mysql之 mysql 5.6不停机双主一从搭建（活跃双主一从基于日志点复制）

环境说明：
版本 version 5.6.25-log
主1库ip: 10.219.24.25
主2库ip: 10.219.24.22
从1库ip：10.219.24.26
os 版本： centos 6.7
已安装热备软件：xtrabackup
防火墙已关

补充：
主从复制原理： http://blog.csdn.net/zhang123456456/article/details/72972701
mysql 5.6安装 ：http://blog.csdn.net/zhang123456456/article/details/53608554
xtrabackup 安装： http://blog.csdn.net/zhang123456456/article/details/72836184

整个流程：先搭建一主一从，然后反向搭建双活，最后搭建一主一从

1、 主库参数调整
-- 停止主库mysql
[root@mysql02 ~]# service mysql stop
[root@mysql02 ~]# netstat -nltp|grep mysql|grep 3606
-- 主库创建relay log目录
[root@mysql02 full]# mkdir -p /data/mysql/relaylog/
[root@mysql02 full]# chown -R mysql:mysql /data/mysql/relaylog
-- 调整 my.cnf 参数
[root@mysql02 ~]# cat /etc/my.cnf
[root@mysql02 full]# cat /etc/my.cnf
[client]
password = oracle
port = 3306
socket = /data/mysql/mysql.sock
[mysqld]
server-id=25
port = 3306
socket = /data/mysql/mysql.sock
character_set_server = utf8
character_set_client = utf8
collation-server=utf8_general_ci
lower_case_table_names = 1
max_connections = 1000
datadir = /data/mysql
log_bin = /data/mysql/binarylog/binlog
log_bin_index = /data/mysql/binarylog/binlog
log_slave_updates = 1
relay-log = /data/mysql/relaylog/relay
relay-log-index = /data/mysql/relaylog/relay
relay_log_purge = on
binlog_format = mixed
innodb_data_file_path = ibdata1:12M:autoextend
auto_increment_increment = 10
auto_increment_offset = 1
[mysql]
default-character-set = utf8

说明：
a、主库必须配置的参数
server-id （主从的server-id必须不同）、log_bin、binlog_format、relay-log、relay-log-index、relay_log_purge、relay_log_purge
auto-increment-offset、auto-increment-increment

b、log-slave-updates 意思是，中继日志执行之后，这些变化是否需要计入自己的binarylog。 当你的B服务器需要作为另外一个服务器的主服务器的时候需要打开。 就是双主互相备份，或者多主循环备份。 我们这里需要， 所以打开。

c、auto-increment-offset、auto-increment-increment 两个参数用于在 双主（多主循环）互相备份。 因为每台数据库服务器都可能在同一个表中插入数据，如果表有一个自动增长的主键，那么就会在多服务器上出现主键冲突。 解决这个问题的办法就是让每个数据库的自增主键不连续。 上图说是， 我假设需要将来可能需要10台服务器做备份， 所以auto-increment-increment 设为10. 而 auto-increment-offset=1 表示这台服务器的序号。 从1开始， 不超过auto-increment-increment。这样做之后， 我在这台服务器上插入的第一个id就是 1， 第二行的id就是 11了， 而不是2.（同理，在第二台服务器上插入的第一个id就是2， 第二行就是12， 这个后面再介绍） 这样就不会出现主键冲突了。 后面我们会演示这个id的效果。

-- 启动主库
[root@mysql02 ~]# mysqld_safe --defaults-file=/etc/my.cnf &
2、 从库参数调整
-- 停止从库mysql
[root@mysql01 ~]# service mysql stop
[root@mysql01 ~]# netstat -nltp|grep mysql|grep 3606
-- 调整 my.cnf 参数
[root@mysql01 ~]# cat /etc/my.cnf
[client]
password = oracle
port = 3306
socket = /data/mysql/mysql.sock
[mysqld]
server-id=22
port = 3306
socket = /data/mysql/mysql.sock
character_set_server = utf8
character_set_client = utf8
collation-server=utf8_general_ci
lower_case_table_names = 1
max_connections = 1000
datadir = /data/mysql
log_bin = /data/mysql/binarylog/binlog
log_bin_index = /data/mysql/binarylog/binlog
log_slave_updates = 1
relay-log = /data/mysql/relaylog/relay
relay-log-index = /data/mysql/relaylog/relay
relay_log_purge = on
auto_increment_increment = 10
auto_increment_offset = 2
[mysql]
default-character-set = utf8

