Bind() to 0.0.0.0:80 failed (98: Address already in use)

The standalone KoBo toolbox installation becomes semi-functional from time to time - data downloads stop working amongst other things, although users can login and do basic actions.

By inspecting logs, here is the line from log/nginx/error.log that marks the onset of the problem:

error.log:2019/10/30 06:28:24 [crit] 20#20: the changing binary signal is ignored: you should shutdown or terminate before either old or new binary's process

Then it continues down the log:

2019/10/30 06:28:35 [emerg] 1128#1128: bind() to 0.0.0.0:80 failed (98: Address already in use)
2019/10/30 06:28:35 [emerg] 1128#1128: bind() to [::]:80 failed (98: Address already in use)
2019/10/30 06:28:35 [emerg] 1128#1128: bind() to 0.0.0.0:80 failed (98: Address already in use)
2019/10/30 06:28:35 [emerg] 1128#1128: bind() to [::]:80 failed (98: Address already in use)
2019/10/30 06:28:35 [emerg] 1128#1128: bind() to 0.0.0.0:80 failed (98: Address already in use)
2019/10/30 06:28:35 [emerg] 1128#1128: bind() to [::]:80 failed (98: Address already in use)
2019/10/30 06:28:35 [emerg] 1128#1128: bind() to 0.0.0.0:80 failed (98: Address already in use)
2019/10/30 06:28:35 [emerg] 1128#1128: bind() to [::]:80 failed (98: Address already in use)
2019/10/30 06:28:35 [emerg] 1128#1128: bind() to 0.0.0.0:80 failed (98: Address already in use)
2019/10/30 06:28:35 [emerg] 1128#1128: bind() to [::]:80 failed (98: Address already in use)
2019/10/30 06:28:35 [emerg] 1128#1128: still could not bind()

After the docker-compose restart, the situation is back to normal.

The installation of the system was done with kobo-install, and the versions of images are:

mongo                                      3.4                           0a998023eb2d        3 months ago        427MB
kobotoolbox/nginx                          latest                        0b73b2eaea00        4 months ago        641MB
kobotoolbox/enketo-express-extra-widgets   1.77.0-jnm-grunt-workaround   ab42c120b286        4 months ago        1.59GB
kobotoolbox/kpi                            2.019.23                      aa9cd9bc7b21        4 months ago        1.51GB
kobotoolbox/kobocat                        2.019.22                      b4c8c3e6f89c        4 months ago        1.48GB
nginx                                      1.15-alpine                   dd025cdfe837        5 months ago        16.1MB
certbot/certbot                            latest                        4bdc1514009b        6 months ago        113MB
mdillon/postgis                            9.5                           a9a97c2d2458        7 months ago        622MB
redis                                      3.2                           87856cc39862        12 months ago       76MB

How can we correct this problem?

Thanks,

Hi @maric.vladimir,
bind() to 0.0.0.0:80 failed is a known bug that would be fixed a future release.
You need to enter the nginx container.

$kobo-install> ./run.py -cf exec nginx bash
$root> sv stop nginx

Thank you @nolive