examples/front-proxy tutorial is broken

[ahmetb]

I'm using Docker for Mac and for some reason the example proxy in examples/front-proxy cannot bind to 0.0.0.0:80 inside the container.

front-envoy_1  | [2020-06-08 21:04:27.772][7][critical][main] [source/server/server.cc:100] error initializing configuration '/etc/front-envoy.yaml': cannot bind '0.0.0.0:80': Permission denied

docker run --rm -p 80:80 nginx works fine.

So it makes me think something’s wrong with the docker-compose config. I unfortunately don't know enough to contribute.

[dio]

Hum, I think all examples that bound to 80 (and other privileged ports) need to be updated since #11323

Meanwhile:

    environment:
      - "ENVOY_UID=0"

[ahmetkotan]

CMD command runs with envoy user because of this configuration. I tried adding to USER root to Dockerfile and user: root to docker-compose.yaml, but it didn't work because of this entrypoint.

If you are add to ENVOY_UID=0 to environment, you can run as root. Also see,

envoy/ci/docker-entrypoint.sh

Line 25 in e8a2d1e

exec "${@}"

[phlax]

CMD command runs with envoy user because of this configuration.

its the entrypoint which changes the user.

@mattklein123 would you like me to PR to update the examples that expose 80 ?

[mattklein123]

Sure any fixes to improve the examples appreciated.