linux By jim, 7 months ago

While updating my systems monitoring I discovered Munin today. Munin captures a wide variety of system information and dumps it into RRD files to ultimately graph it at a central location.

The user interface doesn't communicate problems well, but it provides the underlying data for you to answer those nagging questions that come up, like "When did our email traffic get so high?" or "Has that disk always run that hot?"

And my install notes:

Also install sensord, smartmontools, and ethtool when installing the munin-node package.
Make sure to punch a firewall rule for port 4949 from the central machine. The central machine does not want to get hung on one of the nodes.
Run sensors-detect after installing sensord.
Check your syslog after restarting sensord, a bunch of my Dells explode the daemon with a problem in the fan sensor, I have to take lm85 out of their modules.
If you are a linux user with SATA drives, then when you install smartmontools, you must edit the /etc/smartd.conf file to comment out the DEVICESCAN line and put in a specific device line with the "-d ata". May as well add a "-m you@email.address" while you are there so it will notify you. Don't forget to edit /etc/defaults/smartmontools to enable the daemon.
In /etc/munin/plugins/ you might wish to take out the ntp* files, unless you care about that. Look where those links go and you will see other plugins you could link in. I added veth* ones for my virtual ethernets and the smart one to get all my drive failure data.
Again, if on linux with SATA drives you must edit the /etc/munin/plugin-conf.d/munin-node file in a couple of places to tell it to use "-d ata"

Sample bits of /etc/munin/plugin-conf.d/munin-node:

[hddtemp_smartctl] user root env.drives sda env.type_sda ata
[smart_sd*] user root env.smartargs -H -c -l error -l selftest -l selective -d ata

comment

anonymous comment, 5 months ago

If you want to collect apache statistics with Munin you need to enable extended server status in apache.

ExtendedStatus On <Location /server-status> SetHandler server-status Order deny,allow Deny from all Allow from 127.0.0.1 Allow from munin-server.mydomain.com </Location>

If your web server does not bind to localhost (127.0.0.1), you need to define the server status URL in your /etc/munin/plugin-conf.d/munin-node config file.

[apache_*] env.url "http://servername.mydomain.com/server-status?auto"

anonymous comment, 5 months ago

If you run sendmail as your mail server munin has 3 plugins that are in the base Debian install. Link all 3 into your /etc/munin/plugins directory. One, sendmail_mailqueue will work out of the box. The other two depend on sendmail stats files that do not get created in a base Debian install.

To enable stats logging you must manually create the stats files.

# touch /var/lib/sendmail/sendmail.st
# touch /var/lib/sendmail/sm-client.st

Once these files have been created, with sendmail write permission, sendmail will start logging to them. Gotta love sendmail, "If you create the log file for me, I will write to it."

You can test your mail statistics file creation manually with the mailstats command.

The femtoblogger software is being written by Jim Studt. The content of this page is provided by anonymous individuals. If you believe something on this page is innapropriate contact Jim Studt.

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