90003 Eve-ng — Database Error

EVE-NG relies on a local MySQL database to store everything: user credentials, lab topologies, node configurations, and permission settings. When the EVE-NG GUI (the web interface) cannot talk to the database backend, it throws this error.

systemctl stop mysql Now, run the MySQL safe recovery mode to force a repair of the EVE database:

killall mysqld systemctl start mysql systemctl restart eve-ng Warning: This resets user accounts to default (admin/eve). It does NOT delete your lab topologies or images.

repair table auth_behavior; repair table labs; repair table nodes; repair table users; exit; Finally, kill the safe mode process and restart normally: Database Error 90003 Eve-ng

mysqld --datadir=/var/lib/mysql --skip-grant-tables --skip-networking & Next, log into MySQL manually (no password required due to skip-grant):

systemctl status mysql If it shows active (running) , go back to your web browser, clear your cache, and refresh. If the error is gone—congratulations, you’re done. If MySQL fails to start or restarting didn't fix the GUI, the database tables are likely corrupted.

Bookmark this guide. If you run EVE-NG long enough, you will see this error again. When you do, just SSH in, restart MySQL, and get back to learning. EVE-NG relies on a local MySQL database to

In this post, we’re going to dissect what Error 90003 actually means, why it happens, and—most importantly—how to fix it permanently. In simple terms, Error 90003 is a MySQL database connection failure.

If nothing else works:

You try to start a node, save the topology, or even log in, and you’re met with a red pop-up: . It does NOT delete your lab topologies or images

mysql -u root eve_ng_prod Once inside the MySQL prompt ( mysql> ), run the repair command:

systemctl restart mysql Now, check if it is actually running:

It’s vague. It’s frustrating. And it usually brings your lab building session to a screeching halt.

First, stop the service:

If you’ve spent any time building labs in EVE-NG, you know the feeling. You’re in the zone, dragging nodes onto the canvas, linking interfaces, and powering up routers. Suddenly, you hit a wall.