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root权限

• 打开terminal命令行
• 输入sudo su
• 输入初始密码freeproblemset

• mysql数据库的密码的位置，如何登陆数据库

  数据库账号密码存放在两个配置文件中：

  • /home/judge/etc/judge.conf
  • /home/judge/src/web/include/db_info.inc.php

  新版本中，快速登陆mysql的脚本在install目录里，名字为mysql.sh使用方法

  • sudo bash /home/judge/src/install/mysql.sh

  参考：Hustoj-FQA

  登陆数据库报错（socket错误）

  ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)

  1. 首先检查是否安装了mysql-server了
     sudo apt-get install mysql-server to install mysql on ubuntu， 如果mysql-server已经存在了，那么在去尝试一下是否成功，如果还是这个错误的话那么就是文件/var/run/mysqld/mysqld.sock 不存在。

  2. 如果/var/run/mysqld/mysqld.sock文件不存在应该怎么办？
     执行

     vim /etc/mysql/my.cnf 将会看到内容如下：

  #
  # The MySQL database server configuration file.
  #
  # You can copy this to one of:
  # - "/etc/mysql/my.cnf" to set global options,
  # - "~/.my.cnf" to set user-specific options.
  #
  # One can use all long options that the program supports.
  # Run program with --help to get a list of available options and with
  # --print-defaults to see which it would actually understand and use.
  #
  # For explanations see
  # http://dev.mysql.com/doc/mysql/en/server-system-variables.html
  #
  # * IMPORTANT: Additional settings that can override those from this file!
  # The files must end with '.cnf', otherwise they'll be ignored.
  #
  !includedir /etc/mysql/conf.d/
  !includedir /etc/mysql/mysql.conf.d/
  

  你的mysql的配置在/etc/mysql/mysql.conf.d目录下的mysqld.cnf文件，打开如下：
  可以看到:bind-address = 127.0.0.1 socket = /var/run/mysqld/mysqld.sock 等信息

  我的虚拟机是/var/run下面没有mysqld目录，执行下面命令，然后目录和sock文件就都有了

  sudo mkdir -p /var/run/mysqld
  sudo chown mysql /var/run/mysqld/
  sudo service mysql restart