双主多从架构原理介绍
| IP | 端口 | 账号 | 密码 | 服务名 |
|---|---|---|---|---|
| 10.1.1.2 | 3306 | root/sync | abc123! | 数据库A |
| 10.1.1.3 | 3306 | root/sync | abc123! | 数据库B |
| 10.1.1.4 | 3306 | root/sync | abc123! | 数据库C |
1.两台mysql都可读写，互为主备，默认只使用一台（masterA）负责数据的写入，另一台（masterB）备用；
2.masterA是masterB的主库，masterB又是masterA的主库，它们互为主从；
3.两台主库之间做高可用,可以采用MyCAT中间件暴露一个统一的服务给client,同时当2主任意一台宕机时，还能提供服务。宕掉的机器重启恢复之后，数据可以同步得到；
4.所有提供服务的从服务器与masterB进行主从同步（双主多从）;
#创建目录 mkdir -p /home/docker-compose/mysql cd /home/docker-compose/mysql/ && mkdir data conf vi docker-compose.yml
version: '3.1'
services:mysql:restart: alwaysimage: mysql:5.7container_name: mysqlports:- 3306:3306environment:TZ: Asia/ShanghaiMYSQL_ROOT_PASSWORD: abc123! ##密码command:--character-set-server=utf8mb4--collation-server=utf8mb4_general_ci--explicit_defaults_for_timestamp=true--lower_case_table_names=1--max_allowed_packet=128M--sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO"volumes:- ./data:/var/lib/mysql- ./conf:/etc/mysql/mysql.conf.d进入目录
cd /home/docker-compose/mysql/conf编写MySQL配置文件
vi mysqld.cnf主节点1配置
[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
default-time-zone='+8:00'
symbolic-links=0
server-id = 40
log-bin = mysql-bin
enforce_gtid_consistency = ON
gtid_mode = ON
auto_increment_increment=1
auto_increment_offset=1
log-slave-updates
sync_binlog=1
max_connections=1000
innodb_file_per_table=1
innodb_file_format=Barracuda
innodb_page_size=32K
innodb_log_file_size=148M主节点2配置
[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
default-time-zone='+8:00'
symbolic-links=0
server-id = 66
log-bin = mysql-bin
enforce_gtid_consistency = ON
gtid_mode = ON
auto_increment_increment=2
auto_increment_offset=2
log-slave-updates
sync_binlog=1
max_connections=1000
innodb_file_per_table=1
innodb_file_format=Barracuda
innodb_page_size=32K
innodb_log_file_size=148启动mysql
docker-compose up -d
docker-compose down //直接删除容器
docker-compose stop //不删除容器
docker-compose start //直接启动进入容器：
docker exec -it mysql /bin/bash
mysql -uroot -pabc123!设置2个主节点的主从关系
查看10.1.1.2的日志信息:
File: mysql-bin.000005
Position: 1495
mysql> show master status G;
*************************** 1. row ***************************File: mysql-bin.000005Position: 1495Binlog_Do_DB: Binlog_Ignore_DB:
Executed_Gtid_Set: c83eb7e9-2556-11eb-b4ad-0242ac120002:20-21,
d52d0074-2556-11eb-93b5-0242ac120002:1-20
1 row in set (0.00 sec)ERROR:
No query specifiedmysql> 查看10.1.1.3的日志信息:
File: mysql-bin.000004
Position: 1796
mysql> show master status G;
*************************** 1. row ***************************File: mysql-bin.000004Position: 1796Binlog_Do_DB: Binlog_Ignore_DB:
Executed_Gtid_Set: c83eb7e9-2556-11eb-b4ad-0242ac120002:1-21,
d52d0074-2556-11eb-93b5-0242ac120002:20
1 row in set (0.00 sec)ERROR:
No query specifiedmysql> 在两个节点执行
create user 'sync'@'%' identified by 'password';
grant replication slave on *.* to sync;##Mysql复制错误error_code: 1045 Access denied for usergrant replication slave on *.* to 'sync'@'%' identified by 'password';flush privileges; //刷新MySQL的系统权限相关表，否则会无法用账号链接修改master_host与master_log_file与master_log_pos三个值
#节点设置 需要同步的节点（主库节点）
#在10.1.1.2设置
FLUSH TABLES WITH READ LOCK;
change master to master_host='10.1.1.3',master_port=3306,master_user='sync',master_password='password',master_log_file='mysql-bin.000004',master_log_pos=1796;
UNLOCK TABLES;#在10.1.1.3设置
FLUSH TABLES WITH READ LOCK;
change master to master_host='10.1.1.2',master_port=3306,master_user='sync',master_password='password',master_log_file='mysql-bin.000005',master_log_pos=1495;
UNLOCK TABLES;开启主从复制 :
start slave;检查
mysql> show slave status G;
*************************** 1. row ***************************Slave_IO_State: Waiting for master to send eventMaster_Host: 10.1.1.3Master_User: syncMaster_Port: 3306Connect_Retry: 60Master_Log_File: mysql-bin.000004Read_Master_Log_Pos: 1796Relay_Log_File: a389ed970e74-relay-bin.000005Relay_Log_Pos: 822Relay_Master_Log_File: mysql-bin.000004Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: 以下三项为正常
Slave_IO_State: Waiting for master to send event
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
未完待续
