yum安装mysql5.6.49

一 安装前准备

（1）卸载虚拟机自带的mysql相关包

 rpm -qa | grep mysql 

rpm -e --nodeps  名称　　卸载

查询所有Mysql对应的文件夹

# whereis mysql
mysql: /usr/bin/mysql /usr/lib64/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz

删除相关目录或文件

rm -rf /usr/bin/mysql /usr/lib64/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz

检查mysql用户组和用户是否存在

 cat /etc/group | grep mysql
cat /etc/passwd |grep mysql

（2）从官网下载是用于Linux的Mysql安装包

 

 

下载安装包或者直接下载

wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm

 

 

 

 更新仓库信息

yum clean all&&yum repolist

 

 安装

[root@localhost yum.repos.d]# yum list | grep mysql-com
mysql-community-client.x86_64 5.6.49-2.el6 @mysql56-community
mysql-community-common.x86_64 5.6.49-2.el6 @mysql56-community
mysql-community-libs.x86_64 5.6.49-2.el6 @mysql56-community
mysql-community-libs-compat.x86_64 5.6.49-2.el6 @mysql56-community
mysql-community-server.x86_64 5.6.49-2.el6 @mysql56-community
mysql-community-bench.x86_64 5.6.51-2.el7 mysql56-community
mysql-community-client.i686 5.6.51-2.el7 mysql56-community
mysql-community-client.x86_64 5.6.51-2.el7 mysql56-community
mysql-community-common.i686 5.6.51-2.el7 mysql56-community
mysql-community-common.x86_64 5.6.51-2.el7 mysql56-community
mysql-community-devel.i686 5.6.51-2.el7 mysql56-community
mysql-community-devel.x86_64 5.6.51-2.el7 mysql56-community
mysql-community-embedded.i686 5.6.51-2.el7 mysql56-community
mysql-community-embedded.x86_64 5.6.51-2.el7 mysql56-community
mysql-community-embedded-devel.i686 5.6.51-2.el7 mysql56-community
mysql-community-embedded-devel.x86_64 5.6.51-2.el7 mysql56-community
mysql-community-libs.i686 5.6.51-2.el7 mysql56-community
mysql-community-libs.x86_64 5.6.51-2.el7 mysql56-community
mysql-community-release.noarch el7-5 mysql-connectors-community
mysql-community-server.x86_64 5.6.51-2.el7 mysql56-community
mysql-community-test.x86_64 5.6.51-2.el7 mysql56-community

根据需要安装

yum  install mysql-community-server.x86_64 5.6.51-2.el7 -y

初始化

systemctl start mysqld

查看目录有没有生成

cd /var/lib/mysql

过滤mysql密码

grep 'password' /var/log/mysqld.log

登录数据库

mysql -uroot -p'初始化密码'

 

update user set password=password(“111111”) where user=‘root’;

修改用户密码(此处根据需要操作)

set password for'username'@'host' = password('newpassword'); //设置指定用户的密码
set password = password('newpassword'); // 设置当前登录用户的密码

 

 

 报错：

1.ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(123) where user=root' at line 1

 ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';

2.mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY '******';

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements　　　　#满足密码规则要求即可

3.

SHOW VARIABLES LIKE 'validate_password%';
+--------------------------------------+--------+
| Variable_name | Value |
+--------------------------------------+--------+
| validate_password.check_user_name | ON |
| 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 |
+--------------------------------------+--------+

 

set global validate_password.policy==LOW;　　　　#按照自己要求设置规则

 

 

关于 mysql 密码策略相关参数；
1）、validate_password_length  固定密码的总长度；
2）、validate_password_dictionary_file 指定密码验证的文件路径；
3）、validate_password_mixed_case_count  整个密码中至少要包含大/小写字母的总个数；
4）、validate_password_number_count  整个密码中至少要包含阿拉伯数字的个数；
5）、validate_password_policy 指定密码的强度验证等级，默认为 MEDIUM；
关于 validate_password_policy 的取值：
0/LOW：只验证长度；
1/MEDIUM：验证长度、数字、大小写、特殊字符；
2/STRONG：验证长度、数字、大小写、特殊字符、字典文件；
6）、validate_password_special_char_count 整个密码中至少要包含特殊字符的个数；

关于 mysql 密码策略问题 就解决了