On some of freshly installed servers (Debian Etch), I encountered these error messages in /var/log/munin/munin-node.log:

Use of uninitialized value in eval {block} exit at /usr/sbin/munin-node line 456, <CHILD> line 8.

What a great error message

After digging into Google results, I found it was just a problem with host_name variable in the configuration. Default value is hostname.localdomain. I’ve replaced it with a valid hostname and it works!

If you encounter this warning message under Linux:

2009/03/09 21:23:19 [warn] 26827#0: 4096 worker_connections are more than open file resource limit: 1024

A solution is to use the command ulimit in nginx start script, just before lunching nginx:

[...]
ulimit  -n 65536
[...]

If like me you just have upgraded your Debian system to Lenny, you probably encounter the following warnings while launching perl:

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = (unset),
        LC_ALL = (unset),
        LANG = "fr_FR.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

To get rid of these annoying messages, I’ve just reconfigured locales with the command:

# dpkg-reconfigure locales

Choose your locale when you’re asked for your “Default locale for the system environment”.

You should have a message like:

Generating locales (this might take a while)...
  en_US.UTF-8... done
Generation complete.

Then, logout, login and your perl installation works fine!

Sun JRE is available in the non-free repository. You need to update your repositories configuration file (/etc/apt/sources.list).

Add the following line:

deb http://ftp.us.debian.org/debian/ etch main contrib non-free

Update apt with apt-get update command and you’re ready to install the JRE.

$ apt-get install sun-java5-jre

Check your java binary:

$ java -version
java version "1.5.0_14"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_14-b03)
Java HotSpot(TM) Client VM (build 1.5.0_14-b03, mixed mode, sharing)

apticron is a shell script that send you an email report when new packages are available on your debian server.

Install apticron

As root, do:

apt-get install apticron

apticron configuration via /etc/apticron/apticron.conf

To receive reports on your email change the EMAIL variable in the configuration file. By default, reports are sent to the root user.

EMAIL="root" -> EMAIL="you@domain.com"

Reports received

Now apticron will send you reports like this:

apticron report [Sat, 26 Jul 2008 06:45:47 +0200]
==============================================
apticron has detected that some packages need upgrading on:

        localhost.localdomain

        [ 127.0.0.1 XXX.XXX.XXX.XXX ]

The following packages are currently pending an upgrade:

        lighttpd 1.4.13-4etch10

========================================================================

Package Details:

Reading changelogs...

--- Changes for lighttpd ---

lighttpd (1.4.13-4etch10) stable-security; urgency=low

  [ Pierre Habouzit ]

  * Non-maintainer upload.

  * Fix [CVE-2008-1531] patches mess, and add a missing hunk of the patch.

 -- Thijs Kinkhorst thijs debian org  Tue, 22 Jul 2008 12:19:10 +0200

========================================================================

You can perform the upgrade by issuing the command:

        aptitude dist-upgrade

as root on localhost.localdomain

It is recommended that you simulate the upgrade first to confirm that the actions that
would be taken are reasonable. The upgrade may be simulated by issuing the command:

        aptitude -s -y dist-upgrade

--
apticron

Apticron files

For more informations, you can have a look to those files:

/etc/cron.daily/apticron
/usr/sbin/apticron