centos7 installation mysql5.7 version (full)

centos installation

Imprint: centos7, mysql5.7, not centos7 Some commands may not be compatible

Install mysql-server

# 下载并安装 mysql yum 
wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
yum -y install mysql57-community-release-el7-10.noarch.rpm

# 安装 mysql-server
yum -y install mysql-community-server

mysql initial installation of some configuration

# 启动 mysql-serer 
systemctl start mysqld.service
# 查看是否启动成功，即是否存在 3306 端口
netstat -tnlp | grep 3306
# 查询 root 密码，登录到 mysql
grep "password" /var/log/mysqld.log
mysql -uroot -p 

# 首次操作要求重置密码,必须大小写特殊字符组成
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new password';

# 授权远程访问 % 表示所有主机都可以访问
mysql> grant all privileges on *.* to 'root'@'%' identified by 'password' with grant option;
# 刷新权限信息
mysql> flush privileges;

Modify the character set

vi /etc/my.cnf

[client]
default-character-set=utf8

[mysqld]
character-set-server=utf8
collation-server=utf8_general_ci

# 重启 mysql 
systemctl restart mysqld.service

# 查看是否配置成功
mysql> status; 

Server characterset:    utf8
Db     characterset:    utf8
Client characterset:    utf8
Conn.  characterset:    utf8

Configuration You can use weak passwords

Mysql after upgrading to version 5.7, the passwords are strengthened

mysql.user modify the password field authentication_string
Adds password authentication plug-in

# 查看当前密码规则
mysql> show variables like 'validate_password%';
+--------------------------------------+--------+
| Variable_name                        | Value  |
+--------------------------------------+--------+
| validate_password_check_user_name    | OFF    |
| validate_password_dictionary_file    |        |
| validate_password_length             | 8      | 密码最小长度
| validate_password_mixed_case_count   | 1      | 密码大写小写混合个数
| validate_password_number_count       | 1      | 密码数字个数
| validate_password_policy             | MEDIUM | 密码检查等级
| validate_password_special_char_count | 1      | 密码特殊字符个数
+--------------------------------------+--------+

There are two solutions, one is to change the validation rules, the second is a direct uninstall password authentication plug-in

Uninstall password authentication plug-in

mysql> uninstall plugin validate_password;

Modify validation rules

mysql> set global validate_password_policy=0;
mysql> set global validate_password_mixed_case_count=0;
mysql> set global validate_password_number_count=3;
mysql> set global validate_password_special_char_count=0;
mysql> set global validate_password_length=3;

Modify the mysql password

If you are already logged in mysql, you can change the password directly

# 方法一. 设置当前登录用户密码
mysql> set password=password('newpassword');
# 方法二. 直接改用户表
mysql> use mysql;
mysql> update user set authentication_string=password('123abc') where user='root';
# 方法三. 修改密码
mysql> alter user root@'localhost' identified by '123456';

If you do not log in mysql, you can skip the check permission to modify the password

vi /etc/my.cnf
[mysqld]
skip-grant-tables

# 然后重启 mysql，不需要 root 密码登录 mysql ，之后随便你怎么玩

windows installation

In general NEXT NEXT get away, but then I could download a test version, there is a 1045 error, it estimated the current version is not right. In fact, the solution is to skip the permissions check, reset your password, here to give the novice a method of operation

1. 先停止 mysql 服务，然后 cmd 到 mysql 的 bin 目录
2. mysqld -nt --skip-grant-tables
3. 启动 mysql 执行 mysqladmin -u root flush-privileges password <password>

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