nginx: configuration file /etc/nginx/nginx.conf test failed (host not found in upstream)

Question

I have a vagrant box that has been working fine for sometime and today for some reason I get the following when I attemp to restart nginx.

nginx: [emerg] host not found in upstream "www.myclass.com.192.168.33.10.xip.io" in /etc/nginx/conf.d/myclass.com.conf:19 nginx: configuration file /etc/nginx/nginx.conf test failed 

I've not changed anything myself as far as I know of (unless Windows Update has done something strange)

Can anyone suggest how to get nginx working again & allowing me to restart the nginx service - it would appear I cannot ping the host... any ideas why?

Here is my nginx conf file: nginx conf file

--Update-- Run the following to check what is on port 80.. (having read another similar post) and I can see that the varnish daemon is on port 80.. is this cause of the problem?? Any advice would be welcomed as I'm new to this stuff

sudo netstat -tlnp | grep 80 

My myclass.com.conf file

server { listen              80; server_name         class.com.* www.class.com.*;  root /vagrant/www.class.com/public_html; index index.php;  access_log /vagrant/log/class.com.access.log; error_log  /vagrant/log/class.com.error.log error;  charset utf-8;  location = /favicon.ico { log_not_found off; access_log off; } location = /robots.txt  { access_log off; log_not_found off; }  error_page 404 /index.php;  location /socket.io {     proxy_pass http://www.class.com.192.168.33.10.xip.io:8055;     proxy_set_header Upgrade $http_upgrade;     proxy_set_header Connection "upgrade";     proxy_http_version 1.1; }  location / {     try_files       $uri $uri/ @handler;     expires         30d; }  location  /. {     return 404; }  location @handler {     rewrite / /index.php last; }  location ~ .php/ {     rewrite ^(.*.php)/ $1 last; }  location ~ \.php$ {     try_files                       $uri =404;      expires                         off;      fastcgi_read_timeout            900;     fastcgi_index                   index.php;     fastcgi_pass                    127.0.0.1:9000;     fastcgi_param                   SCRIPT_FILENAME $document_root$fastcgi_script_name;     fastcgi_param                   CLASS_ENVIRONMENT LYLE;     include                         /etc/nginx/fastcgi_params; }  gzip            on; gzip_min_length 1000; gzip_proxied    any; gzip_types      text/plain application/xml text/css text/js application/x-javascript;  sendfile        off; 

}

Answer 1

All you need is to put resolver that can resolve such domain name:

resolver                  8.8.8.8 valid=300s; resolver_timeout          10s; 

Google DNS (8.8.8.8) can resolve it, but it resolves to internal address belongs to network class C.

$ dig @8.8.8.8 www.class.com.192.168.33.10.xip.io ;; ANSWER SECTION: www.class.com.192.168.33.10.xip.io. 299 IN A    192.168.33.10