Error when start kafka-topics-ui container: Interrupted system call about kafka-topics-ui

[Arttii]

So the way of solving this, is to omit

ADD Caddyfile /caddy/

, and instead write it out fully in the run.sh. I have no idea why this is happening, but thats' the only way I could get it to work.

I was facing this problem, when running this in Kubernetes on a Debian OS.

[Overbryd]

Seems to work just fine 👍

$ kubectl -n kafka logs kafka-tools-1648884374-7f3jf topics-ui
Enabling proxy.
Kafka REST Proxy URL to /api/kafka-rest-proxy.

Activating privacy features... done.
http://0.0.0.0:8000

[andmarios]

Hello, thanks for the report.

Your docker-compose file looks fine. I think that both the line and the error message point to a docker issue.

The problematic line is pretty much standard bash: https://github.com/Landoop/kafka-topics-ui/blob/master/docker/run.sh#L16

The error message (interrupted system call) doesn't come from bash but from docker itself, probably from some of the standard go libraries docker is using.

I don't know if this is something rancher specific, if you use bash on windows (a quick search seems to return this as a possible culprit), or something else.

Could you share more about your setup, like your operating system and how you access rancher? Maybe I can do some tests.

[akking]

Thank you so much for your prompt response. We are running Rancher on Rancher OSs on a cluster of machines.

I tried to narrow the problem by reproducing the problem but the error happens like randomly under same docker-compose file.

[andmarios]

I am afraid I can't help much because I can't reproduce the bug and I haven't any experience with RancherOS —nor the time to familiarize with it, unfortunately. :(

Looking a bit into rancher-compose (I guess this is what you use? ), there is a debug flag that may help you:
http://docs.rancher.com/rancher/v1.6/en/cattle/rancher-compose/

[OneCricketeer]

Also seeing this on MacOS

docker run --rm -it -p 8082:8000  -e "KAFKA_REST_PROXY_URL=http://kafka-rest-proxy:8082"  -e "PROXY=true" landoop/kafka-topics-ui
Enabling proxy.
/run.sh: line 23: can't create /caddy/Caddyfile: Interrupted system call
Kafka REST Proxy URL to /api/kafka-rest-proxy.

Activating privacy features... done.
http://0.0.0.0:8000

[akking]

What's weird is that the error comes from line 23, at the fi block. If it can't create the file, why it doesn't happen at line 21 EOF? Why cat not closing the file at EOF line?

Sorry, I didn't mean to close the issue. My mistake.

[Antwnis]

Is it possible that docker runs out of disk space?

[andmarios]

Thanks @Arttii for following up on this. Indeed, this seems a complex issue and I never managed to reproduce it in order to debug. I will implement your workaround, thanks again!

[Overbryd]

I am facing the same problem here, running on a GCE based Kubernetes cluster.

kubectl -n kafka logs -f deploy/kafka-tools topics-ui
Enabling proxy.
/run.sh: line 53: can't create /caddy/Caddyfile: Interrupted system call
Kafka REST Proxy URL to /api/kafka-rest-proxy.

Activating privacy features... done.
http://0.0.0.0:8000

[andmarios]

I just pushed a possible fix with commit 762792a.
Could you please pull the latest image (docker pull landoop/kafka-topics-ui:latest) and give it a try?

[Antwnis]

Thats this helps a lot. We can apply the same fix on our other dockers as well, to make sure no such glitches come up 👍

[andmarios]

Thanks both @Arttii and @Overbryd and to all people who contributed on this issue. We couldn't have solved it without you!