Re: [Moosefs-users] ask about master and backup server (metalogger)

[Ioannis A. <ias...@fl...>]

You may want to use keepalive instead of ucarp. In any case, you tell
either of them that when the condition triggers, they have to run a
set of actions.

See http://www.keepalived.org/documentation.html for details.

On Mon, Sep 13, 2010 at 6:14 PM, Cuong Hoang Bui <bhc...@gm...> wrote:
> Hi,
>
> In the section "HOW TO PREPARE A FAIL PROOF SOLUTION WITH A REDUNDANT
> MASTER?", I'm not clear about configuration. Please tell me details.
> With 2 servers A, B, I install mfsmaster on both.
> - Configure A as master (CARP master), let mfsmaster running.
> - Let mfsmaster stop on B. Install metalogger on B, let it running.
>
> There are some cases as below.
> 1. Network connectivity on A broken, then CARP on B becomes master, but
> mfsmaster not running. How do I start it automatically in this case?
>
> 2. Network connectivity on A is okay but mfsmaster process is down. What
> should I do in this case? How do I monitor mfsmaster asynchronous so
> that I will shutdown CARP interface to switch to backup automatically?
> I dont want to use cron job to poll mfsmaster process.
>
> Please help me show some solutions for these cases.
>
> Besides, when I read this section, I'm not clear about this paragraph
> ===
> You also need an extra script run continuously testing the CARP
> interface state which in case if this interface goes in a MASTER mode
> would get two or three newest "changelog" files from any chunkserver
> (just by using "scp"), would also start mfsmetarestore and then
> mfsmaster. The switch time should take approximately several seconds and
> along with time necessary for reconnecting chunkservers a new master
> would be fully functional in about a minute (in both read and write modes).
> ===
> change logs file from chunkserver? Could you tell me details for this
> paragraph with a specific example.
>
> I'm really care about configuring master and backup failover for MooseFS.
>
> --
> **********************
> Regards,
> Cuong Hoang Bui
> ct...@ct...
> bhc...@gm...
> **********************
>
>
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Ioannis Aslanidis
System and Network Administrator
Flumotion Services, S.A.

sys...@fl...

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