ubuntu snmp 配置
1. SNMP安装运行如下两个命令apt-get install snmp apt-get install snmpd 顺利运行完毕，使用如下命令测试一下lsof -i:161如果输出了正在运行snmp协议，便说明安装OK。2. SNMP配置（重点）我的SNMP配置文件/etc/snmp/snmpd.conf与网上早年的一些资料不同，主要是 压根没有出现com2sec，下面附上我的snmpd.conf的前半部分：-----------------------------------下面是snmpd.conf---------------------------------###############################################################################
#
# EXAMPLE.conf:
# An example configuration file for configuring the Net-SNMP agent ('snmpd')
# See the 'snmpd.conf(5)' man page for details
#
#Some entries are deliberately commented out, and will need to be explicitly activated
#
###############################################################################
#
#AGENT BEHAVIOUR
#
#Listen for connections from the local system only
#agentAddressudp:127.0.0.1:161
#Listen for connections on all interfaces (both IPv4 *and* IPv6)
agentAddress udp:161,udp6:[::1]:161
###############################################################################
#
#SNMPv3 AUTHENTICATION
#
#Note that these particular settings don't actually belong here.
#They should be copied to the file /var/lib/snmp/snmpd.conf
# and the passwords changed, before being uncommented in that file *only*.
#Then restart the agent
#createUser authOnlyUserMD5 "remember to change this password"
#createUser authPrivUserSHA "remember to change this one too"DES
#createUser internalUserMD5 "this is only ever used internally, but still change the password"
#If you also change the usernames (which might be sensible),
#then remember to update the other occurances in this example config file to match.
###############################################################################
#
#ACCESS CONTROL
#
#system + hrSystem groups only
view systemonlyincluded .1.3.6.1.2.1.1
view systemonlyincluded .1.3.6.1.2.1.25.1
view systemonlyincluded .1 80
#Full access from the local host
#rocommunity publiclocalhost
#Default access to basic system info
rocommunity publicdefault -V systemonly
#Full access from an example network
# Adjust this network address to match your local
# settings, change the community string,
# and check the 'agentAddress' setting above
#rocommunity secret10.0.0.0/16
#Full read-only access for SNMPv3
rouser authOnlyUser
#Full write access for encrypted requests
# Remember to activate the 'createUser' lines above
#rwuser authPrivUser priv
#It's no longer typically necessary to use the full 'com2sec/group/access' configuration
#ruser and rcommunity, together with suitable views, should cover most requirements
-----------------------------------上面是snmpd.conf---------------------------------
我的目的是进行远程SNMP连接，所以需要做如下的修改：
将下面这一行
agentAddress udp:127.0.0.1:161
注释掉，即
#agentAddress udp:127.0.0.1:161
然后将原来的这一行
#agentAddress udp:161,udp6:[::1]:161
去掉注释，即
agentAddress udp:161,udp6:[::1]:161
这样便可以实现snmp的远程监听了。
但修改后cacti服务器还是无法监测到CPU、内存、流量的数据，所以需要再做如下修改：
在snmpd.conf中找到下面的内容
view systemonlyincluded .1.3.6.1.2.1.1
view systemonlyincluded .1.3.6.1.2.1.25.1
在下面加上一行
view systemonlyincluded .1 80
这样就允许监听所有设备了。
完成所有修改后，重启snmp
service snmpd restart
本地测试SNMP是否监测各类指标的方法：运行如下命令
snmpwalk -v 2c -c public localhost
如果输出结果有好多页好多页，应该是设置成功了！
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