zabbix如何监控tcp连接数

Posted 2020-07-12

参考http://john88wang.blog.51cto.com/2165294/1586234/

tcp各个状态的意思：

ESTABLISHED       socket已经建立连接

CLOSED            socket没有被使用，无连接

CLOSING           服务器端和客户端都同时关闭连接

CLOSE_WAIT        等待关闭连接

TIME_WAIT         The socket is waiting after close to handle packets still in the network. 表示收到了对方的FIN报文，并发送出了ACK报文，等待2MSL后就可回到CLOSED状态

LAST_ACK          The remote end has shut down, and the socket is closed. Waiting for acknowledgement. 远端关闭，当前socket被动关闭后发送FIN报文，等待对方ACK报文

LISTEN            监听状态

SYN_RECV          接收到SYN报文

SYN_SENT          已经发送SYN报文

FIN_WAIT1         The socket is closed, and the connection is shutting down

FIN_WAIT2          Connection is closed, and the socket is waiting for a shutdown from the remote end.

1 搭建环境：

zabbix server :centos 6  ip 192.168.234.134 

 zabbix client (nginx) :centos 7  ip:192.168.234.133 

2 监控方法：

第一种监控方法用ss

/usr/sbin/ss state all | awk ‘{++S[$1]} END {for (a in S) {printf "%11-s %s\n",a,S[a]}}‘
LISTEN      9
ESTAB       1
State       1
TIME-WAIT   110

第二种监控方法用netstat

/bin/netstat -an|awk ‘/^tcp/{++S[$NF]}END{for(a in S) print a,S[a]}‘
LISTEN 9
ESTABLISHED 1
SYN_SENT 1
TIME_WAIT 126

3 监控脚本编写

vi /usr/local/zabbix/scripts/tcp.sh

#!/bin/bash
#this script is used to get tcp and udp connetion status
#tcp status
metric=$1
tmp_file=/tmp/tcp_status.txt
/bin/netstat -an|awk ‘/^tcp/{++S[$NF]}END{for(a in S) print a,S[a]}‘ > $tmp_file
case $metric in
   closed)
          output=$(awk ‘/CLOSED/{print $2}‘ $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   listen)
          output=$(awk ‘/LISTEN/{print $2}‘ $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   synrecv)
          output=$(awk ‘/SYN_RECV/{print $2}‘ $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   synsent)
          output=$(awk ‘/SYN_SENT/{print $2}‘ $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   established)
          output=$(awk ‘/ESTABLISHED/{print $2}‘ $tmp_file)
          if [ "$output" == "" ];then
             echo 0
          else
             echo $output
          fi
        ;;
   timewait)

4添加zabbix客户端配置文件

vi /usr/local/zabbix/etc/zabbix_agentd.conf 添加
UserParameter=tcp.status[*],/usr/local/zabbix/scripts/tcp.sh $1

然后重启agentd服务

5 测试链接

zabbix_get -s 192.168.234.133 -p 10055 -k tcp.status[timewait]

6 倒入模板，确认出图

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