LVS+Keepalived+MysqlCluster搭建高可用的Mysql系統(實測可行)

環境

• CentOS7.0
  -mysql-cluster-gpl-7.1.9a-linux-i686-glibc23.tar.gz
• keepalived-1.4.2.tar.gz

方案

安裝MysqlCluster

在此不再贅述，安裝詳情見我的上一篇文章MysqlCluster安裝實測可行

安裝keepalived

安裝必要的外掛(官網上要求的和一些必備的)

 - yum install curl gcc openssl-devel libnl3-devel net-snmp-devel
 - yum install -y libnfnetlink-devel（解決錯誤:configure: error: libnfnetlink headers missing）
 - yum install kernel-devel ipvsadm -y

安裝

• 上傳檔案到/etc/local/,解壓
• tar -zxvf keepalived-1.4.2.tar.gz
• cd keepalived-1.4.2
• ./configure –prefix=/usr/local/keepalived(prefix：指定安裝目錄）
• make
• make install
  -完成以上步驟 ，安裝就完成了，目錄結構如下：
  

配置MASTER和BACKUP

• 在 /etc/keepalived建立keepalived.conf，檔案內容如下：

global_defs {
    router_id LVS_DEVEL
}
vrrp_instance VI_MYSQL_1 {
        state MASTER //(備機：BACKUP)
        interface ens33
        virtual_router_id 55
        priority 150 //(備機:100）
        advert_int 5
        authentication {
                auth_type PASS
                auth_pass 010203
        }
        virtual_ipaddress {
                192.168.1.200
        }
}
virtual_server 192.168.1.200 3306 {
        delay_loop 6
        lb_algo rr
        lb_kind DR
        persistence_timeout 6
        protocol TCP

        real_server 192.168.1.2 3306 {
                weight 1
                TCP_CHECK {
                        connect_timeout 3
                        nb_get_retry 3
                        delay_before_retry 3
                        connect_port 3306
                }
        }
        real_server 192.168.1.3 3306 {
                weight 1
                TCP_CHECK {
                        connect_timeout 3
                        nb_get_retry 3
                        delay_before_retry 3
                        connect_port 3306
                }
        }
        real_server 192.168.1.4 3306 {
                weight 1
                TCP_CHECK {
                        connect_timeout 3
                        nb_get_retry 3
                        delay_before_retry 3
                        connect_port 3306
                }
        }CKUP
}

• 備機使用scp命令從主機拷貝

/etc/keepalived/keepalived.conf 192.168.1.14:/etc/keepalived/`

• 移動啟動相關的檔案

cp  /usr/local/keepalived-1.4.2/keepalived/etc/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

配置LVS節點

（這一步至關重要，不然VIP無法跟LVS節點建立連線，keealived執行正常，但是client就是連不上VIP）

• vi /etc/rc.d/init.d/realserver.sh 檔案內容如下：
  SNS_VIP=192.168.1.200設定VIP，如果你的VIP不是該ip，請修改

#!/bin/bash
# description: Config realserver lo and apply noarp
SNS_VIP=192.168.1.200

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

case "$1" in
start)
       ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
       /sbin/route add -host $SNS_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
       sysctl -p >/dev/null 2>&1
       echo "RealServer Start OK"

       ;;
stop)
       ifconfig lo:0 down
       route del $SNS_VIP >/dev/null 2>&1
       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 "RealServer Stoped"
       ;;
*)
       echo "Usage: $0 {start|stop}"
       exit 1
esac

exit 0

• 賦予該執行許可權

1.chmod +x /etc/rc.d/init.d/functions
2.chmod +x /etc/rc.d/init.d/realserver.sh

• 啟動

/etc/rc.d/init.d/realserver.sh start 

• ifconfig檢視新增的虛擬ip
  

啟動keepalived

• 啟動項在 cd /etc/init.d
• ./keealived start
• 檢視日誌檔案
  tail -f /var/log/message
  

• ipvsadm
  

• 連線VIP
  

• ipvsadm -lc
  

測試

• 當主機掛了，備機就會變成主機提供服務
• 當主機恢復後，備機將從主機回到備機狀態
• keepalived主機會監聽LVS節點，當有SQL(LVS)掛點或上線，主機會第一時間與其建立聯絡或者斷開連線

總結

配置LVS節點至關重要，務必配置。

LVS+keepalived+MysqlCluster實現了mysql的高可用性，高擴充套件。單MysqlCluster是無法完成這個任務的，keepalived實現了負載均衡，從而將高可用體現了出來。