8.16 mysql主从数据库（5.7版本）与python的交互及mycat

mysql数据库基本操作：

$root@m \~$ # tar -xf mysql-5.7.44-linux-glibc2.12-x86_64.tar.gz 解压压缩包

$root@m \~$ # ls

anaconda-ks.cfg

mysql-5.7.44-linux-glibc2.12-x86_64

mysql-5.7.44-linux-glibc2.12-x86_64.tar.gz

$root@m \~$ # cp -r mysql-5.7.44-linux-glibc2.12-x86_64 /usr/local/mysql

$root@m \~$ # rm -rf /etc/my.cnf

$root@m \~$ # mkdir /usr/local/mysql/mysql-files

$root@m \~$ # useradd -r -s /sbin/nologin mysql

$root@m \~$ # chown mysql:mysql /usr/local/mysql/mysql-files/

$root@m \~$ # chmod 750 /usr/local/mysql/mysql-files/ 授予权限

$root@m \~$ # /usr/local/mysql/bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql/ 进行初始化

2024-08-15T02:37:51.714490Z 0 $Warning$ TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).

2024-08-15T02:37:51.883374Z 0 $Warning$ InnoDB: New log files created, LSN=45790

2024-08-15T02:37:51.927026Z 0 $Warning$ InnoDB: Creating foreign key constraint system tables.

2024-08-15T02:37:51.985501Z 0 $Warning$ No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: 5e50091b-5aaf-11ef-903e-000c2962cb99.

2024-08-15T02:37:51.986327Z 0 $Warning$ Gtid table is not ready to be used. Table 'mysql.gtid_executed' cannot be opened.

2024-08-15T02:37:53.342567Z 0 $Warning$ A deprecated TLS version TLSv1 is enabled. Please use TLSv1.2 or higher.

2024-08-15T02:37:53.342586Z 0 $Warning$ A deprecated TLS version TLSv1.1 is enabled. Please use TLSv1.2 or higher.

2024-08-15T02:37:53.344783Z 0 $Warning$ CA certificate ca.pem is self signed.

2024-08-15T02:37:53.842790Z 1 $Note$ A temporary password is generated for root@localhost: UW2j.oFipqq= 获得原始密码

$root@m \~$ # ls

anaconda-ks.cfg

mysql-5.7.44-linux-glibc2.12-x86_64

mysql-5.7.44-linux-glibc2.12-x86_64.tar.gz

$root@m \~$ # ls /usr/local/mysql/

bin docs lib man README support-files

data include LICENSE mysql-files share

$root@m \~$ # cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql57

$root@m \~$ # service mysql57 start 启动mysql

Starting MySQL.Logging to '/usr/local/mysql/data/m.sql.err'.

SUCCESS!

修改配置文件

$root@m \~$ # vim /usr/local/mysql/my.cnf 主服务器的配置文件

mysqld

basedir=/usr/local/mysql

datadir=/usr/local/mysql/data

socket=/tmp/mysql.sock

port=3306

log-error=/usr/local/mysql/data/db01-master.err

log-bin=/usr/local/mysql/data/binlog

server-id=10

character_set_server=utf8mb4

$root@m \~$ # /usr/local/mysql/bin/mysql -p 开启mysql

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.7.44

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> alter user 'root'@'localhost' identified by 'root'; 修改数据库账号

Query OK, 0 rows affected (0.00 sec)

mysql> create user 'chz'@'%' identified by 'chz'; 创建可以连接外部的账号

Query OK, 0 rows affected (0.00 sec)

mysql> grant all on *.* to 'chz'@'%'; 授予权限

Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql>

mysql> create database if not exists test charset utf8mb4

-> ;

Query OK, 1 row affected (0.00 sec)

mysql> use test

Database changed

mysql> create table user(id int primary key auto_increment,username varchar(45) not null,password varchar(45) not null);

Query OK, 0 rows affected (0.00 sec)

mysql> insert into user (username,password)values("aaa","aaa");

Query OK, 1 row affected (0.01 sec)

mysql> select * from user

-> ;

+----+----------+----------+

| id | username | password |

+----+----------+----------+

| 1 | aaa | aaa |

+----+----------+----------+

1 row in set (0.00 sec)

mysql>

mysql> select host ,user from mysql.user;

