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feature-request

Built in HTTP Health Check

Our containers are generally built with minimal dependencies so as to minimize the attack surface. This means they don't normally have curl/wget/netcat. There is a funky shell trick, but it's .... ugly. Would it be possible to add a cycle-native HTTP/HTTPS health check?

Ugly Script

exec 3<>/dev/tcp/localhost/5000 && \
  echo -e "GET /_ah HTTP/1.1\r\nHost: localhost\r\nConnection: close\r\n" >&3 && \
  cat <&3 | grep 200
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4

  • Hi Michael! Thanks for bringing this up. We've built but are continuing to expand our external monitoring service, but right now it only pings to check if a service is reachable. I can see us expanding this to include making http requests and looking for a 200 or something for availability, controlled from the portal/api.

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  • This would be for the container setup itself (is it ready? is it still working?)

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  • k8s implements a 'is it ready' for health_checks which is often important if running db migrations or other before the container is ready. If you hit a larger db and are migrating columns or other makes these pre-checks necessary.

    A general 'tcp/http' health check would be uber beneficial as many folks are probably just hacking it in as above. I'm a +1 for this feature suggestion.

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  • Thanks for the feedback everyone - as Chris mentioned we're going to be heavily expanding our monitoring/alerting offering over the next few months. I think this feature would slot nicely into that work. We'll keep everyone updated on what we end up doing here.

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