Environment variables accessible in plugins¶
The node automatically defines some environment vars. All the munin-related
vars do begin with the MUNIN_ prefix and are all capitals.
Munin related¶
MUNIN_DEBUGDefines the debug level the plugin should run in.
Default:
0MUNIN_MASTER_IP- Contains the IP of the connecting master. If using
munin-run, it is equal to the"-"string. MUNIN_CAP_MULTIGRAPH- Defines if the master is able to understand the
multigraphkeyword.
| Value | Description |
|---|---|
| 0 | Master does not understand the multigraph keyword. |
| 1 | Master does understand the multigraph keyword. |
MUNIN_PLUGSTATEDefines the directory that a plugin must use if it wants to store stateful data that is shared with other plugins.
Default:
/var/lib/munin-node/$USER
Note
Only the plugins that execute themselves as the same user can exchange data, for obvious security reasons.
MUNIN_STATEFILEDefines a file that the plugin must use if it wants to store stateful data for himself.
It is guaranteed to be unique, per plugin and per master. Therefore 2 masters will have 2 different state files for the same plugin.
Config related¶
Here is a list of other environment vars, that are derived from the Munin::Common::Defaults package.
MUNIN_PREFIX
MUNIN_CONFDIR
MUNIN_BINDIR
MUNIN_SBINDIR
MUNIN_DOCDIR
MUNIN_LIBDIR
MUNIN_HTMLDIR
MUNIN_CGIDIR
MUNIN_CGITMPDIR
MUNIN_DBDIR
MUNIN_PLUGSTATE
MUNIN_SPOOLDIR
MUNIN_MANDIR
MUNIN_LOGDIR
MUNIN_STATEDIR
MUNIN_USER
MUNIN_GROUP
MUNIN_PLUGINUSER
MUNIN_VERSION
MUNIN_PERL
MUNIN_PERLLIB
MUNIN_GOODSH
MUNIN_BASH
MUNIN_PYTHON
MUNIN_RUBY
MUNIN_OSTYPE
MUNIN_HOSTNAME
MUNIN_HASSETR
System related¶
Munin does redefine some system environment vars :
PATH- This is redefined for security. It does provide a safe environment so
that shell scripts are able to launch regular commands such as
cat,grepwithout having to be explicit in their location. LC_ALL&LANG- This is redefined to ease the work of plugin authors. It enables a standard output when parsing common commands output.
