mysql8.0.3集群搭建

下载mysql安装包：

https://dev.mysql.com/downloads/mysql/5.7.html#downloads

准备环境

1、准备三台服务器并设置hosts

192.168.236.143 mysql1
192.168.236.144 mysql2
192.168.236.145 mysql3

2、设置免密登陆

#生成秘钥
ssh-keygen -t rsa
#一直按Enter即可
#将秘钥分别拷贝到另外两个机器
ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.236.144
ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.236.145
#测试
ssh 192.168.236.143

3、关闭防火墙

#关闭防火墙
systemctl stop firewalld
#禁用防火墙
systemctl disable firewalld

4、关闭selinux

vi /etc/selinux/config
#设置
SELINUX=disabled

重启服务器

安装mysql

#解压
[root@mysql1 data]# tar -xvf mysql-cluster-community-8.0.34-1.el7.x86_64.rpm-bundle.tar 
mysql-cluster-community-client-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-client-plugins-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-common-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-data-node-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-debuginfo-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-devel-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-embedded-compat-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-icu-data-files-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-java-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-libs-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-libs-compat-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-management-server-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-ndbclient-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-ndbclient-devel-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-nodejs-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-server-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-server-debug-8.0.34-1.el7.x86_64.rpm
mysql-cluster-community-test-8.0.34-1.el7.x86_64.rpm

1、依次安装

 rpm -ivh mysql-cluster-community-common-8.0.34-1.el7.x86_64.rpm --nodeps --forcerpm -ivh mysql-cluster-community-libs-8.0.34-1.el7.x86_64.rpm --nodeps --forcerpm -ivh mysql-cluster-community-client-8.0.34-1.el7.x86_64.rpm --nodeps --forcerpm -ivh mysql-cluster-community-server-8.0.34-1.el7.x86_64.rpm --nodeps --force

2、配置mysql

#初始化mysql
mysqld --initialize
#给mysql分组中的mysql用户赋权限
chown mysql:mysql /var/lib/mysql -R
#启动mysql服务器
systemctl start mysqld.service
#设置开机启动mysql
systemctl enable mysqld

3、查看mysql初始化的密码

[root@mysql1 data]# cat /var/log/mysqld.log | grep password
2023-08-09T05:11:28.204159Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: )c=&)ea<<3,O

密码即是最后面的)c=&)ea<<3,O
4、修改数据库密码

#进入mysql
mysql -u root -p
#然后输入密码，即可进入mysql
#修改密码
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '1234';
#退出mysql
exit;
#创建账号名和密码
create user 'admin'@'%' identified with mysql_native_password by 'admin';
#授权远程链接
grant all privileges on *.* to 'admin'@'%' with grant option;
#刷新权限
flush privileges;

5、mysql服务命令

#查看mysql版本
mysql -V
#启动mysql服务
systemctl start mysqld.service
#停止mysql服务
systemctl stop mysqld.service
#重启mysql服务
systemctl restart mysqld.service
#查看mysql服务当前状态
systemctl status mysqld.service
#设置mysql服务开机自启动
systemctl enable mysqld.service
#停止mysql服务开机自启动
systemctl disable mysqld.service

安装mysql shell

下载：https://downloads.mysql.com/archives/shell/

#安装
rpm -ivh mysql-shell-8.0.33-1.el7.x86_64.rpm

集群配置

1、修改配置文件

vi /etc/my.cnf
#mysql1配置文件增加
server-id=1
gtid_mode=on
enforce_gtid_consistency=on
binlog_checksum=none
transaction_write_set_extraction = XXHASH64
loose-group_replication_recovery_use_ssl= ON
loose-group_replication_group_name = '5dbabbe6-8050-49a0-9131-1de449167446'
loose-group_replication_start_on_boot = OFFloose-group_replication_local_address = 'mysql1:24901'
loose-group_replication_group_seeds = 'mysql1:24901,mysql2:24902,mysql3:24903'
loose-group_replication_bootstrap_group = OFF#mysql2配置文件增加
server-id=2
gtid_mode=on
enforce_gtid_consistency=on
binlog_checksum=none
transaction_write_set_extraction = XXHASH64
loose-group_replication_recovery_use_ssl= ON
loose-group_replication_group_name = '5dbabbe6-8050-49a0-9131-1de449167446'
loose-group_replication_start_on_boot = OFFloose-group_replication_local_address = 'mysql2:24901'
loose-group_replication_group_seeds = 'mysql1:24901,mysql2:24902,mysql3:24903'
loose-group_replication_bootstrap_group = OFF#mysql3配置文件增加
server-id=3
gtid_mode=on
enforce_gtid_consistency=on
binlog_checksum=none
transaction_write_set_extraction = XXHASH64
loose-group_replication_recovery_use_ssl= ON
loose-group_replication_group_name = '5dbabbe6-8050-49a0-9131-1de449167446'
loose-group_replication_start_on_boot = OFFloose-group_replication_local_address = 'mysql3:24901'
loose-group_replication_group_seeds = 'mysql1:24901,mysql2:24902,mysql3:24903'
loose-group_replication_bootstrap_group = OFF

2、启动mysql并使用shell连接

#启动mysql
systemctl start mysqld.service
#在每个服务器上都是用shell连接mysql
mysqlsh admin@localhost:3306
#每个服务器都执行
dba.configureInstance();
dba.checkInstanceConfiguration("admin@localhost:3306");

