[hobbit] big brother replacement

[Sloan]

This looks promising, I'll give it a whirl -

Joe

Henrik Stoerner wrote:
> Hi Joe,
>
> On Thu, Nov 01, 2007 at 03:20:12PM -0700, Sloan wrote:
>   
>> So, the $64 question: Is there anything in hobbit, or on the horizon,
>> which will allow hobbit to serve as a drop-in replacement for bb,
>> including the failover capability?
>>     
>
> The BB "failover" script does two things: It makes the network tests 
> run on the failover server if the primary BBNET server cannot be
> ping'ed; and it enables alerts being sent from the failover server
> if there is no connection from the failover server to the primary
> BBPAGER server.
>
>
> The network-test failover is fairly simple to do. I've attached two
> scripts here, both of which must run on the backup/standby/failover 
> server:
>
> 1) failover.sh - goes in ~hobbit/server/ext/
>    Add a section to hobbitlaunch.cfg with
>
>       [failovercheck]
> 	ENVFILE /usr/lib/hobbit/server/etc/hobbitserver.cfg
> 	NEEDS hobbitd
> 	CMD $BBHOME/ext/failover.sh 10.0.0.1 hobbitnet.mydom.com
>
>    "10.0.0.1" is the IP of your primary Hobbit server,
>    "hobbitnet.mydom.com" is the hostname (in the bb-hosts file) of the
>    primary network test machine.
>
>    What this does is that it queries the primary Hobbit server for how
>    long ago the network tests were updated. If more than 7 minutes ago
>    it deems the primary network test node to be DOWN, and flags this via
>    the file $BBTMP/primarynetDOWN. If the network test update was less
>    than 7 minutes ago, it removes the file.
>
>    This is then used by the other script, which replaces the CMD in the
>    "[bbnet]" section in hobbitlaunch.cfg.
>
> 2) failovernet.sh - goes in ~hobbit/server/ext/
>    When this runs to do the normal network tests, it will check for the 
>    presence of the $BBTMP/primarynetDOWN file. If this file exists, it
>    picks up the IP of the primary Hobbit server from the file, and
>    modifies the settings to report data to both the normal (local)
>    Hobbit server, and to the primary server. If the file does not exist,
>    it will just run the network tests the normal way.
>    So to run this, modify the [bbnet] section in hobbitlaunch.cfg and
>    change the CMD setting to "$BBHOME/server/ext/failovernet.sh"
>
>
> The alert failover is different, because Hobbit doesn't have a separate
> BBPAGER server - alerts are sent from the same host that handles the
> Hobbit data collection and webpages. A solution to this has been
> implemented for the next release, where the alerting module can be
> distributed onto multiple servers, but only one of them will send alerts
> at any given time.
>
>
> Regards,
> Henrik
>
>   
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