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NET-SNMP 是一種開放原始碼的簡單網路管理協議（Simple Network Management Protocol）軟體。
NET-SNMP支持SNMP v1, SNMP v2c 與 SNMP v3，並可以使用 IPV4 及 IPV6 。
基於(BSD及BSD like)許可。
【CentOS 5.x 安裝】
步驟一：
防火牆請打開
161:udp, 162:udp
檢查 SNMP 套件是否安裝
[root@localhost ~]# -qa | grep net-snmp 利用 yum 安裝 SNMP 套件
[root@localhost ~]# yum -y install net-snmp net-snmp-utils
調整 snmp 設定檔
[root@localhost ~]# vi /etc/snmp/snmpd.conf
# sec.name source community
com2sec local localhost private
com2sec local 127.0.0.1 public
com2sec notConfigUser 10.2.2.0/24 public
####
# Second, map the security names into group names:
#
sec.model sec.name
group notConfigGroup v1 notConfigUser
group notConfigGroup v2c notConfigUser
####
# Third, create a view for us to let the groups have rights to:
# incl/excl
subtree mask
view all included .1 80
#.iso.org.dod.internet.mgmt.mib-2
view systemview included .1.3.6.1.2.1
#System Uptime
view systemview included .1.3.6.1.2.1.1.3.0
#number of passive TCP connections
view systemview included .1.3.6.1.2.1.6.6.0
#Open TCP connections failures
#view systemview included .1.3.6.1.2.1.6.7.0
#Open TCP connections
view systemview included .1.3.6.1.2.1.6.9.0
#----------- Memory Statistics:
#Total Swap Size
#view systemview included .1.3.6.1.4.1.2021.4.3.0
#Available Swap Space
#view systemview included .1.3.6.1.4.1.2021.4.4.0
#Total RAM in machine
#view systemview included .1.3.6.1.4.1.2021.4.5.0
#Total RAM used
view systemview included .1.3.6.1.4.1.2021.4.6.0
#Total RAM Free
view systemview included .1.3.6.1.4.1.2021.4.11.0
#Total RAM Shared: .1.3.6.1.4.1.2021.4.13.0
#Total RAM Buffered: .1.3.6.1.4.1.2021.4.14.0
#Total Cached Memory: .1.3.6.1.4.1.2021.4.15.0
#----------- Disk Statistics
#Path where the disk is mounted
#view systemview included .1.3.6.1.4.1.2021.9.1.2.1
#Path of the device for the partition
#view systemview included .1.3.6.1.4.1.2021.9.1.3.1
#Total size of the disk/partion (kBytes)
#view systemview included .1.3.6.1.4.1.2021.9.1.6.1
#Available space on the disk
#view systemview included .1.3.6.1.4.1.2021.9.1.7.1
#Used space on the disk
#view systemview included .1.3.6.1.4.1.2021.9.1.8.1
#Percentage of space used on disk
#view systemview included .1.3.6.1.4.1.2021.9.1.9.1
#Percentage of inodes used on disk
#view systemview included .1.3.6.1.4.1.2021.9.1.10.1
#----------- CPU Statistics
#1 minute Load
view systemview included .1.3.6.1.4.1.2021.10.1.3.1
#5 minute Load
#view systemview included .1.3.6.1.4.1.2021.10.1.3.2
#15 minute Load
#view systemview included .1.3.6.1.4.1.2021.10.1.3.3
#percentage of user CPU time:
view systemview included .1.3.6.1.4.1.2021.11.9.0
#percentages of system CPU time
#view systemview included .1.3.6.1.4.1.2021.11.10.0
#percentages of idle CPU time
#view systemview included .1.3.6.1.4.1.2021.11.11.0
#raw user CPU time
#view systemview included .1.3.6.1.4.1.2021.11.50.0
#raw nice cpu time
#view systemview included .1.3.6.1.4.1.2021.11.51.0
#raw system CPU time
#view systemview included .1.3.6.1.4.1.2021.11.52.0
#raw idle cpu time
#view systemview included .1.3.6.1.4.1.2021.11.53.0
####
# Finally, grant the 2 groups access to the 1 view with different
# write permissions:
#
context sec.model sec.level match read write notif
access notConfigGroup "" any noauth exact systemview none none
access local "" any noauth exact all none none
#access MyROGroup "" any noauth 0 all none none
#access MyRWGroup "" any noauth 0 all all all
syslocation CentOS 5.5 at S21 Taipei
syscontact Root <root@localhost>
disk / 10000
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啟用 SNMP Service
[root@localhost ~]# service snmpd start
使用 snmpwalk 工具檢查 SNMP Service 是否安裝完成
[root@localhost ~]#
snmpwalk -c public -v 1 localhost system
使用 snmptranslate 工具取得 OID 資料
snmptranslate -Tp 1.3.6.1.2.1
SNMP 常用 OID
http://wangchengtai.blog.hexun.com.tw/37652599_d.html
SNMP 常用 Linux OID
http://hi.baidu.com/qu6zhi/blog/item/e2f11ac809391d1a7e3e6f6d.html
OID 1.3.6.1.2.1 內容表
http://www.alvestrand.no/objectid/1.3.6.1.2.1.html
SCALAR Objects for linux(OID List)
http://www.mibdepot.com/engine/linux_SCALAR.html
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