This tutorial will use public CentOS Fedora repositories, but you may also run through this tutorial using Red Hat Enterprise Linux: Users on the registry can share multiple repositories.ĭocker has official CentOS and Fedora repositories which they support: These layers are shared together in, what is called a repository. This registry service is free to use, as long as the images are public.Īs one builds images, they are made up of layers. The Docker project maintains a public registry server which hosts images they maintain, as well as images created by the community. One of the key advantages of using Docker is it's centralized image management server, called a Registry Server. Also, base Docker images are available for Red Hat Enterprise Linux (6 and 7), CentOS and Fedora. The Docker tooling (daemon and client) is available in Red Hat Enterprise Linux, CentOS, and Fedora. This tutorial will focus on integration with Red Hat technologies including CentOS and Red Hat Enterprise Linux. There is a lot to think about with a production deployment, and I suggest readying the Architecting Containers series if you are seriously considering a production deployment. The Docker tooling reached 1.0 in June, 2014 and with some precautions, can be used in production. However, they require more engineering work using either Bash scripting or running SystemD in the container.

I need a single daemon running, and I don't care what distribution of Linux it runs on (see registry below)ĭocker containers run a single process when started, but complex installations of software which require multiple daemons running simultaneously (RHEV-M, Satellite, etc) can be done.

I need a scratch pad that is NOT my system.

I need to test the functionality of a specific version of software.

I need to quickly verify the command line options of a program.

I need to see the man page from a specific version of RHEL, CentOS or Fedora.The average command in Docker takes under a second to time docker run fedora cat /etc/redhat-release Docker has quite an amount of buzz around it today because it makes so many things easy that were difficult with virtual machines.ĭocker containers makes it easy for Developers, Systems Administrators, Architects, Consultants and others to quickly test a piece of software in a container much quicker than a virtual machine, and using less resources.

Docker centos