安装glibc
glibc mysql 俗称绿色mysql
安装之前删掉mariadb:
[root@mysql3 ~]# ls -l /etc/my.cnf
-rw-r--r--. 1 root root 570 6月 8 2017 /etc/my.cnf
[root@mysql3 ~]# rm -rf /etc/my.cnf
[root@mysql3 ~]# yum -y remove mariadb
步骤：
1.解压
[root@mysql3 ~]# tar -xvf mysql-8.0.33-linux-glibc2.12-x86_64.tar
[root@mysql3 ~]# ls
mysql-8.0.33-linux-glibc2.12-x86_64.tar
mysql-8.0.33-linux-glibc2.12-x86_64.tar.xz
mysql-router-8.0.33-linux-glibc2.12-x86_64.tar.xz
mysql-test-8.0.33-linux-glibc2.12-x86_64.tar.xz
[root@mysql3 ~]# tar -xf mysql-8.0.33-linux-glibc2.12-x86_64.tar.xz
[root@mysql3 ~]# cd mysql-8.0.33-linux-glibc2.12-x86_64/
[root@mysql3 mysql-8.0.33-linux-glibc2.12-x86_64]# ls
bin docs include lib LICENSE man README share support-files
2.改名：
[root@mysql3 ~]# cp -r mysql-8.0.33-linux-glibc2.12-x86_64 /usr/local/mysql/
3.查看依赖库，没有的话安装
[root@mysql3 ~]# yum list installed | grep libaio
libaio.x86_64 0.3.109-13.el7 @anaconda
[root@mysql3 ~]# echo $?
0
4.创建用户
[root@mysql3 ~]# id mysql
id: mysql: no such user
[root@mysql3 ~]# useradd -r -s /sbin/nologin mysql
[root@mysql3 ~]# id mysql
uid=997(mysql) gid=995(mysql) 组=995(mysql)
5.创建一个mysql-files,修改mysql-files文件权限750和所属mysql
[root@mysql3 ~]# mkdir /usr/local/mysql/mysql-files
[root@mysql3 ~]# chown mysql:mysql /usr/local/mysql/mysql-files/
[root@mysql3 ~]# chmod 750 /usr/local/mysql/mysql-files/
6.初始化数据库，找到初始密码
[root@mysql3 ~]# /usr/local/mysql/bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql
7.查看是否初始化成功，可以看文件夹中是否有data文件夹
[root@mysql3 ~]# ls /usr/local/mysql/
bin docs lib man README support-files
data include LICENSE mysql-files share
8.设置ssl安全加密连接 敏感数据
[root@mysql3 ~]# /usr/local/mysql/bin/mysql_ssl_rsa_setup --datadir=/usr/local/mysql/data
9.其他配置
[root@mysql3 ~]# cp /usr/local/mysql/support-files/mysql.server /etc/init.d/mysql8
默认情况下，启动文件默认安装目录在/usr/local/目录下
10.启动服务，不能使用systemctl
[root@mysql3 ~]# service mysql8 start
编写脚本：自动化安装mysql
[root@mysql1 ~]# vim mysql.sh
1.远程登录的前提条件：mysql.user表中的host属性为%,如果是localhost就是不允许远程登录，update mysql.user set host="%" where user="root",flush privileges;
2.远程管理，可以使用图形化工具，sqlyog,navicat,命令工具就是客户端工具 mysql
3.mysql -h主机IP或域名 -P端口 -u用户名 -p密码
-h ：如果是localhost或者是127.0.0.1可省略
-P ：默认是3306，如果是默认的，可以省略
-p : 可以不换行直接输入，也可以换行，不回显输入密码
mysql的权限
用户
创建用户：
mysql> create user 'wangjia'@'%' identified by 'wangjia';
Query OK, 0 rows affected (0.02 sec)
mysql> select host,user from mysql.user;
+-----------+------------------+
| host | user |
+-----------+------------------+
| % | wangjia |
| localhost | mysql.infoschema |
| localhost | mysql.session |
| localhost | mysql.sys |
| localhost | root |
+-----------+------------------+
5 rows in set (0.00 sec)
给权限：
mysql> grant all on *.* to 'wangjia';
Query OK, 0 rows affected (0.00 sec)
