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;

网站栏目：MySQL5.7+keepalived+LVS从库负载均衡搭建
本文来源：http://csdahua.cn/article/jdiehs.html