MGR_ mysqlsh_ Keepalive high availability architecture deployment document

1. Architecture node description

MGR Single master mode 192.168.17.135（ Lord ） 192.168.17.136（ from ）, 192.168.17.137（ from ）
Mysql router（ Lord ） 192.168.17.136:6446 Is a read-write node
Mysql router（ Lord ） 192.168.17.136:6447 Is a read-only node
Mysql router ( To prepare ) 192.168.17.137:6446 Is a read-write node
Mysql router ( To prepare ) 192.168.17.137:6447 Is a read-only node
Keepalive 192.168.17.150:6446 Read / write nodes connected for applications
Keepalive 192.168.17.150:6447 Read only nodes connected for applications

2. install mgr5.7

https://www.modb.pro/db/105831

3.Mysql-shell

Upload mysql-shell 8.0, And run mysql-shell, perform cluster = dba.createCluster(“myCluster”)
establish , perform cluster.status() View the cluster status

When looking at the current cluster status , You can see mgrdb1:3306 Is a read-write node

4.mysql-router

192.168.17.136 Dominant mysql-router, use bootstrap Parameters automatically build configuration files and startup scripts

Modify or add parameters , modify mysqlrouter.conf file

start-up mysql-router
[[email protected] myrouter]# ./start.sh
[[email protected] myrouter]# PID 99090 written to ‘/tmp/myrouter/mysqlrouter.pid’

5. Deploy standby mysql-router

scp Master mysql-router Profile to 192.168.17.137
[[email protected] ~]# scp -r [email protected]:/root/mysql_router .
[email protected]’s password:
mysqlrouter.1 100% 42KB 16.3MB/s 00:00
…

6.keepalive

install keepalive(136 and 137 All need to be installed )
[[email protected] myrouter]# yum install -y keepalived
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile

• base: mirrors.aliyun.com
  …
  Dependency Updated:
  ipset.x86_64 0:7.1-1.el7 ipset-libs.x86_64 0:7.1-1.el7

Complete!

6.1 modify keepalive Configuration parameters

[[email protected] keepalived]# cat keepalived.conf
global_defs {
router_id Myrouter-HA
}

vrrp_script check_run {
script “/etc/keepalived/Myrouter_check.sh”
interval 30
}

vrrp_sync_group VG1 {
group {
VI_1
}
}

vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass 1234
}
track_script {
check_run
}

virtual_ipaddress {    192.168.17.150}

}

[[email protected] keepalived]# cat Myrouter_check.sh
#!/bin/bash

#1 . Check myrouter Whether the process is abnormal
myrouter_cnt=netstat -tlnp|grep 6446 |grep mysqlrouter|wc -l
if [ $myrouter_cnt -lt 1 ]
then
systemctl stop keepalived
/sbin/arping -I ens33 -c 5 -s 192.168.17.150 192.168.17.2 &>/dev/null
exit 0
fi

6.2 start-up keepalive

systemctl start keepalived.service

7. Verification test

7.1 verification down A node , Fail over

 The current master node is mgrdb1

adopt vip Connect , View the current connection node

Turn off the master node mgrdb1
kill -9 pidof mysqld

mgr It will automatically reselect the master . The Lord became mgrdb2

adopt vip Connect , View the current connection node

Nodes are automatically transferred to mgrdb2, Indicates that the failover was successful .

7.2 verification mysqlroter Fail over

VIP Host computer mgrdb2 On .

simulation mysqlrouter down machine

Check the standby VIP, Standby machine VIP Started successfully

 see VIP Connect , Successful connection , And connected to the read-write node mgrdb2