Complement test image: capture logs from nginx

[richvdh]

Have nginx send its logs to stderr/out, so that we can debug #13334.

[DMRobertson]

Many thanks! (Sorry, I kicked off the conversation in the complement room and then completely forgot about it.)

[richvdh]

Many thanks! (Sorry, I kicked off the conversation in the complement room and then completely forgot about it.)

Thanks for the review, but it didn't work :/. Hopefully this time round will be better.

[DMRobertson]

What went wrong? I guess stdout/stderr that nginx sees isn't the stdout/err of configure_workers_and_start.py, and it's the latter which forms the docker logging output?

[richvdh]

What went wrong? I guess stdout/stderr that nginx sees isn't the stdout/err of configure_workers_and_start.py, and it's the latter which forms the docker logging output?

It was malformed nginx config. Turns out docker/conf-workers/nginx.conf.j2 doesn't end up as top-level nginx config; rather it is included into the top-level config under the http section.

According to the lazyweb, the symlink hack is what the nginx docker container does.

[richvdh]

I guess stdout/stderr that nginx sees isn't the stdout/err of configure_workers_and_start.py, and it's the latter which forms the docker logging output?

That wasn't the problem. configure_workers_and_start replaces itself with supervisord, which is configured to pipe the stdout of its nginx to its own stdout, so that bit does work.

[DMRobertson]

Thanks for explaining. SGTM, let's try it!