1、下载mysql ，同样，跳过，----需要跟linux版本相对应
2、查看虚拟机内是否有mysql
rpm -qa|grep mysql
如果有，则需要删除mysql相关文件
* rpm -ev xxx --nodeps
3.使用本地文件在线安装数据库:
* 把mysql-community-release-el6-5.noarch.rpm传到linux根目录下
* 在根目录下执行在线安装指令
yum
localinstall mysql-community-release-el6-5.noarch.rpm
4.在线安装mysql服务
* yum
install mysql-server
注意:
1.安装中断继续重新执行指令
2.报错yum指令正在被其他应用占用:
* ps -ef | grep yum 查看正在使用yum的进程...>进程号
* 根据进程号杀死 kill -9 进程号
5.启动数据库服务:
* service mysqld start
* service mysqld status 查看数据库状态
设置开机启动
systemctl enable mysqld
systemctl daemon-reload
6. 设置mysql用户名密码:
从日志中获取初始密码：
从日志中获取随机生成的密码 [root@node1 db]# grep password /var/log/mysqld.log 2018-07-15T09:01:09.735836Z 1 [Note] A temporary password is generated for root@localhost: ViFg8pWf+,lU [root@node1 db]# mysql -uroot -pViFg8pWf+,lU mysql: [Warning] Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or g. Your MySQL connection id is 2
ALTER USER USER() IDENTIFIED BY '123456';
如果密码不符合规则，则需要修改策略
第一种、alert
mysql> ALTER USER USER() IDENTIFIED BY 'Reid790!@#$'; Query OK, 0 rows affected (0.00 sec) mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Tom579#$%^&'; #针对localhost Query OK, 0 rows affected (0.00 sec) 或者先关闭其密码策略修改 mysql> select @@validate_password_length; ERROR 1820 (HY000): Unknown error 1820 mysql> ALTER USER USER() IDENTIFIED BY '12345678'; Query OK, 0 rows affected (0.00 sec) validate_password_policy有以下取值： Policy Tests Performed 0 or LOW Length 1 or MEDIUM Length; numeric, lowercase/uppercase, and special characters 2 or STRONG Length; numeric, lowercase/uppercase, and special characters; dictionary file 默认是1，即MEDIUM，所以刚开始设置的密码必须符合长度，且必须含有数字，小写或大写字母，特殊字符。
第二种：跳过授权列表skip-grant-tables
[root@node1 db]# mysql
ERROR 1045 (28000): Unknown error 1045
[root@node1 db]# vim /etc/my.cnf #使用完后去掉
[mysqld]
skip-grant-tables=1
重启mysql,再修改
[root@node1 db]# systemctl restart mysqld
[root@node1 db]# mysql
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.7.22 MySQL Community Server (GPL)
Copyright (c) 2000, 2018, 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('Reid4909@%&');
ERROR 1290 (HY000): Unknown error 1290
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Tom579#$%^&';
ERROR 1290 (HY000): Unknown error 1290
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> set password = PASSWORD('Reid4909@%&');
ERROR 1133 (42000):
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Tom579#$%^&';
Query OK, 0 rows affected (0.01 sec)
mysql> set password for root@localhost = password('123456');
Query OK, 0 rows affected, 1 warning (0.00 sec)
第三种：使用mysql_secure_installation
[root@node1 db]# mysql_secure_installation Securing the MySQL server deployment. Enter password for user root: Marry583@&%! The 'validate_password' plugin is installed on the server. The subsequent steps will run with the existing configuration of the plugin. Using existing password for root. Estimated strength of the password: 100 Change the password for root ? ((Press y|Y for Yes, any other key for No) : y New password: Tom579#$%^& Re-enter new password: Tom579#$%^& Estimated strength of the password: 100 Do you wish to continue with the password provided?(Press y|Y for Yes, any other key for No) : y By default, a MySQL installation has an anonymous user, allowing anyone to log into MySQL without having to have a user account created for them. This is intended only for testing, and to make the installation go a bit smoother. You should remove them before moving into a production environment. 为了安全应该yes Remove anonymous users? (Press y|Y for Yes, any other key for No) : No ... skipping. Normally, root should only be allowed to connect from 'localhost'. This ensures that someone cannot guess at the root password from the network. 为了安全应该yes Disallow root login remotely? (Press y|Y for Yes, any other key for No) : No ... skipping. By default, MySQL comes with a database named 'test' that anyone can access. This is also intended only for testing, and should be removed before moving into a production environment. 为了安全应该yes Remove test database and access to it? (Press y|Y for Yes, any other key for No) : No ... skipping. Reloading the privilege tables will ensure that all changes made so far will take effect immediately. Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y Success. All done!
第四种：使用update
mysql> UPDATE mysql.user SET authentication_string = PASSWORD('Marry583@&%!'), password_expired = 'N' WHERE User = 'root' AND Host = 'localhost';
Query OK, 1 row affected, 1 warning (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
7、设置mysql远程访问
mysql> create user 'root'@'%' identified with mysql_native_password by 'your password'; Query OK, 0 rows affected (0.01 sec) mysql> grant all privileges on *.* to 'root'@'%' with grant option; Query OK, 0 rows affected (0.01 sec) mysql> flush privileges; Query OK, 0 rows affected (0.01 sec)
8、Navicat连接mysql，输入ip、用户名、密码，点击连接测试，提示连接成功，就可以正常使用了
