fopen fails with getaddrinfo failed

Question

I am having problems with the following code:

function http_file_exists($url){
$f=fopen($url,"r");
if($f){
    fclose($f);
    return true;
} else {
  return false;
}

} $url = "http://www.minhemmelighed.dk/Graphics/Products/55.jpg";

print http_file_exists($url);

The error it returns is:

Warning: fopen(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /srv/http/webshop3/image_scraper/test.php on line 6 Warning: fopen(http://www.minhemmelighed.dk/Graphics/Products/55.jpg): failed to open stream: php_network_getaddresses: getaddrinfo failed: Name or service not known in /srv/http/webshop3/image_scraper/test.php on line 6

What can I do about this? I have rebooted the server several times.

For the record:

I can access the website in question through a browser

I am running LAMP on Arch Linux

Answer 1

Rebooting a UNIX server is extremely unlikely to fix a problem. It looks like you need to check your nameserver configuration on the server. On the console of the web server (logged in as the php user, probably apache or www-data), test

dig www.minhemmelighed.dk

If this outputs an error message, check your /etc/resolv.conf. Comment out all lines and add

nameserver 8.8.8.8 # Google's public DNS server

If that solves the problem, contact the administrator of the original nameserver (or just use Google's 8.8.8.8). If it doesn't, check your connectivity and firewalls.