Ubuntu Manpage: munin.conf - Munin configuration file

Provided by: munin-doc_2.0.25-2ubuntu0.16.04.4_all

NAME

       munin.conf - Munin configuration file

DESCRIPTION

Munin is a group of programs to gather data from hosts, graph them, create html-pages, and
optionally warn contacts about any off-limit values.

The hosts are divided into three groups: One master (could be more, but Munin is not
cluster aware so they'll likely be independent). The master contacts a number of machines
running munin-node, these are called nodes. Each node has data from one or more hosts
that is monitored by Munin.

munin.conf is the configuration file for the Munin master server. The programs using it
are munin-update, munin-graph, munin-limits and munin-html. There is also quite extensive
documentation of this file at <http://munin-monitoring.org/wiki/munin.conf>

The format of the file is simple. A minimal configuration looks something like:

[machine1.your.dom]
address localhost

The default location of munin.conf is /etc/munin/munin.conf. If your placement deviates
from this norm, use the "--config <file>"-option when running the munin-* programs.

Munin-update will expand all node-entries in this file, and save them to
/var/lib/munin/datafile, which is used by all programs in the package together with this
file.

Any directives in this file will override directives of the same name in datafile. E.g.,
if you want to change the title of the "load"-graph in the above minimum configuration,
you would modify the two bottom lines to:

[machine1.your.dom]
address localhost
load.graph_title Edited title of the load-graph

This will override the "graph_title" attribute of the "load" field/data series while
keeping all the others at their default.

GLOBAL DIRECTIVES

These directives should appear in munin.conf before any host or group definitions.

dbdir path (Default: /var/lib/munin)
Directory for generated database files. Required.

logdir path (Default: /var/log/munin)
Directory for log files. Required.

htmldir path (Default: /var/cache/munin/www)
Directory for HTML pages and graphs. Required.

rundir path (Default: /var/run/munin)
Directory for files tracking munin's current running state. Required.

tmpldir path (Default: /etc/munin/templates)
Directory for templates used to generate HTML pages. Required.

fork value
This directive determines whether munin-update fork when gathering information from
nodes. Possible values are "yes" and "no". Default is "yes". If you set it to "no"
munin-update will collect data from the nodes in sequence rather than in parallel and
this will take considerably more time. Affects: munin-update.

palette default|old
Choose palette between the very nice ""default"", and the good old ""old"".

graph_data_size value
This directive sets the resolution of the RRD files that are created. Possible values
are "normal" and "huge". Default is "normal". "Huge" is really huge, it saves the
complete data with 5 minute resolution for 400 days. This will probably increase the
I/O load on your Munin master, and currently has very little benefit. Affects: munin-
update.

graph_strategy value
Deprecated. (Graphs are now always drawn via CGI.)

local_address value
The local address to connect any node from in case the master has several IP
interfaces. This can be overridden by a group or global directive. Without this
directive Munins traffic will originate from the master server according to the IP
routing table.

max_processes <value>
This directive specifies the maximum number of processes to be used for gathering
information from nodes. If left blank, munin will use as many processes as necessary.
Affects: munin-update.

max_graph_jobs <value>
This directive specifies the maximum number of concurrent rrdgraph proesses started by
munin-graph. The default is 6. A setting of 0 disables concurrent processing.
Affects: munin-graph

max_cgi_graph_jobs <value>
This directive specifies the maximum number of concurrent munin-cgi-graph jobs. The
web server can start a high number of munin-cgi-graph jobs which we can't stop, but
munin-cgi-graph will throttle down how many rrdgraph calls will be running at the same
time to this number. Affects: munin-cgi-graph and munin-fastcgi-graph.

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. Affects: munin-
update.

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". Affects: munin-update.

tls_private_key <value>
This directive sets the location of the private key to be used for TLS. Default is
/etc/munin/munin.pem. The private key and certificate can be stored in the same file.
Affects: munin-update.

tls_certificate <value>
This directive sets the location of the TLS certificate to be used for TLS. Default
is /etc/munin/munin.pem. The private key and certificate can be stored in the same
file. Affects: munin-update.

