Mike Bridge fef0a64b21 fix(docker): MySQL examples DB + EXAMPLES_PORT override (sc-105349) ...

Fix two follow-on issues reported when starting the dev stack with
docker-compose-mysql.yml:

1. ``superset-init`` step 4 (load-examples) fails with
   ``MySQLdb.OperationalError: (2002, "Can't connect to server on 'db'")``
   because the analytics-examples DB connection inherits ``EXAMPLES_PORT=5432``
   (Postgres port) from ``docker/.env``. The override flipped
   ``DATABASE_DIALECT`` to ``mysql+mysqldb`` but left the EXAMPLES_*
   group on Postgres defaults, so the URI became
   ``mysql+mysqldb://examples:examples@db:5432/examples`` — MySQL
   container has no listener on 5432.

   Fix: add ``EXAMPLES_HOST/PORT/DB/USER/PASSWORD`` and a complete
   ``SUPERSET__SQLALCHEMY_EXAMPLES_URI`` to the ``mysql-env`` anchor.

2. The Postgres init scripts under
   ``docker/docker-entrypoint-initdb.d/`` (``cypress-init.sh``,
   ``examples-init.sh``) get mounted on the MySQL container too —
   compose merges volume lists. They invoke ``psql`` which doesn't
   exist in the MySQL image, abort with ``psql: command not found``,
   and prevent the ``examples`` DB from being created.

   Fix: add a MySQL-specific init script
   ``docker/mysql-init/examples-init.sql`` that creates the
   ``examples`` database and user, and mount it at
   ``/docker-entrypoint-initdb.d`` in the override. Compose's
   later-takes-precedence rule on duplicate volume targets displaces
   the Postgres init dir, so the MySQL container only sees the
   MySQL-compatible script.

   (Used a plain duplicate-target mount rather than the ``!override``
   tag because pre-commit's ``check-yaml`` doesn't recognize Compose's
   custom YAML tags.)

Recovery for an existing failed MySQL stack: ``docker compose -f
docker-compose.yml -f docker-compose-mysql.yml down``, then
``docker volume rm superset_db_home_mysql`` (so the new init script
runs on the next fresh boot), then ``up`` again.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-19 18:42:05 -06:00

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