COLLECTD-SNMP(5) collectd COLLECTD-SNMP(5)
NAME
collectd-snmp - Documentation of collectd's "snmp plugin"
SYNOPSIS
LoadPlugin snmp
# ...
<Plugin snmp>
<Data "powerplus_voltge_input">
Table false
Type "voltage"
TypeInstance "input_line1"
Scale 0.1
Values "SNMPv2-SMI::enterprises.6050.5.4.1.1.2.1"
</Data>
<Data "hr_users">
Table false
Type "users"
Shift -1
Values "HOST-RESOURCES-MIB::hrSystemNumUsers.0"
</Data>
<Data "std_traffic">
Table true
Type "if_octets"
TypeInstanceOID "IF-MIB::ifDescr"
#FilterOID "IF-MIB::ifOperStatus"
#FilterValues "1", "2"
Values "IF-MIB::ifInOctets" "IF-MIB::ifOutOctets"
</Data>
<Host "some.switch.mydomain.org">
Address "192.168.0.2"
Version 1
Community "community_string"
Collect "std_traffic"
Interval 120
Timeout 10
Retries 1
</Host>
<Host "some.server.mydomain.org">
Address "192.168.0.42"
Version 2
Community "another_string"
Collect "std_traffic" "hr_users"
</Host>
<Host "secure.router.mydomain.org">
Address "192.168.0.7:165"
Version 3
SecurityLevel "authPriv"
Username "cosmo"
AuthProtocol "SHA"
AuthPassphrase "setec_astronomy"
PrivacyProtocol "AES"
PrivacyPassphrase "too_many_secrets"
Collect "std_traffic"
</Host>
<Host "some.ups.mydomain.org">
Address "tcp:192.168.0.3"
Version 1
Community "more_communities"
Collect "powerplus_voltge_input"
Interval 300
Timeout 5
Retries 5
</Host>
</Plugin>
DESCRIPTION
The "snmp plugin" queries other hosts using SNMP, the simple network
management protocol, and translates the value it receives to collectd's
internal format and dispatches them. Depending on the write plugins you
have loaded they may be written to disk or submitted to another
instance or whatever you configured.
Because querying a host via SNMP may produce a timeout the "complex
reads" polling method is used. The ReadThreads parameter in the main
configuration influences the number of parallel polling jobs which can
be undertaken. If you expect timeouts or some polling to take a long
time, you should increase this parameter. Note that other plugins also
use the same threads.
CONFIGURATION
Since the aim of the "snmp plugin" is to provide a generic interface to
SNMP, its configuration is not trivial and may take some time.
Since the "Net-SNMP" library is used you can use all the environment
variables that are interpreted by that package. See snmpcmd(1) for more
details.
There are two types of blocks that can be contained in the
"<Plugin snmp>" block: Data and Host:
The Data block
The Data block defines a list of values or a table of values that are
to be queried. The following options can be set:
Type type
collectd's type that is to be used, e. g. "if_octets" for interface
traffic or "users" for a user count. The types are read from the
TypesDB (see collectd.conf(5)), so you may want to check for which
types are defined. See types.db(5) for a description of the format
of this file.
Table true|false
Define if this is a single list of values or a table of values. The
difference is the following:
When Table is set to false, the OIDs given to Values (see below)
are queried using the "GET" SNMP command (see snmpget(1)) and
transmitted to collectd. One value list is dispatched and,
eventually, one file will be written.
When Table is set to true, the OIDs given to Values,
TypeInstanceOID, PluginInstanceOID, HostOID and FilterOID (see
below) are queried using the "GETNEXT" SNMP command until the
subtree is left. After all the lists (think: all columns of the
table) have been read several values sets will be dispatches and,
eventually, several files will be written. If you configure a Type
(see above) which needs more than one data source (for example
"if_octets" which needs "rx" and "tx") you will need to specify
more than one (two, in the example case) OIDs with the Values
option. This has nothing to do with the Table setting.
For example, if you want to query the number of users on a system,
you can use "HOST-RESOURCES-MIB::hrSystemNumUsers.0". This is one
value and belongs to one value list, therefore Table must be set to
false. Please note that, in this case, you have to include the
sequence number (zero in this case) in the OID.
Counter example: If you want to query the interface table provided
by the "IF-MIB", e. g. the bytes transmitted. There are potentially
many interfaces, so you will want to set Table to true. Because the
"if_octets" type needs two values, received and transmitted bytes,
you need to specify two OIDs in the Values setting, in this case
likely "IF-MIB::ifHCInOctets" and "IF-MIB::ifHCOutOctets". But,
this is because of the Type setting, not the Table setting.
Since the semantic of Instance and Values depends on this setting
you need to set it before setting them. Doing vice versa will
result in undefined behavior.
Plugin Plugin
Use Plugin as the plugin name of the values that are dispatched.
Defaults to "snmp".
PluginInstance Instance
Sets the plugin-instance of the values that are dispatched to
Instance value.
When Table is set to true and PluginInstanceOID is set then this
option has no effect.
Defaults to an empty string.
TypeInstance Instance
Sets the type-instance of the values that are dispatched to
Instance value.
When Table is set to true and TypeInstanceOID is set then this
option has no effect.
Defaults to an empty string.
TypeInstanceOID OID
PluginInstanceOID OID
HostOID OID
If Table is set to true, OID is interpreted as an SNMP-prefix that
will return a list of values. Those values are then used as the
actual type-instance, plugin-instance or host of dispatched
metrics. An example would be the "IF-MIB::ifDescr" subtree.
variables(5) from the SNMP distribution describes the format of
OIDs. When option is set to empty string, then "SUBID" will be used
as the value.
