munin-node.conf - Munin-node configuration file
is the configuration file for "munin-node", the
agent that Munin fetches data from.
The format is dictated by the use of "Net::Server". A look at
"perldoc Net::Server" will give a list of options that the file
supports by using the module. This page mainly covers the Munin-specific
The following options are of special interest:
- allow RE
- IP based access list is implemented through this. The statement may be
repeated many times. It's important to note that it's actually a regular
expression after the keyword so to allow localhost it must be written like
- cidr_allow NETWORK/MASK
- An alternative to "allow RE". This allows the access list to be
specified in CIDR format. For instance, "cidr_allow
192.0.2.0/24" would allow connections from any IP from 192.0.2.1 to
And "cidr_allow 127.0.0.1/32" is the equivalent to the example
above. Note that the netmask must be provided, even though it's
This option requires that the "Net::CIDR" Perl module be
- host IP
- The IP number of the interface munin-node should listen on. By default
munin-node listens to all interfaces. To make munin-node listen only on
the localhost interface - making it unavailable from the network do this:
- host_name <host>
- If set, overrides the hostname munin-node uses in its 'hello'-negotiation
with munin. A "telnet localhost 4949" will show the hostname
munin-node is currently using. If munin-node and the main munin
installation do not agree on the hostname, munin will skip all the plugins
of the machine in question.
- paranoia <yes|no|true|false|on|off|1|0>
- If set, checks permissions of plugin files, and only tries to run files
owned by root. Default on.
- ignore_file <regex>
- Files matching <regex> in the node.d/ and node-conf.d/ directories
will be overlooked.
- tls <value>
- Can have four values. "paranoid", "enabled",
"auto", and "disabled". "Paranoid" and
"enabled" require a TLS connection, while "disabled"
will not attempt one at all.
The current default is "disabled" because "auto" is
broken. "Auto" causes bad interaction between munin-update and
munin-node if the node is unprepared to go to TLS.
If you see data dropouts (gaps in graphs) please try to disable TLS.
- tls_verify_certificate <value>
- This directive can be "yes" or "no". It determines if
the remote certificate needs to be signed by a CA that is known locally.
Default is "no".
- tls_private_key <value>
- This directive sets the location of the private key to be used for TLS.
Default is /usr/local/etc/munin/munin-node.pem. The private key and
certificate can be stored in the same file.
- tls_certificate <value>
- This directive sets the location of the TLS certificate to be used for
TLS. Default is /usr/local/etc/munin/munin-node.pem. The private key and
certificate can be stored in the same file.
- tls_ca_certificate <value>
- This directive sets the CA certificate to be used to verify the node's
certificate, if tls_verify_certificate is set to "yes". Default
- tls_verify_depth <value>
- This directive sets how many signings up a chain of signatures TLS is
willing to go to reach a known, trusted CA when verifying a certificate.
Default is 5.
- tls_match <value>
- This directive, if defined, searches a dump of the certificate provided by
the remote host for the given regex. The dump of the certificate is two
lines of the form:
Subject Name: /C=c/ST=st/L=l/O=o/OU=ou/CN=cn/emailAddress=email
Issuer Name: /C=c/ST=st/O=o/OU=ou/CN=cn/emailAddress=email
So, for example, one could match the subject distinguished name by the
tls_match Subject Name: /C=c/ST=st/L=l/O=o/OU=ou/CN=cn/emailAddress=email
Note that the fields are dumped in the order they appear in the certificate.
It's best to view the dump of the certificate by running munin-update in
debug mode and reviewing the logs.
Unfortunately, due to the limited functionality of the SSL module in use, it
is not possible to provide finer-grained filtering. By default this value
is not defined.
A pretty normal configuration file:
See the documentation or Munin homepage <http://munin-monitoring.org/> for
Copyright (C) 2002-2006 Audun Ytterdal, Jimmy Olsen, Dagfin Ilmari MansXker,
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
This program is released under the GNU General Public License