Aug 20, 2025
Workflow automation is one of those things that often works best when you host it yourself. Why? Because the tools you chain together usually require (sensitive) internal data, self-hosting lets you keep full control while also keeping costs down. That goes doubly so for AI-driven workflow automation—who knows what might happen to sensitive data once it’s passed onto the “black boxes” of popular AI efforts.
That said, it’s easy for any self-hosting effort to get caught up in deployment and security red tape. How are you going to deploy and maintain it? Are you really going to port forward and doxx your IP to the world? A VPN works for sharing with colleagues, but what about external APIs or receiving webhooks?
For the first question, that’s why Docker exists in the first place. Docker Desktop, in particular, makes deploying AI workflows ridiculously easy.
For everything else, there’s ngrok’s gateways and our new Docker Desktop extension, which makes sharing your AI workflow automations easy to configure (less waiting on IT) and security-first (no more getting scolded by the network folks).
In this quick guide, I’ll walk you through two gateways you can ship here to get the job done.
- The three-click gateway
- The secure (but still simple) gateway
Big fan of video? Click the big red button to get a short-and-sweet edition of this setup—but read the rest for all the details.
The self-hosted AI workflow architecture
- ngrok
- ngrok is a flexible, globally distributed gateway that helps you share apps, APIs, devices, or entire networks with the world… and then lock them down exactly as you need with configurable policies written in YAML. It started long ago as “online in one line,” but now covers advanced API gateway features in ways that remain simple to configure and maintain.
- ngrok will receive, authenticate (if you let it), and forward all the traffic to your self-hosted AI workflows.
- Docker
- Docker (Engine) helps you download and deploy software packaged in lightweight, isolated containers.
- Docker Desktop simplifies the developer experience around starting and running containerized software by replacing the
dockerCLI with a GUI for macOS, Windows, and Linux, while still exposing all the nuances “under the hood.”
- n8n
- With a hugely popular open-source repo, n8n is a workflow automation platform with a visual builder and tons of integrations with both remote and local software like LLMs.
- Ollama - Open-source developer tooling, mostly on the CLI but with a small desktop GUI as well, to help you download, manage, and self-host LLMs. -
gpt-ossis a new open-weight model that was, according to OpenAI, “designed for powerful reasoning, agentic tasks, and versatile developer use cases. ” You could also pick DeepSeek-R1, Gemma 3, or anything else from Ollama’s library. - Your local compute
- The beauty of self-hosting is that it works with any system whose resources and uptime you want to spare—that could be the laptop you use for work, a cluster of Raspberry Pis in the closet, or a VM in the cloud.
This architecture is also an infinitely repeatable pattern. Just replace n8n and Ollama with the containerized services you need to run, and you’re off to the races with far more control and less cost than relying solely on a platform as a service (PaaS) provider.
What you’ll need
Start with Docker Desktop installed and sign up for a free ngrok account if you don’t already have one.
I also recommend you reserve a static subdomain (like your-ai-workflow.ngrok.app or bring your custom domain to ngrok so we can handle certificates on your behalf.
You can create random and purely ephemeral public URLs with ngrok, but it’s not particularly useful long-term.
I’ll refer to that as $NGROK_DOMAIN from here on out.
Set up your self-hosted AI workflow
All this happens directly within Docker Desktop—nice and tidy.
Ollama
Click on Docker Hub, search for Ollama, click Run. Give it a name like ollama (wild, I know) and the default host port of 11434.
Click Exec to enter the containers CLI and pull a model like gpt-oss:
ollama pull gpt-ossn8n
Just as you did with Ollama, find n8n and run it.
I highly recommend these optional settings:
- Container name:
n8n(just… because) - Host port:
5678(defaults are good) - Volumes:
n8n_data//home/.node.n8n(to create a volume for n8n that’s separate from the container itself) - Environment variables:
N8N_EDITOR_BASE_URL/$NGROK_DOMAIN(to let n8n know it’s not being hosted onlocalhostforever)- If you really want to use a random ngrok URL, then you can leave this blank.
When you click Run, Docker Desktop drops into the container’s logs.
Your editor won’t quite yet be available via $NGROK_DOMAIN, but it will be soon.
All done running new containers.
ngrok’s Docker Desktop extension
Here’s the direct link, or you can click Extensions -> Manage -> Browse and search for ngrok there.
Once installed, click Open. You’ll need your ngrok authtoken, which you can copy from the dashboard and paste into Docker Desktop.
