mysql数据库安装

mysql下载地址

https://downloads.mysql.com/archives/community/

安装环境信息

mysql版本 ：5.7.19版本
安装包：mysql-5.7.19-1.el7.x86_64.rpm-bundle.tar

linux版本（cat /proc/version） ：Linux version 3.10.0-1062.18.1.el7.x86_64 (mockbuild@kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC) ) #1 SMP Tue Mar 17 23:49:17 UTC 2020

开始安装

查找以前是否安装有mysql，使用下面命令，安装则删除

查询命令

rpm -qa|grep mariadb

rpm -qa|grep -i mysql

删除命令

rpm -e --nodeps xxxx

例如：rpm -e --nodeps mysql-community-common-5.7.19-1.el7.x86_64.rpm

解压压缩包并安装

tar -xvf mysql-5.7.19-1.el7.x86_64.rpm-bundle.tar 解压

rpm -ivh mysql-community-common-5.7.19-1.el7.x86_64.rpm

rpm -ivh mysql-community-libs-5.7.19-1.el7.x86_64.rpm

rpm -ivh mysql-community-client-5.7.19-1.el7.x86_64.rpm

rpm -ivh mysql-community-server-5.7.19-1.el7.x86_64.rpm

安装rpm包过程中报依赖包错误则需要安装依赖包再继续安装
yum install libaio

安装完毕实例目录创建

mkdir -p /data/mysqldata3307

cd /data/mysqldata3307

mkdir binlog innodb_log innodb_ts log mydata relaylog sock tmpdir

chown -R mysql:mysql /data/mysqldata3307

配置文件my.cnf(可参考my.cnf配置文件)https://www.cnblogs.com/whiteY/p/13287951.html

/etc/my.cnf

实例初始化及启动

systemctl start mysqld@3307

如果报以下错误请参考https://www.cnblogs.com/whiteY/p/13286214.html

Starting mysqld (via systemctl): Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld3306.service" and "journalctl -xe" for details.

连接mysql并修改密码

第一次登录只能用socket登录

启动时，I7会在error.log中打印初始化该实例时的密码

[root@cdh02 log]# grep 'temporary password' ./error.log

2020-07-12T03:07:15.306108Z 1 [Note] A temporary password is generated for root@localhost: J_qF6Oi5xr?i

mysql -uroot -S /data1/mysqldata3307/sock/mysql.sock -p"J_qF6Oi5xr?i"

修改密码强度为最弱，默认最强
set global validate_password_policy=0;

修改密码长度最少的为8位

set global validate_password_length=8;

修改密码
set password='abc123456';

赋予权限
GRANT ALL PRIVILEGES ON *.* TO 'root'@'127.0.0.1' identified by 'abc123456' WITH GRANT OPTION ;

刷新改动
flush privileges;

新密码连接
mysql -uroot -pabc123456 -P3307 -h127.0.0.1