Good Evening

How to detect if Docker's MySQL is done initializing

 
  • Jul 25, 2024

If you use docker-entrypoint-initdb.d/, you can check if it’s done through the port availability

Check if the port is used. MySQL doesn’t reserve the port until it’s entirely done importing from docker-entrypoint-initdb.d/.

if exec 6<>"/dev/tcp/localhost/$MYSQL_TCP_PORT"; then
  echo "MySQL is ready!"
else
  echo "MySQL is not ready!"
fi

You can put this as a separate .sh file that’s copied to the container, or directly put it into your compose healthcheck. I personally prefer copying it into the container, the syntax of commands on the compose file is funky. I’ve tested this a few times, it seems to be working consistently.

See how I used it in action: In the osu-data Repository

A short port, but I took a few months to solve this, hope this helps someone!

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