Freebsd下安装snmp教程。要用到cacti通过net-snmp监控各个服务器的运行情况，这样要为每一台服务器安装snmp，虽然安装比较简单，还是偷偷懒写个脚本吧，CentOS下安装要换用yum来安装了。

#!/bin/sh
SNMPD_CONF_DIR=/usr/local/share/snmp

if [ -f '/usr/local/sbin/snmpd' ]
then
echo ‘snmpd already installed!’
else
cd /usr/ports/net-mgmt/net-snmp
echo “Installing…”
make install > /dev/null
cd ~/manage_tools
echo “Setting…”
sleep 3
cat <<EOF > snmpd.conf
syslocation beijing
syscontact jiangjian <jianzi0307@gmail.com>
sysservices 77
rocommunity jiangjian
load 12 12 12
EOF
mv snmpd.conf $SNMPD_CONF_DIR

cat <<EOF > snmpd.start
#!/bin/sh
/usr/local/sbin/snmpd
EOF

cat <<EOF > snmpd.stop
#!/bin/sh
killall snmpd
EOF

chmod a+x snmpd.start snmpd.stop

#run snmpd
echo “Run snmpd…”
sleep 3
/bin/sh snmpd.start
echo ok!
fi

另：用cacti监控Mysql的方法：
a> 下载Cacti监控Mysql所需要的脚本和模版,按下面步骤来
# wget http://www.faemalia.net/mysqlUtils/teMySQLcacti-20060810.tar.gz
# cd /data/src/teMySQLcacti
# ./convertXmlTo5minutePollingInterval.sh

These graphs assume a 1-minute Poller cron frequency! If you use the default 5-minute interval, run convertXmlTo5minutePollingInterval.sh, which will make a step=300, heartbeat=600 version of the XML file for you to import.

# cp mysql_stats.php /data/cacti/scripts/
# cp dumpMemcachedStats.php /data/cacti/scripts/ 这个脚本貌似是监控memcached的，刚好用到！

在cacti管理界面导入cacti_host_template_temysql_host-step300-heartbeat600.xml 与cacti_host_template_memcached_host-step300-heartbeat600.xml模板文件。

在被监控机的msql数据库服务器需要加入监控机的操作权限：
mysql> grant process,super on *.* to ‘cacti’@’cacti server ip’ identified by ‘password’;

貌似只需要process权限即可。

by the way:安全手则说不许将process或super权限付给非管理用户，该mysqladmin processlist可以列举出当前执行的查询文本；super权限可用于切断客户端连接、改变服务器运行参数状态、控制拷贝复制数据库的服务器；