Mysql组复制-简单集群搭建

主机分配：

主机名	IP地址
MGR-node1	192.168.182.100
MOR-node2	192.168.182.101
MGR-node3	192.168.182.102

一 环境准备

编辑三台主机的hosts文件：重点：一定要注意设置好主机名以及hosts文件要不然mysql会找不到对应的机器

192.168.182.100 MGR-node1
192.168.182.101 MGR-node2
192.168.182.102 MGR-node3

系统版本查看

[[e-mail] ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)

为了方便实验，关闭所有节点的防火墙

[[e-mail] ~]# systemctl stop firewalld
[[e-mail] ~]# firewall-cmd --state
not running

[[e-mail] ~]# cat /etc/sysconfig/selinux |grep "SELINUX=disabled"
SELINUX=disabled
[[e-mail] ~]# setenforce 0           
setenforce: SELinux is disabled
[[e-mail] ~]# getenforce             
Disabled

二 在三个节点上安装Mysql5.7

下载mysql官方源

[[e-mail] ~]# yum localinstall https://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm

安装MySQL 5.7

[[e-mail] ~]# yum install -y mysql-community-server

启动MySQL服务器和MySQL的自动启动

[[e-mail] ~]# systemctl start mysqld.service
[[e-mail] ~]# systemctl enable mysqld.service

核对三台主机的mysql版本

[[e-mail] ~]# mysql -V
mysql  Ver 14.14 Distrib 5.7.31, for Linux (x86_64) using  EditLine wrapper

查看初始密码并登录

[[e-mail] ~]# cat /var/log/mysqld.log|grep 'A temporary password'
2020-07-18T06:54:38.562194Z 1 [Note] A temporary password is generated for [e-mail]: <Ezzv8w+pX7,

使用上面查看的密码<Ezzv8w+pX7, 登录mysql，并重置密码为123456

[[e-mail] ~]# mysql -p'<Ezzv8w+pX7,'

进入数据库设置简单密码策略

mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)

mysql> set global validate_password_length=1;
Query OK, 0 rows affected (0.00 sec)

mysql> set password=password("123456");
Query OK, 0 rows affected, 1 warning (0.00 sec)
    
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

三、MGR组复制环境部署 (多写模式)

这里有几个命令大家可能会用到，在部署环境命令错误时，需要初始化mysql。

# systemctl  stop  mysqld
# rm -rf /var/lib/mysql
# systemctl start mysqld

执行完，需要重新查看初始密码登入并修改密码

注意：3台节点的操作略有不同，不建议克隆操作

1) MGR-node1 配置

[[e-mail] ~]# cp /etc/my.cnf /etc/my.cnf.bak
[[e-mail] ~]# >/etc/my.cnf
[[e-mail] ~]# vim /etc/my.cnf

[mysqld]
datadir = /var/lib/mysql
socket = /var/lib/mysql/mysql.sock

symbolic-links = 0

log-error = /var/log/mysqld.log
pid-file = /var/run/mysqld/mysqld.pid

#GTID:
server_id = 1
gtid_mode = on
enforce_gtid_consistency = on

master_info_repository=TABLE
relay_log_info_repository=TABLE
binlog_checksum=NONE

#binlog
log_bin = mysql-bin
log-slave-updates = 1
binlog_format = row
sync-master-info = 1
sync_binlog = 1

#relay log
skip_slave_start = 1

transaction_write_set_extraction=XXHASH64
loose-group_replication_group_name="5db40c3c-180c-11e9-afbf-005056ac6820"
loose-group_replication_start_on_boot=off
loose-group_replication_local_address= "192.168.182.100:24901"
loose-group_replication_group_seeds= "192.168.182.100:24901,192.168.182.101:24901,192.168.182.102:24901"
loose-group_replication_bootstrap_group=off
loose-group_replication_single_primary_mode=off
loose-group_replication_enforce_update_everywhere_checks=on
loose-group_replication_ip_whitelist="192.168.182.0/24,127.0.0.1/8"

注意下图的几点：

修改完成后保存
重启mysql服务

[[e-mail] ~]# systemctl restart mysqld

登录mysql进行相关设置操作

[[e-mail] ~]# mysql -p123456

mysql> SET SQL_LOG_BIN=0; 
Query OK, 0 rows affected (0.00 sec)
 
mysql> GRANT REPLICATION SLAVE ON *.* TO [e-mail]'%' IDENTIFIED BY '[e-mail]';
Query OK, 0 rows affected, 1 warning (0.00 sec)
 
