mysql安装和简单命令

mysql安装包及其依赖下载地址https://downloads.mysql.com/archives/community/

1、下载MySQL的安装文件
安装MySQL需要下面两个文件

  rpm -ivh mysql-community-server-5.7.28-1.el7.x86_64.rpm
  rpm -ivh mysql-community-client-5.7.28-1.el7.x86_64.rpm

另外还需两个依赖包

mysql-community-libs-5.7.28-1.el7.x86_64.rpm
mysql-community-common-5.7.28-1.el7.x86_64.rpm

下载方式地址如下（需注册登录oracle账户）：

wget https://downloads.mysql.com/archives/get/p/23/file/mysql-community-common-5.7.28-1.el7.x86_64.rpm
wget https://downloads.mysql.com/archives/get/p/23/file/mysql-community-libs-5.7.28-1.el7.x86_64.rpm
wget https://downloads.mysql.com/archives/get/p/23/file/mysql-community-client-5.7.28-1.el7.x86_64.rpm
wget https://downloads.mysql.com/archives/get/p/23/file/mysql-community-server-5.7.28-1.el7.x86_64.rpm 

2、安装mysql，执行如下命令依次安装，

[root@realhost ~]# rpm -ivh mysql-community-common-5.7.28-1.el7.x86_64.rpm
warning: mysql-community-common-5.7.28-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:mysql-community-common-5.7.28-1.e################################# [100%]

[root@realhost ~]# rpm -ivh mysql-community-libs-5.7.28-1.el7.x86_64.rpm
warning: mysql-community-libs-5.7.28-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:mysql-community-libs-5.7.28-1.el7################################# [100%]
[root@realhost ~]# rpm -ivh mysql-community-client-5.7.28-1.el7.x86_64.rpm
warning: mysql-community-client-5.7.28-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:mysql-community-client-5.7.28-1.e################################# [100%]
[root@realhost ~]# rpm -ivh mysql-community-server-5.7.28-1.el7.x86_64.rpm
warning: mysql-community-server-5.7.28-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
   1:mysql-community-server-5.7.28-1.e################################# [100%]
[root@realhost ~]# mysql --version
mysql  Ver 14.14 Distrib 5.7.28, for Linux (x86_64) using  EditLine wrapper

3、修改mysql默认密码

修改mysql配置文件

vim /etc/my.cnf

添加skip-grant-tables=1，取消数据库鉴权wq：保存退出   （修改完密码之后需要删除）

skip-grant-tables=1

重启mysqld服务

[root@realhost ~]# systemctl restart mysqld

登录数据库执行如下命令修改密码

[root@realhost ~]# vim /etc/my.cnf
[root@realhost ~]# systemctl restart mysqld
[root@realhost ~]# mysql -uroot
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.7.28 MySQL Community Server (GPL)

Copyright (c) 2000, 2019, 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> use mysql              //进入mysql库
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 password = password('123456') where user='root';  
ERROR 1054 (42S22): Unknown column 'password' in 'field list'     //mysql5.7版本以前使用此命令修改密码，5.7版本以后请使用下面命令
mysql> update user set authentication_string = password('123456') where user='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 1          //此处修改root的密码是123456

mysql> q
Bye

删除之前的配置文件重启mysqld服务使用修改后的密码登录

[root@realhost ~]# vim /etc/my.cnf
[root@realhost ~]# systemctl restart mysqld
[root@realhost ~]# mysql -uroot                //取消配置文件后无密码已经登录不上数据库了。
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
[root@realhost ~]# mysql -uroot -p123456           //使用密码123456登录成功，验证修改成功
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 3
Server version: 5.7.28

Copyright (c) 2000, 2019, 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>

mysql密码修改的三种方式：

[root@realhost ~]# mysqladmin -uroot -p123456 password "新密码"   //123456是旧密码
mysqladmin: [Warning] Using a password on the command line interface can be insecure.
Warning: Since password will be sent to server in plain text, use ssl connection to ensure password safety.

mysql>  set password for root@localhost=password("新密码");
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> alter user root@localhost identified by '新密码';
Query OK, 0 rows affected (0.00 sec)

修改密码报错处理

mysql>  set password for root@localhost=password("newpassword");
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

密码不满足策略要求，查看密码策略

mysql> SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+--------+
| Variable_name                        | Value  |
+--------------------------------------+--------+
| validate_password_check_user_name    | OFF    |
| validate_password_dictionary_file    |        |
| validate_password_length             | 8      |
| validate_password_mixed_case_count   | 1      |
| validate_password_number_count       | 1      |
| validate_password_policy             | MEDIUM |
| validate_password_special_char_count | 1      |
+--------------------------------------+--------+

密码策略是MEDIUM故密码需要包含 数字、小写字母、大写字母 、特殊字符、且长度至少8位

可以将密码策略改为0/LOW,就可以正常修改了。

mysql>   set password for root@localhost=password("12345678");
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> set global validate_password_policy=0
    -> ;
Query OK, 0 rows affected (0.00 sec)

mysql> set password for root@localhost=password("12345678");
Query OK, 0 rows affected, 1 warning (0.00 sec)

各项值说明

validate_password_policy：密码安全策略，默认MEDIUM策略

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