To avoid this, you can follow below procedure to allow non-root users to run Docker containers.Ĭreate a group called docker if it does not exist, run the following commands with root privileges. Allow Non-root accessĪs you can see in my command, for CentOS, I had to run Docker as a root user. Once the image has been downloaded, it will start the container and echo the command Hello-World in the console which you can see at the end of the output. Status: Downloaded newer image for centos:latestĭocker looks for centos image locally, and it is not found, it starts downloading the centos image from Docker registry. Docker starts a container with centos base image since we are running this centos container for the first time, the output will look like below. Let’s see what happens when we run the docker run command. Once the service is started, verify your installation by running the following command. Systemctl enable docker Verify Docker Installation Now you have Docker installed onto your machine, start the Docker service in case if it is not started automatically after the installation systemctl start docker You can list the Docker versions available with yum list docker-ce –showduplicates | sort -r Install Docker from Base Repositoryĭocker is available in the standard repository of CentOS, so we don’t have to search for the package.įor RHEL 7, you must have a valid Redhat subscription to enable Extras rpm’s repository on the server. Sometime you may want to install particular version of Docker, you can do that by appending version like docker-ce. yum -y remove docker-common docker container-selinux docker-selinux docker-engineĭo not worry about the contents inside /var/lib/docker/, all will be preserved. Uninstall older versions of Dockers, named docker or docker-engine along with associated dependencies. Here, we will install Docker Comunity Edition (CE). Install DockerĬhoose any one of the methods to install Docker on CentOS 7. In this post, you will learn how to install Docker on CentOS 7 / RHEL 7. With Docker, the applications reside inside the container on top of the Linux operating system.ĭocker uses Kernel features such as cgroups and namespace to allow an independent container to run on single os instance. Docker is a container virtualization technology that has gained widespread popularity in recent times it offers a more efficient way to deploy the application.
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