主从架构
从该系统架构中，可以看出：
（1）、数据库从之前的单节点变为多节点提供服务
（2）、主节点数据，同步到从节点数据
（3）、应用程序需要连接到 2个数据库节点，并且在程序内部实现判断读写操作
一、准备挂载文件
为了将配置文件在宿主机做挂载，先运行测试镜像拷贝配置文件
1、拉取镜像
docker pull mysql:8.0.26
2、创建测试容器mysql-demo
docker run -it -p 3300:3306 \ --name mysql-demo \ -e MYSQL_ROOT_PASSWORD=123456 \ -d mysql:8.0.26
运行时改成一排执行：
docker run -it -p 3300:3306 --name mysql-demo -e MYSQL_ROOT_PASSWORD=123456 -d mysql:8.0.26
3、在root目录下创建mysql-master文件夹，在mysql-master文件夹下创建conf和data文件夹。
mkdir mysql-master
mkdir -p ~/mysql-master/conf ~/mysql-master/data
4、将mysql-demo容器内的/etc/mysql/my.cnf文件拷贝到~/mysql-master/conf目录下
docker cp mysql-demo:/etc/mysql/my.cnf ~/mysql-master/conf
5、将mysql-master中的内容全部拷贝到mysql-slave中
cp -r ~/mysql-master ~/mysql-slave1
cp -r ~/mysql-master ~/mysql-slave2
cp -r ~/mysql-master ~/mysql-slave3
6、停止并删除测试容器
docker stop mysql-demo docker rm mysql-demo
二、创建自定义网络
默认的bridge 网桥无法指定固定的ip，会导致mysql服务的ip不固定，最好配置为自定义网络
docker network create --driver bridge --subnet 192.172.0.0/16 --gateway 192.172.0.1 newnet
查看网络
[root@xxx conf]# docker network ls NETWORK ID NAME DRIVER SCOPE dfd016599931 bridge bridge local 9951733f6b75 host host local 8efcdae3efd4 newnet bridge local 9eae2373bc1f none null local
三、创建主从容器
创建两个自定义网路的MySQL容器，使用newnet定义IP时，前面两个数字要与newnet的对应，后面两个可以随便指定，但不能超过255
1、创建主容器
docker run -it -p 3301:3306 \ --name mysql-master \ --net newnet --ip 192.172.0.30 \ -v ~/mysql-master/conf/my.cnf:/etc/mysql/my.cnf \ -v ~/mysql-master/data:/var/lib/mysql \ --privileged=true \ --restart=always \ -e MYSQL_ROOT_PASSWORD=123456 \ -e TZ=Asia/Shanghai \ mysql:8.0.26
执行时去掉\改成一排
docker run -it -p 3301:3306 --name mysql-master --net newnet --ip 192.172.0.30 -v ~/mysql-master/conf/my.cnf:/etc/mysql/my.cnf -v ~/mysql-master/data:/var/lib/mysql --privileged=true --restart=always -e MYSQL_ROOT_PASSWORD=123456 -e TZ=Asia/Shanghai mysql:8.0.26
控制台打印日志如下：
[root@xxx conf]# docker run -it -p 3301:3306 --name mysql-master --net newnet --ip 192.172.0.30 -v ~/mysql-master/conf/my.cnf:/etc/mysql/my.cnf -v ~/mysql-master/data:/var/lib/mysql --privileged=true --restart=always -e MYSQL_ROOT_PASSWORD=123456 -e TZ=Asia/Shanghai mysql:8.0.26 2022-07-23 09:58:48+08:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.26-1debian10 started. 2022-07-23 09:58:48+08:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql' 2022-07-23 09:58:48+08:00 [Note] [Entrypoint]: Entrypoint script for MySQL Server 8.0.26-1debian10 started. 2022-07-23 09:58:48+08:00 [Note] [Entrypoint]: Initializing database files 2022-07-23T01:58:48.354370Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.26) initializing of server in progress as process 43 2022-07-23T01:58:48.363794Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started. 2022-07-23T01:58:49.105917Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended. 