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.01 sec)
 
mysql> reset master;
Query OK, 0 rows affected (0.19 sec)
 
mysql> SET SQL_LOG_BIN=1;
Query OK, 0 rows affected (0.00 sec)
 
mysql> CHANGE MASTER TO MASTER_USER='rpl_slave', MASTER_PASSWORD='[e-mail]' FOR CHANNEL 'group_replication_recovery';
Query OK, 0 rows affected, 2 warnings (0.33 sec)
 
mysql> INSTALL PLUGIN group_replication SONAME 'group_replication.so';
Query OK, 0 rows affected (0.03 sec)

mysql> SHOW PLUGINS;
+----------------------------+----------+--------------------+----------------------+---------+
| Name                       | Status   | Type               | Library              | License |
+----------------------------+----------+--------------------+----------------------+---------+
...............
...............
| group_replication          | ACTIVE   | GROUP REPLICATION  | group_replication.so | GPL     |
+----------------------------+----------+--------------------+----------------------+---------+
46 rows in set (0.00 sec)
 
mysql> SET GLOBAL group_replication_bootstrap_group=ON;
Query OK, 0 rows affected (0.00 sec)
 
mysql> START GROUP_REPLICATION;
Query OK, 0 rows affected (2.34 sec)
 
mysql> SET GLOBAL group_replication_bootstrap_group=OFF;
Query OK, 0 rows affected (0.00 sec)
 
mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | 42ca8591-34bb-11e9-8296-005056ac6820 | MGR-node1   |        3306 | ONLINE       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
1 row in set (0.00 sec)

最后一栏保证是ONLINE 才是正常的！

创建一个测试库

mysql> CREATE DATABASE xingming CHARACTER SET utf8 COLLATE utf8_general_ci;     
Query OK, 1 row affected (0.03 sec)
  
mysql> use xingming;
Database changed
mysql> create table if not exists haha (id int(10) PRIMARY KEY AUTO_INCREMENT,name varchar(50) NOT NULL);
Query OK, 0 rows affected (0.24 sec)

mysql> insert into xingming.ziliao values(1,"maliu"),(2,"tangwu"),(3,"lisi"),(4,"zhangsan");
Query OK, 4 rows affected (0.01 sec)
Records: 4  Duplicates: 0  Warnings: 0


mysql> select * from xingming.ziliao;
+----+----------+
| id | name     |
+----+----------+
|  1 | maliu    |
|  2 | tangwu   |
|  3 | lisi     |
|  4 | zhangsan |
+----+----------+
4 rows in set (0.00 sec)

---

---

2) MGR-node2 配置

[[e-mail] ~]# cp /etc/my.cnf /etc/my.cnf.bak
[[e-mail] ~]# >/etc/my.cnf
[[e-mail] ~]# vim /etc/my.cnf

[mysqld]
datadir = /var/lib/mysql
socket = /var/lib/mysql/mysql.sock

symbolic-links = 0

log-error = /var/log/mysqld.log
pid-file = /var/run/mysqld/mysqld.pid

#GTID:
server_id = 2
gtid_mode = on
enforce_gtid_consistency = on

master_info_repository=TABLE
relay_log_info_repository=TABLE
binlog_checksum=NONE

#binlog
log_bin = mysql-bin
log-slave-updates = 1
binlog_format = row
sync-master-info = 1
sync_binlog = 1

#relay log
skip_slave_start = 1

transaction_write_set_extraction=XXHASH64
loose-group_replication_group_name="5db40c3c-180c-11e9-afbf-005056ac6820"
loose-group_replication_start_on_boot=off
loose-group_replication_local_address= "192.168.182.101:24901"
loose-group_replication_group_seeds= "192.168.182.100:24901,192.168.182.101:24901,192.168.182.102:24901"
loose-group_replication_bootstrap_group=off
loose-group_replication_single_primary_mode=off
loose-group_replication_enforce_update_everywhere_checks=on
loose-group_replication_ip_whitelist="192.168.182.0/24,127.0.0.1/8"