Prefix may be set for values with use of appropriate
TypeInstancePrefix, PluginInstancePrefix and HostPrefix options.
When Table is set to false these options has no effect.
Defaults: When no one of these options is configured explicitly,
TypeInstanceOID defaults to an empty string.
TypeInstancePrefix
PluginInstancePrefix
HostPrefix
These options are intented to be used together with
TypeInstanceOID, PluginInstanceOID and HostOID respectively.
If set, String is preprended to values received by querying the
agent.
When Table is set to false these options has no effect.
The "UPS-MIB" is an example where you need this setting: It has
voltages of the inlets, outlets and the battery of an UPS. However,
it doesn't provide a descriptive column for these voltages. In this
case having 1, 2, ... as instances is not enough, because the inlet
voltages and outlet voltages may both have the subids 1, 2, ... You
can use this setting to distinguish between the different voltages.
Instance Instance
Attention: this option exists for backwards compatibility only and
will be removed in next major release. Please use TypeInstance /
TypeInstanceOID instead.
The meaning of this setting depends on whether Table is set to true
or false.
If Table is set to true, option behaves as TypeInstanceOID. If
Table is set to false, option behaves as TypeInstance.
Note what Table option must be set before setting Instance.
InstancePrefix String
Attention: this option exists for backwards compatibility only and
will be removed in next major release. Please use
TypeInstancePrefix instead.
Values OID [OID ...]
Configures the values to be queried from the SNMP host. The meaning
slightly changes with the Table setting. variables(5) from the SNMP
distribution describes the format of OIDs.
If Table is set to true, each OID must be the prefix of all the
values to query, e. g. "IF-MIB::ifInOctets" for all the counters of
incoming traffic. This subtree is walked (using "GETNEXT") until a
value from outside the subtree is returned.
If Table is set to false, each OID must be the OID of exactly one
value, e. g. "IF-MIB::ifInOctets.3" for the third counter of
incoming traffic.
Scale Value
The gauge-values returned by the SNMP-agent are multiplied by
Value. This is useful when values are transferred as a fixed point
real number. For example, thermometers may transfer 243 but
actually mean 24.3, so you can specify a scale value of 0.1 to
correct this. The default value is, of course, 1.0.
This value is not applied to counter-values.
Shift Value
Value is added to gauge-values returned by the SNMP-agent after
they have been multiplied by any Scale value. If, for example, a
thermometer returns degrees Kelvin you could specify a shift of
273.15 here to store values in degrees Celsius. The default value
is, of course, 0.0.
This value is not applied to counter-values.
Ignore Value [, Value ...]
The ignore values allows one to ignore TypeInstances based on their
name and the patterns specified by the various values you've
entered. The match is a glob-type shell matching.
When Table is set to false then this option has no effect.
InvertMatch true|false(default)
The invertmatch value should be use in combination of the Ignore
option. It changes the behaviour of the Ignore option, from a
blacklist behaviour when InvertMatch is set to false, to a
whitelist when specified to true.
FilterOID OID
FilterValues Value [, Value ...]
FilterIgnoreSelected true|false(default)
When Table is set to true, these options allow to configure
filtering based on MIB values.
The FilterOID declares OID to fill table column with values. The
FilterValues declares values list to do match. Whether table row
will be collected or ignored depends on the FilterIgnoreSelected
setting. As with other plugins that use the daemon's ignorelist
functionality, a string that starts and ends with a slash is
interpreted as a regular expression.
If no selection is configured at all, all table rows are selected.
When Table is set to false then these options has no effect.
See Table and /"IGNORELISTS" for details.
The Host block
The Host block defines which hosts to query, which SNMP community and
version to use and which of the defined Data to query.
The argument passed to the Host block is used as the hostname in the
data stored by collectd.
Address IP-Address|Hostname
Set the address to connect to. Address may include transport
specifier and/or port number.
Version 1|2|3
Set the SNMP version to use. When giving 2 version "2c" is actually
used.
Community Community
Pass Community to the host. (Ignored for SNMPv3).
Username Username
Sets the Username to use for SNMPv3 security.
SecurityLevel authPriv|authNoPriv|noAuthNoPriv
Selects the security level for SNMPv3 security.
Context Context
Sets the Context for SNMPv3 security.
AuthProtocol MD5|SHA
Selects the authentication protocol for SNMPv3 security.
AuthPassphrase Passphrase
Sets the authentication passphrase for SNMPv3 security.
PrivacyProtocol AES|DES
Selects the privacy (encryption) protocol for SNMPv3 security.
PrivacyPassphrase Passphrase
Sets the privacy (encryption) passphrase for SNMPv3 security.
Collect Data [Data ...]
Defines which values to collect. Data refers to one of the Data
block above. Since the config file is read top-down you need to
define the data before using it here.
Interval Seconds
Collect data from this host every Seconds seconds. This option is
meant for devices with not much CPU power, e. g. network equipment
such as switches, embedded devices, rack monitoring systems and so
on. Since the Step of generated RRD files depends on this setting
it's wise to select a reasonable value once and never change it.
Timeout Seconds
How long to wait for a response. The "Net-SNMP" library default is
1 second.
Retries Integer
The number of times that a query should be retried after the
Timeout expires. The "Net-SNMP" library default is 5.
BulkSize Integer
Configures the size of SNMP bulk transfers. The default is 0, which
disables bulk transfers altogether.
SEE ALSO
collectd(1), collectd.conf(5), snmpget(1), snmpgetnext(1),
variables(5), unix(7)
AUTHORS
Florian Forster <octo AT collectd.org> Michael Pilat <mike AT mikepilat.com>
5.9.1.599.gbb5cfbc 2020-03-08 COLLECTD-SNMP(5)
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