2022-07-23T01:58:50.972408Z 0 [Warning] [MY-013746] [Server] A deprecated TLS version TLSv1 is enabled for channel mysql_main 2022-07-23T01:58:50.972752Z 0 [Warning] [MY-013746] [Server] A deprecated TLS version TLSv1.1 is enabled for channel mysql_main 2022-07-23T01:58:51.081275Z 6 [Warning] [MY-010453] [Server] root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option. 2022-07-23 09:58:55+08:00 [Note] [Entrypoint]: Database files initialized 2022-07-23 09:58:55+08:00 [Note] [Entrypoint]: Starting temporary server mysqld will log errors to /var/lib/mysql/f0d909d9adcb.err mysqld is running as pid 94 2022-07-23 09:58:56+08:00 [Note] [Entrypoint]: Temporary server started. Warning: Unable to load '/usr/share/zoneinfo/iso3166.tab' as time zone. Skipping it. Warning: Unable to load '/usr/share/zoneinfo/leap-seconds.list' as time zone. Skipping it. Warning: Unable to load '/usr/share/zoneinfo/zone.tab' as time zone. Skipping it. Warning: Unable to load '/usr/share/zoneinfo/zone1970.tab' as time zone. Skipping it. 2022-07-23 09:58:58+08:00 [Note] [Entrypoint]: Stopping temporary server 2022-07-23 09:59:01+08:00 [Note] [Entrypoint]: Temporary server stopped 2022-07-23 09:59:01+08:00 [Note] [Entrypoint]: MySQL init process done. Ready for start up. 2022-07-23T01:59:01.295583Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.26) starting as process 1 2022-07-23T01:59:01.306472Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started. 2022-07-23T01:59:01.508782Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended. 2022-07-23T01:59:01.729201Z 0 [Warning] [MY-013746] [Server] A deprecated TLS version TLSv1 is enabled for channel mysql_main 2022-07-23T01:59:01.729347Z 0 [Warning] [MY-013746] [Server] A deprecated TLS version TLSv1.1 is enabled for channel mysql_main 2022-07-23T01:59:01.730375Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed. 2022-07-23T01:59:01.730543Z 0 [System] [MY-013602] [Server] Channel mysql_main configured to support TLS. Encrypted connections are now supported for this channel. 2022-07-23T01:59:01.734139Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory. 2022-07-23T01:59:01.753416Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Bind-address: '::' port: 33060, socket: /var/run/mysqld/mysqlx.sock 2022-07-23T01:59:01.753477Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.26' socket: '/var/run/mysqld/mysqld.sock' port: 3306 MySQL Community Server - GPL.
2、创建三个从容器
docker run -it -p 3302:3306 \ --name mysql-slave1 \ --net newnet --ip 192.172.0.31 \ -v ~/mysql-slave1/conf/my.cnf:/etc/mysql/my.cnf \ -v ~/mysql-slave1/data:/var/lib/mysql \ --privileged=true \ --restart=always \ -e MYSQL_ROOT_PASSWORD=123456 \ -e TZ=Asia/Shanghai \ mysql:8.0.26
执行时去掉\改为一行执行
