redis的session清理

(1)统计redis连接信息

echo 'client list' | /apps/svr/redis/bin/redis-cli -h 127.0.0.1 -p 6379 |awk '{print $1}' | awk -F '[=,:]' '{print $2}' | sort -n | uniq -c |sort -nr

(2)当redis连接满了，client list都没法执行，那么是用netsta命令查看。

netstat  -na| grep 6379  | awk '{print $5}' | awk -F":" '{print $1}' |  sort  | uniq -c

(3)当redis实例cpu较高的时间，捕获redis正在执行的命令

#!/user/bin/env bash

port=$1

rpid=`ps aux | grep redis-server| grep -v grep | grep $port | awk '{print $2}'`

for((;;))
do
        mon=`top -c -b -n 1 -p $rpid | tail -2|grep -Ev "^$"|awk '{if($9 > 15) print 1;else print 0}'`

        if [ $mon = 1 ]
        then     
                /apps/svr/redis/bin/redis-cli -h 127.0.0.1 -p $port monitor > /tmp/$port.txt & 

                echo 'client list'|/apps/svr/redis/bin/redis-cli -h 127.0.0.1 -p $port > /tmp/$port'_client'.txt 

                sleep 1
                ps aux | grep redis | grep -v 'grep' |grep 'redis-cli' | grep 'monitor' | grep $port | awk '{print $2}' | xargs kill  -s 9
                exit 
        fi

        sleep 0.5
done

改进：

#!/usr/bin/env bash

port=$1
# get the pid of redis-server of specified port
rpid=`ps aux | grep redis-server| grep -v grep | grep $port | awk '{print $2}'`

#when cpu usage is greater than 50%,begin to catch the redis query log by using the redis MONITOR command
mon=`top -c -b -n 1 -p $rpid | tail -2|grep -Ev "^$"|awk '{if($9 > 50) print 1;else print 0}'`

if [ $mon = 1 ]
then
        /apps/svr/redis/bin/redis-cli -h 127.0.0.1 -p $port monitor > /tmp/$port.txt &;

        mpid=$!
        sleep 3
        # killing  the subprocess and exit
        kill $mpid
        exit
fi