实训day29(8.15) - 技术栈

一、python管理mysql

1、搭建主mysql

$root@mysql57 \~$ # tar -xf mysql-5.7.44-linux-glibc2.12-x86_64.tar.gz

$root@mysql57 \~$ # cp -r mysql-5.7.44-linux-glibc2.12-x86_64 /usr/local/mysql

$root@mysql57 \~$ # rm -rf /etc/my.cnf

$root@mysql57 \~$ # mkdir /usr/local/mysql/mysql-files

$root@mysql57 \~$ # useradd -r -s /sbin/nologin mysql

$root@mysql57 \~$ # chown mysql:mysql /usr/local/mysql/mysql-files/

$root@mysql57 \~$ # chown 750 /usr/local/mysql/mysql-files/

$root@mysql57 \~$ # /usr/local/mysql/bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql

$root@mysql57 \~$ # ls /usr/local/mysql/

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

/etc/init.d/mysql57

$root@mysql57 \~$ # service mysql57 start

$root@mysql57 \~$ # /usr/local/mysql/bin/mysql -p

Enter password:

mysql> alter user 'root'@'localhost' identified by 'root';

Query OK, 0 rows affected (0.00 sec)

mysql> create user 'blt'@'%' identified by 'blt';

Query OK, 0 rows affected (0.00 sec)

mysql> grant all on *.* to 'blt'@'%';

Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

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 (0.01 sec)

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

Query OK, 1 row affected (0.02 sec)

mysql> select * from user;

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

| id | username | password |

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

| 1 | aaa | aaa |

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

1 row in set (0.00 sec)

2、pymysql

$root@client \~$ # python3

>>> import pymysql

>>>conn=pymysql.connect(host="192.168.8.150",port=3306,database="test",user="blt",password="blt");

>>> cursor=conn.cursor()

3、修改root权限

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

Query OK, 1 row affected (0.00 sec)

Rows matched: 1 Changed: 1 Warnings: 0

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

>>>conn=pymysql.connect(host="192.168.8.150",port=3306,database="test",user="root",password="root");

>>> curson=conn.cursor()

>>> cursor.execute("create user 'slave0'@'%' identified by 'slave0'")

>>> cursor.execute("grant replication slave on *.* to 'slave0'@'%'")

>>> cursor.execute("flush privileges")

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

>>> cursor.execute("unlock tables")

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

>>> cursor.execute("show master status")

>>> print(cursor.fetchall())

()

>>> cursor.execute("show master status")

4、my.cnf

$root@mysql57 \~$ # rm -rf /etc/my.cnf

$root@mysql57 \~$ # vim /usr/local/mysql/my.cnf

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

$root@mysql57 \~$ # service mysql57 restart

>>> conn=pymysql.connect(host="192.168.8.150",port=3306,database="test",user="blt",password="blt");

>>> cursor=conn.cursor()

>>> cursor.execute("show master status")

>>> print(cursor.fetchall())

(('binlog.000001', 154, '', '', ''),)

>>> cursor.execute("unlock tables")

5、slave数据库

$root@slave57 \~$ # tar -xf mysql-5.7.44-linux-glibc2.12-x86_64.tar.gz

$root@slave57 \~$ # cp -r mysql-5.7.44-linux-glibc2.12-x86_64 /usr/local/mysql

$root@slave57 \~$ # ls /usr/local/mysql/

$root@slave57 \~$ # mkdir /usr/local/mysql/mysql-files

$root@slave57 \~$ # useradd -r -s /sbin/nologin mysql

$root@slave57 \~$ # chown mysql:mysql /usr/local/mysql/mysql-files/

$root@slave57 \~$ # chmod 750 /usr/local/mysql/mysql-files/

6、主从同步

$root@mysql57 \~$ # rm -rf /usr/local/mysql/data/auto.cnf

$root@mysql57 \~$ # yum -y install rsync

$root@mysql57 \~$ # rsync -av /usr/local/mysql/data root@192.168.8.151:/usr/local/mysql/

$root@slave57 \~$ # yum -y install rsync

$root@slave57 \~$ # vim /usr/local/mysql/my.cnf

$root@slave57 \~$ # cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql57

$root@slave57 \~$ # sed -i ' $aexport PATH=$ PATH:/usr/local/mysql/bin' /etc/profile

$root@slave57 \~$ # sed -n '$p' /etc/profile

export PATH=$PATH:/usr/local/mysql/bin

$root@slave57 \~$ # source /etc/profile

$root@slave57 \~$ # chkconfig --add mysql57

$root@slave57 \~$ # chkconfig mysql57

$root@slave57 \~$ # chkconfig mysql57 on

7、错误

$root@slave57 \~$ # service mysql57 start

Starting MySQL.2024-08-15T06:29:37.027747Z mysqld_safe error: log-error set to '/var/log/mariadb/mariadb.log', however file don't exists. Create writable for user 'mysql'.

ERROR! The server quit without updating PID file (/usr/local/mysql/data/slave57.pid).

$root@slave57 \~$ # mkdir /var/log/mariadb

$root@slave57 \~$ # touch /var/log/mariadb/mariadb.log

$root@slave57 \~$ # chown -R mysql:mysql /var/log/mariadb/

$root@slave57 \~$ # service mysql57 start

Starting MySQL. SUCCESS!

二、MyCat实现读写分离

1、添加新的虚拟主机，关闭防火墙

$root@mycat \~$ # systemctl stop firewalld

$root@mycat \~$ # setenforce 0

2、上传jdk和Mycat

$root@mycat \~$ # ls

3、解压并上传到指定位置

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

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

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

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

4、查看并且配置jdk文件

$root@mycat \~$ # ls /usr/local/jdk/

$root@mycat \~$ # 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:/usr/local/jdk/bin: 没有那个文件或目录

$root@mycat \~$ # javac -version

javac 1.8.0_192

5、测试启动Mycat

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

6、配置读写分离

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

93 <user name="blt" defaultAccount="true">

94 <property name="password">blt</property>

95 <property name="schemas">test</property>

107 <!--

108 <user name="user">

109 <property name="password">user</property>

110 <property name="schemas">TESTDB</property>

111 <property name="readOnly">true</property>

112 </user>

113 -->

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

4

5 <schema name="test" dataNode="dn1" checkSQLschema="false" sqlMaxLimit="100">

6 </schema>

7 <!-- <dataNode name="dn1 $0-743" dataHost="localhost1" database="db$ 0-743"

8 /> -->

9 <dataNode name="dn1" dataHost="localhost1" database="test" />

20 <writeHost host="hostM1" url="192.168.8.150:3306" user="blt" password="blt">

21

22 <readHost host="hostS2" url="192.168.8. 151:3310" user="blt" password="blt" />

23 </writeHost>

7、测试

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

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

$root@client \~$ # cd mysql-5.7.44-linux-glibc2.12-x86_64/

$root@client mysql-5.7.44-linux-glibc2.12-x86_64$ # cd bin/

$root@client bin$ # ./mysql -h192.168.8.152 -P8066 -ublt -pblt

mysql> show databases;

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

| Database |

+--------------------+ |

| test |

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

1 rows in set (0.00 sec)

mysql> use test;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> select * from user;

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

| id | username | password |

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

| 1 | aaa | aaa |

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

1 row in set (0.00 sec)

mysql> show variables like "server_id";

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

| Variable_name | Value |

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

| server_id | 10 |

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

1 row in set (0.02 sec)