Built-in Docker Healthcheck

[Mads Jon Nielsen]

Describe the feature you'd like
I would like the docker image to contain curl or wget so it's possible to create a docker healthcheck that docker-compose or docker swarm can use.

It would be nice the healthchecking is just native to the cloudflare/cloudflared image like so.

FROM cloudflare/cloudflared:2023.10.0 as cloudflared
FROM alpine:3.18.4

COPY --from=cloudflared /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
COPY --from=cloudflared /usr/local/bin/cloudflared /usr/local/bin

ENV TUNNEL_METRICS="localhost:2000"

HEALTHCHECK --interval=5s --retries=6 --timeout=3s CMD wget -q ${TUNNEL_METRICS}/ready -O -

If building from alpine is something you don't want to do, then provide a cloudflare tunnel health command that can be used like so

HEALTHCHECK --interval=5s --retries=6 --timeout=3s CMD cloudflare tunnel health --ready-endpoint localhost:2000/ready

or like so

services:
  cloudflared:
    image: cloudflare/cloudflared
    environment:
      TUNNEL_METRICS: "localhost:2000"
    healthcheck:
      command: cloudflared tunnel health --ready-endpoint ${TUNNEL_METRICS}/ready
      interval: 5s
      retries: 6
      timeout: 3s

Describe alternatives you've considered
Build my own image built on-top of the cloudflare/cloudflared image or use third-party images built on top of cloudflare's

[mordilloSan]

I second this. Would be very helpful when using auto heal.

[Alex Stephan]

Using the following Dockerfile could be working:

FROM tarampampam/curl as curl

FROM erisamoe/cloudflared
COPY --from=curl /bin/curl /bin/

Credits:
https://github.com/sidevesh/cloudflared-with-health-check