mysql 8.0 高可用_MySQL8.0 MIC高可用集群搭建

mysql8.0带来的新特性，结合MySQLshell，不须要第三方中间件，自动构建高可用集群。python

mysql8.0做为一款新产品，其内置的mysq-innodb-cluster(MIC)高可用集群的技术确实惊艳，结合MySQLshell可以实施集群的快速部署，MySQL-route可以实现灾备快速切换，内置读写分离技术，负载均衡技术。结合但实际效果如何，还需验证。mysql

一，集群部署linux

1.1 安装环境；sql

操做系统：Linux，版本：CentOS-7-x86shell

介质准备：无数据库

环境清理bootstrap

释放yum进程session

[root@bug ~]# ps -ef|grep yum

root22481 1694 5 17:23 ? 00:00:03 /usr/bin/python /usr/share/PackageKit/helpers/yum/yumBackend.py get-updates none

root22591 22507 1 17:24 pts/0 00:00:00 grep --color=auto yum

[root@bug~]# kill -9 22481

查看是否有多余系统，有则卸载app

[root@bug ~]# rpm -qa|grep mairadb

[root@bug ~]# rpm -qa|grep mysql

关闭防火墙负载均衡

[root@bug ~]# systemctl status firewalld.service

● firewalld.service - firewalld - dynamic firewall daemon

Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)

Active: inactive (dead)

关闭selinux，重启系统后生效

[root@bug selinux]# vi /etc/selinux/config

SELINUX=disabled

[root@bug selinux]# reboot

1.2 安装MySQL8.0

[root@bug ~]# yum install -y wget https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm

[root@bug ~]# yum list|grep mysql

[root@bug ~]# yum install -y mysql-community-client.x86_64 mysql-router.x86_64 mysql-shell.x86_64

采用YUM源安装方式，总下载量约400M，

1.3自动集群部署

部署节点1

[root@bug ~]# mysqlsh

MySQL JS > dba.deploySandboxInstance(3310);

A new MySQL sandbox instance will be created on this host in

/root/mysql-sandboxes/3310

Warning: Sandbox instances are only suitable for deploying and

running on your local machine for testing purposes and are not

accessible from external networks.

Please enter a MySQL root password for the new instance:******

Deploying new MySQL instance...

Instance localhost:3310 successfully deployed and started.

Use shell.connect('root@localhost:3310'); to connect to the instance.

第一个节点部署完毕，端口设置为3310，登录帐号为root@localhost，密码******

使用本地认证的方式， 登录数据库实例，进行验证。

[root@bug ~]# mysql -uroot -porange -S /root/mysql-sandboxes/3310/sandboxdata/mysqld.sock

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with ; or \g.

一样的方法，部署节点2，节点3。

MySQL JS > dba.deploySandboxInstance(3320);

MySQL JS >dba.deploySandboxInstance(3330);

1.4建立集群

此实验采用简单的建立本地集群。

MySQL JS > \connect root@localhost:3310

Creating a session to 'root@localhost:3310'

*****************************************************

MySQL localhost:3310 ssl JS > var cluster=dba.createCluster('test')

A new InnoDB cluster will be created on instance 'root@localhost:3310'.

*********************************************************

Cluster successfully created. Use Cluster.addInstance() to add MySQL instances.

At least 3 instances are needed for the cluster to be able to withstand up to

one server failure.

集群系统已经建立成功，最后一行：At least 3 instances are needed for the cluster to be able to withstand up to one server failure.提示须要至少三个实例，才能保证灾备，因此接下来，将节点2，3添加进集群。

MySQL localhost:3310 ssl JS > cluster.addInstance( 'root@localhost:3320')

The instance 'root@localhost:3320' was successfully added to the cluster.

MySQL localhost:3310 ssl JS > cluster.addInstance( 'root@localhost:3330')

The instance 'root@localhost:3330' was successfully added to the cluster.

查看集群状态

MySQL localhost:3310 ssl JS > dba.getCluster().status()

{

"clusterName": "test",

"defaultReplicaSet": {

"name": "default",

"primary": "localhost:3310",

"ssl": "REQUIRED",

"status": "OK",

"statusText": "Cluster is ONLINE and can tolerate up to ONE failure.",

"topology": {

"localhost:3310": {

"address": "localhost:3310",

"mode": "R/W",

"readReplicas": {},

"role": "HA",

"status": "ONLINE"

},

"localhost:3320": {

"address": "localhost:3320",

"mode": "R/O",

"readReplicas": {},

"role": "HA",

"status": "ONLINE"

},

"localhost:3330": {

"address": "localhost:3330",

"mode": "R/O",

"readReplicas": {},

"role": "HA",

"status": "ONLINE"

}

}

},

"groupInformationSourceMember": "mysql://root@localhost:3310"

}

一个简单的包含三个节点的集群已经建立完成。能够完成数据同步，读写分离等功能，好比此刻3310端口的状态是"R/W"，同时read与write，3320与3330的状态是"R/O"，只读模式。

1.5配置中间件

此时的集群的高可用性还不完整，须要MySQL-router来完成集群与外部的对接，实现自动切换，故障转移等功能。

MySQL-router的做用相似keepalived 类的中间件。当主机发生故障后，自动将应用切换到其余实例。

[root@bug ~]# mysqlrouter --bootstrap root@localhost:3310 --user=mysqlrouter

Please enter MySQL password for root: *****

Bootstrapping system MySQL Router instance...

Checking for old Router accounts

Creating account mysql_router2_j05xzi45m81x@'%'

MySQL Router has now been configured for the InnoDB cluster 'test'.

The following connection information can be used to connect to the cluster.

Classic MySQL protocol connections to cluster 'test':

- Read/Write Connections: localhost:6446

- Read/Only Connections: localhost:6447

X protocol connections to cluster 'test':

- Read/Write Connections: localhost:64460

- Read/Only Connections: localhost:64470

Existing configurations backed up to '/etc/mysqlrouter/mysqlrouter.conf.bak'

[root@bug ~]# mysqlrouter&

[1] 25602

[root@bug ~]# ps -ef|grep router

mysqlro+ 25602 22507 8 19:35 pts/0 00:00:01 mysqlrouter

root 25619 22507 0 19:36 pts/0 00:00:00 grep --color=auto router

验证MySQL-router安装效果

在MySQL-router默认配置下，

主机端口：6446

从库端口：6447

[root@bug ~]# mysql -uroot -h 127.0.0.1 -P 6446 -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

********************************************************8

mysql>

证实MySQL-router配置完成可用。

1.6验证集群效果

1,经过router同时登录三个节点，查看端口号。

2,在节点1构造数据，在节点2，3差看状态，验证数据同步性。

3,节点1(主机)离线，查看集群状态与节点2，节点3状态，验证灾备能力。