Mysql 主从复制搭建-极简版
前言
自己在百度、Google一番踩坑搭建成功后，记录一下，也希望后来人不再被这些坑到。
这里为了方便使用 docker，不会的同学请移步相关 Docker 教程。
正文
1. 启动 mysql
#启动 master
docker run --name master -e MYSQL_ROOT_PASSWORD=123456 -d mysql
#启动 slave
docker run --name slave -e MYSQL_ROOT_PASSWORD=123456 -d mysql
备注：--name 是指定容器名称；-e MYSQL_ROOT_PASSWORD 是指定mysql密码
2. 修改 mysql 配置
docker 的正确用法应该是基于mysql镜像，创建两个新的镜像，这里为了简单，直接进入容器修改
修改 master 的 mysql 配置
docker exec -it [master容器id] bash
echo '[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
secure-file-priv= NULL
symbolic-links=0
#启用二进制日志
log-bin=mysql-bin
#设置服务器唯一Id，这里省事直接写1
server-id=1
!includedir /etc/mysql/conf.d/' > /etc/mysql/my.cnf
备注：第二段请一口气复制，它们是一句..
这里因为容器内没有装vim所以使用这种方式，其实就是加上log-bin=mysql-bin和server-id=1这两个配置
修改 slave 的 mysql 配置
其实一样，只是改个server-id
docker exec -it [slave容器id] bash
echo '[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
secure-file-priv= NULL
symbolic-links=0
#启用二进制日志
log-bin=mysql-bin
#设置服务器唯一Id
server-id=2
!includedir /etc/mysql/conf.d/' > /etc/mysql/my.cnf
重启容器
docker restart [master容器id] [slave容器id]
3. 配置同步
登录 master 获取信息
docker exec -it [master容器id] mysql -uroot -p123456
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 155 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
主要记住 mysql-bin.000001 和 155 这两个值，一个是文件，一个是偏移量
登录 slave 设置同步
docker exec -it [slave容器id] mysql -uroot -p123456
mysql> change master to master_host='172.17.0.2',master_user='root',master_log_file='mysql-bin.000001',master_log_pos=155,master_port=3306,master_password='123456';
msql> start slave;
备注：这里的 ip 是 master 的 ip，可以通过 docker inspect [容器id]|grep IPA 查看 IP
4. 检验成功
通过 show slave status\G; 看到
失败了..
Last_IO_Error: error connecting to master 'root@172.17.0.2:3306' - retry-time: 60 retries: 1 message: Authentication plugin 'caching_sha2_password' reported error: Authentication requires secure connection.
不安全的连接？
最后在 Mysql 官网发现端倪，需要先在 slave 上连接 master 获取 public-key，如下
mysql --ssl-mode=DISABLED -h [masterIP] -uroot -p123456 --get-server-public-key
然后重启下 slave 线程
stop slave;
start slave;
查看状态
show slave status\G;
可以看到下面两个yes就说明成功了
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
后记
关于最后那个连接不安全的错误，应该是 mysql8 才有的，不过具体原因还没空去研究
附上操作日志
################【启动mysql】################
deepin@DeepinBook:~$ docker run --name master -e MYSQL_ROOT_PASSWORD=123456 -d mysql
6f0d597fda22325f35eef4d00356238e4058d3dc2122177fe1bdc2a9cca554b2
deepin@DeepinBook:~$ docker run --name slave -e MYSQL_ROOT_PASSWORD=123456 -d mysql
5dca640e2ceb4744a1e85402c50a0134ad981a9cc658f91058bd739c80fb22b4
################【修改mysql配置】#############
deepin@DeepinBook:~$ docker exec -it 6f bash
root@6f0d597fda22:/# cat /etc/mysql/my.cnf
# Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# The MySQL Server configuration file.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
secure-file-priv= NULL
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
# Custom config should go here
!includedir /etc/mysql/conf.d/
root@6f0d597fda22:/# echo '[mysqld]
> pid-file = /var/run/mysqld/mysqld.pid
> socket = /var/run/mysqld/mysqld.sock
> datadir = /var/lib/mysql
> secure-file-priv= NULL
> symbolic-links=0
> log-bin=mysql-bin
> server-id=1
> !includedir /etc/mysql/conf.d/' > /etc/mysql/my.cnf
root@6f0d597fda22:/# cat /etc/mysql/my.cnf
[mysqld]
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
datadir = /var/lib/mysql
secure-file-priv= NULL
symbolic-links=0
log-bin=mysql-bin
server-id=1
!includedir /etc/mysql/conf.d/
root@6f0d597fda22:/# exit
deepin@DeepinBook:~$ docker exec -it 5d bash
root@5dca640e2ceb:/# echo '[mysqld]
> pid-file = /var/run/mysqld/mysqld.pid
> socket = /var/run/mysqld/mysqld.sock
> datadir = /var/lib/mysql
> secure-file-priv= NULL
> symbolic-links=0
> #启用二进制日志
> log-bin=mysql-bin
> #设置服务器唯一Id
> server-id=2
> !includedir /etc/mysql/conf.d/' > /etc/mysql/my.cnf
root@5dca640e2ceb:/#