3、进入mysql安装组复制插件

mysql> INSTALL PLUGIN group_replication SONAME 'group_replication.so';

4、进入mysql shell创建集群(注意只在其中一台服务器上执行即可)

 MySQL  localhost:3306 ssl  JS > var cluster = dba.createCluster('myCluster');

5、添加节点

 MySQL  localhost:3306 ssl  JS > cluster.addInstance('admin@mysql1:3306');#创建节点即添加，可以不执行MySQL  localhost:3306 ssl  JS > cluster.addInstance('admin@mysql2:3306');MySQL  localhost:3306 ssl  JS > cluster.addInstance('admin@mysql3:3306');

6、查看当前节点状态

 MySQL  localhost:3306 ssl  JS > cluster.status()
{"clusterName": "myCluster", "defaultReplicaSet": {"name": "default", "primary": "mysql1:3306", "ssl": "REQUIRED", "status": "OK", "statusText": "Cluster is ONLINE and can tolerate up to ONE failure.", "topology": {"mysql1:3306": {"address": "mysql1:3306", "memberRole": "PRIMARY", "mode": "R/W", "readReplicas": {}, "replicationLag": "applier_queue_applied", "role": "HA", "status": "ONLINE", "version": "8.0.34"}, "mysql2:3306": {"address": "mysql2:3306", "memberRole": "SECONDARY", "mode": "R/O", "readReplicas": {}, "replicationLag": "applier_queue_applied", "role": "HA", "status": "ONLINE", "version": "8.0.34"}, "mysql3:3306": {"address": "mysql3:3306", "memberRole": "SECONDARY", "mode": "R/O", "readReplicas": {}, "replicationLag": "applier_queue_applied", "role": "HA", "status": "ONLINE", "version": "8.0.34"}}, "topologyMode": "Single-Primary"}, "groupInformationSourceMember": "mysql1:3306"
}

7、查看节点信息，任意节点即可

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 2ef5a678-3673-11ee-b7fb-000c29d4f7b1 | mysql2      |        3306 | ONLINE       | SECONDARY   | 8.0.34         | MySQL                      |
| group_replication_applier | 2efc06f0-3673-11ee-8284-000c29b47d6f | mysql1      |        3306 | ONLINE       | PRIMARY     | 8.0.34         | MySQL                      |
| group_replication_applier | 2f144a98-3673-11ee-b663-000c2973412e | mysql3      |        3306 | ONLINE       | SECONDARY   | 8.0.34         | MySQL                      |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
3 rows in set (0.00 sec)

安装mysql router

下载地址：https://downloads.mysql.com/archives/router/

# 安装
rpm -ivh mysql-router-community-8.0.33-1.el7.x86_64.rpm 
#查看mysqlrouter版本
mysqlrouter --version

配置router

vim /etc/mysqlrouter/mysqlrouter.conf
#增加如下配置
[routing:secondary]
bind_address = 0.0.0.0
bind_port = 7001
destinations = mysql1:3306,mysql2:3306,mysql3:3306
routing_strategy = round-robin[routing:primary]
bind_address = 0.0.0.0
bind_port = 7002
destinations = mysql1:3306,mysql2:3306,mysql3:3306
routing_strategy = first-available

启动mysql router

mysqlrouter -c /etc/mysqlrouter/mysqlrouter.conf &

测试连接情况

#连接mysql
mysql -h 192.168.236.145 -P 7001 -uadmin -padmin
mysql -h 192.168.236.145 -P 7002 -uadmin -padmin
#执行命令获取Mysql中配置的server_id，每次执行返回的server_id不一样，因为使用轮询策略
mysql -h192.168.236.145 -uadmin -padmin -e "select @@server_id" -P 7001
#执行命令获取Mysql中配置的server_id，每次执行返回的server_id都一样
mysql -h192.168.236.145 -uadmin -padmin -e "select @@server_id" -P 7002

查看监听状态

[root@mysql3 data]# netstat -tnlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name           
tcp6       0      0 ::1:7001                :::*                    LISTEN      13179/mysqlrouter   
tcp6       0      0 ::1:7002                :::*                    LISTEN      13179/mysqlrouter   

测试

使用工具连接测试，关掉其中一台数据库仍然可以连接
通过mysql命令查询，primary已经切换了

mysql> select * from performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE | MEMBER_ROLE | MEMBER_VERSION | MEMBER_COMMUNICATION_STACK |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
| group_replication_applier | 2ef5a678-3673-11ee-b7fb-000c29d4f7b1 | mysql2      |        3306 | ONLINE       | PRIMARY     | 8.0.34         | MySQL                      |
| group_replication_applier | 2efc06f0-3673-11ee-8284-000c29b47d6f | mysql1      |        3306 | ONLINE       | SECONDARY   | 8.0.34         | MySQL                      |
| group_replication_applier | 2f144a98-3673-11ee-b663-000c2973412e | mysql3      |        3306 | ONLINE       | SECONDARY   | 8.0.34         | MySQL                      |
+---------------------------+--------------------------------------+-------------+-------------+--------------+-------------+----------------+----------------------------+
3 rows in set (0.05 sec)