Differences

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--- gen:enable_varnish [2024/04/02 03:21] – created kirtisingh
+++ gen:enable_varnish [2025/09/16 10:07] (current) – kirtisingh
@@ Line 32: / Line 32: @@
 Please put this IP w.r.t. any software/plugin which is managing varnish cache
-With WordPress you can easily use Varnish and enable auto-purging of content (when it changes), by using the [[https://wordpress.org/plugins/varnish-http-purge/|Proxy Cache Purge]] .After installing the plugin. kindly make sure that you that this plugin points to varnish server at 172.16.26.1
+With WordPress you can easily use Varnish and enable auto-purging of content (when it changes), by using the [[https://wordpress.org/plugins/varnish-http-purge/|Proxy Cache Purge]] .After installing the plugin. kindly make sure that you that this plugin points to varnish server at 172.16.26.1 .
+Now if the page you changed/added is also referred/shown on the home page, Proxy Cache Purge plugin might not flush the cache for the website root i.e. / . In order to have seemless cache purge for the root or / page, we advise that you append the following block of code to the functions.php file of your WordPress theme . If the functions.php file does not exist, please create one.
+<code php>
+/* action w.r.t. save post in order to flush / URL - start */
+function custom2_save_post_action($post_id, $post, $update){
+    if ( 'publish' !== $post->post_status ) {
+	return;
+    }
+    preg_match('#^(/home/[^/]+/[^/]+)#',__DIR__,$matches);
+    $vhost_dir=$matches[1];
+    $hosts=array();
+    $hosts[]=preg_replace('#^www\.#','',$_SERVER['HTTP_HOST']);
+    $hosts[]='www.'.preg_replace('#^www\.#','',$_SERVER['HTTP_HOST']);
+    for($i=0;$i<count($hosts);$i++){
+        $ch = curl_init();
+        curl_setopt($ch, CURLOPT_URL, 'http://172.16.26.1:6081/');
+        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PURGE");
+        curl_setopt($ch, CURLOPT_HTTPHEADER, array(
+            'Host: '.$hosts[$i]
+        ));
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+        $response = curl_exec($ch);
+        if (curl_errno($ch)) {
+            file_put_contents($vhost_dir.'/varnish_purge_via_php.log',date('Y-m-d H:i:s').' - '.$hosts[$i].' cURL error: ' . curl_error($ch)."\n",FILE_APPEND);
+        } else {
+            file_put_contents($vhost_dir.'/varnish_purge_via_php.log',date("Y-m-d H:i:s").' - '.$hosts[$i].' handled'."\n",FILE_APPEND);
+        }
+        curl_close($ch);
+    }
+}
+add_action( 'save_post', 'custom2_save_post_action', 10, 3 );
+/* action w.r.t. save post in order to flush / URL - end */
+</code>
 In some scenarios auto-purging of Varnish cache may not happen even after using the Proxy Cache Purge plugin. Then in that case Purge/Clear-cache can be used to clear the cache. To disable Varnish, simply choose the Disable option.