docker run -it -p 3302:3306 --name mysql-slave1 --net newnet --ip 192.172.0.31 -v ~/mysql-slave1/conf/my.cnf:/etc/mysql/my.cnf -v ~/mysql-slave1/data:/var/lib/mysql --privileged=true --restart=always -e MYSQL_ROOT_PASSWORD=123456 -e TZ=Asia/Shanghai mysql:8.0.26 docker run -it -p 3303:3306 --name mysql-slave2 --net newnet --ip 192.172.0.32 -v ~/mysql-slave2/conf/my.cnf:/etc/mysql/my.cnf -v ~/mysql-slave2/data:/var/lib/mysql --privileged=true --restart=always -e MYSQL_ROOT_PASSWORD=123456 -e TZ=Asia/Shanghai mysql:8.0.26 docker run -it -p 3304:3306 --name mysql-slave3 --net newnet --ip 192.172.0.33 -v ~/mysql-slave3/conf/my.cnf:/etc/mysql/my.cnf -v ~/mysql-slave3/data:/var/lib/mysql --privileged=true --restart=always -e MYSQL_ROOT_PASSWORD=123456 -e TZ=Asia/Shanghai mysql:8.0.26
此时已经启动了四个容器mysql-master和mysql-slave1、mysql-slave2、mysql-slave3
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES ce70f22a2cfc mysql:8.0.26 "docker-entrypoint.s…" 44 seconds ago Up 43 seconds 33060/tcp, 0.0.0.0:3304->3306/tcp, :::3304->3306/tcp mysql-slave3 bc042e5c2316 mysql:8.0.26 "docker-entrypoint.s…" About a minute ago Up About a minute 33060/tcp, 0.0.0.0:3303->3306/tcp, :::3303->3306/tcp mysql-slave2 dda81d5cae65 mysql:8.0.26 "docker-entrypoint.s…" 3 minutes ago Up 3 minutes 33060/tcp, 0.0.0.0:3302->3306/tcp, :::3302->3306/tcp mysql-slave1 f3d96b38f6bb mysql:8.0.26 "docker-entrypoint.s…" 5 minutes ago Up 5 minutes 33060/tcp, 0.0.0.0:3301->3306/tcp, :::3301->3306/tcp mysql-master
查看newnet网络
命令：
docker network inspect newnet
部分结果如下：
"Containers": { "bc042e5c23161e48cc54bdf6d818b20b97062035358f1a7e698628b81ef610f3": { "Name": "mysql-slave2", "EndpointID": "983bb94b217cf73b2e9b8a0fcffc20d6c3d37bc8699dcd8848be845cb80be42d", "MacAddress": "02:42:c0:ac:00:20", "IPv4Address": "192.172.0.32/16", "IPv6Address": "" }, "ce70f22a2cfc1e85cf3a23c7979e75cdbe538a76867d14a65378056460f1d3ce": { "Name": "mysql-slave3", "EndpointID": "78d0f1d87c2c231178eceace404b15051ca5601724fc5f0b2c0e6f493003d7d1", "MacAddress": "02:42:c0:ac:00:21", "IPv4Address": "192.172.0.33/16", "IPv6Address": "" }, "dda81d5cae653bbf6611f27be7a3f44c9c3214750233b77b31d7a3aa75cd9b01": { "Name": "mysql-slave1", "EndpointID": "0db304928fc343e81e17c6e9371392d3d080f980d185765cc06580325b1e9244", "MacAddress": "02:42:c0:ac:00:1f", "IPv4Address": "192.172.0.31/16", "IPv6Address": "" }, "f3d96b38f6bb47c7a7b70c7472a97010e7262fa4f422d59ef5dedbcfaf8b4679": { "Name": "mysql-master", "EndpointID": "04848f2d83932d0d07634a921bef961f2fef4b1e768a2fc730917bfd75001d22", "MacAddress": "02:42:c0:ac:00:1e", "IPv4Address": "192.172.0.30/16", "IPv6Address": "" } },
如果是云服务器，则要在安全组放开3301、3302、3303、3304端口。
本地电脑的navicat访问mysql-master
发现该数据库中已经有了msyql自带的四个数据库。
3、修改主容器的my.conf文件
在宿主机中，配置mysql-master挂载的my.cnf文件
编辑my.cnf文件
vim ~/mysql-master/conf/my.cnf
在my.cnf文件中放入如下内容
server-id=100 log-bin=master-bin #开启二进制文件 #binlog-do-db=demo #需要同步的二进制数据库名； binlog-ignore-db=information_schema #不同步的二进制数据库名,如果不设置可以将其注释掉; binlog-ignore-db=mysql binlog-ignore-db=performance_schema binlog-ignore-db=sys #log-slave-update #这个是把更新的记录写到二进制文件中；