说明：从库必须配置的参数
server-id、log_bin、relay-log、relay_log_purge、auto-increment-offset、auto-increment-increment、relay_log_purge

3、 主库备份
-- 主库备份目录
[root@mysql02 full]# pwd
/xtrabackup/full
-- 主库 innobackupex 备份
[root@mysql02 ~]# innobackupex --user=root --password=oracle --port=3606 /xtrabackup/full/
170610 17:50:23 Backup created in directory '/xtrabackup/full/2017-06-10_17-50-19/'
MySQL binlog position: filename 'binlog.000010', position '120'
....
170610 17:50:23 completed OK!
-- 查看备份 binlog编号 与 截止 position
[root@mysql02 2017-06-10_17-50-19]# cat xtrabackup_binlog_info
binlog.000010 120

4、 从库创建与主库相同的备份目录
[root@mysql01 ~]# mkdir -p /xtrabackup/full
[root@mysql01 ~]# chown -R mysql:mysql /xtrabackup/full/

5、 主库将备份 scp 到从库
[root@mysql02 full]# pwd
/xtrabackup/full
[root@mysql02 full]# scp -r 2017-06-10_17-50-19 10.219.24.22:/xtrabackup/full
6、 从库查看scp过来的备份
[root@mysql01 ~]# cd /xtrabackup/full/2017-06-10_17-50-19/
[root@mysql01 2017-06-10_17-50-19]# ll
total 12320
-rw-r-----. 1 root root 419 Jun 10 18:01 backup-my.cnf
-rw-r-----. 1 root root 12582912 Jun 10 18:01 ibdata1
drwxr-x---. 2 root root 4096 Jun 10 18:01 mysql
drwxr-x---. 2 root root 4096 Jun 10 18:01 performance_schema
drwxr-x---. 2 root root 4096 Jun 10 18:01 test
-rw-r-----. 1 root root 18 Jun 10 18:01 xtrabackup_binlog_info
-rw-r-----. 1 root root 113 Jun 10 18:01 xtrabackup_checkpoints
-rw-r-----. 1 root root 482 Jun 10 18:01 xtrabackup_info
-rw-r-----. 1 root root 2560 Jun 10 18:01 xtrabackup_logfile

7、 主库创建同步用户
mysql> GRANT replication slave ON *.* TO 'slave25'@'%' IDENTIFIED BY 'oracle';
Query OK, 0 rows affected (0.05 sec)

8、 从库恢复主库数据
-- 从库将原有datadir文件夹重命名到新位置，并创建原文件夹
[root@mysql01 ~]# mv /data/mysql /data/mysqlbak
[root@mysql01 ~]# mkdir -p /data/mysql
-- innobackupex apply-log
[root@mysql01 ~]# innobackupex --apply-log --user=oracle \
--password=oracle --port=3606 /xtrabackup/full/2017-06-10_17-50-19/
-- innobackupex copy 恢复的文件到原来的数据位置
[root@mysql01 mysql]# innobackupex --defaults-file=/etc/my.cnf --user=root \
--copy-back /xtrabackup/full/2017-06-10_17-50-19/

170610 18:25:11 completed OK!
-- 创建binlog目录与 relaylog 目录并赋权
[root@mysql01 ~]# mkdir -p /data/mysql/binarylog
[root@mysql01 ~]# mkdir -p /data/mysql/relaylog/
[root@mysql01 mysql]# chown -R mysql:mysql /data/mysql

9、 从库配置与检测
-- 从库启动
[root@mysql01 mysql]# mysqld_safe --defaults-file=/etc/my.cnf &
-- 从库指定与主库同步的基本信息
mysql>
change master to
master_host='10.219.24.25',
master_port=3306,
master_user='slave25',
master_password='oracle',
master_log_file='binlog.000010',
master_log_pos=120;
Query OK, 0 rows affected, 2 warnings (0.04 sec)

