The MySQL server has gone away (error 2006) has two main causes and solutions:
- Server timed out and closed the connection. To fix, check that
wait_timeoutmysql variable in your my.cnf configuration file is large enough, eg
wait_timeout = 28800
- You may also need to increase the
innodb_log_file_sizemysql variable in your my.cnf configuration to for example
innodb_log_file_size = 128MBor higher.
- Server dropped an incorrect or too large packet. If mysqld gets a packet that is too large or incorrect, it assumes that something has gone wrong with the client and closes the connection. To fix, you can increase the maximal packet size limit
max_allowed_packetin my.cnf file, eg. set
max_allowed_packet = 128M, then restart your MySQL server:
sudo /etc/init.d/mysql restart
Once you’ve made these changes, and restarted your MySQL or MariaDB server, the issue should be fixed and no more error triggered. If not, try increase the 128M values to 256M for example.
You may be interested to learn more about Matomo Analytics to measure your websites and apps and keep control of your analytics data.