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my RH server 5.0 is having some networking issues and I found version 5.3 and 5.4 have some updated versions for my NIC drivers as well as the Bond Channel Driver.
I would to know is it OK going to 5.0 to 5.4? or there is a way to go to 5.1 - 5.2 and 5.3 and 5.4 for security reasons...I don't want my system not workin after updating to the latest 5.4 If I do 5.0 -> 5.4 right away.
is it possible going version by version?
or I can update to 5.4 without any problems just using yum update?
If your using Red Hat Network then is very hard to update to a release level. If your running your own Satellite server then you could create a Software Channel to that release.
It should be safe to upgrade from 5.0 to the latest without problems, we do this a fair bit. Although I would recommend as always a full backup before you start.
Also I would first do a
yum update yum
Had a few issues where during the upgrade process where yum fails to upgrade itself first.
You can also upgrade only the security items, there is a plugin called yum-security, have a look for a RH KB item about it as another idea.
Unless you have excluded the kernel from your configuration, but by default it does not.
do a rpm -qa |grep kernel before the update and then after and you should see the new kernel installed. Remember that the new kernel does not take affect until you reboot.