For those of you who didn’t know, Docker is an open-source tool that makes creating and managing Linux containers (LXC) easy. With Docker, the applications resides inside the container on top of the Linux operating system. Docker uses Kernel features such as groups and namespace to allow the independent containers to run on a single os instance.
This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple. I will show you through the step by step installation of Docker on CentOS 7.
Install Docker on CentOS 7
Step 1. First of all, make sure that all packages are up to date.
1 | yum-yupdate |
Step 2. Install Docker using YUM.
Docker is included by default in the CentOS-Extras repository. To install run the following command:
1 2 | yum-yinstalldocker yum-yinstalldevice-mapperdevice-mapper-eventdevice-mapper-libsdevice-mapper-event-libs |
Start and enable Docker service:
1 2 | systemctlstartdocker.service systemctlenabledocker.service |
And verify your work by checking the status of Docker:
1 | systemctlstatusdocker.service |
Step 3. Download a Docker Container.
Let’s begin using Docker, Download the centos Docker image:
1 | dockerpullcentos |
Verify CentOS images that have been fetched:
1 | dockerimagescentos |
Step 4. Run a Docker Container.
As we can see centos container has been started and we got the bash shell. In docker command, we have used options like ‘-i attaches stdin and stdout’ and ‘-t allocates a terminal or console’.
1 | dockerrun-i-tcentos/bin/bash |
Step 5. Configure FirewallD.
FirwallD in CentOS 7 can conflict with Docker, it is recommended to disable the service. Run the following command:
1 2 | systemctlstopfirewalld.service systemctldisablefirewalld.service |
Congratulations! You have successfully installed Docker. Thanks for using this tutorial for installing Docker on CentOS 7 system. For additional help or useful information, we recommend you to check the official Docker website.
