HAProxy+keepalived+MySQL实现MHA中slave集群的负载均衡的高可用
Ip地址划分:
240 mysql_b2
242 mysql_b1
247 haproxy1
249 haproxy2
243 VIP
248 client
1、安装HAProxy
yum install gcc -y
make TARGET=linux26 PREFIX=/usr/local/haproxy
make install PREFIX=/usr/local/haproxy
cp /usr/src/haproxy/haproxy-1.5.3/examples/haproxy.cfg /usr/local/haproxy/
cp /usr/src/haproxy/haproxy-1.5.3/examples/haproxy.init /etc/init.d/haproxy
chmod 755 /etc/init.d/haproxy
ln -s /usr/local/haproxy/sbin/* /usr/sbin/
mkdir /etc/haproxy
mkdir /usr/share/haproxy
ln -s /usr/local/haproxy/haproxy.cfg /etc/haproxy/
cd ..
1.2 设置配置文件
1.2.1 拷贝配置文件
[root@HAProxy_247 haproxy]# cp haproxy.cfg /usr/local/haproxy/
cp: overwrite `/usr/local/haproxy/haproxy.cfg'? y
1.2.2 编辑配置文件
[root@HAProxy_247 haproxy]# vim /usr/local/haproxy/haproxy.cfg
注意修改RS的IP:
1.3 启动HAProxy服务
[root@HAProxy_247 haproxy]# service haproxy start
1.4 访问HAProxy的网页
http://localhost:8899/admin-status
用户名密码查看配置文件设置
1.5 客户端测试
2、安装配置keepalived
2.1 修改yum仓库
[aa]
baseurl=file:///mnt/LoadBalancer
gpgcheck=0
ebabled=1
2.2 安装keepalived
yum install keepalived -y
2.3 修改247上配置文件(覆盖原配置文件即可)
注:keepalived工作机制--同一组(virtual_router_id)的keepalived互相检测存活,优先级高的作用时,优先级低的沉睡。当优先级高的宕掉时,优先级低的顶替其工作。
vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived vrrp_script chk_haproxy { script "/etc/keepalived/chk.sh" interval 2 } vrrp_instance VI_1 { state BACKUP nopreempt interface eth0 virtual_router_id 51 #定义分组ID,同一组ID相同 priority 100 #优先级 advert_int 1 authentication { auth_type PASS auth_pass abcd } virtual_ipaddress { 192.168.18.243 #VIP } track_script { chk_haproxy } notify_backup "/etc/init.d/haproxy restart" //切换主/备/出错时执行的脚本 notify_fault "/etc/init.d/haproxy stop" }
2.4 修改249上的主配置文件
! Configuration File for keepalived vrrp_script chk_haproxy { script "/etc/keepalived/chk.sh" interval 2 } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 99 advert_int 1 authentication { auth_type PASS auth_pass abcd } virtual_ipaddress { 192.168.18.243 } track_script { chk_haproxy } notify_backup "/etc/init.d/haproxy restart" notify_fault "/etc/init.d/haproxy stop" }
2.5 编写脚本,并放到指定位置
vim /etc/keepalived/chk.sh
#!/bin/bash if [ $(ps -C haproxy --no-header | wc -l) -eq 0 ]; then #判断haproxy是否存活,如果宕了,停止keepalived服务 /etc/init.d/keepalived stop fi
chmod +x chk.sh
2.6 开启keepalived并验证
service keepalived restart
在247上关闭HAProxy后:
2.7 客户端测试
MHA中failover后,进入HAProxy配置文件中将new_master从HAProxy分发列表中剔除
来源:https://www.cnblogs.com/dannylinux/p/8038331.html