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https://github.com/thib8956/nginx-proxy
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60 lines
3.2 KiB
Markdown
60 lines
3.2 KiB
Markdown
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# nginx-proxy template is not considered when a container is not reachable
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Having a container with the `VIRTUAL_HOST` environment variable set but on a network not reachable from the nginx-proxy container will result in nginx-proxy serving the default nginx welcome page for all requests.
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Furthermore, if the nginx-proxy in such state is restarted, the nginx process will crash and the container stops.
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In the generated nginx config file, we can notice the presence of an empty `upstream {}` block.
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This can be fixed by merging [PR-585](https://github.com/jwilder/nginx-proxy/pull/585).
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## How to reproduce
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1. a first web container is created on network `netA`
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1. a second web container is created on network `netB`
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1. nginx-proxy is created with access to `netA` only
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## Erratic behavior
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- nginx serves the default welcome page for all requests to `/` and error 404 for any other path
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- nginx-container crash on restart
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Log shows:
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```
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webB_1 | starting a web server listening on port 82
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webA_1 | starting a web server listening on port 81
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reverseproxy | forego | starting dockergen.1 on port 5000
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reverseproxy | forego | starting nginx.1 on port 5100
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reverseproxy | dockergen.1 | 2017/02/20 01:10:24 Generated '/etc/nginx/conf.d/default.conf' from 3 containers
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reverseproxy | dockergen.1 | 2017/02/20 01:10:24 Running 'nginx -s reload'
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reverseproxy | dockergen.1 | 2017/02/20 01:10:24 Error running notify command: nginx -s reload, exit status 1
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reverseproxy | dockergen.1 | 2017/02/20 01:10:24 Watching docker events
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reverseproxy | dockergen.1 | 2017/02/20 01:10:24 Contents of /etc/nginx/conf.d/default.conf did not change. Skipping notification 'nginx -s reload'
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reverseproxy | reverseproxy | forego | starting dockergen.1 on port 5000 <---- nginx-proxy container restarted
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reverseproxy | forego | starting nginx.1 on port 5100
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reverseproxy | dockergen.1 | 2017/02/20 01:10:24 Generated '/etc/nginx/conf.d/default.conf' from 3 containers
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reverseproxy | dockergen.1 | 2017/02/20 01:10:24 Running 'nginx -s reload'
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reverseproxy | dockergen.1 | 2017/02/20 01:10:24 Error running notify command: nginx -s reload, exit status 1
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reverseproxy | dockergen.1 | 2017/02/20 01:10:24 Watching docker events
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reverseproxy | dockergen.1 | 2017/02/20 01:10:24 Contents of /etc/nginx/conf.d/default.conf did not change. Skipping notification 'nginx -s reload'
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reverseproxy | forego | starting dockergen.1 on port 5000
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reverseproxy | forego | starting nginx.1 on port 5100
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reverseproxy | nginx.1 | 2017/02/20 01:11:02 [emerg] 17#17: no servers are inside upstream in /etc/nginx/conf.d/default.conf:64
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reverseproxy | forego | starting nginx.1 on port 5200
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reverseproxy | forego | sending SIGTERM to nginx.1
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reverseproxy | forego | sending SIGTERM to dockergen.1
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reverseproxy exited with code 0
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reverseproxy exited with code 0
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```
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## Expected behavior
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- no default nginx welcome page should be served
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- nginx is able to forward requests to containers of `netA`
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- nginx respond with error 503 for unknown virtual hosts
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- nginx is not able to forward requests to containers of `netB` and responds with an error
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- nginx should survive restarts
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