配置mysql-cluster群集高可用(三)

之前已经配置好了mysql-cluster群集，由于日常sql节点通常都大于1台，这意味着应用程序一部分要使用sql1节点，一部分使用sql2节点，当然，所有的应用程序只需要一个节点，但这样不在群集节点间做分流负载，也就不必做群集了，另外，如果一个群集节点down机了，随之而来的程序也down掉，该如何解决，因此我用keepalived来实现对sql节点的高可用，问题又来了，这里的keepalived存在单机故障，所以准备2台互备，我们用lvs来实现负载均衡，这样其中一个节点或者keepalived坏掉，应用程序将仍然可以工作，因为负载均衡器将请求转到了工作正常的另外一个节点，我们需要一个虚拟IP地址:192.168.18.100。它会安排给这个MySQL群集的负载均衡,以便于应用程序通过统一单独的IP地址来访问群集。 

回想一下之前的部署ip结构:

 

192.168.18.10：MGM/SQL1

192.168.18.11：NDBD1/lvs+keepalived

192.168.18.12：NDBD2/lvs+keepalived

192.168.18.9  :   SQL2

VIP：192.168.18.100

 

1.在11/12这2台设备上安装lvs+keepalived

[root@localhost  home]yum -y install ipvsadm

[root@localhost  home]tar -zxf keepalived-1.2.7.tar.gz

[root@localhost  home]cd keepalived-1.2.7

[root@localhost keepalived-1.2.7]#  ./configure --prefix=/usr/local/keepalived/

[root@localhost keepalived-1.2.7]#make && make install

[root@localhost keepalived-1.2.7]#vi /usr/local/keepalived/keepalived.conf

 

! Configuration File for keepalived

 

global_defs {

 router_id LVS_DEVEL

}

 

vrrp_instance VI_1 {

 state MASTER       ＃备机上改为BACKUP

 interface eth1

 virtual_router_id 51

 priority 100

 advert_int 3

 authentication {

 auth_type PASS

 auth_pass 1111

 }

 virtual_ipaddress {

 192.168.18.100

 }

}

 

virtual_server 192.168.18.100 3306 {

 delay_loop 6

 lb_algo rr

 lb_kind DR

 persistence_timeout 60

 protocol TCP

 

real_server 192.168.18.9 3306 {

 weight 1

 TCP_CHECK {

 connect_timeout 3

 nb_get_retry 3

 delay_before_retry 3

 connect_port 3306

 }

}

real_server 192.168.18.10 3306 {

 weight 1

 TCP_CHECK{

 connect_timeout 3

 nb_get_retry 3

 delay_before_retry 3

 connect_port 3306

 }

}

}

 

启动keepalived：

[root@localhost  home]/usr/local/keepalived/sbin/keepalived -D -f /usr/local/keepalived/keepalived.conf

 

2.在2台sql节点行编辑如下脚本

[root@localhost  home]vi re.sh

 

#!/bin/sh

VIP=192.168.18.100

/etc/rc.d/init.d/functions

case "$1" in

start)

echo "Start LVS of RealServer"

/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up

route add -host $VIP dev lo:0

echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce

;;

stop)

/sbin/ifconfig lo:0 down

echo "Stop LVS of RealServer"

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce

;;

*)

echo "Usage:$0{start|stop}"

exit 1

esac

 

[root@localhost  home] chmod +x re.sh

[root@localhost  home]./re.sh start

 好了，现在可以直接利用vip，192.168.18.100来连接了