Xtradb+Haproxy高可用数据库集群（二）haproxy负载均衡篇

vzdsa

Xtradb集群部署完成后，3台机器都能同时读写，此时需要在前端搭建haproxy来进行负载均衡。
官网haproxy配置参考地址：

https://www.percona.com/doc/perc ... s/virt_sandbox.html

Haproxy服务器配置
拿一台机器用作haproxy，此处是192.168.6.219。
安装haproxy

yum install haproxy -y

配置文件：

[iyunv@yang-219 ~]# cat /etc/haproxy/haproxy.cfg

global

log 127.0.0.1 local0

log 127.0.0.1 local1 notice

maxconn 4096

chroot /usr/share/haproxy

user haproxy

group haproxy

daemon

defaults

log global

mode http

option tcplog

option dontlognull

retries 3

option redispatch

maxconn 2000

contimeout 5000

clitimeout 50000

srvtimeout 50000

frontend pxc-front

bind *:3307

mode tcp

default_backend pxc-back

frontend stats-front

bind *:8080

mode http

default_backend stats-back

frontend pxc-onenode-front

bind *:3308

mode tcp

default_backend pxc-onenode-back

backend pxc-back

mode tcp

balance leastconn

option httpchk

server c1 192.168.70.71:3306 check port 9200 inter 12000 rise 3fall 3

server c2 192.168.70.72:3306 check port 9200 inter 12000 rise 3fall 3

server c3 192.168.70.73:3306 check port 9200 inter 12000 rise 3fall 3

backend stats-back

mode http

balance roundrobin

stats uri /haproxy/stats

stats auth pxcstats:secret

backend pxc-onenode-back

mode tcp

balance leastconn

option httpchk

server c1 192.168.70.71:3306 check port 9200 inter 12000 rise 3fall 3

server c2 192.168.70.72:3306 check port 9200 inter 12000 rise 3fall 3

server c3 192.168.70.73:3306 check port 9200 inter 12000 rise 3fall 3

启动haproxy

/etc/init.d/haproxy start

web访问

上面配置的8080端口及/haproxy/stats
访问url：192.168.6.219:8080/haproxy/stats  
用户名密码是上面配置的pxcstats:secret


xtradb服务器上xinetd配置在所有xtradb服务器上，都要配置xinetd打开9200端口来进行监控。

yum instal  xinetd

配置mysqlchk监控

[iyunv@percona2 mysql]# cat /etc/xinetd.d/mysqlchk

# default: on

# description: mysqlchk

service mysqlchk

{

# this is a config for xinetd, place it in /etc/xinetd.d/

        disable = no

        flags           = REUSE

        socket_type     = stream

        type            = UNLISTED

        port            = 9200

        wait            = no

        user            = nobody

        server          = /usr/bin/clustercheck

       log_on_failure  += USERID

        only_from       = 0.0.0.0/0

        #

        # Passingarguments to clustercheck

        # <user><pass> <available_when_donor=0|1> <log_file><available_when_readonly=0|1> <defaults_extra_file>"

        # Recommended:server_args   = user pass 1/var/log/log-file 0 /etc/my.cnf.local"

        # Compatibility:server_args = user pass 1 /var/log/log-file 1 /etc/my.cnf.local"

        # 55-to-56upgrade: server_args = user pass 1 /var/log/log-file 0 /etc/my.cnf.extra"

        #

        # recommended toput the IPs that need

        # to connectexclusively (security purposes)

        per_source      = UNLIMITED

}

默认安装xtradb server后会安装此配置.

重启xinetd服务

/etc/init.d/xinetd restart

haproxy每一段时间检测xtradb服务器上的9200端口，当clustercheck命令执行的结果不是200时，haproxy的检测将会把该机器从负载均衡中摘除，从而达到自动failover的效果。