cacti 监控linux TCP端口连接数

转载、服务器
原文出处：http://blog.chinaunix.net/uid-24499216-id-2602964.html
个人心得：
我的cacti版本是 0.8.8a按照原文的说法要改hash的值才能将模板导入成功，其实我没有改 也成功改入了。
脚本webconn.sh 中的ip地址和端口可以改成自己的，别忘记了
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今天动手做了个监控nginx连接数的模板：
修改被监控端snmpd.conf,在最后增加一行：
[root@localhost ~]# vim /etc/snmp/snmpd.conf
extend .1.3.6.1.4.1.2021.21 webconn /bin/bash /etc/snmp/webconn.sh
再在/etc/snmp下创建获取端口连接数的脚本webconn.sh
#!/bin/sh
#If more than one IP or port Please '|' separated
ip="58.251.1.2|119.145.1.2" #我们服务器是双线接入，所以有2个IP
port="80|443" #我这里是监控80和443端口
webconn=`netstat -nt |grep ESTABLISHED |awk '{print $4}'|awk '/('$ip'):('$port')/'| wc -l`
websyn=`netstat -nt |grep SYN_RECV |awk '{print $4}'|awk '/('$ip'):('$port')/'| wc -l`
weback=`netstat -nt |grep LAST_ACK |awk '{print $4}'|awk '/('$ip'):('$port')/'| wc -l`
webwait=`netstat -nt |grep TIME_WAI |awk '{print $4}'|awk '/('$ip'):('$port')/'| wc -l`
echo $webconn
echo $websyn
echo $weback
echo $webwait
再赋予脚本可执行权限
[root@localhost ~]# chmod a+x /etc/snmp/webconn.sh
[root@localhost ~]# service snmpd restart
接下来在cacti上验证看能否通过snmp抓取到客户端的数据：
[root@monitor ~]# snmpwalk -v 2c -c public 172.16.88.10 .1.3.6.1.4.1.2021.21
UCD-SNMP-MIB::ucdavis.21.1.0 = INTEGER: 1
UCD-SNMP-MIB::ucdavis.21.2.1.2.7.119.101.98.99.111.110.110 = STRING: "/bin/bash"
UCD-SNMP-MIB::ucdavis.21.2.1.3.7.119.101.98.99.111.110.110 = STRING: "/etc/snmp/webconn.sh"
UCD-SNMP-MIB::ucdavis.21.2.1.4.7.119.101.98.99.111.110.110 = ""
UCD-SNMP-MIB::ucdavis.21.2.1.5.7.119.101.98.99.111.110.110 = INTEGER: 5
UCD-SNMP-MIB::ucdavis.21.2.1.6.7.119.101.98.99.111.110.110 = INTEGER: 1
UCD-SNMP-MIB::ucdavis.21.2.1.7.7.119.101.98.99.111.110.110 = INTEGER: 1
UCD-SNMP-MIB::ucdavis.21.2.1.20.7.119.101.98.99.111.110.110 = INTEGER: 4
UCD-SNMP-MIB::ucdavis.21.2.1.21.7.119.101.98.99.111.110.110 = INTEGER: 1
UCD-SNMP-MIB::ucdavis.21.3.1.1.7.119.101.98.99.111.110.110 = STRING: "221"
UCD-SNMP-MIB::ucdavis.21.3.1.2.7.119.101.98.99.111.110.110 = STRING: "221
16
1
19"
UCD-SNMP-MIB::ucdavis.21.3.1.3.7.119.101.98.99.111.110.110 = INTEGER: 4
UCD-SNMP-MIB::ucdavis.21.3.1.4.7.119.101.98.99.111.110.110 = INTEGER: 0
UCD-SNMP-MIB::ucdavis.21.4.1.2.7.119.101.98.99.111.110.110.1 = STRING: "221"
UCD-SNMP-MIB::ucdavis.21.4.1.2.7.119.101.98.99.111.110.110.2 = STRING: "16"
UCD-SNMP-MIB::ucdavis.21.4.1.2.7.119.101.98.99.111.110.110.3 = STRING: "1"
UCD-SNMP-MIB::ucdavis.21.4.1.2.7.119.101.98.99.111.110.110.4 = STRING: "19"
若有上面的输出则说明成功了，接下来就只要建cacti的模板了，这里就不讲建立模板的过程了，我已经把模板导出来，有需要可下载附件包含模板和脚本
另外我的cacti是0.8.7f的，不同版本模板的hash值不一样，所以非0.8.7f版本的cacti导入此模板会报错，不过可将模板里的0020全部替换成你所用版本的 hash值就可以解决，下面是每个版本对应的hash值：
1. "0.8.4" => "0000",
2. "0.8.5" => "0001",
3. "0.8.5a" => "0002",
4. "0.8.6" => "0003",
5. "0.8.6a" => "0004",
6. "0.8.6b" => "0005",
7. "0.8.6c" => "0006",
8. "0.8.6d" => "0007",
9. "0.8.6e" => "0008",
10. "0.8.6f" => "0009",
11. "0.8.6g" => "0010",
12. "0.8.6h" => "0011",
13. "0.8.6i" => "0012",
14. "0.8.6j" => "0013",
15. "0.8.7" => "0014",
16. "0.8.7a" => "0015",
17. "0.8.7b" => "0016",
18. "0.8.7c" => "0017",
19. "0.8.7d" => "0018"
20. "0.8.7e" => "0019"
21. "0.8.7f" => "0020"


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