Archive for the ‘FreeBSD’ Category

munin and gaps in df_ graphs

May 2, 2009

Someone forgot to add samba filesystem into the df’s ignore list in FreeBSD port of munin-node. They grep out strings  with “//”  (which is… strange, not to say stupid).

Most of users will have gaps in df munin graphs as the result. Remote filesystem info may be not accessible for dozens of reasons and cause the whole df_ plugin to timeout, which will report “unknown” values to munin and you will get alert email into your inbox and gap in the graph.

To resolve the problem you will need to add smbfs and cifs into the ignore list in two lines of both /usr/local/share/munin/plugins/df_ and df_inode files:

/bin/df -P -t noprocfs,devfs,fdescfs,linprocfs,nfs,smbfs | tail +2 | grep -v “//” | while read i; do

This should be fixed in two lines in each file. You may remove `grep` if you want, I keep it just to be safe.

P.S.: As far as I know the problem exists also in Linux. In the RedHat’s and Ubuntu’s repos at least.

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Adding new entry into /etc/periodic/

May 24, 2008

Did you know that you can easily add new time intervals into the system’s periodic feature?

Let’s add /etc/periodic/hourly as the example:

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Tuning FreeBSD to serve 100-200 thousands of connections

April 19, 2008

I’m back finally. There’s the translation of the Igor Sysoev’s report made on the RIT conference. Igor Sysoev is the creator of one of the most used lightweight http servers in Russia and the world – nginx. (more…)