asterisk users - Jun 2009 - Recompiling dahdi-linux after kernel update - To minimize downtime

After a kernel update (but before rebooting) Is there a way to recompile
Zap/Dahdi against the new kernel?

My objective is to eliminate the additional downtime that occurs while
recompiling/installing zap/dahdi after booting into the new kernel.

Please correct me if I'm wrong:  
My understanding is that until you reboot (after a kernel update), recompiling
zap/dahdi still compiles against the OLD kernel, and that's why zap/dahdi
doesn't start after rebooting into the new kernel (even if you recompiled it
just before rebooting).

So my question is: 
Is there a method to recompile dahdi/zap against the new kernel such that the
only downtime is the actual server bounce itself?  OR is the current best
practice just to simply to reboot, recompile, restart?

Thanks in advance.

-Karl 
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On Thu, Jun 18, 2009 at 11:24:40PM -0500, Karl Fife
wrote:
> After a kernel update (but before rebooting) Is there a way to recompile
Zap/Dahdi against the new kernel?
> 
> My objective is to eliminate the additional downtime that occurs while
recompiling/installing zap/dahdi after booting into the new kernel.
> 
> Please correct me if I'm wrong:  
> My understanding is that until you reboot (after a kernel update),
recompiling zap/dahdi still compiles against the OLD kernel, and that's why
zap/dahdi doesn't start after rebooting into the new kernel (even if you
recompiled it just before rebooting).
> 
> So my question is: 
> Is there a method to recompile dahdi/zap against the new kernel such that
the only downtime is the actual server bounce itself?  OR is the current best
practice just to simply to reboot, recompile, restart?
without trying to start a distro war under debian you can do 


m-a -t build -l <kernel version> dahdi

aslong as you have the headers installed it will build a module against
it.

I think if you use the tgz tar ball you can actually specify KDIR to
point to the directory with the headers in it.


> 
> Thanks in advance.
> 
> -Karl 
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On Thu, Jun 18, 2009 at 11:24:40PM -0500, Karl Fife
wrote:
> After a kernel update (but before rebooting) Is there a way to recompile
Zap/Dahdi against the new kernel?
> 
> My objective is to eliminate the additional downtime that occurs while
recompiling/installing zap/dahdi after booting into the new kernel.
> 
> Please correct me if I'm wrong:  
> My understanding is that until you reboot (after a kernel update),
recompiling zap/dahdi still compiles against the OLD kernel, and that's why
zap/dahdi doesn't start after rebooting into the new kernel (even if you
recompiled it just before rebooting).
> 
> So my question is: 
> Is there a method to recompile dahdi/zap against the new kernel such that
the only downtime is the actual server bounce itself?  OR is the current best
practice just to simply to reboot, recompile, restart?
> 
> Thanks in advance.
1. install new kernel (but don't reboot yet)
2. in the dahdi-linux source directory:

  make KVERS=<new version>
  make KVERS=<new version> install

  or:

  make KSRC=/path/to/kernel/source/tree
  make KSRC=/path/to/kernel/source/tree install

3. reboot

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               Tzafrir Cohen
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