all代表所有的权限，第一个*表示所有的库，第二个*表示所有的表
创建库：
create database if not exists test;
添加lilaosi账号，修改密码：
create user 'lilaosi'@'%' identified by 'lilaosi_123';
alter user 'lilaosi' identified by 'lilaosi';
使用root账号，为lilaosi账号添加test库中所有的表的所有权限：
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| performance_schema |
| test |
+--------------------+
3 rows in set (0.01 sec)
删除用户：
drop user 'wangjia';
将test库中user表的查看权限给abc:（在root账号下）
mysql> grant select on test.user to 'abc';
Query OK, 0 rows affected (0.01 sec)
在abc账号下：
mysql> insert into user values(7,'erha','erha');
ERROR 1142 (42000): INSERT command denied to user 'abc'@'localhost' for table 'user'
为abc添加insert权限：（在root权限下）
mysql> grant insert on test.user to 'abc';
Query OK, 0 rows affected (0.00 sec)
在abc账号下：
mysql> insert into test.user values(5,'wangmizi','wangmizi');
Query OK, 1 row affected (0.01 sec)
查看abc的权限：
mysql> show grants for 'abc';
+----------------------------------------------------+
| Grants for abc@% |
+----------------------------------------------------+
| GRANT USAGE ON *.* TO `abc`@`%` |
| GRANT SELECT, INSERT ON `test`.`user` TO `abc`@`%` |
+----------------------------------------------------+
2 rows in set (0.00 sec)
角色
一次一次添加权限不方便，因此引出了角色：
添加角色：jingli , yuangongjuese
mysql> create role 'jingli';
Query OK, 0 rows affected (0.00 sec)
mysql> create role 'yuangongjuese';
Query OK, 0 rows affected (0.01 sec)
给角色给权限：jingli (插入，更新，删除，选择)，yuangongjuese(插入，选择)
mysql> grant insert,update,delete,select on test.user to 'jingli';
Query OK, 0 rows affected (0.00 sec)
mysql> grant insert,select on test.user to 'yuangongjuese';
Query OK, 0 rows affected (0.00 sec)
查看角色保存的表格：
mysql> select host,user from mysql.user;
查看角色的权限：
mysql> show grants for 'jingli';
mysql> show grants for 'yuangongjuese';
创建用户bbb有插入，更新，删除，选择权限(增删改查），ccc有插入和选择权限：
创建用户，分别加入对应的角色里面即可：
mysql> create user 'bbb'@'%' identified by 'bbb';
Query OK, 0 rows affected (0.00 sec)
mysql> create user 'ccc'@'%' identified by 'ccc';
Query OK, 0 rows affected (0.00 sec)
mysql> grant jingli to 'bbb';
Query OK, 0 rows affected (0.00 sec)
mysql> show grants for bbb;
+---------------------------------+
| Grants for bbb@% |
+---------------------------------+
| GRANT USAGE ON *.* TO `bbb`@`%` |
| GRANT `jingli`@`%` TO `bbb`@`%` |
+---------------------------------+
2 rows in set (0.00 sec)
mysql> grant yuangongjuese to 'ccc';
Query OK, 0 rows affected (0.00 sec)
mysql> show grants for ccc;
+----------------------------------------+
| Grants for ccc@% |
+----------------------------------------+
| GRANT USAGE ON *.* TO `ccc`@`%` |
| GRANT `yuangongjuese`@`%` TO `ccc`@`%` |
+----------------------------------------+
2 rows in set (0.00 sec)
刷新权限：
mysql> flush privileges;
