Easy Linux DRBD cluster

Posted on July 24, 2013 by admin

If you are looking for an easy way to set up a DRBD cluster with automatic failover, take a look at the LCMC tool. It really simplifies the setup of corosync and pacemaker to give you failover clustering. It is definitely worth a look. Watch the videos on this site.

http://lcmc.sourceforge.net/

Posted in DRBD, Linux | Comments Off on Easy Linux DRBD cluster

ImportError: cannot import name utils

Posted on June 20, 2013 by admin

If you get an error like this:


File "python/local/lib/python2.7/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 9, in <module>
from django.db import utils
ImportError: cannot import name utils

You need to install psycopg2.  You will also probably need to


apt-get install build-essential libpq-dev

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Remote command execution failed

Posted on May 2, 2013 by admin

When running check_by_ssh commands in nagios, one often receives this annoying  message, and no data.   To fix it, become the nagios user and ssh to the server you are checking by ssh.  It will add the server to the known_hosts file and you won’t get the message anymore.

Another trick is to use the -E flag at the end of the check_by_ssh command.  That is my favorite way since it saves me some time.

 

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Error: pg_config executable not found.

Posted on April 10, 2013 by admin

This bogus error can be frustrating to figure out. I have figured it out a few times over the years and always forget how I solved it because it only occurs on a server where you have never deployed a python – postgres app. It’s easy once you know how.


apt-get install libpq-dev

Posted in Linux, postgres, python | Comments Off on Error: pg_config executable not found.

Kerberos not working. Kinit says “password incorrect”

Posted on April 5, 2013 by admin

I was trying to test my kerberos configuration, but I kept getting “Password Incorrect”:


root@samba4:/etc/samba# kinit administrator
[email protected]'s Password:
kinit: Password incorrect

See that lowercase @mydomain.local? That is the problem. The domain must be in upper case in your krb5.conf file. How frustrating.

Posted in Linux | Comments Off on Kerberos not working. Kinit says “password incorrect”