HAProxy MySQL负载均衡

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i /etc/services

mysqlcheck      6033/tcp                        # MySQL status check

2. 使用xinetd守护进程运行MySQL状态检测
# cat /etc/xinetd.d/mysqlchk

service mysqlcheck
{
        disable         = no
        flags           = REUSE
        socket_type     = stream
        port            = 6033
        wait            = no
        user            = root
        server          = /usr/local/haproxy/sbin/mysqlchk_status.sh
        log_on_failure  += USERID
}

3. 状态检测脚本
# vi /usr/local/haproxy/sbin/mysqlchk_status.sh

#/bin/bash 
MYSQL_HOST="localhost"
MYSQL_PORT="3306"
MYSQL_USERNAME="root"
MYSQL_PASSWORD="123456"
 
ERROR_MSG=/usr/bin/mysql --host=$MYSQL_HOST --port=$MYSQL_PORT --user=$MYSQL_USERNAME --password=$MYSQL_PASSWORD -e "show databases;"
 
if [ "$ERROR_MSG" != "" ]
then
        # mysql is fine, return http 200
        /bin/echo -e "HTTP/1.1 200 OK\r\n"
        /bin/echo -e "Content-Type: Content-Type: text/plain\r\n"
        /bin/echo -e "\r\n"
        /bin/echo -e "MySQL is running.\r\n"
        /bin/echo -e "\r\n"
else
        # mysql is fine, return http 503
        /bin/echo -e "HTTP/1.1 503 Service Unavailable\r\n"
        /bin/echo -e "Content-Type: Content-Type: text/plain\r\n"
        /bin/echo -e "\r\n"
        /bin/echo -e "MySQL is *down*.\r\n"
        /bin/echo -e "\r\n"
fi

# chown haproxy.haproxy /usr/local/haproxy/sbin/mysqlchk_status.sh

4. HAproxy日志
# touch /var/log/haproxy.log
# chown haproxy.haproxy /var/log/haproxy.log
编辑/etc/syslog.conf文件，添加如下语句

local0.*                                                /var/log/haproxy.log

5. HAProxy配置文件
[root@localhost htdocs]# cat /usr/local/haproxy/conf/haproxy.conf

global
        maxconn 4096
        daemon
        pidfile /usr/local/haproxy/run/haproxy.pid
        #debug
        #quiet
        user haproxy
        group haproxy
 
defaults
        log     global
        mode    http
        option  httplog
        option  dontlognull
        log 127.0.0.1 local0
        retries 3
        option redispatch
        maxconn 2000
        contimeout      5000
        clitimeout      50000
        srvtimeout      50000
 
listen  admin_stats 192.168.0.1:80
        mode        http
        stats uri   /dbs
        stats realm     Global\ statistics
        stats auth  test:123456
 
listen  proxy-mysql 0.0.0.0:23306
        mode tcp
        balance roundrobin
        option httpchk OPTIONS * HTTP/1.1\r\nHost:\ www
        server db01 192.168.0.1:3306 weight 1 check port 6033 inter 1s rise 2 fall 2
        server db02 192.168.0.2:3306 weight 1 check port 6033 inter 1s rise 2 fall 2
        option tcpka

6. HAProxy启动脚本
# cat /etc/init.d/haproxy

#! /bin/sh
set -e
 
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/haproxy/sbin
PROGDIR=/usr/local/haproxy
PROGNAME=haproxy
DAEMON=$PROGDIR/sbin/$PROGNAME
CONFIG=$PROGDIR/conf/$PROGNAME.conf
PIDFILE=$PROGDIR/run/$PROGNAME.pid
DESC="HAProxy daemon"
SCRIPTNAME=/etc/init.d/$PROGNAME
 
# Gracefully exit if the package has been removed.
test -x $DAEMON || exit 0
 
start()
{
        echo -n "Starting $DESC: $PROGNAME"
        $DAEMON -f $CONFIG
        echo "."
}
 
stop()
{
        echo -n "Stopping $DESC: $PROGNAME"
        haproxy_pid=cat $PIDFILE
        kill $haproxy_pid
        echo "."
}
 
restart()
{
        echo -n "Restarting $DESC: $PROGNAME"
        $DAEMON -f $CONFIG -p $PIDFILE -sf $(cat $PIDFILE)
        echo "."
}
 
case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart)
        restart
        ;;
  *)
        echo "Usage: $SCRIPTNAME {start|stop|restart}" >&2
        exit 1
        ;;
esac
 
exit 0