hi there,

I have searched through the Digital Ocean community for this problem that I am having and I was not able to resolve it.

I'm trying to point

app A -> siteA.com
dev app A -> dev.siteA.com

what is happening
dev app A -> dev.siteA.com
app A -> dev.siteA.com

here is my *zone file *

$ORIGIN siteA.com.
$TTL 1800
siteA.com. IN SOA ns1.digitalocean.com. hostmaster.siteA.com. 1460656377 10800 3600 604800 00000
siteA.com. 1800 IN NS ns1.digitalocean.com.
siteA.com. 1800 IN NS ns2.digitalocean.com.
siteA.com. 1800 IN NS ns3.digitalocean.com.
siteA.com. 1800 IN A 000.000.00.00
www.siteA.com. 1800 IN CNAME siteA.com.
siteA.com. 1800 IN MX 10 store1.test.net.
siteA.com. 1800 IN MX 0 smtp.test.net.
dev.siteA.com. 1800 IN CNAME siteA.com.

here is my Nginx setup for siteA

**server_tokens off; # for security-by-obscurity: stop displaying nginx version

map $http_upgrade $connection_upgrade {
        default upgrade;
        ''      close;
}

# HTTP
server {
        listen 80; # if this is not a default server, remove "default_server"
                location ~* "^/[a-z0-9]{40}\.(css|js)$" {
                        root /home/siteA/bundle/programs/web.browser;
                        access_log off;
                        expires max;
                }

        server_name siteA.com; .

                location / {
                        proxy_pass http://localhost:8080;
                        proxy_http_version 1.1;
                        proxy_set_header Upgrade $http_upgrade;
                        proxy_set_header Connection "upgrade";
                        proxy_set_header Host $host;
                }
}

here is my Nginx setup for dev.siteA

# this section is needed to proxy web-socket connections
map $http_upgrade $connection_upgrade {
        default upgrade;
        ''      close;
}

# HTTP
server {
        listen 80; # if this is not a default server, remove "default_server"
        server_name dev.siteA.com; 


location / {
        proxy_pass http://127.0.0.1:8080;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade; # allow websockets
        proxy_set_header Connection $connection_upgrade;
        proxy_set_header X-Forwarded-For $remote_addr; # preserve client IP
        # the root path (/) MUST NOT be cached
        if ($uri != '/') {
            expires 30d;
        }
    }
}

thank you for reading ;)