Next up: sharing your containers on the public internet.
The three-click gateway
- The + icon next to your n8n container to create a new endpoint.
Leave the default Public setting, but if you have an
$NGROK_DOMAIN, drop that in as the URL. - Next Step.
- Skip and Create Endpoint. This completely ignores the incredible power of Traffic Policy (more on that soon), but I did promise you three clicks.
You’ll have a public endpoint and URL for your n8n instance that you or others can access from anywhere.
As some ngrokkers like to say (when not “doglabbing” ngrok): It’s just that shrimple.
The secure (but still simple) gateway
A bundle of security-conscious neurons might’ve jumped to life at the phrase just above: you or others can access from anywhere.
It’s actually quite scary to have a self-hosted service available on the public internet—you never quite know what anyone is up to, and even though n8n comes with user management built-in, someone could still hammer the login page into oblivion trying an automated attack against common username:password patterns.
hunter2, anyone?
Authentication is one place where ngrok shines as a gateway to your self-hosted services. And Traffic Policy is a configuration language that gives you complete control over how traffic gets to your apps—or if it should get there at all.
In Docker Desktop, click those three dots next to your endpoint, then Edit Endpoint. Scroll down a bit for the Traffic Policy input and paste in this policy.
1on_http_request:2 - actions:3 - type: oauth4 config:5 provider: google6 - expressions:7 - "!actions.ngrok.oauth.identity.email.endsWith('@example.com')"8 actions:9 - type: custom-response10 config:11 body: Hey, no n8n for you ${actions.ngrok.oauth.identity.name}!12 status_code: 400What’s happening here? This policy forces every request to log in with Google-provided OAuth.
If the Google account used to log in doesn’t end with @example.com (replace with your organization’s domain), ngrok rejects the request before it gets anywhere near your self-hosted AI.
You now have ngrok working as a gateway that 1) handles your public URL/domain, 2) routes traffic into your Docker containers, and 3) authenticates said traffic before it ever gets close to your local compute.
Side quest: Expose the Ollama API directly (and securely)
Let’s say you’re self-hosting this self-hosted AI stack on behalf of your organization, and one of your developers wants to hit the Ollama API directly instead of through n8n and some workflow.
The same process works here, too: Start a new endpoint, give it an ngrok URL (if you have another to spare), and add another policy to authenticate that API traffic before it hits your network.
Because it’s an API, which assumes curl and machine-to-machine (M2M) communication, OAuth isn’t going to cut work, but you can also choose from IP restrictions, JWT validation, or even a “secret” header value that you filter against with an expression, like "'averysecretvalue' in req.headers['x-super-secret-token']".
IP restrictions might require a little more maintenance over time if folks are traveling or have dynamic IPs, but they are infallible—just replace the IPs in allow with the ones you want to give access to the Ollama API.
1on_http_request:2 - actions:3 - type: restrict-ips4 config:5 enforce: true6 allow:7 - 1.1.1.1/328 - 1.2.3.4/32What’s next?
Of course, this leaves you with the task of still building out all your automations with n8n, Ollama, and whatever else you want to connect together. Here are some things you might consider:
- Replace Cursor-generated AI overviews of PRs with ones generated by your LLM.
- Create a custom chatbot based on internal documentation in Notion or elsewhere.
- Give developers an AI coding agent to build with while also still keeping a tight hold of your data.
There’s also plenty more to dig into with ngrok within our Docker Desktop extension to make your gateway even more production-grade:
- Endpoint Pooling: If you have multiple Ollama containers across different servers or laptops, you can check the Endpoint Pooling toggle in ngrok’s Docker Desktop extension to automatically load balance between them. Just make sure you put them on the same public URL so your ngrok gateway knows what to do.
- More Traffic Policy for advanced gateways: If you have other self-hosted services you want to put behind a single gateway and URL+path combinations like
internal.example.com/n8nandinternal.example.com/something-else, consider the “front door” pattern or multiplexing. - Observability: Click the three dots in Docker Desktop and then View in Traffic Inspector to see real-time logs about all the requests and responses flowing through your system.
Wishing for a path on how to manage and use multiple models, whether running on Docker or in the cloud?
When we first published this post, we could only wink at what was coming. Now it’s live: ngrok.ai routes requests to hosted models and the ones you run yourself through one gateway URL. Sign up at app.ngrok.ai, use your $1 in credit to make your first requests, and read The new ngrok.ai for the full story.