How to run dat inside kubernetes

[dwiel]

Is anyone successfully running dat from inside kubernetes? The following Deployment is currently working for me, but it would be nice to avoid requiring hostNetwork: true. Also wondering how to best specify the .dat keys. I am currently sharing them from the host which works all right in this scenario, but isn't a very general solution. Also, the node this container is running on essentially has a public ip which might be making this easier. I haven't yet tested it from inside kubernetes on a node without a public ip.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: dat-server
  labels:
    app: dat-server
spec:
  replicas: 1
  selector:
    matchLabels:
      app: dat-server
  template:
    metadata:
      labels:
        app: dat-server
    spec:
      volumes:
        - name: nfs
          hostPath:
            path: /mnt/nfs
            type: Directory
        - name: dat-key
          hostPath:
            path: /root/.dat
            type: Directory
        # kubernetes secrets can't have subdirectories so this doesn't work
        # - name: dat-key
        #   secret:
        #     secretName: dat-key
      containers:
      - name: dat-server
        image: registry/dat:latest
        command:
          - "dat"
          - "share"
          - "/mnt/nfs/"
          # - "sleep"
          # - "300"
        volumeMounts:
          - name: nfs
            mountPath: /mnt/nfs
          - name: dat-key
            mountPath: /root/.dat
      # this gets dat network access, otherwise i get symmetric nat errors from dat doctor
      hostNetwork: true
      # sort of a hack, run this only on the node running the nfs server
      nodeSelector:
        nfs: server
# ---
# # I was still unable to access dat with this service
# kind: Service
# apiVersion: v1
# metadata:
#   name: dat-server
# spec:
#   type: NodePort
#   selector:
#     app: dat-server
#   ports:
#   - name: dat-tcp
#     protocol: TCP
#     nodePort: 30282
#     port: 30282
#     targetPort: 30282
#   - name: dat-udp
#     protocol: UDP
#     nodePort: 30282
#     port: 30282
#     targetPort: 30282

[RangerMauve]

I think @ninabreznik and @jam10o were messing around with getting it to work in docker. I'd assume that it'll be hard to get incoming connections to work (or the DHT?), but I don't have hands on experience with it myself.

[dwiel]

Thanks, btw I've tested the above solution on nodes that dont have public ips with success. Would still like avoid hostNetwork: true, but it is running. I've also had it working in docker with udp and TCP ports opened as well.

[ninabreznik]

@dwiel that's great. Can you share your dockerfile to see your configuration and hopefully make it run too?

Thanks @RangerMauve for a ping!

[dwiel]

The dockerfile is very simple:

FROM node:11

# https://stackoverflow.com/a/45505787/2093984
RUN npm -g config set user root

RUN npm cache clean --force

RUN npm install -g dat

[dwiel]

From another thread here i got the flags for running inside of docker (not kubernetes): -p 3282:3282/udp -p 3282:3282/tcp

[ninabreznik]

Thanks, @dwie. I actually tried this but it somehow doesn't work. Maybe I am missing something else here, but if you want to check my repo that I containerize and run on Digital Ocean, please check it out and if you have any comment/suggestion, please let me know https://github.com/ninabreznik/ethplay

[dwiel]

It looks like you are missing udp port 3282. You have to open udp ports independently from tcp ports.

[ninabreznik]

It looks like you are missing udp port 3282. You have to open udp ports independently from tcp ports.

Like this? https://github.com/ninabreznik/ethplay/blob/master/Dockerfile

I tried this and then ran it on Digital Ocean with a command -p 3282:3282/tcp -p 3282:3282/udp but sadly still nothing :/

[dwiel]

Hmm, that looks right. Have you tried running dat doctor from inside the container? That helped me debug my setup.

[ninabreznik]

The problem is I am running a hypertrie and afaik dat doctor doesn't work with the hypertrie, so I am not sure how to debug this...

On Thu, Oct 31, 2019 at 11:29 AM Zach Dwiel [email protected] wrote:

Hmm, that looks right. Have you tried running dat doctor from inside the container? That helped me debug my setup.

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[dpaez]

This is interesting. @ninabreznik you can try add DEBUG=discovery-swarm-web-server to your npm discovery script, so it would be something like this:

"scripts": {
  "start": "node app.js",
  "discovery": "DEBUG=discovery-swarm-web-server discovery-swarm-web"
}

If everything is starting OK, the debug should output any connection error. Maybe that could help to debug.

[ninabreznik]

@dpaez That's cool, thanks. Now, I see that there is another problem. And that's the fact that discovery-swarm-web doesn't support hypertrie... Any idea how to fix this? Or how to use hyperswarm in the browser?

[dpaez]

@ninabreznik I haven't used hypertrie directly nor in the browser yet. But I give it a look to the discovery-swarm-web dependencies and seems like hyperdiscovery needs an update to be compatible with the latest hypercore-protocol used by hypertrie. Withouth that discovery-swarm-web wont work with hypertries directly. That's my guess.

[ninabreznik]

Thanks @dpaez, looks like something @RangerMauve mentioned too. He'll try to help out and we'll see what needs to be done and how to fix it :)

Thanks a lot for helping out. Will share my findings once I make it work :dancing_women: