On Sun, Jan 30, 2011 at 2:37 PM, Chuck Munro <chuckm at seafoam.net> wrote: > Hello list members, > > My adventure into udev rules has taken an interesting turn. I did > discover a stupid error in the way I was attempting to assign static > disk device names on CentOS-5.5, so that's out of the way. > > But in the process of exploring, I installed a trial copy of RHEL-6 on > the new machine to see if anything had changed (since I intend this box > to run CentOS-6 anyway). > > Lots of differences, and it's obvious that RedHat does things a bit > differently here and there. My focus has been on figuring out how best > to solve my udev challenge, and I found that tools like 'scsi_id' and > udev admin/test commands have changed. The udev rules themselves seem > to be the same. > > Regarding networking, all of my 'ifcfg-*' files from CentOS-5.5 worked > well, including bridging for KVM. Of course, one of the first things I > did was remove that atrocious NetworkManager package ... it needs to be > rewritten to make it a *lot* more intuitive. RedHat uses it during > installation to manually configure the NICs, which I think is a > mistake. I much prefer the way CentOS anaconda has done it so far, as a > separate install menu form. Unfortunately, working out all the dependencies and preventing it from activation is more tricky. I suggest putting "NM_CONTROLLLED=no" in all your /etc/sysconfig/network-scripts/ifcfg-* files, it just makes the whole thing a lot safer for server class installations. I don't know if it's more stable or workable in the latest Fedora releases, but I'm still unhappy with it in CentOS and RHEL. > The performance of the machine seemed to be better with the newer > kernel, which is encouraging. I suspect we can look forward to a number > of improvements. I've just managed to scratch the surface. I do expect > there may be a few challenges for those of us upgrading a system from > 5.x to 6, where some user-written admin scripts could break depending on > the system commands they use. Ohhhhh, yes. This is inevitable with OS updates this far apart: just the switch from the default sendmail and syslog to postfix and rsyslog caught me somewhat by surprise.