重启mysql服务

[[e-mail] ~]# systemctl restart mysqld

登录mysql进行相关设置操作

[[e-mail] ~]# mysql -p123456
.........
mysql> SET SQL_LOG_BIN=0;
Query OK, 0 rows affected (0.00 sec)
 
mysql> GRANT REPLICATION SLAVE ON *.* TO [e-mail]'%' IDENTIFIED BY '[e-mail]';
Query OK, 0 rows affected, 1 warning (0.00 sec)
 
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
 
mysql> reset master;
Query OK, 0 rows affected (0.17 sec)
 
mysql> SET SQL_LOG_BIN=1;
Query OK, 0 rows affected (0.00 sec)
 
mysql> CHANGE MASTER TO MASTER_USER='rpl_slave', MASTER_PASSWORD='[e-mail]' FOR CHANNEL 'group_replication_recovery';
Query OK, 0 rows affected, 2 warnings (0.21 sec)
 
mysql> INSTALL PLUGIN group_replication SONAME 'group_replication.so';
Query OK, 0 rows affected (0.20 sec)
 
mysql> SHOW PLUGINS;
+----------------------------+----------+--------------------+----------------------+---------+
| Name                       | Status   | Type               | Library              | License |
+----------------------------+----------+--------------------+----------------------+---------+
.............
.............
| group_replication          | ACTIVE   | GROUP REPLICATION  | group_replication.so | GPL     |
+----------------------------+----------+--------------------+----------------------+---------+
46 rows in set (0.00 sec)
 
mysql> START GROUP_REPLICATION;
Query OK, 0 rows affected (6.25 sec)

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | 8af18ff4-c8c3-11ea-bb9d-000c29e59105 | mgr-node1   |        3306 | ONLINE       |
| group_replication_applier | b9bfc6e9-c8c7-11ea-b043-000c29c3f2a0 | mgr-node2   |        3306 | ONLINE       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
2 rows in set (0.00 sec)

查看下，发现已经将MGR-node1节点添加的数据同步过来了

mysql> use xingming
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from ziliao;
+----+----------+
| id | name     |
+----+----------+
|  1 | maliu    |
|  2 | tangwu   |
|  3 | lisi     |
|  4 | zhangsan |
+----+----------+
4 rows in set (0.01 sec)

---

---

3) MGR-node3 配置

[[e-mail] ~]# cp /etc/my.cnf /etc/my.cnf.bak
[[e-mail] ~]# >/etc/my.cnf
[[e-mail] ~]# vim /etc/my.cnf

[mysqld]
datadir = /var/lib/mysql
socket = /var/lib/mysql/mysql.sock

symbolic-links = 0

log-error = /var/log/mysqld.log
pid-file = /var/run/mysqld/mysqld.pid

#GTID:
server_id = 3
gtid_mode = on
enforce_gtid_consistency = on

master_info_repository=TABLE
relay_log_info_repository=TABLE
binlog_checksum=NONE

#binlog
log_bin = mysql-bin
log-slave-updates = 1
binlog_format = row
sync-master-info = 1
sync_binlog = 1

#relay log
skip_slave_start = 1

transaction_write_set_extraction=XXHASH64
loose-group_replication_group_name="5db40c3c-180c-11e9-afbf-005056ac6820"
loose-group_replication_start_on_boot=off
loose-group_replication_local_address= "192.168.182.102:24901"
loose-group_replication_group_seeds= "192.168.182.100:24901,192.168.182.101:24901,192.168.182.102:24901"
loose-group_replication_bootstrap_group=off
loose-group_replication_single_primary_mode=off
loose-group_replication_enforce_update_everywhere_checks=on
loose-group_replication_ip_whitelist="192.168.182.0/24,127.0.0.1/8"

重启mysql服务

[[e-mail] ~]# systemctl restart mysqld

登录mysql进行相关设置操作

[[e-mail] ~]# mysql -p123456
..........
mysql> SET SQL_LOG_BIN=0;
Query OK, 0 rows affected (0.00 sec)
 
mysql> GRANT REPLICATION SLAVE ON *.* TO [e-mail]'%' IDENTIFIED BY '[e-mail]';
Query OK, 0 rows affected, 1 warning (0.00 sec)
 
