I upgraded ddev and now the web container won't start

I upgraded ddev to v0.16.0 and now my web container won't start. It either fails the health check or something.

Solution

As of v0.16.0 and v0.17.0, ddev has some maturing to do with regard to upgrades. Currently, each upgrade has been requiring a few things:

Delete the project's .ddev/docker-compose.yaml
Re-run ddev config or delete the "webimage" and "dbimage" lines in .ddev/config.yaml
If you have made customizations to your nginx config, remove those from the .ddev folder and recreate them as suggested in the release notes.

Full details are in the release notes.