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host.docker.internal for Mule and Local Ollama: Configure and Troubleshoot the Connection

Use Docker’s host address in Mule’s HTTP request to reach Ollama on port 11434, and verify name resolution, binding, and runtime placement.
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When Mule runs in a Docker container, configure its HTTP request to reach Ollama on the Docker host at http://host.docker.internal:11434, followed by the Ollama API path you need. The hostname works only if it resolves and routes to the host from the Mule runtime’s actual container environment; it does not automatically point to your laptop in every Mule deployment.

Why the host address is different from localhost

Ollama’s local API is available on port 11434. Its documented API base is http://localhost:11434/api, while its OpenAI-compatible base is http://localhost:11434/v1. Inside a container, however, localhost refers to that container, not the Docker host. Replace the host portion with Docker’s host-service name: for example, use http://host.docker.internal:11434/api/chat for a chat request. This combines Docker’s host-address behavior with Ollama’s documented API paths; verify it in the Mule runtime where the flow will run.

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See Docker Desktop networking and Ollama’s API reference.

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Set up host resolution for the Docker environment

Docker Desktop

Docker Desktop provides host.docker.internal as the address for services running on the host. Use that hostname in Mule’s HTTP request configuration, with port 11434 and the endpoint your application requires.

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Docker Engine

If the hostname does not resolve in a Docker Engine container, add a host mapping when starting the container: --add-host host.docker.internal=host-gateway. Docker documents host-gateway as resolving to the host’s internal address; the gateway address can also be configured. Apply the mapping to the container or deployment configuration that runs Mule, then check name resolution from that same environment.

Docker’s documentation covers the Engine networking behavior and host-gateway configuration.

Configure the Mule HTTP request

  1. Start Ollama on the Docker host and confirm it responds locally on port 11434.

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  2. Determine whether Mule runs in Docker Desktop or Docker Engine, and make sure the hostname is available to that container.

  3. Set Mule’s HTTP request URL to http://host.docker.internal:11434 plus the API path. For example, use /api/chat for Ollama’s chat API or /api/generate for a generate request. Use /v1 when your application is calling Ollama’s OpenAI-compatible API.

  4. Send the request and confirm the response from the target runtime. Validate connectivity from the same container or runtime environment that Mule uses, rather than relying only on a successful request from the host machine.

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Ollama’s API documentation includes chat and generate endpoint examples. The API documentation says the API is not strictly versioned, is expected to remain stable and backwards compatible, and that deprecations are announced in release notes. Check the current documentation for endpoint details.

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Troubleshoot connection failures

  • Connection refused: Confirm Ollama is running and listening on port 11434. By default, Ollama binds to 127.0.0.1:11434, which may make it unreachable from a container through the host address.

  • Timeout: Check that host.docker.internal resolves in the Mule container, that the container has a route to the host, and that host firewall rules allow the connection.

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  • The host mapping is missing: On Docker Engine, add --add-host host.docker.internal=host-gateway if needed, then recreate or restart the Mule container with the mapping in place.

  • Ollama is bound only to loopback: Ollama documents OLLAMA_HOST for changing its listening address. Its FAQ gives 0.0.0.0:11434 as an example on macOS and Linux. This can expose Ollama beyond loopback, so consider the host firewall and network context before changing the bind address; do not treat the example as a universal security recommendation.

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  • Testing succeeds locally but fails in deployment: Check where Mule is actually running and test from that runtime. MuleSoft supports local and remote hosting options, including standalone and hybrid runtimes, Runtime Fabric, and CloudHub. In a remote or managed deployment, host.docker.internal—if supported there—would refer to the Docker host associated with that container environment, not inherently the developer’s workstation.

For the bind setting and platform-specific details, consult Ollama’s FAQ. For Mule hosting choices, see MuleSoft’s deployment overview. Instructions can vary by Mule runtime version, so check the documentation for the version you deploy.

Check the runtime boundary before relying on the hostname

This recipe applies to a Mule process in a Docker container that can resolve and route to its Docker host. It is not a universal address for every Mule deployment. Establish where the runtime is hosted, which Docker environment it uses, and whether that environment provides the hostname before setting the endpoint. Ollama also distinguishes local inference from cloud-hosted model requests in its data-handling FAQ; check the applicable mode when deciding what requests to send.

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