Analyze the installation and use of mysql (Collection)

In the previous article "Teach you step by step how to enable https and http2 for the site (with code)", I introduced you how to enable https and http2 for the site. The following article will help you understand the installation and use of mysql. Please keep it in your collection~

##Mysql installation and use

Download

#1 先去https://repo.mysql.com/ 下载最新的repo源
$ wget https://repo.mysql.com/mysql80-community-release-sles12-2.noarch.rpm

#2 安装mysql80-community-release-sles12-2.noarch.rpm包
$ sudo rpm -ivh mysql80-community-release-sles12-2.noarch.rpm

#假如报错提示冲突的话， 先查询下是不是已经安装过了
$ rpm -qa | grep mysql
#有的话干掉他  --nodeps 强制卸载
$ rpm -e xxx (--nodeps) #xxx为冲突的rpm名称

Install mysql

$ sudo yum install mysql-community-server #安装
$ service mysqld start #启动
$ sudo service mysqld status #检查MySQL服务状态

$ sudo grep 'temporary password' /var/log/mysqld.log #查看初始密码


$ mysqld -V  #查看版本

Reset password

$ mysql -u root #需要输入初始密码

#修改root登录密码,注意要切换到mysql数据库，使用use mysql
$ ALTER USER 'root'@'localhost' IDENTIFIED BY '密码';

Remote login

# 需要更改权限才能实现远程连接MYSQL数据库  

$ mysql -h localhost -uroot -p #输入密码登录
mysql> use mysql;   #此DB存放MySQL的各种配置信息
mysql> select host,user from user; #查看用户的权限情况
mysql> select host, user, password from user;
mysql> update user set host = '%' where user ='root';
# %表示是所有的外部机器，如果指定某一台机，就将%改为相应的机器名；‘root’则是指要使用的用户名

mysql> flush privileges; #运行此句才生效，或者重启MySQL

The last step is to add rules to open the 3306 port in the server firewall configuration

FAQ

ER_NOT_SUPPORTED_AUTH_MODE: Client does not support authentication protocol requested by server; consider upgrading MySQL client

mysql -u root -p  #输入密码登录

#yourpassword 是你的数据库账户密码，root和host也是
ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';

#大意是8.0.4开始mysql引入一个caching_sha2_password模块作为默认身份验证插件，数据库连接时验证身份的工作方式(handshake process)会与以往不同。

ERROR 1396 (HY000): Operation ALTER USER failed for ' root'@'localhost'

mysql -u root -p
mysql> use mysql;
mysql> select user,host from user;

+------------------+-----------+
| user             | host      |
+------------------+-----------+
| root             | %         |
| admin            | localhost |
| mysql.infoschema | localhost |
| mysql.session    | localhost |
| mysql.sys        | localhost |
| zhangj           | localhost |
+------------------+-----------+

#注意root，host是'%',你可能执行的是:
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123';
# 改成:
ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123';

Recommended learning:

Mysql video tutorial

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