[Gluster-users] Upgrading gluster installation -- best practices guide?

[Raghavendra G]

Hi paul,

On Fri, Jan 15, 2010 at 11:32 PM, Paul <pkoelle at gmail.com> wrote:

> Hi all,
>
> We run glusterFS in our testing lab (since 2.0rc1). We are currently using
> client-side AFR (mirror) with two server and two clients over GigE.
>
> Testing is going well except one important point: How do you upgrade with
> minimal/zero downtime? Here I have several questions:
>
> 1. Is the wire-protocol stable during major releases? Can I mix and match
> all 2.0.x client/servers? If not how do find out which one are compatible?
>

we would suggest you to use both client and server from same version of
glusterfs. Are there any reason for not trying out 3.0?


>
> 2. Can I export one directory on the servers through multiple instances of
> glusterfsd (running on different ports)? This would allow to run old and new
> version in parallel for a short time and do a test from the client.
>

No.


>
> 3. How do I restart clients without shutting down all services accessing
> the mountpoint? Will glusterfs re-read config via signals (HUP)? Or is it OK
> to kill/restart in one go?
>

All the services accessing mount point have to be stopped, before restarting
glusterfs.


>
> How do YOU handle upgrades, especially wrt downtime and rolling back to a
> known good configuration?
>

we follow follow order:
1. stop all the services accesing mount point.
2. unmount glusterfs clients.
3. kill all the servers.
4. install new version of glusterfs.
5. start glusterfs servers.
6. start glusterfs clients.


>
> cheers and thanks in advance
>  Paul
>
> BTW: I have automated most of compile/install/confgen/start/stop on
> multiple clients/servers via bash/ssh. If someone is interested I could
> share it here.
>
> PS: Sorry to the list moderator, first try with wrong FROM-address
>
>
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-- 
Raghavendra G