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lanrat
Asked: 2017-05-21 16:27:09 +0800 CST

nginx reverse proxy inside docker with proxy_redirect default

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I'm trying to run lets-chat inside docker behind nginx acting as a reverse proxy so that lets-chat will be accessible on /chat over HTTP.

In the past when using nginx as a reverse proxy inside of docker for another docker container I set resolver 127.0.0.11 valid=300s; so that nginx uses the docker DNS server and set proxy_pass as a variable so that the nginx container can start without needing the upstream web service to be ready. Example.

However, lets-chat seems to need proxy_redirect default; which the nginx configuration does not allow combined with a variable proxy_pass.

Does anyone know a way around this to get the desired effect? I've tried a few manual redirects with no luck. My relevant nginx config is below.

# use docker's nameserver for changing container IPs
resolver 127.0.0.11 valid=300s;
resolver_timeout 5s;

server {
    listen       80;
    server_name  localhost;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
    }

    location /chat/ {
        # I would like this part to work
        #set $chat_backend http://chat_server:8080/;
        #proxy_pass $chat_backend;

        # But I can only get it to work like this
        proxy_pass http://chat_server:8080/;
        proxy_redirect /  /chat/;
        proxy_redirect default; # this line errors when setting a variable to proxy_pass

        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
    }
}

Thanks.

nginx

1 Answers

  1. From the manual, the following statements are equivalent:

    location /chat/ {
    proxy_pass http://chat_server:8080/;
    proxy_redirect default;
}
location /chat/ {
    proxy_pass http://chat_server:8080/;
    proxy_redirect http://chat_server:8080/ /chat/;
}

    proxy_redirect default does not work if the value of proxy_pass is not a literal string, however, proxy_redirect itself can also be constructed from variables.

    So this solution may work for you:

    location /chat/ {
    set $chat_backend http://chat_server:8080/;
    proxy_pass $chat_backend;

    proxy_redirect /             /chat/;
    proxy_redirect $chat_backend /chat/;
    ...
}
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