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 --force
rpm -ivh mysql-cluster-community-libs-8.0.34-1.el7.x86_64.rpm --nodeps --force
rpm -ivh mysql-cluster-community-client-8.0.34-1.el7.x86_64.rpm --nodeps --force
rpm -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 = OFF
loose-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 = OFF
loose-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 = OFF
loose-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)