Nginx的IPv6的配置文檔

Question

我的網絡服務器（主機nginx的Facebook應用）開始接收錯誤說

*907768 FastCGI sent in stderr: "Invalid IPv6 configuration on server, Please disable or get native IPv6 on your server" while reading response header from upstream, client:... 

可能是什麼這個錯誤的原因是什麼？我並不總是這樣。

Answer 1

錯誤來自於php代碼，更具體地說 - facebook sdk。當Facebook的代碼會嘗試連接到IPv6地址，並不能達到網絡它拋出，很可能是由於IPv6的系統啓用，但沒有IPv6連接（引自base_facebook.php）：

// With dual stacked DNS responses, it's possible for a server to 
// have IPv6 enabled but not have IPv6 connectivity. If this is 
// the case, curl will try IPv4 first and if that fails, then it will 
// fall back to IPv6 and the error EHOSTUNREACH is returned by the 
// operating system. 
if ($result === false && empty($opts[CURLOPT_IPRESOLVE])) { 
    $matches = array(); 
    $regex = '/Failed to connect to ([^:].*): Network is unreachable/'; 
    if (preg_match($regex, curl_error($ch), $matches)) { 
     if (strlen(@inet_pton($matches[1])) === 16) { 
     self::errorLog('Invalid IPv6 configuration on server, '. 
         'Please disable or get native IPv6 on your server.'); 
     self::$CURL_OPTS[CURLOPT_IPRESOLVE] = CURL_IPRESOLVE_V4; 
     curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4); 
     $result = curl_exec($ch); 
     } 
    } 
} 

正確的方式來處理這個問題將要麼禁用系統中的ipv6，要麼獲得一些ipv6連接。另外，它應該可以通過詢問Facebook的代碼總是被什麼東西在你的代碼中使用的IPv4這樣來取消錯誤：

Facebook::$CURL_OPTS[CURLOPT_IPRESOLVE] = CURL_IPRESOLVE_V4;