Ignition Docker with sql database

I'll also augment that as of Docker Engine 20.10, you can also use host.docker.internal mapping on Linux (where it was previously only available on Docker Desktop). You do have to add an extra_hosts mapping to your container definition though, such as:

docker run ... --add-host "host.docker.internal:host-gateway" ...

... or in your Compose YAML:

services:
  gateway:
    ...
    extra_hosts:
      - "host.docker.internal:host-gateway"
    ....

With this, the hostname host.docker.internal will resolve to your docker0 bridge IP on the host.

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