一、安装docker
1、下载dockeryum源文件
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo2、安装docker
yum install -y docker-ce3、启动docker并加入自启
systemctl enable docker
systemctl start docker4、查看版本
docker --version5、修改docker仓库地址
cat > /etc/docker/daemon.json << EOF
{
"registry-mirrors": [
"https://1nj0zren.mirror.aliyuncs.com",
"https://kfwkfulq.mirror.aliyuncs.com",
"https://2lqq34jg.mirror.aliyuncs.com",
"https://pee6w651.mirror.aliyuncs.com",
"http://hub-mirror.c.163.com",
"https://docker.mirrors.ustc.edu.cn",
"http://f1361db2.m.daocloud.io",
"https://registry.docker-cn.com"
]
}
EOF
systemctl restart docker二、部署mysql
1、首先拉取docker镜像,我们这里使用5.7.35版本的mysql
docker pull mysql:5.7.352、启动容器，分别启动两个容器
Master(主)：
docker run -p 3306:3306 --name mysql-master -v /data/docker/mysql-master/data:/var/lib/mysql -v /data/docker/mysql-master/conf:/etc/mysql/conf.d -e MYSQL_ROOT_PASSWORD=123456 -d mysql:5.7.35
Slave(从)：
docker run -p 3309:3306 --name mysql-slave -v /data/docker/mysql-slave/data:/var/lib/mysql -v /data/docker/mysql-slave/conf:/etc/mysql/conf.d -e MYSQL_ROOT_PASSWORD=123456 -d mysql:5.7.35
Master对外映射的端口是3306，Slave对外映射的端口是3309。因为docker容器是相互独立的，每个容器有其独立的ip，所以不同容器使用相同的端口并不会冲突。这里我们应该尽量使用mysql默认的3306端口，否则可能会出现无法通过ip连接docker容器内mysql的问题。3、可以直接通过Navicat直接连接
三、配置主从
1、配置Master(主)
#通过命令进入到Master容器内部
docker exec -it 45ad853bc33d /bin/bash
或者
docker exec -it mysql-master /bin/bash2、创建mysql配置文件my.cnf
#切换到/data/docker/mysql-master/conf目录下
vim /data/docker/mysql-master/conf/my.cnf
主节点：
[mysqld]
## 同一局域网内注意要唯一
server-id=100
## 开启二进制日志功能，可以随便取（关键）
log-bin=mysql-bin
## 开启gtid
gtid_mode=on ## (必选)
enforce-gtid-consistency=1 ##（必选）
log_bin=mysql-bin ##（可选）高可用切换，最好开启该功能
log-slave-updates=1 ##（可选）高可用切换，最好打开该功能
从节点：
vim /data/docker/mysql-slave/conf/my.cnf
[mysqld]
## 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=mysql-slave-bin
## relay_log配置中继日志
relay_log=edu-mysql-relay-bin
## 开启gtid
gtid_mode=on ## (必选)
enforce-gtid-consistency=1 ##（必选）
log_bin=mysql-bin ##（可选）高可用切换，最好开启该功能
log-slave-updates=1 ##（可选）高可用切换，最好打开该功能
重启mysql容器
docker restart mysql-master
docker restart mysql-slave3、进入mysql主库，查看gitid开启情况
mysql> show master status;
+------------------+----------+--------------+
| File | Position | Binlog_Do_DB |
+------------------+----------+--------------+
| mysql-bin.000001 | 154 | |
+------------------+----------+--------------+
1 row in set (0.00 sec)
mysql> show variables like '%gtid%';
+----------------------------------+-----------+
| Variable_name | Value |
+----------------------------------+-----------+
| binlog_gtid_simple_recovery | ON |
| enforce_gtid_consistency | ON |
| gtid_executed_compression_period | 1000 |
| gtid_mode | ON |
| gtid_next | AUTOMATIC |
| gtid_owned | |
| gtid_purged | |
| session_track_gtids | OFF |
+----------------------------------+-----------+
8 rows in set (0.01 sec)
mysql> grant Replication slave, Replication client on *.* to 'repl'@'%' identified by '123456'; 创建主从复制的用户4、进入从节点配置主从
#配置主库信息
mysql> change master to master_host='192.168.112.138',master_port=3306,master_user='repl',master_password='123456', master_auto_position = 1;
#启动主动
mysql> start slave;
#查看状态
mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.112.138
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 454
Relay_Log_File: edu-mysql-relay-bin.000002
Relay_Log_Pos: 667
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: 454
Relay_Log_Space: 878
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: 48460b95-0b9a-11ec-96db-0242ac110002
Master_Info_File: /var/lib/mysql/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: 48460b95-0b9a-11ec-96db-0242ac110002:1
Executed_Gtid_Set: 48460b95-0b9a-11ec-96db-0242ac110002:1
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
# 查看只读状态
mysql> show variables like '%read_only%';
+-----------------------+-------+
| Variable_name | Value |
+-----------------------+-------+
| innodb_read_only | OFF |
| read_only | OFF |
| super_read_only | OFF |
| transaction_read_only | OFF |
| tx_read_only | OFF |
+-----------------------+-------+
5 rows in set (0.01 sec)
# 从库设置只读
mysql> set global read_only=1;
Query OK, 0 rows affected (0.00 sec)5、测试
mysql> select user,host from mysql.user;
+---------------+-----------+
| user | host |
+---------------+-----------+
| repl | % |
| root | % |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
+---------------+-----------+
5 rows in set (0.00 sec)可以看到主库上repl这个用于主从同步的用户已经同步过来了。
#主库创建数据库
mysql> create database nacos;
Query OK, 1 row affected (0.00 sec)
#从库查看
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| nacos |
| performance_schema |
| sys |
+--------------------+
5 rows in set (0.00 sec)已经存在nacos的数据库了，到这里mysql主从同步就配置完成了。
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