1.準備機器，需要至少準備2臺機器
3.配置mysql雙機master-master實現，不再贅述，參見另一篇mysql mmm的博文
2.安裝lvs和keepalived和配置keepalived,參見http://www.keepalived.org/sery-lvs-cluster.pdf，注意lvs的最新版本是1.26,對應的是linux2.6.28以上內核版本，版本需要一致，
否則編譯不通過，查看內核版本命令： uname -r
3. 操作說明：
1). keepalived啓動後會自動綁定虛ip到物理網卡上，比如eth0。如果主機不同時是mysql主機不需要realserver腳本。
2). mysql主機，即不需要keepalived服務的主機，只需要安裝lvs模塊，並且需要配置realserver腳本，並且需要啓動此腳本。
realserver裏配置的虛ip月keepalived裏配置的虛ip保持一致，虛ip一定要被綁定到lo上。這是由lvs/dr模式的處理方式決定的。（使用VS/DR方法：調度器和服務
器組都必須在物理上有一個網卡通過不分斷的局域網相連，如通過交換機或者高速的HUB相連。VIP地址爲調度器和服務器組共享，調度器配置的VIP地址是
對外可見的，用於接收虛擬服務的請求報文；所有的服務器把VIP地址配置在各自的Non-ARP網絡設備上，它對外面是不可見的，只是用於處理目標地址爲
VIP的網絡請求。在VS/DR中，調度器根據各個服務器的負載情況，動態地選擇一臺服務器，不修改也不封裝IP報文，而是將數據幀的MAC地址改爲選出
服務器的MAC地址，再將修改後的數據幀在與服務器組的局域網上發送。因爲數據幀的MAC地址是選出的服務器，所以服務器肯定可以收到這個數據幀，從中可
以獲得該IP報文。當服務器發現報文的目標地址VIP是在本地的網絡設備上，服務器處理這個報文，然後根據路由表將響應報文直接返回給客戶。
）
3).keepalived需要安裝1.2.1版本，否則sorry server的切換會有問題
4).自動切換原理是：keepalived realserver列表只配置一臺mysql主機，sorry server配置另一臺主機，這樣在realserver正常情況下，sorry server不會被切換，
只充當備機，只有realserver出故障時才切換到sorry server，keepalived的sorry server天生具有這個特性。
5). iptables防火牆配置，keepalived的master與backup之間需要保證心跳，這樣才能保證其相互切換，如果iptables不進行特殊配置，則不會正常切換。配置如下：
-I INPUT -i eth0 -d 224.0.0.0/8 -j ACCEPT
-A INPUT -p 112 -i eth0 -j ACCEPT
-A OUTPUT -p 112 -o eth0 -j ACCEPT
4. 具體操作：
1) keepalived master主機和mysql master主機：10.3.1.24
keepalived backup主機: 10.3.1.18
mysql slave 主機：10.3.1.23
虛ip：10.3.1.56
2) keepalived master(10.3.1.24)配置：
global_defs {
lvs_id LVS_HA_MASTER
}
vrrp_sync_group DBGROUP {
group {
VI_MYSQL
}
}
vrrp_instance VI_MYSQL {
state MASTER
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 59
priority 200
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.3.1.56
}
}
virtual_server 10.3.1.56 3306 {
delay_loop 3
lb_algo wlc
lb_kind DR
# persistence_timeout 20
protocol TCP
sorry_server 10.3.1.23 3306
real_server 127.0.0.1 3306 {
weight 100
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
3) mysql master realserver(10.3.1.24)腳本：
#!/bin/bash
#desciription : start realserver
MYSQLHA=10.3.1.56
/etc/rc.d/init.d/functions
case "$1" in
start)
echo " start LVS of REALServer"
/sbin/ifconfig lo:0 $MYSQLHA broadcast $MYSQLHA netmask 255.255.255.255 up
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 "close LVS Directorserver"
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
4) keepalived backup（10.3.1.18）配置：
global_defs {
lvs_id LVS_HA_BACKUP #注意這兒與master不同
}
vrrp_sync_group DBGROUP {
group {
VI_MYSQL
}
}
vrrp_instance VI_MYSQL {
state BACKUP #注意這兒，與master不同
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 59
priority 100 #注意這兒，與master不同
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.3.1.56
}
}
virtual_server 10.3.1.56 3306 {
delay_loop 3
lb_algo wlc
lb_kind DR
# persistence_timeout 20
protocol TCP
sorry_server 10.3.1.23 3306
real_server 10.3.1.24 3306 {
weight 100
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
5) mysql slave realserver(10.3.1.23)腳本：
#!/bin/bash
#desciription : start realserver
MYSQLHA=10.3.1.56
/etc/rc.d/init.d/functions
case "$1" in
start)
echo " start LVS of REALServer"
/sbin/ifconfig lo:0 $MYSQLHA broadcast $MYSQLHA netmask 255.255.255.255 up
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 "close LVS Directorserver"
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
6). 防火牆配置：
vi /etc/sysconfig/iptables
add:
-I INPUT -i eth0 -d 224.0.0.0/8 -j ACCEPT
-A INPUT -p 112 -i eth0 -j ACCEPT
-A OUTPUT -p 112 -o eth0 -j ACCEPT
保存後重啓：service iptables restart
7).啓動
keepalive master: service keepalived start
mysql master: /usr/local/bin/realserver start
調用ip add 命令會看到:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet 10.3.1.56/32 brd 10.3.1.56 scope global lo:0
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether f4:ce:46:b4:35:40 brd ff:ff:ff:ff:ff:ff
inet 10.3.1.24/8 brd 10.255.255.255 scope global eth0
inet 10.3.1.56/32 scope global eth0
inet6 fe80::f6ce:46ff:feb4:3540/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether f4:ce:46:b4:35:44 brd ff:ff:ff:ff:ff:ff
4: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
keepalived backup啓動： service keepalived start
調用ip add 命令會看到:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether f4:ce:46:89:63:98 brd ff:ff:ff:ff:ff:ff
inet 10.3.1.18/8 brd 10.255.255.255 scope global eth0
inet6 fe80::f6ce:46ff:fe89:6398/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether f4:ce:46:89:63:9c brd ff:ff:ff:ff:ff:ff
4: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
注意不會綁定任何ip
msyql slave: /usr/local/bin/realserver start
調用ip add 命令會看到:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet 10.3.1.56/32 brd 10.3.1.56 scope global lo:0
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether f4:ce:46:b4:31:58 brd ff:ff:ff:ff:ff:ff
inet 10.3.1.23/8 brd 10.255.255.255 scope global eth0
inet6 fe80::f6ce:46ff:feb4:3158/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether f4:ce:46:b4:31:5c brd ff:ff:ff:ff:ff:ff
4: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
使用keepalive+lvs實現mysql master-master自動故障轉移
發表評論
所有評論
還沒有人評論，想成為第一個評論的人麼? 請在上方評論欄輸入並且點擊發布.
相關文章