#前提
・CentOSでsnmpをしゃべらせてみたいなと思ったとき
　最低限これだけすればできるとというものをまとめてみた
・アカウントはすべて管理者としています

#インストールするもの

コマンド

# yum -y install net-snmp net-snmp-utils

#/etc/snmp/snmpd.confを以下のように記載

confの中身

 15 ###############################################################################
 16 # Access Control
 17 ###############################################################################
 18
 19 # As shipped, the snmpd demon will only respond to queries on the
 20 # system mib group until this file is replaced or modified for
 21 # security purposes.  Examples are shown below about how to increase the
 22 # level of access.
 23
 24 # By far, the most common question I get about the agent is "why won't
 25 # it work?", when really it should be "how do I configure the agent to
 26 # allow me to access it?"
 27 #
 28 # By default, the agent responds to the "public" community for read
 29 # only access, if run out of the box without any configuration file in
 30 # place.  The following examples show you other ways of configuring
 31 # the agent so that you can change the community names, and give
 32 # yourself write access to the mib tree as well.
 33 #
 34 # For more information, read the FAQ as well as the snmpd.conf(5)
 35 # manual page.
 36
 37 ####
 38 # First, map the community name "public" into a "security name"
 39
 40 #       sec.name  source          community
 41 com2sec local  default       home_public
 42
 43 ####
 44 # Second, map the security name into a group name:
 45
 46 #       groupName      securityModel securityName
 47 group   local_group v1           local
 48 group   local_group v2c           local
 49
 50 ####
 51 # Third, create a view for us to let the group have rights to:
 52
 53 # Make at least  snmpwalk -v 1 localhost -c public system fast again.
 54 #       name           incl/excl     subtree         mask(optional)
 55 view    view_all    included   .1
 56
 57 ####
 58 # Finally, grant the group read-only access to the systemview view.
 59
 60 #       group          context sec.model sec.level prefix read   write  notif
 61 access  local_group ""      any       noauth    exact  view_all none none
 62
 63 # -----------------------------------------------------------------------------

41、47、48、55、61行目をそのままコピペでOK
※各項目は後日説明したいかと思う

#コマンド実行

qiita.rb

# service snmpd start
# service snmpd status

#snmpwalkで値が帰ってくるか確認
出力結果が文字列と数字の混在

コマンド

# snmpwalk -c home_public -v2c localhost .1

出力結果がOID

コマンド

# snmpwalk -On -c home_public -v2c localhost .1

#参考サイト
Net-SNMP のインストールと設定〜 CentOS6