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