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.01 sec)
 
mysql> reset master;
Query OK, 0 rows affected (0.10 sec)
 
mysql> SET SQL_LOG_BIN=1;
Query OK, 0 rows affected (0.00 sec)
 
mysql> CHANGE MASTER TO MASTER_USER='rpl_slave', MASTER_PASSWORD='[e-mail]' FOR CHANNEL 'group_replication_recovery';
Query OK, 0 rows affected, 2 warnings (0.27 sec)
 
mysql> INSTALL PLUGIN group_replication SONAME 'group_replication.so';
Query OK, 0 rows affected (0.04 sec)
 
mysql> SHOW PLUGINS;
+----------------------------+----------+--------------------+----------------------+---------+
| Name                       | Status   | Type               | Library              | License |
+----------------------------+----------+--------------------+----------------------+---------+
.............
| group_replication          | ACTIVE   | GROUP REPLICATION  | group_replication.so | GPL     |
+----------------------------+----------+--------------------+----------------------+---------+
46 rows in set (0.00 sec)
 
mysql> START GROUP_REPLICATION;
Query OK, 0 rows affected (4.54 sec)
 
mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | 8af18ff4-c8c3-11ea-bb9d-000c29e59105 | mgr-node1   |        3306 | ONLINE       |
| group_replication_applier | 8af6f48d-c8c3-11ea-8105-000c2908dcc4 | mgr-node3   |        3306 | ONLINE       |
| group_replication_applier | b9bfc6e9-c8c7-11ea-b043-000c29c3f2a0 | mgr-node2   |        3306 | ONLINE       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
3 rows in set (0.00 sec)

验证一下是否同步数据

mysql> use xingming
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from ziliao;
+----+----------+
| id | name     |
+----+----------+
|  1 | maliu    |
|  2 | tangwu   |
|  3 | lisi     |
|  4 | zhangsan |
+----+----------+
4 rows in set (0.00 sec)

只要组状态栏里都是online就说明是正常的
大功告成，可以测试一下是否一个节点写入，同时更新

node2节点操作

mysql> select * from ziliao;
+----+----------+
| id | name     |
+----+----------+
|  1 | maliu    |
|  2 | tangwu   |
|  3 | lisi     |
|  4 | zhangsan |
+----+----------+
4 rows in set (0.00 sec)

mysql> insert into xingming.ziliao values(11,"beijing"),(12,"shanghai"),(13,"anhui");
Query OK, 3 rows affected (0.01 sec)
Records: 3  Duplicates: 0  Warnings: 0

node1查看

mysql> select * from xingming.ziliao;
+----+----------+
| id | name     |
+----+----------+
|  1 | maliu    |
|  2 | tangwu   |
|  3 | lisi     |
|  4 | zhangsan |
| 11 | beijing  |
| 12 | shanghai |
| 13 | anhui    |
+----+----------+
7 rows in set (0.00 sec)

mysql> update xingming.ziliao set id=100 where name="anhui"; ##更新一个数据
Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

在node3上验证

mysql> select * from ziliao;
+-----+----------+
| id  | name     |
+-----+----------+
|   1 | maliu    |
|   2 | tangwu   |
|   3 | lisi     |
|   4 | zhangsan |
|  11 | beijing  |
|  12 | shanghai |
| 100 | anhui    |
+-----+----------+
7 rows in set (0.00 sec)

验证成功，说明mysql的gtid组复制多点写入搭建就成功了，
下面分享一些常见报错和解决方法

mysql> SELECT * FROM performance_schema.replication_group_members;
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | 8af18ff4-c8c3-11ea-bb9d-000c29e59105 | mgr-node1   |        3306 | ONLINE       |
| group_replication_applier | 8af6f48d-c8c3-11ea-8105-000c2908dcc4 | mgr-node3   |        3306 | ONLINE       |
| group_replication_applier | b9bfc6e9-c8c7-11ea-b043-000c29c3f2a0 | mgr-node2   |        3306 | RECOVERING   |
+---------------------------+--------------------------------------+-------------+-------------+--------------+

原因：如果my.cnf没问题的话，那就是hosts文件和主机名了。

当配置了错误的组信息，也无法插入数据时，
可以使用如下命令重新配置组信息

mysql> stop group_replication;  ##先停止组复制集群
mysql> reset master;            ##初始化master
mysql> start group_replication; ##开始组复制集群
mysql> SELECT * FROM performance_schema.replication_group_members; ##查看组复制状态

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