What Is It Like Migrating Mission Critical Servers from Paid Linux (RHEL) to Free Linux (CentOS)?
Stephane Saux, IT Director of SFGate.com, the Web site of the San Francisco Chronicle, begins a series of questions and answers about a recent Linux migration project.
Q: When we spoke several months ago you were considering a move from Red Hat to a free binary clone of RHEL (Red Hat Enterprise Linux) like CentOS. Are you still going forward with that, and if so, why?
A: Yes. We've been using Red Hat 7.3 for five years on about three dozen production servers, but now we are migrating to CentOS 5. We have a large commercial Web site serving tens of millions of page views per month and generating a lot of advertising revenue for our company. We don't like change for its own sake. When we get production servers up and running successfully from a stable OS image, and we see that they are doing their job without too many problems, we don't have any incentive to touch them. It's in our interest to change them as little as possible. However, that does create a problem, because the versions of the software you use can get really old. That's what happened to us with Red Hat 7.3. We've been using it for years and it worked fine during all that time. But eventually new versions of the applications we use like Perl and Apache came along that work better with more recent versions of Linux.
Q: What will the migration process look like?
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