Earlier this morning while working on a CentOS Linux development server I received errors when doing anything with the yum package manager. I believe the error started after upgrading the kernel on the server from kernel version 2.6.18-164.15.1.el5 to kernel version 2.6.18-194.3.1.el5. After upgrading the kernel yum would output the same error multiple times as shown in the below output example.
Awhile back I upgraded the “rack” gem on one of our CentOS Linux servers that runs LiteSpeed and Ruby. The upgrade took the rack gem from rack version 1.0.0 to rack version 1.0.1. After upgrading the Rack gem I attempted to visit the site located on the server where the gem was updated only to receive a 503 error from LiteSpeed. During the troubleshooting process I looked at the LiteSpeed error logs and noticed errors that lead me back to the Rack gem I had just updated. Below I describe the error in more detail and what can be done to resolve the issue of rack-1.0.1.