The MongoDB health check passed only on the writable primary
(db.hello().isWritablePrimary or isMaster().ismaster). A replica set
that was never initiated, which is common for Prisma setups, and any
non-primary member were reported unhealthy after a restart.
The check now runs db.adminCommand({ ping: 1 }) with mongosh or the
legacy mongo shell. Ping needs no authentication, passes on every
running member, and still fails when mongod is not reachable.
The health check from #11730 picked mongosh or the legacy mongo shell
from the image name (mongo:4*). Images without mongosh whose name does
not start with mongo:4, such as mongo:3.6 or registry mirrors of
mongo:4.4, ran a missing mongosh (exit 127) and stayed unhealthy.
The check now uses mongosh when the container has it and falls back
to the legacy mongo shell otherwise.
Replace the test that only checked the source text with tests that run
the generated script with fake shells.
Andras Bacsai
Christoph Bratschi