How to Determine MySQL Docker Container Readiness for Queries

Deploying multiple Docker containers, with MySQL as the initial one, raises the need to ensure MySQL's readiness for queries before proceeding with subsequent container builds. Scripts failing due to premature execution during MySQL's setup phase indicate this issue.

While a brute-force bash sleep solution is not ideal, a more refined approach can be achieved using the mysql-client package and mysqladmin. This tool enables pinging the target server to determine its availability. Incorporate it into a simple wait-loop as follows:

while ! mysqladmin ping -h"$DB_HOST" --silent; do
    sleep 1
done

By leveraging this technique, you can effectively wait for MySQL's setup completion within the Docker container, ensuring proper script execution and seamless continuation of your container deployment workflow.