MUNIN.CONF(5) Munin Documentation MUNIN.CONF(5)
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.
ssh_command value
The name of the secure shell command to use. Can be fully
qualified, or looked up in $PATH. Default: "ssh"
ssh_options value
The "ssh" command line options. Defaults: "-o
ChallengeResponseAuthentication=no -o StrictHostKeyChecking=no".
If you need per-host ssh configuration, add these to
~/munin/.ssh/config
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
SEE ALSO
For more information, see the man pages of the individual munin-*
programs or the Munin homepage <http://munin-monitoring.org/>.
2.0.63 2020-06-08 MUNIN.CONF(5)