Haproxy performs load balancing on redis

Implementation ideas:

Use two redis-servers as the backend, and then use haproxy as the Load balancer. configure a shell for health check on each redis-server machine, use xinetd to set the shell as a service listening port 9981 and manage it.

Haproxy performs health check through port 9981 on the redis-server machine. If the check fails, the redis-server will be removed and automatically added after recovery.

 

Haproxy. conf

global        maxconn 2#       debug        quiet        user zhxia        group zhxia        nbproc 1        log 127.0.0.1 local3        spread-checks 2defaults        timeout server  3s        timeout connect 3s        timeout client 60s        timeout http-request 3s        timeout queue 3sfrontend redis_read        bind 192.168.187.140:52020        default_backend cluster_redisbackend cluster_redis        mode tcp        option tcpka        balance static-rr        option httpchk        server  redis_01        192.168.180.101:6380    weight 1 check port 9981 inter 2s rise 2 fall 1        server  redis_02        192.168.180.101:6381    weight 1 check port 9981 inter 2s rise 2 fall 1

PS:

Check: Enable health check

Inter: Health Check Interval

Rise: the number of consecutive times the service is available.

Fall: consecutive times of service unavailability Detection

 

Install xinetd to manage services and monitor ports in a unified manner.

Chk_redis.sh

#!/bin/bash#===================================================================================#this script just for check the redis server if it alive#author:zhxia#date:2012-08-09#===================================================================================redis_host=192.168.180.101redis_port=6380redis_client=/usr/local/bin/redis-cliresult=`$redis_client -h $redis_host -p $redis_port -r 1 -i 1 'info' 2>/dev/null`if [ "$result" != "" ];then    echo -e "HTTP/1.1 200 OK\r\n"    echo -e "Content-Type: Content-Type: text/plain\r\n"    echo -e "\r\n"    echo -e "redis is running,listening port is:${redis_port}.\r\n"    echo -e "\r\n"else    echo -e "HTTP/1.1 503 Service Unavailable\r\n"    echo -e "Content-Type: Content-Type: text/plain\r\n"    echo -e "\r\n"    echo -e "redis is down! listen port is:${redis_port}"    echo -e "\r\n"fi

/Etc/xinetd. d/redischk

service redischk{    flags        = REUSE    protocol    = tcp    socket_type    = stream    port        = 9981    wait        = no    user        = haozu    server        = /home/haozu/bin/chk_redis.sh    log_on_failure +=USERID    disable        =no}

/Etc/services

# Local servicesredischk    9981/tcp