3.1解压及制作软连接

tar xf mysql-5.7.20-linux-glibc2.12-x86_64.tar.gz

ln-s mysql-5.7.20-linux-glibc2.12-x86_64 mysql3.2编辑环境变量

在根目录'/'下的etc文件

vim/etc/profile

在文件最后一行,添加以下一行:

export PATH=/opt/mysql/bin:$PATH生效配置:

source/etc/profile3.3卸载centos自带mariadb

yum remove mariadb-libs3.4 生成配置文件(/etc/my.cnf)

vim/etc/my.cnf

---------------------------------

[mysqld]

basedir=/opt/mysql

datadir=/opt/mysql/data

socket=/tmp/mysql.sock

user=mysql

log_error=/var/log/mysql.log

log_bin=/opt/mysql/data/mysql-bin

server_id=100[mysql]

socket=/tmp/mysql.sock

----------------------------------3.5创建用户和数据目录,并授权

1.创建一个用户

useradd mysql

mkdir/opt/mysql/data

2.授权

chown-R mysql.mysql /opt/mysql3.6初始化数据

[root@python3 ~]#mysqld --initialize-insecure --basedir=/opt/mysql --datadir=/opt/mysql/data --user=mysql

2019-01-04T03:58:03.128958Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation formore details).2019-01-04T03:58:03.142436Z 0 [ERROR] Could not open file '/var/log/mysql.log' forerror logging: Permission denied2019-01-04T03:58:03.142492Z 0[ERROR] Aborting

报错解决:

touch/var/log/mysql.log

给权限:

chown-R mysql.mysql /var/log/mysql.log

再次初始化:

mysqld--initialize-insecure --basedir=/opt/mysql --datadir=/opt/mysql/data --user=mysql3.7启动mysql,切换到启动文件所在的文件夹

cd/opt/mysql/support-files

执行下面命令启动mysql

./mysql.server start

为了启动方便将启动文件拷贝到/etc下的配置文件

cp mysql.server/etc/init.d/mysqld

启动mysql用start,restart都可以/etc/init.d/mysqld restart

扩展:使用systemctl 管理mysql,写入下面文件就可以用systemctl来启动mysql

vim/etc/systemd/system/mysqld.service

-----------------------------------------------------------------

[Unit]

Description=MySQL Server

Documentation=man:mysqld(8)

Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html

After=network.target

After=syslog.target

[Install]

WantedBy=multi-user.target

[Service]

User=mysql

Group=mysql

ExecStart=/opt/mysql/bin/mysqld --defaults-file=/etc/my.cnf

LimitNOFILE= 5000-------------------------------------------------------------------------------

启动mysql

systemctl restart mysqld

关闭mysql

systemctl stop mysql

查看mysql的端口

netstat-tulnp |grep 3306

查看mysql软件是否启动

netstat -lnp | grep mysql

如果修改配置文件需要:

systemctl daemon-reload

3.8测试python3链接mysql

创建mysql链接用户

授权用户

grant all on*.* to root@'10.0.0.%' identified by '123';

create database bbs charset utf8;

python代码测试:

更新pip

pip3 install--upgrade pip

安装python连接包

pip3 install pymysql

测试脚本

vim testmysql.py

----------------------------------------------------------#!/usr/bin/python3import pymysql

db= pymysql.connect("10.0.0.100","root","123","bbs")

cursor.execute("SELECT VERSION()")

data=cursor.fetchone()

print ("Database version : %s" %data)

db.close()

----------------------------------------------------------

python3 testmysql.py