如下所示：
# 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
# Custom config should go here
!includedir /etc/mysql/conf.d/
server-id=100
log-bin=master-bin
#binlog-do-db=demo
binlog-ignore-db=information_schema
binlog-ignore-db=mysql
binlog-ignore-db=performance_schema
binlog-ignore-db=sys
#log-slave-update
server-id: 唯一服务器ID不能和其他服务器的server-id重复;
log-bin文件的命名方式： 名称为hostname-bin.xxxxx （重启mysql一次将会自动生成一个新的binlog）
4、重启mysql-master使配置生效
配置完成后，需要重启mysql-master容器使其修改的配置文件生效，使用如下命令使mysql进行重启
docker restart mysql-master
四、配置mysql-slave1、mysql-slave2、mysql-slave3的my.cnf文件
相同方法配置mysql-slave挂载的my.cnf文件
1、编辑my.cnf文件
vim ~/mysql-slave1/conf/my.cnf
2、添加如下配置
# 设置server_id,注意要唯一 server-id=101 # 开启二进制日志功能，以备Slave作为其它Slave的Master时使用 log-bin=slave1-bin # relay_log配置中继日志 relay_log=/var/lib/mysql/relay.log read_only=1 # 设置为只读,该项如果不设置，表示slave可读可写
relay_log的作用：
master主节点的binlog传到slave从节点后，被写到relay log里，从节点的slave sql线程从relaylog里读取日志然后应用到slave从节点本地。即从服务器I/O线程将主服务器的二进制日志读取过来记录到从服务器本地文件，然后SQL线程会读取relay-log日志的内容并应用到从服务器，从而使从服务器和主服务器的数据保持一致。
它的作用可以参考如下图，从图片中可以看出，它是一个中介临时的日志文件，用于存储从master节点同步过来的binlog日志内容，它里面的内容和master节点的binlog日志里面的内容是一致的。然后slave从节点从这个relaylog日志文件中读取数据应用到数据库中，来实现数据的主从复制。
如下所示：
# 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 # Custom config should go here !includedir /etc/mysql/conf.d/ # 设置server_id,注意要唯一 server-id=101 # 开启二进制日志功能，以备Slave作为其它Slave的Master时使用 log-bin=slave1-bin # relay_log配置中继日志 relay_log=/var/lib/mysql/relay.log read_only=1 # 设置为只读,该项如果不设置，表示slave可读可写
replicate-do-db=nacos_config
注意：一定要加上replicate-do-db，否则后面会报错：Last_Error: Error 'Unknown database，后面会讲到。
3、重启mysql-slave1容器
docker restart mysql-slave1
其余两个从容器进行相同操作
mysql-slave2
vim ~/mysql-slave2/conf/my.cnf
配置
server-id=102 log-bin=slave2-bin relay_log=/var/lib/mysql/slave2-relay.log read_only=1 replicate-do-db=nacos_config
重启：
docker restart mysql-slave2
mysql-slave3
vim ~/mysql-slave3/conf/my.cnf
配置
server-id=103
log-bin=slave3-bin
relay_log=/var/lib/mysql/slave3-relay.log
read_only=1
replicate-do-db=nacos_config
重启：
docker restart mysql-slave3
五、创建用户并授权
在Master数据库创建数据同步用户，授予用户 slave REPLICATION SLAVE权限和REPLICATION CLIENT权限，用于在主从库之间同步数据。
1、进入mysql-master容器
docker exec -it mysql-master bash
2、登录mysql-master
mysql -uroot -p123456
3、创建slave用户
create user 'slave'@'%' IDENTIFIED WITH mysql_native_password BY 'slave';
4、授予slave用户REPLICATION SLAVE权限和REPLICATION CLIENT权限
GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'slave'@'%';
5、刷新
flush privileges;
6、查看权限
SHOW GRANTS FOR 'slave'@'%';
结果
mysql> SHOW GRANTS FOR 'slave'@'%'; +-------------------------------------------------------------------+ | Grants for slave@% | +-------------------------------------------------------------------+ | GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO `slave`@`%` | +-------------------------------------------------------------------+ 1 row in set (0.00 sec)
表示授权成功!
