Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

So we have a Java webapp going from a 32bit RHEL4 system to a 64bit RHEL5 system. We did the same thing from a 32bit RHEL to a 64-bit Ubuntu but needed ia32-libs to get java running.

Does RHEL5 have an equivalent to ia32-libs? I heard of something called multilib in rhel?

share|improve this question

Multilib is the idea of having side-by-side 64- and 32-bit everything on a system. To be 64-bit, a process must use exclusively 64-bit libraries. If one or more required libraries are not available in 64-bit then the application will run in 32-bit mode. These libraries are separated into two separate /lib directories: one for 64-bit, one for 32-bit.

Ideally you run most everything in 64-bit. In fact, if you know everything you'll run is 64-bit some distros (my experience is with Gentoo) allow you to disable multilib and decrease your install size.

Red Hat doesn't have an equivalent of ia32-libs. You need to install 32-bit versions of whatever software you need using yum:

yum install <package>.i586

You can use ldd to determine library dependencies, and then use yum provides to look for the appropriate package.

Lastly, make sure you're using a 64-bit JRE. I don't normally use non-Oracle JREs or JDKs so I'm not sure how the OpenJDK/IBM/etc. packages are handled, but with Oracle it's a simple matter of picking the correct version to download.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.