参数解释：
MASTER_HOST : 设置要连接的主服务器的ip地址
MASTER_USER : 设置要连接的主服务器的用户名
MASTER_PASSWORD : 设置要连接的主服务器的密码
MASTER_LOG_FILE : 设置要连接的主服务器的bin日志的日志名称
MASTER_LOG_POS : 设置要连接的主服务器的bin日志的记录位置

-- 启动slave 状态(开始监听msater的变化)
mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)
-- 查看slave的状态.
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.219.24.25
Master_User: slave25
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: binlog.000017
Read_Master_Log_Pos: 217
Relay_Log_File: relay.000002
Relay_Log_Pos: 377
Relay_Master_Log_File: binlog.000017
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 217
Relay_Log_Space: 540
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 25
Master_UUID: 29d68531-4cf9-11e7-8e1f-000c297c4100
Master_Info_File: /data/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: 29d68531-4cf9-11e7-8e1f-000c297c4100:1-4
Auto_Position: 0
1 row in set (0.00 sec)

ERROR:
No query specified

10、 主从同步检查
-- 主库
mysql> create database repl;
Query OK, 1 row affected (0.00 sec)
mysql> use repl
Database changed
mysql> create table repl (id int);
Query OK, 0 rows affected (0.02 sec)
mysql> insert into repl values(1);
Query OK, 1 row affected (0.00 sec)

-- 从库
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| binarylog |
| mysql |
| performance_schema |
| relaylog |
| repl |
| test |
+--------------------+
7 rows in set (0.00 sec)
mysql> use repl
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 repl;
+------+
| id |
+------+
| 1 |
+------+
1 row in set (0.00 sec) >一主一从同步成功！

##################################################
#至此A到B的复制已经配置完成，下面配置从B到A的复制。#
##################################################

声明> 下面操作中 新主库即为原从库（10.219.24.22） 新从库为原主库（10.219.24.25）

11、 新主库创建同步用户
mysql> GRANT replication slave ON *.* TO 'slave22'@'%' IDENTIFIED BY 'oracle';
Query OK, 0 rows affected (0.00 sec)

12、 新主库查看 binlog 文件号与 position 点
mysql> show master status;
+---------------+----------+--------------+------------------+------------------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+------------------------------------------+
| binlog.000010 | 120 | | | 29d68531-4cf9-11e7-8e1f-000c297c4100:1-4 |
+---------------+----------+--------------+------------------+------------------------------------------+
1 row in set (0.00 sec)

13、 新从库指定与主库同步的基本信息
mysql>
change master to
master_host='10.219.24.22',
master_port=3306,
master_user='slave22',
master_password='oracle',
master_log_file='binlog.000010',
master_log_pos=120;
Query OK, 0 rows affected, 2 warnings (0.04 sec)

14、新从库打开 slave 复制功能
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
15、 新从库检测同步复制状态
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.219.24.22
Master_User: slave22
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: binlog.000010
Read_Master_Log_Pos: 120
Relay_Log_File: relay.000002
Relay_Log_Pos: 280
Relay_Master_Log_File: binlog.000010
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 120
Relay_Log_Space: 443
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 22
Master_UUID: 70023652-4dc7-11e7-9360-000c2944297a
Master_Info_File: /data/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: 29d68531-4cf9-11e7-8e1f-000c297c4100:1-4
Auto_Position: 0
1 row in set (0.00 sec)

