munin-node.conf(5)

MUNIN-NODE.CONF(5) Munin Documentation MUNIN-NODE.CONF(5)

NAME
munin-node.conf - Munin-node configuration file

DESCRIPTION
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:

allow ^127\.0\.0\.1$

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 192.0.2.254.

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
just "/32".

This option requires that the "Net::CIDR" Perl 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 127.0.0.1

Additional options:
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 /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 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 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.

EXAMPLE
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.

AUTHORS
Jimmy Olsen.

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

2.0.63 2020-06-08 MUNIN-NODE.CONF(5)

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