MySQL5.7+keepalived+LVS从库负载均衡搭建

数据库架构：一主三从

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;