diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index 0b81dc0..1a95009 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -718,6 +718,22 @@ function drupal_settings_initialize() {
   }
   $is_https = isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on';
 
+  // Load environmental config, if present.
+  if (isset($_SERVER['DRUPAL_SETTINGS'])) {
+    $env_settings = json_decode($_SERVER['DRUPAL_SETTINGS'], TRUE);
+    foreach ($env_settings as $key => $value) {
+      // One level of depth should be enough for $conf and $database.
+      if ($key == 'conf') {
+        foreach($value as $conf_key => $conf_value) {
+          $conf[$conf_key] = $value;
+        }
+      }
+      else {
+        $$key = $value;
+      }
+    }
+  }
+
   if (isset($base_url)) {
     // Parse fixed base URL from settings.php.
     $parts = parse_url($base_url);