ERROR:
No query specified

-- 新从库测试数据同步状态
mysql> create database mm_repl;
Query OK, 1 row affected (0.00 sec)
mysql> use mm_repl;
Database changed
mysql> create table mm_repl(id int auto_increment,name varchar(10), primary key(id));
Query OK, 0 rows affected (0.01 sec)
mysql> insert into mm_repl(name) values("andy"),("taoYe");
Query OK, 1 row affected (0.00 sec)
mysql> select * from mm_repl;
+----+-------+
| id | name |
+----+-------+
| 1 | andy |
| 11 | taoYe |
+----+-------+
2 rows in set (0.00 sec)
-- 新主库测试数据同步状态
mysql> select * from mm_repl;
+----+-------+
| id | name |
+----+-------+
| 1 | andy |
| 11 | taoYe |
+----+-------+
2 rows in set (0.00 sec)
mysql> insert into mm_repl(name) values("andy"),("taoYe");
Query OK, 2 rows affected (0.00 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from mm_repl;
+----+-------+
| id | name |
+----+-------+
| 1 | andy |
| 11 | taoYe |
| 12 | andy |
| 22 | taoYe |
+----+-------+
4 rows in set (0.00 sec)
-- 新从库检查同步复制
mysql> select * from mm_repl;
+----+-------+
| id | name |
+----+-------+
| 1 | andy |
| 11 | taoYe |
| 12 | andy |
| 22 | taoYe |
+----+-------+
4 rows in set (0.00 sec) >主主同步测试成功

##################################################
#至此双主复制已经配置完成，下面配置主A到从C的复制。#
##################################################

主1从1搭建：

1、 停止从库mysql
[root@mysql01 ~]# service mysql stop
[root@mysql01 ~]# netstat -nltp|grep mysql|grep 3606

2、 从库参数调整
-- 调整 my.cnf 参数
[root@mysql01 ~]# cat /etc/my.cnf
[root@mysql03 mysql]# cat /etc/my.cnf
[client]
password = oracle
port = 3306
socket = /data/mysql/mysql.sock
[mysqld]
server-id=26
port = 3306
socket = /data/mysql/mysql.sock
character_set_server = utf8
character_set_client = utf8
collation-server=utf8_general_ci
lower_case_table_names = 1
max_connections = 1000
datadir = /data/mysql
log_bin = /data/mysql/binarylog/binlog
log_bin_index = /data/mysql/binarylog/binlog
relay-log = /data/mysql/relaylog/relay
relay-log-index = /data/mysql/relaylog/relay
relay_log_purge = on
read-only = 1
[mysql]
default-character-set = utf8
说明：从库必须配置的参数
server-id、log_bin、relay-log、read-only

3、 主库备份
-- 主库备份目录
[root@mysql02 full]# pwd
/xtrabackup/full
-- 主库 innobackupex 备份
[root@mysql02 ~]# innobackupex --user=root --password=oracle --port=3606 /xtrabackup/full/
170611 23:55:25 Backup created in directory '/xtrabackup/full/2017-06-11_23-55-20/'
MySQL binlog position: filename 'binlog.000017', position '980'
....
170611 23:55:25 completed OK!
-- 查看备份 binlog编号 与 截止 position
[root@mysql02 2017-06-11_23-55-20]# cat xtrabackup_binlog_info
binlog.000017 980

4、 从库创建与主库相同的备份目录
[root@mysql01 ~]# mkdir -p /xtrabackup/full
[root@mysql01 ~]# chown -R mysql:mysql /xtrabackup/full/

5、 主库将备份 scp 到从库
[root@mysql02 full]# pwd
/xtrabackup/full
[root@mysql02 full]# scp -r 2017-06-11_23-55-20 10.219.24.26:/xtrabackup/full
6、 从库查看scp过来的备份
[root@mysql03 ~]# cd /xtrabackup/full/2017-06-11_23-55-20/
[root@mysql03 2017-06-11_23-55-20]# ll
total 12328
-rw-r-----. 1 root root 419 Jun 11 23:57 backup-my.cnf
-rw-r-----. 1 root root 12582912 Jun 11 23:57 ibdata1
drwxr-x---. 2 root root 4096 Jun 11 23:57 mm_repl
drwxr-x---. 2 root root 4096 Jun 11 23:57 mysql
drwxr-x---. 2 root root 4096 Jun 11 23:57 performance_schema
drwxr-x---. 2 root root 4096 Jun 11 23:57 repl
drwxr-x---. 2 root root 4096 Jun 11 23:57 test
-rw-r-----. 1 root root 18 Jun 11 23:57 xtrabackup_binlog_info
-rw-r-----. 1 root root 113 Jun 11 23:57 xtrabackup_checkpoints
-rw-r-----. 1 root root 482 Jun 11 23:57 xtrabackup_info
-rw-r-----. 1 root root 2560 Jun 11 23:57 xtrabackup_logfile

