I've been trying to wrap my head around the whole self-hosted vs vendor-hosted thing, especially for running agents. The big vendors are convenient, but I keep thinking... where does my data actually go?
So I decided to try self-hosting the agent images themselves. I'm using Docker's registry image, which seemed like the simplest start. I spun up a VM on my home server and ran this:
docker run -d -p 5000:5000 --name registry registry:2
Now I can push my own built images there. But I'm already hitting questions:
* How do I secure this? It's wide open right now.
* Should I add authentication? HTTPS?
* Is this even the right approach, or am I just making a fancy but useless repo?
I'm looking for a "good enough for a small project" setup, not Fort Knox. What are the basic steps everyone does after the basic container is running? I'm worried about messing up the security and exposing my whole setup 😬
That's the right starting point. For a small project, you need at least HTTPS and basic auth. A registry without TLS is effectively a broadcast of your image layers and tags. You can use a reverse proxy like nginx or Caddy in front of your registry container to handle both.
Your immediate next steps should be:
* Generate a self-signed cert or use Let's Encrypt for the proxy.
* Configure HTTP basic auth with `htpasswd`.
* Set the registry to require the auth via `REGISTRY_AUTH` environment variable or proxy configuration.
But you're missing the critical piece: how do you know the image you pull tomorrow is the same one you pushed today? A private registry doesn't solve integrity by itself. You should be signing your agent images with something like Cosign and storing the signatures alongside them. Otherwise, you've just traded a vendor's control for your own unverified blob storage.
-Yuki
Yeah, HTTPS and basic auth sound like a good next step. The whole signing thing with Cosign is new to me though. Is that something you'd add right away, or is it more for later when things get more serious?
I got a bit scared reading "broadcast of your image layers" - my little home server is suddenly feeling very exposed 😅. Thanks for the push!
Learning by doing (and breaking).
Yeah, the basic auth + HTTPS is a solid next step and keeps it manageable. I'm curious about the Cosign part you mentioned.
> how do you know the image you pull tomorrow is the same one you pushed today?
That's a good point I hadn't considered at all. For a beginner just trying to get a private registry off the ground, is image signing realistically step two, or is it more like step five? It sounds like another whole layer of complexity to learn and manage. I'm trying to avoid making my simple agent project collapse under the weight of its own infrastructure.
Better safe than sorry.
Hey user221, totally get where you're coming from - that "where does my data go" feeling is exactly why I went down this path too.
You're on the right track with the basic registry, but yeah, that wide-open feeling is real. The basic steps I'd take after getting the container running are exactly what user102 said: HTTPS and basic auth are non-negotiable, even for a small project. A reverse proxy like Caddy makes the HTTPS part stupid easy with Let's Encrypt, honestly. The broadcast line is scary but true - every layer you push is just... out there.
Where I'd add a thought, since you're asking about it being "fancy but useless": the registry itself isn't useless, but its value is limited without some integrity checking. Once you have HTTPS and auth squared away, I'd look at signing your images with something like Cosign pretty soon after. It sounds like a step five thing, but it's more like step 2.5 for me. It's the difference between having a locked drawer and having a locked drawer where you can actually verify nothing's been swapped out. You don't need the full Sigstore ceremony initially, just signing with a local key and pushing the signature to your new registry adds a huge confidence boost for very little ongoing overhead.
You're not making Fort Knox, but you're building a chain of trust, and each link (private repo, access control, verified content) matters. The good news is you can add these layers incrementally without redoing everything.
Trust no source without a signature.