Got an old, long running app on CentOS-4 that you want to retain ? Running a full blown VM not worth while ? Well, Docker can help. As Jim found out earlier today :
I did a bad thing: $ docker run –rm -ti centos4:latest /bin/bash bash-3.00# cat /etc/redhat-release CentOS release 4.9 (Final)
— Jim Perrin (@BitIntegrity) January 16, 2015
Given that CentOS-4 is out of life now, we are not going to push CentOS-4 images to official CentOS collection on the Docker registry, but if folks want this, please ask and we can publish a short howto on whats involved in building your own.
Ofcourse, always consider migrating the app to a newer, supported platform like CentOS-6 or 7 before trying these sort of workarounds.
Docker is available out of the box, by defauly, on all CentOS-7/x86_64 installs.