Linux下MySQL的数据库安装

#卸载系统自带的Mariadb
[[email?protected] ~]# rpm -qa|grep mariadb
mariadb-libs-5.5.44-2.el7.centos.x86_64
[[email?protected] ~]# rpm -e --nodeps mariadb-libs-5.5.44-2.el7.centos.x86_64

#删除etc目录下的my.cnf文件

[[email?protected] ~]# rm /etc/my.cnf
rm: cannot remove ?etc/my.cnf? No such file or directory

#检查mysql是否存在
[[email?protected] ~]# rpm -qa | grep mysql
[[email?protected] ~]# 

#检查mysql组和用户是否存在，如无创建
[[email?protected] ~]# cat /etc/group | grep mysql 
[[email?protected] ~]#  cat /etc/passwd | grep mysql

#创建mysql用户组
[[email?protected] ~]# groupadd mysql
#创建一个用户名为mysql的用户并加入mysql用户组
[[email?protected] ~]# useradd -g mysql mysql
#制定password 为222221
[[email?protected] ~]# 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
[[email?protected] var]# tar -zxvf mysql-5.7.18-linux-glibc2.5-x86_64.tar.gz 
[[email?protected] var]# mv mysql-5.7.18-linux-glibc2.5-x86_64/ mysql57

#更改所属的组和用户
[[email?protected] var]# chown -R mysql mysql57/
[[email?protected]5dnsnfs var]# chgrp -R mysql mysql57/
[[email?protected] var]# cd mysql57/

[[email?protected] mysql57]# mkdir data

[[email?protected] 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

[[email?protected] mysql57]# bin/mysql_install_db --user=mysql --basedir=/var/mysql57/ --datadir=/var/mysql57/data/
2017-04-17 17:40:02 [WARNING] mysql_install_db is deprecated. Please consider switching to mysqld --initialize
2017-04-17 17:40:05 [WARNING] The bootstrap log isn‘t empty:
2017-04-17 17:40:05 [WARNING] 2017-04-17T09:40:02.728710Z 0 [Warning] --bootstrap is deprecated. Please consider using --initialize instead
2017-04-17T09:40:02.729161Z 0 [Warning] Changed limits: max_open_files: 1024 (requested 5000)
2017-04-17T09:40:02.729167Z 0 [Warning] Changed limits: table_open_cache: 407 (requested 2000)

[[email?protected] mysql57]# cp ./support-files/mysql.server /etc/init.d/mysqld
[[email?protected] mysql57]# chown 777 /etc/my.cnf 
[[email?protected] mysql57]# chmod +x /etc/init.d/mysqld

[[email?protected] mysql57]# /etc/init.d/mysqld restart
Shutting down MySQL.. SUCCESS! 
Starting MySQL. SUCCESS! 

#设置开机启动

[[email?protected] mysql57]# chkconfig --level 35 mysqld on
[[email?protected] mysql57]# chkconfig --list mysqld

[[email?protected] mysql57]# chmod +x /etc/rc.d/init.d/mysqld
[[email?protected] mysql57]# chkconfig --add mysqld
[[email?protected] mysql57]# chkconfig --list mysqld
[[email?protected] mysql57]# service mysqld status
 SUCCESS! MySQL running (4475)

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

[[email?protected] mysql57]# source /etc/profile

[[email?protected] bin]# cat /root/.mysql_secret  
# Password set for user ‘[email?protected]‘ at 2017-04-17 17:40:02 
_pB*3VZl5T<6

[[email?protected] bin]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 5
Server version: 5.7.18

Copyright (c) 2000,2017,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(‘222221‘);
Query OK,0 rows affected,1 warning (0.00 sec)

mysql> flush privileges;
Query OK,0 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,1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select host,user from user;
+-----------+-----------+
| host      | user      |
+-----------+-----------+
| %         | root      |
| localhost | mysql.sys |
+-----------+-----------+
2 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

[[email?protected] bin]# /etc/init.d/mysqld restart 
Shutting down MySQL.. SUCCESS! 
Starting MySQL. SUCCESS! 

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