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. Affects:
munin-update.

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. Affects:
munin-update.

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.
Affects: munin-update.

FIXME: This section MAY be complete, it may be missing a directive or two.

HOST DEFINITIONS

Host definitions can have several types. In all forms, the definition is used to generate
the host name and group for the host, and the following lines define its directives. All
following directives apply to that node until another node definition or EOF. Note that
when defining a nodename it is vital that you use a standard DNS name, as in, one that
uses only a-z, '-', and '.'. While other characters can be used in a DNS name, it is
against the RFC, and Munin uses the other characters as delimiters. If they appear in
nodenames, unexpected behavior may occur.

The simplest node definition defines the section for a new node by simply wrapping the DNS
name of the node in brackets, e.g. "[machine1.your.dom]". This will add the node
"machine1.your.dom" to the group "your.dom".

The next form of definition is used to define the node and group independently. It
follows the form "[your.dom;machine1.sub.your.dom]". This adds the node
"machine1.sub.your.dom" to the group "your.dom". This can be useful if you have machines
you want to put together as a group that are under different domains (as in the given
example). This can also solve a problem if your machine is "machine1.com", where having a
group of "com" makes little sense.

Multiple groups can be specified by adding more "groupname;"s, e.g.
"[servers;local;mail;mail.foo.net]", if you need a more hierarchical structure.

NODE DIRECTIVES

       These are directives that can follow a node definition and will apply only to that node.

       address <value>
           The IP address of the node.  Required.

       local_address <value>
           The local address to connect to the node from.  This overrides a group or global
           directive.

       FIXME: This section is incomplete.

PLUGIN DIRECTIVES

       These directives should appear after a node definition and are of the form
       "plugin.directive <value>".  Using these directives you can override various directives
       for a plugin, such as its contacts, and can also be used to create graphs containing data
       from other plugins.

       FIXME: This section is (obviously) incomplete.

FIELD DIRECTIVES

       These directives should appear after a node definition and are of the form "plugin.field
       <value>".  Using these directives you can override values originally set by plugins on the
       nodes, such as warning and critical levels or graph names.

       graph_height <value>
           The graph height for a specific service.  Default is 175.  Affects: munin-graph.

       graph_width <value>
           The graph width for a specific service.  Default is 400.  Affects: munin-graph.

       warning <value>
           The value at which munin-limits will mark the service as being in a warning state.
           Value can be a single number to specify a limit that must be passed or they can be a
           comma separated pair of numbers defining a valid range of values.  Affects: munin-
           limits.

       critical <value>
           The value at which munin-limits will mark the service as being in a critical state.
           Value can be a single number to specify a limit that must be passed or they can be a
           comma separated pair of numbers defining a valid range of values Affects: munin-
           limits.

       FIXME: This section is incomplete.

EXAMPLES

       On all the examples below, all the 'top-level' parameters (dbdir, logdir, htmldir,
       tmpldir) are not present. They are only skipped for brevity - they are needed.

EXAMPLE 1

       An example with three servers on two domains:

               [machine1.one.dom]
                       address machine1.one.dom

               [machine2.one.dom]
                       address 10.33.32.123

               [machine3.two.dom]
                       address localhost

       This will appear as two groups (one.dom and two.dom), having respectively two and one
       node.

EXAMPLE 2

       Summarize the 'load'-graphs of the two servers in one.dom, in a 'total load'-graph.

               [one.dom;Totals]
                       update no
                       load.graph_title Total load
                       load.sum_load.label load
                       load.sum_load.special_stack machine1=machine1.one.dom:load.load machine2=machine2.one.dom:load.load

AUTHORS

       Jimmy Olsen, Audun Ytterdal, Brian de Wolf, Nicolai Langfeldt

COPYRIGHT

       Copyright (C) 2002-2008 Audun Ytterdal, Jimmy Olsen, Nicolai Langfeldt, Linpro AS and
       others.

       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