Upgrading to Redmine 3.0.1 on Debian Wheezy

Today I wanted to upgrade my Redmine installation from Redmine 2.6.x to the new version Redmine 3.0.1. Since I already have processed many Redmine updates I thought this update would be easy as always, but certainly I ran into an unexpected problem. After I followed all steps from the upgrade manual I restarted the apache2 process, so mod_passenger reloads the Redmine application. After that, Redmine did'nt start and showed the following error message:

undefined method `page_cache_directory' for ActionController::Base:Class

After doing some Google search, I found this article on stackoverflow, which pointed me to the right direction. Actually, Debian Wheezy comes with an pretty old version of Phusion Passenger (3.0.x), so I performed the following steps and installed a newer version (4.0.x) of Phusion Passenger from Wheezy Backports.

First I added Wheezy Backports to my apt sources file /etc/apt/sources.list

deb http://http.debian.net/debian wheezy-backports main

Next I used apt-get update to update the local apt repositories and finally I installed Phusion Passenger from the Wheezy Backports with the following command

apt-get -t wheezy-backports install "libapache2-mod-passenger"

After this, I restarted the apache2 process and Redmine 3.0.1 started successfully.

MySQL errno: 24 after upgrade from Debian Squeeze to Wheezy

Today I upgraded one of my Debian Squeeze servers to Debian Wheezy. During the upgrade, MySQL came up with some error messages like shown below:

[ERROR] /usr/sbin/mysqld: Can't open file: './database/table1.frm' (errno: 24)
[ERROR] /usr/sbin/mysqld: Can't open file: './database/table2.frm' (errno: 24)
[ERROR] /usr/sbin/mysqld: Can't open file: './database/table3.frm' (errno: 24)
[ERROR] /usr/sbin/mysqld: Can't open file: './database/table4.frm' (errno: 24)

After some research I found out, that the cause of the problem could be, that the mysql process has too many open files. I then added the following to the my.cnf and restarted the mysql service.

[mysqld]
open_files_limit = 10000

You may adjust the limit to a value of your choice. The default limit for Debian systems is 1024, so I would recommend to set this the limit to a value greater than 1024.

After adjusting the open files limit, the mysql server was running fine again.