on CentOS-7 – you must have 64-bit architecture and Linux kernel version 3.10 or higher. You can check if your system matches the requirements with the arch and uname -r commands.
Install Docker on CentOS-7
Set up the stable Docker’s repository:
$ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
Install Docker:
$ sudo yum install docker-ce
Start Docker:
$ sudo systemctl start docker
Verify that Docker is installed correctly by running the hello-world image:
$ sudo docker run hello-world
Cool Tip: Docker successfully installed! It’s time to run first container! Read More →
Post-Installation Steps
First of all it is required to configure Docker daemon to start automatically at system boot.
Run the following command to add Docker to autostart:
$ sudo systemctl enable docker
And secondly, add your user to the docker group to get rid of the need of typing sudo each time you run the docker command:
$ sudo usermod -aG docker $USER
Info: Log out and log back to complete the group assignment.
To verify that you can run docker without sudo, execute:
$ docker run hello-world