[op5-users] User experience with Merlin first time install

[Tom Welsh]

Hi Andreas,

When I carried out my install of Merlin I had to modify the following lines
from the install-merlin.sh and object_importer.inc.php. I would suggest it
may be better to allow the users to specify the path to the Nagios base
directory on the commandline as a parrameter for the install. Failing this,
the default installation path for Nagios should be in the files. I know this
is what stopped my initial installation.

Heres the parts Im talking about in both files along with line numbers. and
what i think they should default to.

Regards

Tom

In install-merlin.sh

From

   8 nagios_cfg=/opt/monitor/etc/nagios.cfg
   9 dest_dir=/opt/monitor/op5/merlin

To

   8 nagios_cfg=/usr/local/nagios/etc/nagios.cfg
   9 dest_dir=/usr/local/nagios/merlin

In object_importer.inc.php

From

 318                 if (!$object_cache)
 319                         $object_cache =
'/opt/monitor/var/objects.cache';

To

 318                 if (!$object_cache)
 319                         $object_cache =
'/usr/local/nagios/var/objects.cache';

And

 500                 if (!$object_cache)
 501                         $object_cache =
'/usr/local/nagios/var/objects.cache';

2009/6/16 Andreas Ericsson <ae at op5.se>

> Frater, Greg J wrote:
> > Andreas et. al.,
> >
> > Based on information from the Nordic Meet, it looks like Merlin and
> > Ninja are going to be default Nagios components in the future, thus I
> > thought I would offer 2 cents worth of documentation and testing of
> > Merlin from a users perspective.
> >
>
> Ooh, neat :-)
>
> > Environment: Nagios 3.0.6 MySQL 5.0.45 OS: RHEL 5.3 64-bit Merlin:
> > 0.5 Setup: Single Nagios installation with all components (Nagios
> > core, CGI's, NagVis, PNP, Merlin, etc.) running on the same box,
> > monitoring 577 hosts and 5290 services.
> >
> > Download source:
> >
>
> [ so far so good ]
>
> >
> > Create mysql user for the merlin module to use when connecting to the
> > database
> >
> > mysql -u root -e \ CREATE USER merlin IDENTIFIED BY
> > 'YourPasswordHere';
> >
> > Compile Merlin:
> >
> > make
> >
> > I got some warnings when I ran make, I don't know what they mean.  I
> > thought they might be related to my OS being 64 bit, but I don't
> > know, I proceeded with my install  Here they are though Note: my
> > install crashed 10 minutes after starting it up, this may be related,
> > I posted the crash info seperately:
> >
>
> They are related to 64-bitness of your system. It's safe to ignore them
> until you're using more than 4 billion poller nodes to a single Merlin
> system, so I haven't bothered to correct them.
>
> >
> > Run Merlin Installation script:
> >
> > sh install-merlin.sh --dest-dir=/usr/local/nagios/merlin
> > --nagios-cfg=/usr/local/nagios/etc/nagios.cfg  --db-type=mysql
> > --db-user=merlin --db-pass=YourPasswordHere --db-name=merlin
> >
> > I got some errors on install: ERROR 1045 (28000): Access denied for
> > user 'root'@'localhost' (using password: NO) ERROR 1045 (28000):
> > Access denied for user 'root'@'localhost' (using password: NO)
> > Creating database merlin mysqladmin: connect to server at 'localhost'
> > failed error: 'Access denied for user 'root'@'localhost' (using
> > password: NO)'
> >
> > ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using
> > password: NO) Failed to setup database. Aborting.
> >
> > The script expects your mysql database to allow the user
> > root at localhost to login without a password.  We have a password for
> > that user in our setup.  I messed with the install script a bit to
> > get around it but don't know enough to know how to do this right.  So
> > instead, I temporarily removed the password for this user on my
> > system and reran the install script.  It worked after that.
> >
>
> Right. I'll make it prompt the user for the password to use.
>
> > The Merlin install script modifies your Nagios configuration files
> > (specifically the main one nagios.cfg).  You need to check the Nagios
> > config before restarting Nagios:
> >
> > /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
> >
> > If the config verifies okay then restart Nagios: service nagios
> > restart
> >
> > Running configuration check...done. Stopping nagios: .done. Starting
> > nagios:Logging to '/usr/local/nagios/merlin/logs/neb.log'
> > [1245098202] 6: Merlin Module Loaded [1245098202] 6: Coredumps in
> > /tmp done.
> >
> > It appeared to restart okay, though the last line 'Coredumps in /tmp'
> > made me a bit nervous.
> >
>
> Heh. It's only there to say "current working directory is ... ", but
> when I added that line I was specifically looking for where Nagios put
> its coredumps, so it turned out that way ;-)
>
> > Start Merlin Daemon: service merlind start
> >
> > I think that's it, it should be up and running.  The Merlin module
> > logs events to /usr/local/nagios/merlin/logs/neb.log, and the daemon
> > logs events to /usr/local/nagios/merlin/logs/daemon.log.
> >
> > Andreas, please review these steps for accuracy, I'm working only
> > from the README and guessing the rest.  Hopefully this is usefull to
> > others.
> >
>
> That's indeed the correct steps. I'll amend the install script so that
> root users with a password for mysql can use it with less hassle than
> temporarily removing the password though.
>
> Thanks for the writeup! :-)
>
> --
> Andreas Ericsson                   andreas.ericsson at op5.se
> OP5 AB                             www.op5.se
> Tel: +46 8-230225                  Fax: +46 8-230231
>
> Considering the successes of the wars on alcohol, poverty, drugs and
> terror, I think we should give some serious thought to declaring war
> on peace.
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