7、 主库创建同步用户
mysql> GRANT replication slave ON *.* TO 'slave26'@'%' IDENTIFIED BY 'oracle';
Query OK, 0 rows affected (0.05 sec)

8、 从库恢复主库数据
-- 从库将原有datadir文件夹重命名到新位置，并创建原文件夹
[root@mysql01 ~]# mv /data/mysql /data/mysqlbak
[root@mysql01 ~]# mkdir -p /data/mysql
-- innobackupex apply-log
[root@mysql01 ~]# innobackupex --defaults-file=/etc/my.cnf --apply-log --user=oracle \
--password=oracle --port=3606 /xtrabackup/full/2017-06-11_23-55-20/
-- innobackupex copy 恢复的文件到原来的数据位置
[root@mysql01 mysql]# innobackupex --defaults-file=/etc/my.cnf --user=root \
--copy-back /xtrabackup/full/2017-06-11_23-55-20/
170610 18:25:11 completed OK!
-- 创建binlog目录与 relaylog 目录并赋权
[root@mysql01 ~]# mkdir -p /data/mysql/binarylog
[root@mysql01 ~]# mkdir -p /data/mysql/relaylog/
[root@mysql01 mysql]# chown -R mysql:mysql /data/mysql

9、 从库配置与检测
-- 从库启动
[root@mysql01 mysql]# mysqld_safe --defaults-file=/etc/my.cnf &
-- 从库指定与主库同步的基本信息
mysql>
change master to
master_host='10.219.24.25',
master_port=3306,
master_user='slave26',
master_password='oracle',
master_log_file='binlog.000017',
master_log_pos=980;
Query OK, 0 rows affected, 2 warnings (0.04 sec)

参数解释：
MASTER_HOST : 设置要连接的主服务器的ip地址
MASTER_USER : 设置要连接的主服务器的用户名
MASTER_PASSWORD : 设置要连接的主服务器的密码
MASTER_LOG_FILE : 设置要连接的主服务器的bin日志的日志名称
MASTER_LOG_POS : 设置要连接的主服务器的bin日志的记录位置
-- 启动slave 状态(开始监听msater的变化)
mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)
-- 查看slave的状态.
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.219.24.25
Master_User: slave26
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: binlog.000017
Read_Master_Log_Pos: 980
Relay_Log_File: relay.000002
Relay_Log_Pos: 280
Relay_Master_Log_File: binlog.000017
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 980
Relay_Log_Space: 443
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 25
Master_UUID: 29d68531-4cf9-11e7-8e1f-000c297c4100
Master_Info_File: /data/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)

ERROR:
No query specified

10、 整体测试
10.1 主1数据测试，看其他复制同步情况
-- 主1 创建
mysql> create database m1;
Query OK, 1 row affected (0.11 sec)
-- 主2 查看
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| binarylog |
| m1 |
| mm_repl |
| mysql |
| performance_schema |
| relaylog |
| repl |
| test |
+--------------------+
9 rows in set (0.00 sec)
-- 从1 查看
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| binarylog |
| m1 |
| mm_repl |
| mysql |
| performance_schema |
| relaylog |
| repl |
| test |
+--------------------+
9 rows in set (0.05 sec)

10.2 主2 创建数据，看其他复制同步情况
-- 主2 创建
mysql> use m1;
Database changed
mysql> create table andy(id int);
Query OK, 0 rows affected (0.02 sec)
mysql> insert into andy values(1);
Query OK, 1 row affected (0.00 sec)
-- 主1 查看
mysql> use m1;
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 andy;
+------+
| id |
+------+
| 1 |
+------+
1 row in set (0.00 sec)
-- 从1 查看
mysql> use m1;
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 andy;
+------+
| id |
+------+
| 1 |
+------+
1 row in set (0.00 sec) >成功，双主一从搭建成功！