使用python3搭建Linux-mariadb主从架构

环境准备两台：

192.168.193.90 master

192.168.193.91 slave

需要Linux装python环境：

https://www.cnblogs.com/kingzhe/p/11124527.html

在做主从时，要保证两个数据库的信息一致

[root@node1 ~]# mysql_secure_installation

[root@node2 ~]# mysql_secure_installation

master

import configparser
import os
def config_mariadb_yum():
    exists = os.path.exists('/etc/yum.repos.d/mariadb.repo')
    if exists:
        print('mariadb.repo exist')
        yum_install_mariadb()
    else:
        config = configparser.ConfigParser()
        config.read('/etc/yum.repos.d/mariadb.repo', encoding='utf-8')
        config.add_section('mariadb')
        config.set('mariadb', 'name', 'MariaDB')
        config.set('mariadb', 'baseurl', 'http://mirrors.ustc.edu.cn/mariadb/yum/10.3/centos7-amd64/')
        config.set('mariadb', 'gpgkey', 'http://mirrors.ustc.edu.cn/mariadb/yum/RPM-GPG-KEY-MariaDB')
        config.set('mariadb', 'gpgcheck', '1')
        config.write(open("/etc/yum.repos.d/mariadb.repo", "w"))
        yum_install_mariadb()

def yum_install_mariadb():
        res1 = os.system('yum install MariaDB -y > /dev/null 2&>1')
        if res1 == 0:
            config = configparser.ConfigParser()
            config.read('/etc/my.cnf.d/server.cnf', encoding='utf-8')
            config.set('server','server_id','1')
            config.set('server','log-bin','mysql-bin')
            config.write(open("/etc/my.cnf.d/server.cnf", "w"))
            res2 = os.system('service mariadb restart')
            if res2 == 0:  
                os.system('''mysql -uroot -proot -e "grant replication slave on *.* to 'slave'@'%' identified by 'slave'"''')
                os.system("mysql -uroot -proot -e 'show master status'")

def main():
    config_mariadb_yum()
if __name__ == '__main__':
    main()

slave

import configparser
import os
master_ip = input('master_ip:').strip()
log_file = input('log_file:').strip()
pos = input('pos:').strip()
def config_mariadb_yum():
    exists = os.path.exists('/etc/yum.repos.d/mariadb.repo')
    if exists:
        print('mariadb.repo exist')
        yum_install_mariadb()
    else:
        config = configparser.ConfigParser()
        config.read('/etc/yum.repos.d/mariadb.repo', encoding='utf-8')
        config.add_section('mariadb')
        config.set('mariadb', 'name', 'MariaDB')
        config.set('mariadb', 'baseurl', 'http://mirrors.ustc.edu.cn/mariadb/yum/10.3/centos7-amd64/')
        config.set('mariadb', 'gpgkey', 'http://mirrors.ustc.edu.cn/mariadb/yum/RPM-GPG-KEY-MariaDB')
        config.set('mariadb', 'gpgcheck', '1')
        config.write(open("/etc/yum.repos.d/mariadb.repo", "w"))
        yum_install_mariadb()

def yum_install_mariadb():
        res1 = os.system('yum install MariaDB -y > /dev/null 2&>1')
        if res1 == 0:
            config = configparser.ConfigParser()
            config.read('/etc/my.cnf.d/server.cnf', encoding='utf-8')
            config.set('server','server_id','2')
            config.write(open("/etc/my.cnf.d/server.cnf", "w"))
            res2 = os.system('service mariadb restart')
            if res2 == 0:
                os.system('''mysql -uroot -proot -e "CHANGE MASTER TO MASTER_HOST='%s', MASTER_USER='slave', MASTER_PASSWORD='slave', MASTER_LOG_FILE='%s', MASTER_LOG_POS=%s"''' % (master_ip,log_file,pos))
                os.system("mysql -uroot -proot -e 'start slave;'")

def main():
    config_mariadb_yum()
if __name__ == '__main__':
    main()

在pycharm写入 rz上传

[root@node1 ~]# python3 1.py

[root@node1 ~]# python3 1.py 
mariadb.repo hhh
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000006 |      530 |              |                  |
+------------------+----------+--------------+------------------+

master成功

 在运行是遇到的报错

[root@node1 ~]# python 1.py 
Traceback (most recent call last):
  File "1.py", line 1, in <module>
    import configparser
ImportError: No module named configparser   #这条报错是没有configparser模块
[root@node1 ~]# 
[root@node1 ~]# 
[root@node1 ~]# 
[root@node1 ~]# 
[root@node1 ~]# 
[root@node1 ~]# pip install configparser    #下载模块
Collecting configparser
  Downloading https://files.pythonhosted.org/packages/ba/05/6c96328e92e625fc31445d24d75a2c92ef9ba34fc5b037fe69693c362a0d/configparser-3.7.4-py2.py3-none-any.whl
Installing collected packages: configparser
Successfully installed configparser-3.7.4    #下载成功

rz上传slave节点

[root@node2 ~]# python3 2.py

[root@node2 ~]# python3 2.py    
master_ip:192.168.193.90
log_file:mysql-bin.000006
pos:530         
Redirecting to /bin/systemctl restart  mariadb.service

这样就完成了主从架构