背景：学校里要对机房的所有服务器用摩卡软件进行监控，所以要在所有的服务器上安装和配置SNMP协议。
动机：我参考网上很多资料安装和配置SNMP，没搞定，于是自己研究了一下如何配置，最终顺利完成，所以分享一下。
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
root@Ouc:~# 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
#agentAddress udp: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 authOnlyUser MD5 “remember to change this password”
# createUser authPrivUser SHA “remember to change this one too” DES
# createUser internalUser MD5 “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 systemonly included .1.3.6.1.2.1.1
view systemonly included .1.3.6.1.2.1.25.1
view systemonly included .1 80
# Full access from the local host
#rocommunity public localhost
# Default access to basic system info
rocommunity public default -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 secret 10.0.0.0/16
# 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
# r[ou]user and r[ow]community, 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：
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