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mysql负载均衡怎么做 数据库做负载均衡( 六 )

IT技术系统


# vi
/etc/servicesmysqlcheck
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 [ "$ERROR_MSG" != "" ]
then
# mysql is fine, return http 200
/bin/echo -e "HTTP/1.1 200 OK\r\n"
/bin/echo -e "Content-Type: Content-Type: text/plain\r\n"
/bin/echo -e "\r\n"
/bin/echo -e "MySQL is running.\r\n"
/bin/echo -e "\r\n"
else
# mysql is fine, return http 503
/bin/echo -e "HTTP/1.1 503 Service Unavailable\r\n"
/bin/echo -e "Content-Type: Content-Type: text/plain\r\n"
/bin/echo -e "\r\n"
/bin/echo -e "MySQL is *down*.\r\n"
/bin/echo -e "\r\n"
fi
# chown haproxy.haproxy /usr/local/haproxy/sbin/mysqlchk_status.sh
4. HAproxy日志
# touch /var/log/haproxy.log
# chown haproxy.haproxy /var/log/haproxy.log
编辑/etc/syslog.conf文件，添加如下语句
local0.*/var/log/haproxy.log
5. HAProxy配置文件
[root@localhost htdocs]# cat /usr/local/haproxy/conf/haproxy.conf
global
maxconn 4096
daemon
pidfile /usr/local/haproxy/run/haproxy.pid
#debug
#quiet
user haproxy
group haproxy
defaults
logglobal
modehttp
optionhttplog
optiondontlognull
log 127.0.0.1 local0
retries 3
option redispatch
maxconn 2000
contimeout5000
clitimeout50000
srvtimeout50000
listenadmin_stats 192.168.0.1:80
modehttp
stats uri/dbs
stats realmGlobal\ statistics
stats authtest:123456
listenproxy-mysql 0.0.0.0:23306
mode tcp
balance roundrobin
option httpchk OPTIONS * HTTP/1.1\r\nHost:\ www
server db01 192.168.0.1:3306 weight 1 check port 6033 inter 1s rise 2 fall 2
server db02 192.168.0.2:3306 weight 1 check port 6033 inter 1s rise 2 fall 2
option tcpka
6. HAProxy启动脚本
# cat /etc/init.d/haproxy
#! /bin/sh
set -e
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/haproxy/sbin
PROGDIR=/usr/local/haproxy
PROGNAME=haproxy
DAEMON=$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
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