root@5dca640e2ceb:/#
root@5dca640e2ceb:/# exit
exit
deepin@DeepinBook:~$ docker restart 6f 5d
6f
5d
################【配置主从】#############
deepin@DeepinBook:~$ docker exec -it 6f mysql -uroot -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.17 MySQL Community Server - GPL
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 155 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> exit
Bye
deepin@DeepinBook:~$ docker exec -it 5d mysql -uroot -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.17 MySQL Community Server - GPL
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> change master to master_host='172.17.0.2',master_user='root',master_log_file='mysql-bin.000001',master_log_pos=155,master_port=3306,master_password='123456';
Query OK, 0 rows affected, 2 warnings (0.04 sec)
mysql> start slave;
Query OK, 0 rows affected (0.01 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Connecting to master
Master_Host: 172.17.0.2
Master_User: root
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 155
Relay_Log_File: 5dca640e2ceb-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Connecting
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: 155
Relay_Log_Space: 155
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: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 2061
Last_IO_Error: error connecting to master 'root@172.17.0.2:3306' - retry-time: 60 retries: 8 message: Authentication plugin 'caching_sha2_password' reported error: Authentication requires secure connection.
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 0
Master_UUID:
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp: 191008 10:43:52
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
1 row in set (0.00 sec)
ERROR:
No query specified
mysql> exit
Bye
deepin@DeepinBook:~$ docker exec -it 5d bash
root@5dca640e2ceb:/# mysql --ssl-mode=DISABLED -h172.17.0.2 -uroot -p123456 --get-server-public-key
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 20
Server version: 8.0.17 MySQL Community Server - GPL
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> exit
Bye
root@5dca640e2ceb:/# mysql -uroot -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 11
Server version: 8.0.17 MySQL Community Server - GPL
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Connecting to master
Master_Host: 172.17.0.2
Master_User: root
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 155
Relay_Log_File: 5dca640e2ceb-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Connecting
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: 155
Relay_Log_Space: 155
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: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 2061
Last_IO_Error: error connecting to master 'root@172.17.0.2:3306' - retry-time: 60 retries: 11 message: Authentication plugin 'caching_sha2_password' reported error: Authentication requires secure connection.
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 0
Master_UUID:
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp: 191008 10:46:52
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
1 row in set (0.00 sec)
ERROR:
No query specified
mysql> stop slave;
Query OK, 0 rows affected (0.01 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 172.17.0.2
Master_User: root
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 155
Relay_Log_File: 5dca640e2ceb-relay-bin.000002
Relay_Log_Pos: 322
Relay_Master_Log_File: mysql-bin.000001
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: 155
Relay_Log_Space: 537
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: 1
Master_UUID: 48507a05-e9b2-11e9-ae20-0242ac110002
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
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
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
1 row in set (0.00 sec)
ERROR:
No query specified
