The kettle running batch of log analysis slowed down for no reason, and the problem was not solved after analyzing various situations. I decided to restart the server. After restarting the server, I found that the above mysql database could not be started. The prompt is as follows: /usr/libexec/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
110222 11:15:07 mysqld_safe Starting mysqld daemon with databases from /home/mysql 110222 11:15:07 [Warning] Can't create test file /home/mysql/localhost.lower-test 110222 11:15:07 [Warning] Can't create test file /home/mysql/localhost.lower-test /usr/libexec/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13) 110222 11:15:07 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 110222 11:15:07 InnoDB: Operating system error number 13 in a file operation. InnoDB: The error means mysqld does not have the access rights to InnoDB: the directory. InnoDB: File name ./ibdata1 InnoDB: File operation call: 'open'. InnoDB: Cannot continue operation. 110222 11:15:07 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
The solution is as follows:
#Enter the following line in the terminal
chown -R mysql:mysql /home/data/mysql #Enter
the following line and it will be OK
chcon -R -t mysqld_db_t /home/mysql
#Restart MYSQL and try~
Restarting mysql is OK, but when accessing the database table, it prompts: Unknown table engine 'InnoDB', I have used various methods on the Internet, and modified my.cnf N times, but it has not been solved. Finally , setenforce 0 is turned off on the firewall , and the data can be accessed normally.
Baidu a bit, still do not understand what is the relationship between firewall and innodb? Document the problem and provide a solution for those who encounter this problem later.