#卸载系统自带的Mariadb

[root@hdp265dnsnfs ~]# rpm -qa|grep mariadb

mariadb-libs-5.5.-.el7.centos.x86_64

[root@hdp265dnsnfs ~]# rpm -e --nodeps mariadb-libs-5.5.-.el7.centos.x86_64

#删除etc目录下的my.cnf文件

[root@hdp265dnsnfs ~]# rm /etc/my.cnf

rm: cannot remove ?etc/my.cnf? No such file or directory

#检查mysql是否存在

[root@hdp265dnsnfs ~]# rpm -qa | grep mysql

[root@hdp265dnsnfs ~]# 

#检查mysql组和用户是否存在，如无创建

[root@hdp265dnsnfs ~]# cat /etc/group | grep mysql

[root@hdp265dnsnfs ~]#  cat /etc/passwd | grep mysql

#创建mysql用户组

[root@hdp265dnsnfs ~]# groupadd mysql

#创建一个用户名为mysql的用户并加入mysql用户组

[root@hdp265dnsnfs ~]# useradd -g mysql mysql

#制定password 为111111

[root@hdp265dnsnfs ~]# passwd mysql

Changing password for user mysql.

New password:

BAD PASSWORD: The password is a palindrome

Retype new password:

passwd: all authentication tokens updated successfully.

#由于我的/usr/local空间不足，所以我安装到/var

[root@hdp265dnsnfs var]# tar -zxvf mysql-5.7.-linux-glibc2.-x86_64.tar.gz

[root@hdp265dnsnfs var]# mv mysql-5.7.-linux-glibc2.-x86_64/ mysql57

#更改所属的组和用户

[root@hdp265dnsnfs var]# chown -R mysql mysql57/

[root@hdp265dnsnfs var]# chgrp -R mysql mysql57/
[root@hdp265dnsnfs var]# cd mysql57/

[root@hdp265dnsnfs mysql57]# mkdir data

[root@hdp265dnsnfs mysql57]# chown -R mysql:mysql data

[mysql]
# 设置mysql客户端默认字符集
default-character-set=utf8
[mysqld]
skip-name-resolve
#设置3306端口
port = 3306
# 设置mysql的安装目录
basedir=/var/mysql57
# 设置mysql数据库的数据的存放目录
datadir=/var/mysql57/data
# 允许最大连接数
max_connections=200
# 服务端使用的字符集默认为8比特编码的latin1字符集
character-set-server=utf8
# 创建新表时将使用的默认存储引擎
default-storage-engine=INNODB
lower_case_table_names=1
max_allowed_packet=16M

[root@hdp265dnsnfs mysql57]# bin/mysql_install_db --user=mysql --basedir=/var/mysql57/ --datadir=/var/mysql57/data/

-- :: [WARNING] mysql_install_db is deprecated. Please consider switching to mysqld --initialize

-- :: [WARNING] The bootstrap log isn't empty:

-- :: [WARNING] --17T09::.728710Z  [Warning] --bootstrap is deprecated. Please consider using --initialize instead

--17T09::.729161Z  [Warning] Changed limits: max_open_files:  (requested )

--17T09::.729167Z  [Warning] Changed limits: table_open_cache:  (requested )

[root@hdp265dnsnfs mysql57]# cp ./support-files/mysql.server /etc/init.d/mysqld

[root@hdp265dnsnfs mysql57]# chown  /etc/my.cnf

[root@hdp265dnsnfs mysql57]# chmod +x /etc/init.d/mysqld

[root@hdp265dnsnfs mysql57]# /etc/init.d/mysqld restart

Shutting down MySQL.. SUCCESS!

Starting MySQL. SUCCESS! 

#设置开机启动

[root@hdp265dnsnfs mysql57]# chkconfig --level  mysqld on

[root@hdp265dnsnfs mysql57]# chkconfig --list mysqld

[root@hdp265dnsnfs mysql57]# chmod +x /etc/rc.d/init.d/mysqld

[root@hdp265dnsnfs mysql57]# chkconfig --add mysqld

[root@hdp265dnsnfs mysql57]# chkconfig --list mysqld

[root@hdp265dnsnfs mysql57]# service mysqld status

 SUCCESS! MySQL running ()

export PATH=$PATH:/var/mysql57/bin

[root@hdp265dnsnfs mysql57]# source /etc/profile

[root@hdp265dnsnfs bin]# cat /root/.mysql_secret

# Password set for user 'root@localhost' at -- ::

_pB*3VZl5T<

[root@hdp265dnsnfs bin]# mysql -uroot -p

Enter password:

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

Your MySQL connection id is

Server version: 5.7.

Copyright (c) , , Oracle and/or its affiliates. All rights reserved.

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> set PASSWORD = PASSWORD('');

Query OK,  rows affected,  warning (0.00 sec)

mysql> flush privileges;

Query OK,  rows affected (0.01 sec)

mysql> use mysql

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

Query OK,  row affected (0.00 sec)

Rows matched:   Changed:   Warnings: 

mysql> select host,user from user;

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

| host      | user      |

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

| %         | root      |

| localhost | mysql.sys |

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

 rows in set (0.00 sec)

create user 'xxx'@'%' identified by '123';  这里 @‘%’ 表示在任何主机都可以登录

/bin/systemctl restart  mysql.service

[root@hdp265dnsnfs bin]# /etc/init.d/mysqld restart

Shutting down MySQL.. SUCCESS!

Starting MySQL. SUCCESS! 

ln -s /var/mysql57/bin/mysql   /usr/bin/mysql