nginx proxy_pass to a linked docker container

问题

I have two docker containers with nginx. container1 is linked to container2. Docker then adds an entry to /etc/hosts which I entered into the nginx configuration like so:

server {
    location ~ ^/some_url/(.*)$ {
        proxy_pass http://container1/$1;
    }
}

I can ping container1 from container2, but nginx cannot resolve it:

*1 no resolver defined to resolve container1

How can I proxy_pass a request to another docker container?

回答1:

Use an upstream block instead of the container name directly

upstream backend {
    server container1;
}
server {
    location ~ ^/some_url/(.*)$ {
        proxy_pass http://backend/$1;
    }
}

This should allow normal name resolution to occur providing a way to easily use docker links with nginx.

回答2:

You could use embedded Docker DNS service, if enabled, check your container resolver:

cat /etc/resolv.conf

Should be:

nameserver 127.0.0.11

Use this IP as resolver:

server {
    location ~ ^/some_url/(.*)$ {
        resolver 127.0.0.11;
        proxy_pass http://container1/$1;
    } }

回答3:

You should take a look at this answer about using /etc/hosts as your resolver: Using /etc/hosts as resolver for url rewriting

Basically, your dns or resolver does not use /etc/hosts to resolve names during a lookup, but you can work around this by installing dnsmasq and using 127.0.0.1 as your resolver. You can add 127.0.0.1 as the resolver directly in your nginx config:

server {
    location ~ ^/some_url/(.*)$ {
        resolver 127.0.0.1;
        proxy_pass http://container1/$1;
    }
}

来源：https://stackoverflow.com/questions/28028789/nginx-proxy-pass-to-a-linked-docker-container

标签

nginx

Docker

reverse-proxy