7、进入mysql-slave容器，以slave账号连接mysql-master。
[root@xxx ~]# docker exec -it mysql-slave1 bash root@7f7b489358dc:/# mysql -h192.172.0.30 -uslave -pslave 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 35 Server version: 8.0.26 MySQL Community Server - GPL Copyright (c) 2000, 2021, Oracle and/or its affiliates. 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>
说明从服务器通过账号slave，密码slave可以连接mysql-master容器。
8、查看Master状态
show master status;
结果如下：
mysql> show master status; +-------------------+----------+--------------+-------------------------------------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +-------------------+----------+--------------+-------------------------------------------------+-------------------+ | master-bin.000001 | 848 | | information_schema,mysql,performance_schema,sys | | +-------------------+----------+--------------+-------------------------------------------------+-------------------+ 1 row in set (0.00 sec)
记住File和Position，后面需要用到。此时一定不要操作Master库，否则将会引起Master状态的变化，File和Position字段也将会进行变化。
六、开启主从复制
进入到mysql-slave容器的mysql客户端，执行如下命令：
注：mysqld 是 MySQL 的主程序，服务器端。mysql 是 MySQL 的命令行工具，客户端。
1、进入mysql-slave1容器
docker exec -it mysql-slave1 bash
2、登录
mysql -uroot -p123456
3、执行如下命令
在进行mysql主从复制配置时，change master用于配置和改变slave服务器用于连接master服务器的参数，以便slave服务器读取master服务器的binlog以及slave服务器的relay log，同时更新master.info和relay-log.info信息。
注意:执行该语句之前，从服务器上如果IO线程和SQL线程已经启动，需要先停止，执行stop slave命令。
change master to master_host='192.172.0.30', master_user='slave', master_password='slave', master_port=3306, master_log_file='master-bin.000001', master_log_pos=848, master_connect_retry=30;
master_log_pos 此参数决定从库复制主库binlog的起始位置。
执行时放在一行执行
change master to master_host='192.172.0.30', master_user='slave', master_password='slave', master_port=3306, master_log_file='master-bin.000001', master_log_pos=848, master_connect_retry=30;
命令说明：
4、查看主从同步状态
mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 192.172.0.30
Master_User: slave
Master_Port: 3306
Connect_Retry: 30
Master_Log_File: master-bin.000001
Read_Master_Log_Pos: 681
Relay_Log_File: relay.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: master-bin.000001
Slave_IO_Running: No
Slave_SQL_Running: No
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: 681
Relay_Log_Space: 156
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: 0
Last_IO_Error:
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:
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, 1 warning (0.00 sec)
ERROR:
No query specified
mysql replication 中slave机器上有两个关键的进程，死一个都不行，一个是slave_sql_running，一个是Slave_IO_Running，一个负责与主机的io通信，一个负责自己的slave mysql进程。Slave_IO_Running: no 表示从主库读取数据的IO不通。
如果Slave_SQL_Running:显示为No，请检查宿主机~/mysql-master/data/auto.cnf 与~/mysql-slave/data/auto.cnf 是否相同，若相同，请根据容器中mysql命令select uuid();进行修改。
查看~/mysql-master/data/auto.cnf
[root@xxx ~]# cat ~/mysql-master/data/auto.cnf [auto] server-uuid=fdef6cc7-0a2a-11ed-a3d3-0242c0ac001e
查看~/mysql-slave/data/auto.cnf
[root@xxx ~]# cat ~/mysql-slave/data/auto.cnf [auto] server-uuid=9eadc9d0-0a2b-11ed-8fc7-0242c0ac001f
发现不同。
如果不同，则执行如下命令
mysql> stop slave; Query OK, 0 rows affected, 2 warnings (0.00 sec) mysql> SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> START SLAVE; Query OK, 0 rows affected, 1 warning (0.01 sec)
start slave表示开启主从复制，
再次查看主从同步状态
mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for source to send event Master_Host: 192.172.0.30 Master_User: slave Master_Port: 3306 Connect_Retry: 30 Master_Log_File: master-bin.000001 Read_Master_Log_Pos: 848 Relay_Log_File: relay.000002 Relay_Log_Pos: 325 Relay_Master_Log_File: master-bin.000001 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: nacos_config Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 1 Exec_Master_Log_Pos: 848 Relay_Log_Space: 524 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: 100 Master_UUID: 46177dae-c94d-11ed-99e6-0242c0ac001e Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Replica 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, 1 warning (0.00 sec)
此时如果Slave_IO_State: Waiting for source to send event，且Slave_IO_Running和Slave_SQL_Running都为YES，表示主从复制成功.
