MySQL/MariaDB will sometimes hit its open file limit when doing large mysqldump operations. On a lot of distributions you can raise the limit by adding the following line to the /etc/my.cnf file and restarting the service: open_files_limit=XXXX This doesn’t work on systemd controlled database services so you need to add the following lines to /etc/systemd/system/mariadb.service.d/limits.conf […]