Re: Updating the kernel

2013-11-22 Thread Vasiliy Tolstov 
2013/11/20 Soham Chakraborty sohamwonderpik...@gmail.com:
 Sure, sure - I do. I actually adore it ;)


Sorry for up old thread about ksplice. But does linux have
alternatives? For example i have server with some vps (kvm) and not
have shared storage.
After some time i need to update kernel. How can i deal with it with
minimal downtime not using ksplice?
Kexec?

-- 
Vasiliy Tolstov,
e-mail: v.tols...@selfip.ru
jabber: v...@selfip.ru

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Re: Updating the kernel

2013-11-22 Thread Valdis . Kletnieks 
On Fri, 22 Nov 2013 12:21:59 +0400, Vasiliy Tolstov said:

 After some time i need to update kernel. How can i deal with it with
 minimal downtime not using ksplice?
 Kexec?

The usual stock answer is run two instances with some sort of High-Availability
package between the two of them. Fail over to one instance, reboot the second,
then fail over to the now-rebooted second instance and reboot the first.  I've
done that on SGI boxes running CXFS and NFS - the NFS client machines see only
a 2-3 second pause.

(The bonus is that since the two boxes do heartbeat, it also means that if
one locks up or crashes, the other can seize control and continue processing
without users noticing.  So it's of benefit not just for updating the kernel.


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