• All Joomla websites hosted on single virtual server are down.
  • Trying to access any of the sites, web browsers display following errors:
    Infinite loop detected in JError

    Database Error: Unable to connect to the database:Could not connect to MySQL
  • phpMyAdmin web interface displays login screen would not allow to login (simply reloads the page after submitting credentials).
  • Trying to connect to MySQL via console fails with errors:
    ERROR 1040 (hy000): Too many connections
    ERROR 2002   (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)


mySQL log file /var/log/mysql/error.log finally revealed that the problem was caused by lack of space on the disk:
[ERROR] /usr/sbin/mysqld: Disk is full writing './<database_name>/<table_name>.MYD' (Errcode: 28). Waiting for someone to free space... (Expect up to 60 secs delay for server to continue after freeing disk space)


Pretty obvious - free up some space on the hard drive.

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