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数据库架构：一主三从
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master：192.168.8.57
slave1：192.168.8.58
slave2：192.168.8.59
slave3：192.168.8.61
manager：192.168.8.60
工具包：
mha4MySQL-manager-0.58.tar.gz
mha4mysql-node-0.58.tar.gz
keepalived-1.4.5.tar.gz
此项目数据库架构中，master和slave1利用MHA和keepalived实现故障自动切换，slave2和slave3利用 keepalived和LVS实现负载均衡，本文着重讲解负载均衡的搭建过程。
一、安装ipvsadm
在slave2和slave3安装
mount /dev/cdrom /media yum install -y ipvsadm
二、安装keepalived
tar zxvf keepalived-1.4.5.tar.gz cd keepalived-1.4.5 ./configure --prefix=/usr/local/keepalived/ make && make install
设置开机自动启动
systemctl enable keepalived
三、更改keepalived日志位置
keepalived日志默认位置为/var/log/messages
把日志单独存放
修改 vi /usr/local/keepalived/etc/sysconfig/keepalived
把 KEEPALIVED_OPTIONS="-D" 修改为：KEEPALIVED_OPTIONS="-D -d -S 0"
vi /usr/local/keepalived/etc/sysconfig/keepalived # Options for keepalived. See `keepalived --help' output and keepalived(8) and # keepalived.conf(5) man pages for a list of all options. Here are the most # common ones : # # --vrrp -P Only run with VRRP subsystem. # --check -C Only run with Health-checker subsystem. # --dont-release-vrrp -V Dont remove VRRP VIPs & VROUTEs on daemon stop. # --dont-release-ipvs -I Dont remove IPVS topology on daemon stop. # --dump-conf -d Dump the configuration data. # --log-detail -D Detailed log messages. # --log-facility -S 0-7 Set local syslog facility (default=LOG_DAEMON) # KEEPALIVED_OPTIONS="-D -d -S 0"
重启服务
systemctl restart rsyslog
四、修改keepalived配置文件
192.168.8.59
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id 859
notification_email {
zdd5503@163.com
}
notification_email_from zdd5503@163.com
smtp_server stmp.163.com
smtp_connect_timeout 30
}
vrrp_instance v_mysql_slave_wgpt1 {
state MASTER
interface enp0s3
virtual_router_id 98
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass steven
}
virtual_ipaddress {
192.168.8.98/24
}
}
virtual_server 192.168.8.98 3306 {
delay_loop 2
lb_algo rr
lb_kind DR
persistence_timeout 0
protocol TCP
real_server 192.168.8.59 3306 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
real_server 192.168.8.61 3306 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
192.168.8.61
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id 861
notification_email {
zdd5503@163.com
}
notification_email_from zdd5503@163.com
smtp_server stmp.163.com
smtp_connect_timeout 30
}
vrrp_instance v_mysql_slave_wgpt1 {
state BACKUP
interface enp0s3
virtual_router_id 98
priority 80
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass steven
}
virtual_ipaddress {
192.168.8.98/24
}
}
virtual_server 192.168.8.98 3306 {
delay_loop 2
lb_algo rr
lb_kind DR
persistence_timeout 0
protocol TCP
real_server 192.168.8.59 3306 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
real_server 192.168.8.61 3306 {
weight 1
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
systemctl daemon-reload
systemctl start keepalived
systemctl enable keepalived
ps -ef |grep keepalived
ip a
五、lo:0绑定VIP地址、抑制ARP广播
192.168.8.59
vi /etc/rc.d/init.d/lvsmysql.sh
#!/bin/bash
#
. /etc/rc.d/init.d/functions
VIP1=$1
case "$2" in
start)
echo " Start LVS of MySQL Slave REALServer"
/sbin/ifconfig lo:0 $VIP1 broadcast $VIP1 netmask 255.255.255.255 up
/sbin/route add -host $VIP1 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
;;
stop)
/sbin/ifconfig lo:0 down
/sbin/route del $VIP1 >/dev/null 2>&1
echo "Stoped LVS of MySQL Slave Directorserver"
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
status)
isLoOn=`/sbin/ifconfig lo:0 | grep "$VIP"`
isRoOn=`/bin/netstat -rn | grep "$VIP"`
if [ "$isLoON" == "" -a "$isRoOn" == "" ]; then
echo "LVS-DR real server has run yet."
else
echo "LVS-DR real server is running."
fi
exit 3
;;
*)
echo "Usage: $0 {start|stop|status}"
exit 1
esac
exit 0
192.168.8.61
vi /etc/rc.d/init.d/lvsmysql.sh
#!/bin/bash
#
. /etc/rc.d/init.d/functions
VIP1=$1
case "$2" in
start)
echo " Start LVS of MySQL Slave REALServer"
/sbin/ifconfig lo:0 $VIP1 broadcast $VIP1 netmask 255.255.255.255 up
/sbin/route add -host $VIP1 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
;;
stop)
/sbin/ifconfig lo:0 down
/sbin/route del $VIP1 >/dev/null 2>&1
echo "Stoped LVS of MySQL Slave Directorserver"
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
status)
isLoOn=`/sbin/ifconfig lo:0 | grep "$VIP"`
isRoOn=`/bin/netstat -rn | grep "$VIP"`
if [ "$isLoON" == "" -a "$isRoOn" == "" ]; then
echo "LVS-DR real server has run yet."
else
echo "LVS-DR real server is running."
fi
exit 3
;;
*)
echo "Usage: $0 {start|stop|status}"
exit 1
esac
exit 0
六、测试负载均衡
/etc/rc.d/init.d/lvsmysql.sh 192.168.8.59 start
/etc/rc.d/init.d/lvsmysql.sh 192.168.8.59 stop
/etc/rc.d/init.d/lvsmysql.sh 192.168.8.61 start
/etc/rc.d/init.d/lvsmysql.sh 192.168.8.61 stop
echo "/etc/rc.d/init.d/lvsmysql.sh 192.168.1.65 start" >>
/etc/rc.d/rc.local
echo "ipvsadm --set 15 5 15" >> /etc/rc.d/rc.local
ifconfig
ipvsadm -L
mysql -uroot -pmysql -h292.168.8.59 -e "select @@hostname;"
mysql -uroot -pmysql -h292.168.8.61 -e "select @@hostname;