+-----------+---------------+

| host | user |

+-----------+---------------+

| % | chz |

| % | slave0 |

| localhost | mysql.session |

| localhost | mysql.sys |

| localhost | root |

+-----------+---------------+

5 rows in set (0.00 sec)

mysql> update mysql.user set host='%' where user='root';

Query OK, 1 row affected (0.01 sec)

Rows matched: 1 Changed: 1 Warnings: 0

mysql> flush privileges;

交互

在python（写成脚本执行）

import pymysql

conn=pymysql.connect(host="192.168.2.50",port=3306,database="test",user="root",password="root");

cursor=conn.cursor()

cursor.execute("create user 'slave2'@'%' identified by 'slave2'")

cursor.execute("grant replication slave on *.* to 'slave2'@'%'")

cursor.execute("flush privileges")

cursor.execute("flush tables with read lock")

cursor.execute("show master status")

print(cursor.fetchall())

isOk=input("slave server ok? y/n")

if isOK=='y':

cursor.execute("unlock tables")

cursor.execute("flush tables with read lock") 锁表

cursor.execute("unlock tables") 取消锁表

mycat

$root@mycat \~$ # ls

anaconda-ks.cfg jre-8u191-linux-x64.tar.gz

jdk-8u192-linux-x64.tar.gz Mycat-server-1.6.5-release-20180122220033-linux.tar.gz

$root@mycat \~$ # tar -xf jdk-8u192-linux-x64.tar.gz

$root@mycat \~$ # tar -xf Mycat-server-1.6.5-release-20180122220033-linux.tar.gz

$root@mycat \~$ # ls

anaconda-ks.cfg jre-8u191-linux-x64.tar.gz

jdk1.8.0_192 mycat

jdk-8u192-linux-x64.tar.gz Mycat-server-1.6.5-release-20180122220033-linux.tar.gz

$root@mycat \~$ # cp -r jdk1.8.0_192/ /usr/local/jdk

$root@mycat \~$ # cp -r mycat/ /usr/local/

查看并且配置jdk文件

$root@mycat \~$ # sed -i '$aexport JAVA_HOME=/usr/local/jdk' /etc/profile

$root@mycat \~$ # source /etc/profile

$root@mycat \~$ # $JAVA_HOME

-bash: /usr/local/jdk: 是一个目录

$root@mycat \~$ # sed -i ' $aexport PATH=$ PATH:$JAVA_HOME/bin' /etc/profile

$root@mycat \~$ # source /etc/profile

$root@mycat \~$ # $PATH

-bash: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local/jdk/BIN:/usr/local/jdk/bin: 没有那个文件或目录

$root@mycat \~$ # java -version

java version "1.8.0_192"

Java(TM) SE Runtime Environment (build 1.8.0_192-b12)

Java HotSpot(TM) 64-Bit Server VM (build 25.192-b12, mixed mode)

$root@mycat \~$ # javac -version

javac 1.8.0_192

$root@mycat \~$ # /usr/local/mycat/bin/mycat console 启动mycat

Running Mycat-server...

wrapper | --> Wrapper Started as Console

wrapper | Launching a JVM...

jvm 1 | Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=64M; support was removed in 8.0

jvm 1 | Wrapper (Version 3.2.3) http://wrapper.tanukisoftware.org

jvm 1 |

jvm 1 | log4j:WARN No appenders could be found for logger (io.mycat.memory.MyCatMemory).

jvm 1 | log4j:WARN Please initialize the log4j system properly.

jvm 1 | log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

jvm 1 | MyCAT Server startup successfully. see logs in logs/mycat.log 启动成功

$root@mycat \~$ # vim /usr/local/mycat/conf/server.xml

数据库的账号，数据库的密码，数据库

注释掉

$root@mycat \~$ # vim /usr/local/mycat/conf/schema.xml

删除前面的，然后修改

$root@mycat \~$ # /usr/local/mycat/bin/mycat start

Starting Mycat-server...

$root@mycat \~$ # netstat -lnput | grep 8066

测试连接

$root@client \~$ # cd mysql-8.0.33-linuxglibc2.12-x86_64/

$root@client mysql-8.0.33-linuxglibc2.12-x86_64$ # cd bin/

$root@client bin$ # ./mysql -h10.1.1.60 - P8066 -uchz -pchz