[CentOS] Centos 6.0 , DRBD

Wed Oct 12 12:50:33 UTC 2011
Marko Weber <weber at zackbummfertig.de>

Hi Ljubomir,

i am completely confused now.
With elrepo u dont mean "epel.repo" or?
How do i enable this "elrepo" in Centos?


Am 12.10.2011 12:16, schrieb Ljubomir Ljubojevic:
> Vreme: 10/12/2011 07:10 AM, Karanbir Singh piše:
>> Hi,
>> On 10/11/2011 06:23 PM, Ljubomir Ljubojevic wrote:
>>> I do not have to read it (although I understood you the first 
>>> time). My
>> its strange then you feel compelled to comment on something without
>> making an effort to even see what the other person is talking about.
>>> production server is not going to be a ginipig for developers. And 
>>> I, so
>>> far, rebuilt over 100 packages including newer Qt for C6.
>> people with the idea of a 'production' setup usually also understand 
>> the
>> idea of 'devel' and 'testing'. People who dont have an idea of
>> 'production' dont need to care about or are already isolated from
>> needing to care about 'devel' and 'testing', isnt it ?
>> Just saying.
>> - KB
> Joseph's post was:
> Yeah, but generate rpm's for final installation, its trivial.
> http://www.drbd.org/users-guide-emb/s-build-rpm.html
> End of the link says Build Rpm. So, install building tools and
> environment, and kernel-devel on the production system (5 years ago I
> was thought that it is not wise to do so), and compile it against 
> your
> kernel.
> And there is already built and tested "kmod-" module from ELRepo.
> Just so I can answer you (all), I visited that web page and read 
> following:
> "Note that any kernel upgrade will require you to generate a new 
> drbd-km
> package to match the new kernel."
> So, my assumption that kernel upgrade without rebuilding the module
> would brake his production server was correct.
> I used to use madwifi-kmdl kernel modules for my Atheros wireless 
> radio
> card, and each time I upgraded kernel I had to upgrade/install new
> module also. Very tiresome.
> Then I studied kmdl vs kmod packages and learned that kmod packages 
> do
> not need any recompilation after kernel upgrade. They use 
> "weak-update"
> model (essentially symlinks) as long as new kernel has same ABI as
> previous ones. Install process of new kernel checks kernel modules of
> currently installed kernels and symlinks them, avoiding need for
> building them or installing new packages (hoping they are already
> available). I was delighted when I saw that ELRepo developers use 
> kmod
> model, no more messing with kernel modules.
> That is why I suggested using ELRepo kernel module package instead of
> self-built one. Only reason I can see in building your own module is 
> to
> use those other packages (like drbd-heartbeat).
> I hope this finally clears up what I tried to say:
> 1. Joseph's link clearly stated it was for self building the rpm(s) 
> so I
> did not need to visit the link to know what is on the page.
> 2. Developers of kernel module packages rarely use kmod approach in 
> fear
> people will mess it up (like installing vanila kernel on CentOS 
> sistem
> and still calling it CentOS,...). Ubuntu and Arch users especially 
> have
> this problem, so it is safer to build for each new kernel.
> 3. Kernel module re-packagers from ELRepo have luxury of safely 
> offering
> kmod packages for EL kernels, and I believe this is safest and best
> approach.
> --
> Ljubomir Ljubojevic
> (Love is in the Air)
> PL Computers
> Serbia, Europe
> Google is the Mother, Google is the Father, and traceroute is your
> trusty Spiderman...
> StarOS, Mikrotik and CentOS/RHEL/Linux consultant
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