mysql主從基於docker和django實現讀寫分離

mkdir  /home/mysql/data/
touch /home/mysql/conf.d
touch /home/mysql/my.cnf
 
mkdir  /home/mysql2/data/
touch /home/mysql/conf.d
touch /home/mysql/my.cnf

[mysqld]
user=mysql
character-set-server=utf8
default_authentication_plugin=mysql_native_password
secure_file_priv=/var/lib/mysql
expire_logs_days=7
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
max_connections=1000
server-id=100  
log-bin=mysql-bin
[client]
default-character-set=utf8
[mysql]
default-character-set=utf8

[mysqld]
user=mysql
character-set-server=utf8
default_authentication_plugin=mysql_native_password
secure_file_priv=/var/lib/mysql
expire_logs_days=7
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
max_connections=1000
server-id=101 
log-bin=mysql-slave-bin
relay_log=edu-mysql-relay-bin
[client]
default-character-set=utf8
[mysql]
default-character-set=utf8

#啟動主庫容器（掛載外部目錄，端口映射成33307，密碼設置為123456）
docker run  -di -v /home/mysql/data/:/var/lib/mysql -v /home/mysql/conf.d:/etc/mysql/conf.d -v /home/mysql/my.cnf:/etc/mysql/my.cnf -p 33307:3306 --name mysql-master -e MYSQL_ROOT_PASSWORD=123456 mysql:5.7
#啟動從庫容器（掛載外部目錄，端口映射成33306，密碼設置為123456）
docker run  -di -v /home/mysql2/data/:/var/lib/mysql -v /home/mysql2/conf.d:/etc/mysql/conf.d -v /home/mysql2/my.cnf:/etc/mysql/my.cnf -p 33306:3306 --name mysql-slave -e MYSQL_ROOT_PASSWORD=123456 mysql:5.7

#在主庫創建用戶並授權
##創建test用戶
create user 'test'@'%' identified by '123';
##授權用戶
grant all privileges on *.* to 'test'@'%' ;
###刷新權限
flush privileges;
#查看主服務器狀態(顯示如下圖)
show master status;
# 可以看到日志文件的名字，和現在處在哪個位置

#連接從庫
mysql -h 172.16.209.100 -P 33306 -u root -p123456
#配置詳解
/*
change master to 
master_host='MySQL主服務器IP地址', 
master_user='之前在MySQL主服務器上面創建的用戶名'， 
master_password='之前創建的密碼', 
master_log_file='MySQL主服務器狀態中的二進制文件名', 
master_log_pos='MySQL主服務器狀態中的position值';
*/
# 輸入命令如下
change master to master_host='101.133.225.166',master_port=33307,master_user='test',master_password='123',master_log_file='mysql-bin.000003',master_log_pos=0;
# 啟用從庫
start slave;
# 查看從庫狀態（如下圖）
show slave status\G;
####這兩個是yes表示配成功 ####
   Slave_IO_Running: Yes
   Slave_SQL_Running: Yes

#在主庫上創建數據庫test1
create database test1;
use test1;
#創建表
create table tom (id int not null,name varchar(100)not null ,age tinyint);
#插入數據
insert tom (id,name,age) values(1,'xxx',20),(2,'yyy',7),(3,'zzz',23);

#1  在setting中配置
DATABASES = {
    # 主庫
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'lqz1',
        'USER': 'root',
        'PASSWORD': '123456',
        'HOST': '101.133.225.166',
        'PORT': 33307,
    },
    # 從庫
    'db1': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'lqz1',
        'USER': 'root',
        'PASSWORD': '123456',
        'HOST': '101.133.225.166',
        'PORT': 33306,
    },
}

####手動來做
    # 向default庫寫，主庫
    res=models.Book.objects.using('default').create(name='金瓶梅',price=33.4)
    # 去從庫查
    res=models.Book.objects.using('db1').all().first()
    print(res.name)

class Router1:
    def db_for_read(self, model, **hints):
        return 'db1'
    def db_for_write(self, model, **hints):
        return 'default'

# 註冊一下 # 4 以後隻要是寫操作，就會用default，隻要是讀操作自動去db1
	DATABASE_ROUTERS = ['db_router.Router1',]

class Router1:
    def db_for_read(self, model, **hints):
        if model._meta.model_name == 'book':
            return 'db1'
        else:
            return 'default'
 
    def db_for_write(self, model, **hints):
        return 'default'

# django默認是default
python manage.py migrate app01 --database=default