How to user hot-restarter.py

[jfc...@gmail.com]

Hi!

I'm trying to use this python script on the repo: https://github.com/envoyproxy/envoy/blob/master/restarter/hot-restarter.py to test how would the restarting process would work. As a test environment I'm using a docker-compose file, based on this docker-compose file: https://github.com/envoyproxy/envoy/blob/master/examples/front-proxy/docker-compose.yml. I've tried changing the envoy command to the following

command: /usr/local/bin/hot-restart.py /usr/local/bin/start_envoy.sh

The issue is that it starts perfecly but when I send a SIGHUP signal  (Following this link: https://www.envoyproxy.io/docs/envoy/latest/operations/hot_restarter) the process exits because envoy didn't start correctly.

I don't know if it's because my laptop is running windows, Should I open an issue? 

This is the output of the logs I'm seing (I don't see much difference by changing the level to trace) 

envoy_1   | [2018-03-17 13:24:16.315][5][info][main] source/server/server.cc:178] initializing epoch 0 (hot restart version=9.200.16384.127.options=capacity=16384, num_slots=8209 hash=228984379728933363)

envoy_1   | [2018-03-17 13:24:16.322][5][info][config] source/server/configuration_impl.cc:52] loading 1 listener(s)

envoy_1   | [2018-03-17 13:24:16.323][5][info][config] source/server/configuration_impl.cc:92] loading tracing configuration

envoy_1   | [2018-03-17 13:24:16.323][5][info][config] source/server/configuration_impl.cc:119] loading stats sink configuration

envoy_1   | [2018-03-17 13:24:16.324][5][info][main] source/server/server.cc:353] starting main dispatch loop

envoy_1   | [2018-03-17 13:24:16.326][5][info][upstream] source/common/upstream/cluster_manager_impl.cc:131] cm init: all clusters initialized

envoy_1   | [2018-03-17 13:24:16.326][5][info][main] source/server/server.cc:337] all clusters initialized. initializing init manager

envoy_1   | [2018-03-17 13:24:16.326][5][info][config] source/server/listener_manager_impl.cc:583] all dependencies initialized. starting workers

envoy_1   | starting hot-restarter with target: /usr/local/bin/start_envoy.sh

envoy_1   | forking and execing new child process at epoch 0

envoy_1   | forked new child process with PID=5

envoy_1   | got SIGHUP

envoy_1   | forking and execing new child process at epoch 1

envoy_1   | forked new child process with PID=18

envoy_1   | got SIGCHLD

envoy_1   | PID=18 exited with code=1

envoy_1   | Due to abnormal exit, force killing all child processes and exiting

envoy_1   | force killing PID=5

envoy_1   | exiting due to lack of child processes

envoytest_envoy_1 exited with code 1

Anything I'm missing? 

Thanks!

[Stephan Zuercher]

I think it's worth creating an issue. I think more people will see it. Also seems to me that it might turn into a ticket for better docs around this.

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[Joaquin Fernandez Campo]

Yeah, I managed to fix the issue, it was because I wasn't passing the --restart-epoch flag. Docs could be improved in general, my impression is that it's hard to get a full picture from them. 

I've been setting up this repo: https://github.com/xocasdashdash/envoy-example as a full config example/learning exercise.

Regards,
Joaquín

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Joaquín Fernández Campo
E-Mail: jfc...@gmail.com

[Matt Klein]

Would really appreciate doc PRs to clarify things that confused you.

Thanks,

Matt

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Matt Klein

Software Engineer

mkl...@lyft.com

https://calendly.com/mattklein123