其他两个从容器进行类似操作
mysql-slave2
进入容器
docker exec -it mysql-slave2 bash
执行如下命令
change master to master_host='192.172.0.30', master_user='slave', master_password='slave', master_port=3306, master_log_file='master-bin.000001', master_log_pos=848, master_connect_retry=30;
查看主从同步状态
show slave status \G;
执行如下命令
mysql> stop slave; Query OK, 0 rows affected, 2 warnings (0.00 sec) mysql> SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> START SLAVE; Query OK, 0 rows affected, 1 warning (0.01 sec)
mysql-slave3
进入容器
docker exec -it mysql-slave3 bash
执行如下命令
change master to master_host='192.172.0.30', master_user='slave', master_password='slave', master_port=3306, master_log_file='master-bin.000001', master_log_pos=848, master_connect_retry=30;
查看主从同步状态
show slave status \G;
执行如下命令
mysql> stop slave; Query OK, 0 rows affected, 2 warnings (0.00 sec) mysql> SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1; Query OK, 0 rows affected, 1 warning (0.00 sec) mysql> START SLAVE; Query OK, 0 rows affected, 1 warning (0.01 sec)
七、报错：Last_Error: Error 'Unknown database
本地电脑中navicat登录主容器和从容器
主容器:
此时主容器中有四个库
1、在navicate中执行如下sql语句
CREATE DATABASE nacos_config;
USE nacos_config;
CREATE TABLE `config_info` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
`data_id` varchar(255) NOT NULL COMMENT 'data_id',
`group_id` varchar(255) DEFAULT NULL,
`content` longtext NOT NULL COMMENT 'content',
`md5` varchar(32) DEFAULT NULL COMMENT 'md5',
`gmt_create` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`gmt_modified` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '修改时间',
`src_user` text COMMENT 'source user',
`src_ip` varchar(50) DEFAULT NULL COMMENT 'source ip',
`app_name` varchar(128) DEFAULT NULL,
`tenant_id` varchar(128) DEFAULT '' COMMENT '租户字段',
`c_desc` varchar(256) DEFAULT NULL,
`c_use` varchar(64) DEFAULT NULL,
`effect` varchar(64) DEFAULT NULL,
`type` varchar(64) DEFAULT NULL,
`c_schema` text,
PRIMARY KEY (`id`),
UNIQUE KEY `uk_configinfo_datagrouptenant` (`data_id`,`group_id`,`tenant_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_info';
CREATE TABLE `config_info_aggr` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
`data_id` varchar(255) NOT NULL COMMENT 'data_id',
`group_id` varchar(255) NOT NULL COMMENT 'group_id',
`datum_id` varchar(255) NOT NULL COMMENT 'datum_id',
`content` longtext NOT NULL COMMENT '内容',
`gmt_modified` datetime NOT NULL COMMENT '修改时间',
`app_name` varchar(128) DEFAULT NULL,
`tenant_id` varchar(128) DEFAULT '' COMMENT '租户字段',
PRIMARY KEY (`id`),
UNIQUE KEY `uk_configinfoaggr_datagrouptenantdatum` (`data_id`,`group_id`,`tenant_id`,`datum_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='增加租户字段';
CREATE TABLE `config_info_beta` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
`data_id` varchar(255) NOT NULL COMMENT 'data_id',
`group_id` varchar(128) NOT NULL COMMENT 'group_id',
`app_name` varchar(128) DEFAULT NULL COMMENT 'app_name',
`content` longtext NOT NULL COMMENT 'content',
`beta_ips` varchar(1024) DEFAULT NULL COMMENT 'betaIps',
`md5` varchar(32) DEFAULT NULL COMMENT 'md5',
`gmt_create` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`gmt_modified` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '修改时间',
`src_user` text COMMENT 'source user',
`src_ip` varchar(50) DEFAULT NULL COMMENT 'source ip',
`tenant_id` varchar(128) DEFAULT '' COMMENT '租户字段',
PRIMARY KEY (`id`),
UNIQUE KEY `uk_configinfobeta_datagrouptenant` (`data_id`,`group_id`,`tenant_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_info_beta';
CREATE TABLE `config_info_tag` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
`data_id` varchar(255) NOT NULL COMMENT 'data_id',
`group_id` varchar(128) NOT NULL COMMENT 'group_id',
`tenant_id` varchar(128) DEFAULT '' COMMENT 'tenant_id',
`tag_id` varchar(128) NOT NULL COMMENT 'tag_id',
`app_name` varchar(128) DEFAULT NULL COMMENT 'app_name',
`content` longtext NOT NULL COMMENT 'content',
`md5` varchar(32) DEFAULT NULL COMMENT 'md5',
