Check_Disk Angel Plugin

Name

Check_disk

Author

Marco Paganini (paganini@paganini.net)

Description

This plugin checks for disk conditions on other hosts. It uses the rsh command to grab the output of ‘df’ on the remote unix system. Its behavior can be controlled by parameters (See Parameters below).

Parameters

This plugin accepts many options allowing a reasonable degree of control over its operation. The user may set new values for the yellow and red thresholds, or even ignore entirely a filesystem (mounted CDROMs are good candidates for this).

The parameter line should be in the format:

hostname!ostype!fs spacespec!fs spacespec...

Where:

• hostname

The host name. The system must be able to locate this box by this name, or else it won’t work.

• ostype

The operating system type. Currently supported types are linux,sco32,sco50 and hpux10.

• fs

The desired mount point. Angel will check this mountpoint and report any “out of order” space conditions on it. These conditions are calculated based on the “spacespec” parameter below. You may also use the meta-filesystem “default”. This will change the default values for all filesystems. You may change the default and override these values for specific filesystems.

• spacespec

This defines how the plugin should interpret the various space conditions on the specified mountpoint. Its format is “pctyellow pctred”. Every filesystem with more than pctyellow% of used space will be reported as “yellow”. Filesystems with more than pctred% will be flagged as “red”.

It may be a good idea to use “999 999” for cdrom filesystems. Since there won’t ever be a 999% filesystem, it will always report as “green”.

Examples

default 80 90!/cdrom 999 999!/home 60 70

Ignore the /cdrom filesystem (999% will never be reached), warn yellow if the filesystem occupancy reaches 80% and red if it reaches 90%. There’s an exception for the /home filesystem, in this case (yellow >= 60%, red >= 70%)

/u1 50 90!/u2 70 80!/u3 75 85

Different defaults will be used for the /u1, /u2 and /u3 filesystems. Every other filesystem will use the hardwired defaults (see the plugin source code for more details).

Bugs and other unpleasant things

Some things definitely need more work in this plugin:

• Many unix flavors do not use “rsh” as the “remote shell” command. HPUX, for instance, uses remsh whereas SCO Unix uses the “rcmd” command. Ideally, the plugin would check its host OS and adjust accordingly.

• There’s no support for SSH. Remote execution can do evil things to your health.

• The parameter format just plain sucks. It’s hard to read between all those exclamation signs.

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