1.检测本地是否安装mysql已存在的包

rpm -qa | grep mysql

2.检测本地是否有mariadb已存在的包

rpm -qa | grep mariadb

存在：

[root@bigData111 module]## rpm -qa | grep mariadb
mariadb-libs-5.5.56-2.el7.x86_64

如果存在则删除：

yum -y remove mariadb-libs-5.5.56-2.el7.x86_64

3.创建一个文件夹，上传jar包到/opt/software/mysql

mkdir /opt/software/mysql

4.解压mysql jar包

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

5.安装mysql的 server、client、common、libs、lib-compat

依次使用如下命令：

rpm -ivh --nodeps mysql-community-server-5.7.19-1.el7.x86_64.rpm
rpm -ivh --nodeps mysql-community-client-5.7.19-1.el7.x86_64.rpm
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-libs-compat-5.7.19-1.el7.x86_64.rpm

6.查看mysql的服务是否启动

systemctl status mysqld

如下则为未启动状态 Active: inactive (dead)

[root@bigData111 software]## systemctl status mysqld
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: inactive (dead)
  Docs: man:mysqld(8)
  http://dev.mysql.com/doc/refman/en/using-systemd.html

启动mysql服务：

systemctl start mysqld

再次检查mysql的服务是否启动

systemctl status mysqld

如下则为已启动状态：Active: active (running) since Sun 2019-09-29 15:53:20 CST; 4s ago

[root@bigData111 software]## systemctl status mysqld
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: active (running) since Sun 2019-09-29 15:53:20 CST; 4s ago
  Docs: man:mysqld(8)
  http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 1898 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
  Process: 1825 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 1901 (mysqld)
CGroup: /system.slice/mysqld.service
  └─1901 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid
Sep 29 15:53:13 bigData111 systemd[1]: Starting MySQL Server...
Sep 29 15:53:20 bigData111 systemd[1]: Started MySQL Server.

7.查看默认生成的密码

cat /var/log/mysqld.log | grep password

如下：

[root@bigData111 software]## cat /var/log/mysqld.log | grep password
2019-09-29T07:53:15.860473Z 1 [Note] A temporary password is generated for root@localhost: 3g:ieXDlZFjg

8.登录mysql服务

mysql -uroot -p然后粘贴上密码

注意：-p后面直接加密码，不要有空格

9.修改mysql密码规则

目的：更改mysql登录密码

注意事项：以下修改为临时修改，但是利用更改后规则设置的密码是永久的。

1. 密码强度检查等级，0/LOW、1/MEDIUM、2/STRONG

mysql>  set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)

2. 密码至少要包含的小写字母个数和大写字母个数

mysql> set global validate_password_mixed_case_count=0;
Query OK, 0 rows affected (0.00 sec)

3. 密码至少要包含的数字个数

mysql> set global validate_password_number_count=3;
Query OK, 0 rows affected (0.00 sec)

4. 密码至少要包含的特殊字符数

mysql> set global validate_password_special_char_count=0;
Query OK, 0 rows affected (0.00 sec)

5. 密码最小长度，参数默认为8，

mysql> set global validate_password_length=3;
Query OK, 0 rows affected (0.00 sec)

6. 验证是否临时修改成功

mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+-------+
| Variable_name| Value |
+--------------------------------------+-------+
| validate_password_check_user_name | OFF|
| validate_password_dictionary_file | |
| validate_password_length | 3  |
| validate_password_mixed_case_count| 0  |
| validate_password_number_count | 3  |
| validate_password_policy | LOW|
| validate_password_special_char_count | 0  |
+--------------------------------------+-------+
7 rows in set (0.00 sec)

10.修改mysql登录密码为000000

mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('000000');
Query OK, 0 rows affected, 1 warning (0.00 sec)

11.修改远程登录权限

1. 查询当前user表内root的登录权限：

select host,user from mysql.user;

mysql> select host,user from user;
+-----------+---------------+
| host| user |
+-----------+---------------+
| localhost | mysql.session |
| localhost | mysql.sys  |
| localhost | root |
+-----------+---------------+
3 rows in set (0.00 sec)

2. 修改权限为所有%：

update mysql.user set host = '%' where user = 'root';

mysql> update mysql.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.session |
| localhost | mysql.sys  |
+-----------+---------------+
3 rows in set (0.00 sec)

3. 刷新缓存：

flush privileges;

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)