munin-node.conf 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 extensions.
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 this:
- cidr_allow NETWORK/MASK
An alternative to
allow RE. This allows the access list to be specified in CIDR format. For instance,
cidr_allow 192.0.2.0/24would allow connections from any IP from 192.0.2.1 to 192.0.2.254.
cidr_allow 127.0.0.1/32is the equivalent to the example above. Note that the netmask must be provided, even though it's just
This option requires that the
Net::CIDRPerl module be installed.
- 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.
enabledrequire a TLS connection, while
disabledwill not attempt one at all.
The current default is
Autocauses 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
no. It determines if the remote certificate needs to be signed by a CA that is known locally. Default is
- tls_private_key <value>
This directive sets the location of the private key to be used for TLS. Default is /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 /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 is /etc/munin/cacert.pem.
- 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
- 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 directive:
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:
log_level 4 log_file /var/log/munin/munin-node.log port 4949 pid_file /var/run/munin-node.pid background 1 setsid 1 host * user root group root setsid yes ignore_file \.bak$ ignore_file \.rpm(save|new)$ ignore_file ^README$ allow ^127\.0\.0\.1$ ignore_file \.dpkg-(old|new)$ ignore_file \.rpm(save|new)$
See the documentation or Munin homepage <http://munin-monitoring.org/> for more info.
Copyright (C) 2002-2006 Audun Ytterdal, Jimmy Olsen, Dagfin Ilmari MansXker, Nicolai Langfeldt
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