linux安装配置mysql

系统Ubuntu 18.04.2 LTS

1. 安装

   sudo apt-get install mysql-server
   

2. 安装后设置密码

   sudo cat /etc/mysql/debian.cnf  # 获取默认密码
   

   

   mysql -u debian-sys-maint -p  # 使用默认的账号密码登陆：
   
   # 修改root密码为123456；
   update mysql.user set authentication_string=password('123456') where user='root';	
   
   刷新数据库并重启服务
   flush privileges;
   exit;
   service mysql restart;
   

   如果刚设置的root账号还是无法登陆：
   
   这个问题可能是由于Ubuntu默认安装的mysql使用的plugin是auth_socket：
   
   需要修改plugin为mysql_native_password即可：

   mysql> update user set plugin='mysql_native_password' where User='root';
   
   # 刷新数据库并重启服务
   mysql> flush privileges;
   mysql> exit;
   service mysql restart;
   

3. 开远程登陆权限

   # 登陆mysql，给root添加远程权限
   mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456';
   
   mysql> use mysql;
   
   设置后查询：
   mysql> select  User,authentication_string,Host from user;
   +------------------+-------------------------------------------+-----------+
   | User             | authentication_string                     | Host      |
   +------------------+-------------------------------------------+-----------+
   | root             |                                           | localhost |
   | mysql.session    | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | localhost |
   | mysql.sys        | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | localhost |
   | debian-sys-maint | *EC48E50E78101AA4E9A3C6BDC853EF1FAC334D07 | localhost |
   | root             | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | %         |
   +------------------+-------------------------------------------+-----------+
   

   修改配置文件：

   sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf
   注：有的可能在 /etc/mysql/my.cnf
   找到bind-address = 127.0.0.1
   bind-address = 127.0.0.1 修改为
   #bind-address = 127.0.0.1（注释掉）
   

   重启数据库服务: service mysql restart;