`gmt_create` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`gmt_modified` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '修改时间',
`src_user` text COMMENT 'source user',
`src_ip` varchar(50) DEFAULT NULL COMMENT 'source ip',
PRIMARY KEY (`id`),
UNIQUE KEY `uk_configinfotag_datagrouptenanttag` (`data_id`,`group_id`,`tenant_id`,`tag_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_info_tag';
CREATE TABLE `config_tags_relation` (
`id` bigint(20) NOT NULL COMMENT 'id',
`tag_name` varchar(128) NOT NULL COMMENT 'tag_name',
`tag_type` varchar(64) DEFAULT NULL COMMENT 'tag_type',
`data_id` varchar(255) NOT NULL COMMENT 'data_id',
`group_id` varchar(128) NOT NULL COMMENT 'group_id',
`tenant_id` varchar(128) DEFAULT '' COMMENT 'tenant_id',
`nid` bigint(20) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`nid`),
UNIQUE KEY `uk_configtagrelation_configidtag` (`id`,`tag_name`,`tag_type`),
KEY `idx_tenant_id` (`tenant_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='config_tag_relation';
CREATE TABLE `group_capacity` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键ID',
`group_id` varchar(128) NOT NULL DEFAULT '' COMMENT 'Group ID，空字符表示整个集群',
`quota` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '配额，0表示使用默认值',
`usage` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '使用量',
`max_size` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个配置大小上限，单位为字节，0表示使用默认值',
`max_aggr_count` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '聚合子配置最大个数，，0表示使用默认值',
`max_aggr_size` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个聚合数据的子配置大小上限，单位为字节，0表示使用默认值',
`max_history_count` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '最大变更历史数量',
`gmt_create` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`gmt_modified` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '修改时间',
PRIMARY KEY (`id`),
UNIQUE KEY `uk_group_id` (`group_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='集群、各Group容量信息表';
CREATE TABLE `his_config_info` (
`id` bigint(64) unsigned NOT NULL,
`nid` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`data_id` varchar(255) NOT NULL,
`group_id` varchar(128) NOT NULL,
`app_name` varchar(128) DEFAULT NULL COMMENT 'app_name',
`content` longtext NOT NULL,
`md5` varchar(32) DEFAULT NULL,
`gmt_create` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
`gmt_modified` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
`src_user` text,
`src_ip` varchar(50) DEFAULT NULL,
`op_type` char(10) DEFAULT NULL,
`tenant_id` varchar(128) DEFAULT '' COMMENT '租户字段',
PRIMARY KEY (`nid`),
KEY `idx_gmt_create` (`gmt_create`),
KEY `idx_gmt_modified` (`gmt_modified`),
KEY `idx_did` (`data_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='多租户改造';
CREATE TABLE `tenant_capacity` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键ID',
`tenant_id` varchar(128) NOT NULL DEFAULT '' COMMENT 'Tenant ID',
`quota` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '配额，0表示使用默认值',
`usage` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '使用量',
`max_size` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个配置大小上限，单位为字节，0表示使用默认值',
`max_aggr_count` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '聚合子配置最大个数',
`max_aggr_size` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '单个聚合数据的子配置大小上限，单位为字节，0表示使用默认值',
`max_history_count` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '最大变更历史数量',
`gmt_create` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`gmt_modified` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '修改时间',
PRIMARY KEY (`id`),
UNIQUE KEY `uk_tenant_id` (`tenant_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='租户容量信息表';
CREATE TABLE `tenant_info` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
`kp` varchar(128) NOT NULL COMMENT 'kp',
`tenant_id` varchar(128) default '' COMMENT 'tenant_id',
`tenant_name` varchar(128) default '' COMMENT 'tenant_name',
`tenant_desc` varchar(256) DEFAULT NULL COMMENT 'tenant_desc',
`create_source` varchar(32) DEFAULT NULL COMMENT 'create_source',
`gmt_create` bigint(20) NOT NULL COMMENT '创建时间',
