Vincent Cojot wrote:
>
> Hi everyone,
>
> At one of my customer sites, we use a number of 'legacy' custom-built graphical
> apps built with glibc-2.1.
> typically, these apps use X11, motif and.. OpenGL/GLX.
> Also, some of these apps require the use of the infamous "export
> LD_ASSUME_KERNEL=2.2.5" under RHEL3/RHEL4.
>
> But alas, the time has come to move to a newer RHEL along with an x86_64 kernel.
>
> Since they aren't ready to give up on these apps or re-build them (lack of
> engineering resources), I am left with the following transition options:
>
> 1) run a fully copy of RHEL4 x86 under VMWare server on every RHEL5/x86_64
> workstation and export the app display to the native RHEL5 display using the
> network.
>
> 2) find a way to provide a full set of ia32 libraries under RHEL5 to enable
> those legacy apps on an x86_64 RHEL.
>
> 3) run the apps in a paravirtualized 32bit guest (but that's not
> supported/doable on RHEL 5.1, right?)
>
> 4) use the Solaris/SPARC version of those 32bit apps and get newer SPARC
> workstations since these apps run very fine on modern 64bit SPARC workstations
> under Solaris 10 and will continue to run under 11.
>
> - I fear that option 1) would eat up all of the resources very quickly.
> - On the other hand, I haven't noticed any official document on providing a full
> set of ia32 libs under the x86_64 version of RHEL5 like what exists on Solaris.
> - I heard the 'LD_ASSUMER_KERNEL' stuff is gone in RHEL5, is that true?
> - I'd like to avoid option 4) because of all the trouble in re-deploying just
> about everything.
>
> Any comments, ideas, relevant documents/links very welcomed.
>
> Thanks,
>
> Vincent S. Cojot
>


On my x86_64 RH5.1 system:

$ export LD_ASSUME_KERNEL=2.2.5
$ ls
ls: error while loading shared libraries: librt.so.1: cannot open shared
object file: No such file or directory

So, it is certainly true that you can't do LD_ASSUME_KERNEL=2.2.5 anymore.

One of the benefits of Redhat Enterprise was the long support window for
each major release. So if you don't want to re-deploy to Solaris, I'd
keep it on RH4. VMware server runs reasonably if you've got decent
memory and fast disk (I/O is a major bottleneck).

Hugh

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