接收SNMP資料

安裝SNMP Fluentd Plugin

gem install fluent-plugin-snmp

設定檔

test.conf設定檔案如下：

<source>
  type snmp
  tag snmp.server1
  nodes name, value
  host localhost
  community idv90we3rnov90wer # 這是config檔案中的community的設定
  mib sysContact.0, sysDescr.0, sysName.0
  method_type get
  polling_time 5
  polling_type async_run
</source>
<match snmp.server*>
  type stdout
</match>

snmp config

在資料擷取前，需要在主機上設定相對應的snmp config，以便把相關資訊提供給fluentd抓取...

# snmp.conf設定檔案如下：
# Map 'idv90we3rnov90wer' community to the 'ConfigUser'
# Map '209ijvfwer0df92jd' community to the 'AllUser'
#       sec.name        source          community
com2sec ConfigUser      default         idv90we3rnov90wer
com2sec AllUser         default         209ijvfwer0df92jd

# Map 'ConfigUser' to 'ConfigGroup' for SNMP Version 2c
# Map 'AllUser' to 'AllGroup' for SNMP Version 2c
#                       sec.model       sec.name
group   ConfigGroup     v2c             ConfigUser
group   AllGroup        v2c             AllUser

# Define 'SystemView', which includes everything under .1.3.6.1.2.1.1 (or .1.3.6.1.2.1.25.1)
# Define 'AllView', which includes everything under .1
#                       incl/excl       subtree
view    SystemView      included        .1.3.6.1.2.1.1
view    SystemView      included        .1.3.6.1.2.1.25.1.1
view    AllView         included        .1

# Give 'ConfigGroup' read access to objects in the view 'SystemView'
# Give 'AllGroup' read access to objects in the view 'AllView'
#                       context model   level   prefix  read            write   notify
access  ConfigGroup     ""      any     noauth  exact   SystemView      none    none
access  AllGroup        ""      any     noauth  exact   AllView         none    none

以CPU load為例

首先，在snmp設定檔中設定cpu load average的mib設定。

參考：http://www.debianadmin.com/linux-snmp-oids-for-cpumemory-and-disk-statistics.html

# vim /etc/snmp/snmpd.conf
(skip)
1 minute Load: .1.3.6.1.4.1.2021.10.1.3.1
5 minute Load: .1.3.6.1.4.1.2021.10.1.3.2
15 minute Load: .1.3.6.1.4.1.2021.10.1.3.3
(skip)

接著，可以到fluentd設定檔中設定抓取該snmp資訊：

<source>
  type snmp
  tag snmp.server1
  nodes name, value
  host test-centos6
  community 209ijvfwer0df92jd # <-- 這是config檔案中的community的設定
  mib laLoad.1, laLoad.2, laLoad.3
  mib_modules UCD-SNMP-MIB
  method_type get
  polling_time 5
  polling_type async_run
</source>
<match snmp.server*>
  type stdout
</match>

以上面設定為例，所顯示的stdout如下：

2015-07-07 13:54:25 +0000 snmp.server1: {"name":"UCD-SNMP-MIB::laLoad.1","value":0.0}
2015-07-07 13:54:25 +0000 snmp.server1: {"name":"UCD-SNMP-MIB::laLoad.2","value":0.02}
2015-07-07 13:54:25 +0000 snmp.server1: {"name":"UCD-SNMP-MIB::laLoad.3","value":0.0}
2015-07-07 13:54:30 +0000 snmp.server1: {"name":"UCD-SNMP-MIB::laLoad.1","value":0.0}
2015-07-07 13:54:30 +0000 snmp.server1: {"name":"UCD-SNMP-MIB::laLoad.2","value":0.02}