wget used by container health check does not respect 'no_proxy' environment variable.

[arusuki]

LRR Version and OS
LRRVersion: 0.9.21
OS: Synology DSM 7.1-42661
Installation method: Docker Container

Summary
The LRR container uses wget to check its health status, while the wget shipped with alpine image is from busybox which does not respect the no_proxy environment variable.

Therefore, when http_proxy and https_proxy environment variables are set, the wget command launched by docker health check uses proxy to access http://localhost:3000 and fails the test. The docker ps command therefore reports LRR container in unhealthy state which is false positive.

Possible Solutions

• add apk add wget to Dockerfile, which installs GNU wget which understands no_proxy, or
• add -Y off option to wget command to force busybox wget ignoring proxies when performing health check.

To Reproduce

When http_proxy and https_proxy environment variables are set, command docker ps shows the LRR container in unhealthy states.

CONTAINER ID   IMAGE                                 COMMAND                  CREATED          STATUS                      PORTS
3a9f9661f76d   difegue/lanraragi:latest              "//init"                 59 minutes ago   Up 23 minutes (unhealthy)   0.0.0.0:3000->3000/tcp                                    

To verify further, running command docker exec -it <LRR container ID> sh gives a shell in LRR container, then test the wget used by health check.

#inspect proxy settings
/home/koyomi/lanraragi # echo $http_proxy
http://172.28.0.1:7890
/home/koyomi/lanraragi # echo $https_proxy
http://172.28.0.1:7890
/home/koyomi/lanraragi # echo $no_proxy
localhost,127.0.0.1

#check health
/home/koyomi/lanraragi # wget --quiet --tries=1 --no-check-certificate --spider http://localhost:3000
wget: server returned error: HTTP/1.1 502 Bad Gateway

#Force wget to ignore proxy
/home/koyomi/lanraragi # wget --quiet --tries=1 --no-check-certificate --spider -Y off http://localhost:3000
/home/koyomi/lanraragi # echo $?
0

#install GNU wget
/home/koyomi/lanraragi # apk add wget
/home/koyomi/lanraragi # wget --quiet --tries=1 --no-check-certificate --spider http://localhost:3000
/home/koyomi/lanraragi # echo $?
0

[Difegue]

That makes sense to me. Thanks for the detailed explanation!

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