【mysql】配置MySQL，解决安装过程中的问题

在文章，Centos6.2中mysql的安装与配置中，使用yum的方式安装了mysql 。再次安装的时候跟系统的环境有关系，遇到了不少问题。记录一下。

  yum 安装 出错 Error: Protected multilib versions:

    

  file /usr/share/man/man1/mysqlshow.1.gz from install of mysql-5.1.73-8.el6_8.x86_64 conflicts with   file from package MySQL-client-5.5.48-1.linux2.6.i386

  file /usr/share/man/man1/mysqlslap.1.gz from install of mysql-5.1.73-8.el6_8.x86_64 conflicts with   file from package MySQL-client-5.5.48-1.linux2.6.i386

  解决方案：rpm -e mysql-server-5.1.73-8.el6_8.x86_64 --nodeps

 
170721 22:25:03 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
  /usr/libexec/mysqld: Table 'mysql.plugin' doesn't exist
  170721 22:25:03 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
  170721 22:25:03  InnoDB: Initializing buffer pool, size = 8.0M
  170721 22:25:03  InnoDB: Completed initialization of buffer pool
  InnoDB: The log sequence number in ibdata files does not match
  InnoDB: the log sequence number in the ib_logfiles!
  170721 22:25:03  InnoDB: Database was not shut down normally!
  InnoDB: Starting crash recovery.
  InnoDB: Reading tablespace information from the .ibd files...
  InnoDB: Restoring possible half-written data pages from the doublewrite
  InnoDB: buffer...
  170721 22:25:03  InnoDB: Started; log sequence number 0 1595675
  170721 22:25:03 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
  170721 22:25:03 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
  170721 22:25:24 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
  /usr/libexec/mysqld: Table 'mysql.plugin' doesn't exist
170721 22:25:24 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
  170721 22:25:24  InnoDB: Initializing buffer pool, size = 8.0M
  170721 22:25:24  InnoDB: Completed initialization of buffer pool
  InnoDB: The log sequence number in ibdata files does not match
  InnoDB: the log sequence number in the ib_logfiles!
  170721 22:25:24  InnoDB: Database was not shut down normally!
  InnoDB: Starting crash recovery.
  InnoDB: Reading tablespace information from the .ibd files...
  InnoDB: Restoring possible half-written data pages from the doublewrite
  InnoDB: buffer...
  170721 22:25:24  InnoDB: Started; log sequence number 0 1595675
  170721 22:25:24 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
  170721 22:25:24 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
  170721 22:25:37 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
  /usr/libexec/mysqld: Table 'mysql.plugin' doesn't exist
170721 22:25:37 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.

  安装完启动的时候遇到上述问题。

  解决方案：rm -rf /var/lib/mysql

 登陆mysql

  [root@root opt]# mysql -u root password fxq123

  mysqladmin: connect to server at 'localhost' failed

  error: 'Access denied for user 'root'@'localhost' (using password: NO)'

  ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

  解决方案：使用mysql -uroot -proot

 一旦登录之后，可以修改用户的账号和密码，

  查看用户授权表：select user,host,password from mysql.user;

  给用户设置密码：update mysql.user set password=PASSWORD('root') where user='root';

             flush privileges;