`gmt_modified` bigint(20) NOT NULL COMMENT '修改时间',
PRIMARY KEY (`id`),
UNIQUE KEY `uk_tenant_info_kptenantid` (`kp`,`tenant_id`),
KEY `idx_tenant_id` (`tenant_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='tenant_info';
CREATE TABLE `users` (
`username` varchar(50) NOT NULL PRIMARY KEY,
`password` varchar(500) NOT NULL,
`enabled` boolean NOT NULL
);
CREATE TABLE `roles` (
`username` varchar(50) NOT NULL,
`role` varchar(50) NOT NULL,
UNIQUE INDEX `idx_user_role` (`username` ASC, `role` ASC) USING BTREE
);
CREATE TABLE `permissions` (
`role` varchar(50) NOT NULL,
`resource` varchar(255) NOT NULL,
`action` varchar(8) NOT NULL,
UNIQUE INDEX `uk_role_permission` (`role`,`resource`,`action`) USING BTREE
);
INSERT INTO users (username, password, enabled) VALUES ('nacos', '$2a$10$EuWPZHzz32dJN7jexM34MOeYirDdFAZm2kuWj7VEOJhhZkDrxfvUu', TRUE);
INSERT INTO roles (username, role) VALUES ('nacos', 'ROLE_ADMIN');
主容器的数据库如下：
2、此时查看从容器的数据库，发现同步没有成功，仍然是四个库
此时进入从容器查看主从同步状态
mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for source to send event
Master_Host: 192.172.0.30
Master_User: slave
Master_Port: 3306
Connect_Retry: 30
Master_Log_File: master-bin.000001
Read_Master_Log_Pos: 12537
Relay_Log_File: relay.000002
Relay_Log_Pos: 534
Relay_Master_Log_File: master-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB: nacos_config
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 1049
Last_Error: Error 'Unknown database 'nacos_config'' on query. Default database: 'nacos_config'. Query: 'CREATE TABLE `config_info` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
`data_id` varchar(255) NOT NULL COMMENT 'data_id',
`group_id` varchar(255) DEFAULT NULL,
`content` longtext NOT NULL COMMENT 'content',
`md5` varchar(32) DEFAULT NULL COMMENT 'md5',
`gmt_create` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`gmt_modified` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '修改时间',
`src_user` text COMMENT 'source user',
`src_ip` varchar(50) DEFAULT NULL COMMENT 'source ip',
`app_name` varchar(128) DEFAULT NULL,
`tenant_id` varchar(128) DEFAULT '' COMMENT '租户字段',
`c_desc` varchar(256) DEFAULT NULL,
`c_use` varchar(64) DEFAULT NULL,
`effect` varchar(64) DEFAULT NULL,
`type` varchar(64) DEFAULT NULL,
`c_schema` text,
PRIMARY KEY (`id`),
UNIQUE KEY `uk_configinfo_datagrouptenant` (`data_id`,`group_id`,`tenant_id`)
)
Skip_Counter: 0
Exec_Master_Log_Pos: 1057
Relay_Log_Space: 12213
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: 0
Last_IO_Error:
Last_SQL_Errno: 1049
Last_SQL_Error: Error 'Unknown database 'nacos_config'' on query. Default database: 'nacos_config'. Query: 'CREATE TABLE `config_info` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'id',
`data_id` varchar(255) NOT NULL COMMENT 'data_id',
`group_id` varchar(255) DEFAULT NULL,
`content` longtext NOT NULL COMMENT 'content',
`md5` varchar(32) DEFAULT NULL COMMENT 'md5',
`gmt_create` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`gmt_modified` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '修改时间',
`src_user` text COMMENT 'source user',
`src_ip` varchar(50) DEFAULT NULL COMMENT 'source ip',
`app_name` varchar(128) DEFAULT NULL,
`tenant_id` varchar(128) DEFAULT '' COMMENT '租户字段',
`c_desc` varchar(256) DEFAULT NULL,
`c_use` varchar(64) DEFAULT NULL,
`effect` varchar(64) DEFAULT NULL,
`type` varchar(64) DEFAULT NULL,
`c_schema` text,
PRIMARY KEY (`id`),
UNIQUE KEY `uk_configinfo_datagrouptenant` (`data_id`,`group_id`,`tenant_id`)
)
Replicate_Ignore_Server_Ids:
Master_Server_Id: 100
Master_UUID: 88e25bde-c942-11ed-ab5f-0242c0ac001e
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp: 230323 14:25:52
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, 1 warning (0.01 sec)
ERROR:
No query specified
3、我们先在三个从容器中创建nacos_config数据库
CREATE DATABASE nacos_config;
如下所示：
此时nacos_config库中没有表。
4、进入mysql-slave1容器，停掉从库的slave
stop slave;
再执行
start slave;
此时发现从数据库中表如下：
其他两个从容器进行相同操作。
修改主容器nacos_config数据库中的users表中的数据：
update users set enabled = 2 where username='nacos';
查看三个从容器中users表的数据
说明同步成功！
