一、下载mysql5.7的rpm安装包

      rpm的mysql包,安装起来简单,解压版的mysql还需要做许多配置，稍有不慎就会出错！！！

二、上传mysql安装包到centos7的系统下

  系统配置

三、安装依赖

3.1、 查看linux上是否已经安装了mysql,有则卸载

一般centos7默认安装了mariadb,这里把它卸载

[root@hdp02 mysql]#  rpm -qa|grep mariadb
mariadb-libs-5.5.52-1.el7.x86_64
[root@hdp02 mysql]# rpm -e mariadb-libs-5.5.52-1.el7.x86_64
error: Failed dependencies:
	libmysqlclient.so.18()(64bit) is needed by (installed) postfix-2:2.10.1-6.el7.x86_64
	libmysqlclient.so.18(libmysqlclient_18)(64bit) is needed by (installed) postfix-2:2.10.1-6.el7.x86_64
[root@hdp02 mysql]#  rpm -qa|grep mariadb
mariadb-libs-5.5.52-1.el7.x86_64
[root@hdp02 mysql]# rpm -e --nodeps  mariadb-libs-5.5.52-1.el7.x86_64

3.2 、安装mysql5.7所需要的依赖

重点：安装这个版本的mysql ，这三个 一定要安装 ，不然可能会出错，安了又不吃亏，切记要装，别人我不知道，自己一定要装！

[root@hdp02 mysql]#  yum install libaio
[root@hdp02 mysql]#  yum install perl
[root@hdp02 mysql]# yum install net-tools

yum install libaio
yum install perl
yum install net-tools

四、安装

4.1、安装的顺序如下图

4.2. 按照顺序安装

[root@hdp02 mysql]# rpm -ivh mysql-community-common-5.7.19-1.el6.x86_64.rpm
[root@hdp02 mysql]# rpm -ivh mysql-community-libs-5.7.19-1.el6.x86_64.rpm
[root@hdp02 mysql]# rpm -ivh mysql-community-client-5.7.19-1.el6.x86_64.rpm
[root@hdp02 mysql]# rpm -ivh --nodeps  mysql-community-server-5.7.19-1.el6.x86_64.rpm

rpm -ivh mysql-community-common-5.7.19-1.el6.x86_64.rpm
rpm -ivh mysql-community-libs-5.7.19-1.el6.x86_64.rpm
rpm -ivh mysql-community-client-5.7.19-1.el6.x86_64.rpm
rpm -ivh --nodeps  mysql-community-server-5.7.19-1.el6.x86_64.rpm

4.3、启动并且查看启动状态

 4.4、 修改密码

[root@hdp01 mysql]# cat /var/log/mysqld.log | grep password
2020-05-26T10:17:28.249686Z 1 [Note] A temporary password is generated for root@localhost: 3#hsL78s1UJy
2020-05-26T10:17:44.747705Z 3 [Note] Access denied for user 'UNKNOWN_MYSQL_USER'@'localhost' (using password: NO)

 

 报密码安全错误：ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

mysql>  set password = password("123456");
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

修改密码安装等级和长度

set global validate_password_policy=LOW; 
set global validate_password_length=6;

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

mysql> set global validate_password_length=6;
Query OK, 0 rows affected (0.00 sec)

## 展示 密码的等级，长度信息
mysql> show variables like 'valiedate_password%';
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

报错：ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

退出重新登录

mysql> show variables like 'validate_password%';
+--------------------------------------+-------+
| Variable_name                        | Value |
+--------------------------------------+-------+
| validate_password_check_user_name    | OFF   |
| validate_password_dictionary_file    |       |
| validate_password_length             | 6     |
| validate_password_mixed_case_count   | 1     |
| validate_password_number_count       | 1     |
| validate_password_policy             | LOW   |
| validate_password_special_char_count | 1     |
+--------------------------------------+-------+
7 rows in set (0.00 sec)

4.5 、查看数据库编码

mysql> show variables like 'character%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | latin1                     |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | latin1                     |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

使用命令可以修改 编码方式

set character_set_database = utf8;
set character_set_server = utf8;