Rajin Sharwar

This plugin makes sure that the LaunchWP page and object cache are cleared when your site’s content changes. Not yet a part of LaunchWP? <a href="https://launchwp.io/pricing/" rel="nofollow ugc">Sign up here.</a>
LaunchWP is a modern WordPress server control, designed to plug into any cloud provider to launch and manage WordPress sites without writing a single line of code or command.
This Helper plugin should be installed on websites powered by LaunchWP to allow the page and object cache to be cleared when your site’s content changes. Not yet a part of LaunchWP? <a href="https://launchwp.io/pricing/" rel="nofollow ugc">Sign up here.</a>
Launching a WordPress site on your very own VPS or Virtual Private Server at Linode, AWS, GCP, DigitalOcean, or in one of the thousands of cloud providers, is definitely the best option for you because you get a powerful server, and have your WordPress sites run blazing fast, have complete control of the server, that too without having to break the bank.
The problem is that setting up a VPS, installing packages required to run WordPress, setting up SFTP or PHPMyAdmin, securing your server ports, and then installing WordPress core is not an easy task in total, it’s a huge hassle and time-consuming even for experienced developers. You have to manage everything from doing security upgrades, managing server packages, upgrading them, configuring the webserver, Database server, PHP, MySQL, Caching, cURL, and a lot more. Not to mention that if you face any issues, you are on your own!
Solution? Connect your VPS with LaunchWP. LaunchWP is a WordPress-focused modern server management dashboard. LaunchWP gives you the speed your WordPress deserves, the security that you need, and features that you will love, all in your own server without running a single line of code or command. With LaunchWP, you can seamlessly launch your WordPress sites in any VPS or cloud provider, including DigitalOcean, Linode, Vultr, GCP, Hetzner, and a lot more.
Get all the features like being in a managed hosting, plus full control of your Website, because it’s your own server.
Manage all your WordPress sites and servers easily from one place. Easily change PHP versions, add custom Nginx and PHP config right from the UI, and access PHPMyAdmin and SFTP with ease. Get help where you need it, when you need it, from our team of expert Sys Admins and WordPress devs. Launch WordPress sites on your own server in minutes, not hours. You can also host your clients’ websites affordably and easily, adding precious recurring revenue to your agency or freelance business.
Any VPS or Cloud Provider
LaunchWP supports Linode, DigitalOcean, GCP, AWS, and any other VPS or cloud providers. If your server is SSH-able, and can have a fresh installed Ubuntu 24.04 LTS, you can connect it to LaunchWP.
Docker powered
LaunchWP powered websites are Docker Powered. This means that none of your websites will affect the other; on the same server, all your websites are isolated from one another.
One-Click Staging
Create STAGING websites on LaunchWP with a click. STAGING sites in LaunchWP come with a Free STAGING domain and a Free SSL so that you can debug your issues with freedom. Anytime, resync your LIVE and STAGING website with a few clicks.
Free SSL/TLS Certificates
Serving your site over HTTPS is a must these days, not only for security, but to take advantage of the performance improvements of HTTP/2 as well. When you add a site to LaunchWP, a free Letâ€™s Encrypt SSL/TLS certificate will be acquired, installed, and configured for your site. LaunchWP will handle certificate renewals as well, so you hardly need to think about certificates. (Unless you are using CloudFlare, in which case CloudFlare will manage for you)
Cache All the Things
LaunchWP websites are super performant, and our Stack is enterprise-tested. The secret of it is LaunchWP’s extensive multi-layer caching. LaunchWP has Object caching, Page Caching, and Proxy caching, requests to your static pages hardly do reach your origin. And no, those all are handled by LaunchWP without any additional plugin.
This Helper plugin is specifically for helping your flush cache whenever your content changes. This plugin won’t flush your full Redis cache; instead, it will only flush the cache of the components where the content was changed.
Unified and Secure SFTP Access
Easily access or share access to your website’s SFTP using SSH keys. You control who can access your SFTP and who can’t. And no, SFTP users cannot access anything in your server except your website’s files. 🙂
Auto-Scheduled Off-Server Backups
LaunchWP offers both manual on-demand and Auto-Scheduled off-server backups to storage providers like DigitalOcean Spaces, AWS S3, Linode Object Storage, CloudFlare R2, BackBlaze, Wasabi, and more. Set it up once, and forget it!
Support to Spoil You
LaunchWP support will actively point you in the right direction and offer suggestions for maintaining your server. It’s your website and data, stored on your server, and LaunchWP is your server guide!
For Teams
Invite your Team to manage your LaunchWP servers or sites. Access is granular, meaning you control what a user can manage. Share access to individual sites or all sites of a server, the choice is yours.
<h4>Features</h4>
<ul>
<li>Launching new sites on a VPS or cloud provider is as easy as submitting a form.</li>
<li>Multiple layers of page and server-level caching out of the box for a blazing fast loading speed, even without using any caching plugins.</li>
<li>Easily add unlimited SSH keys for SFTP access.</li>
<li>One-click access and IP restriction for PHPMyAdmin.</li>
<li>Full integration with Redis Object Cache and Object Cache Pro plugin</li>
<li>Ensures debug.log files arenâ€™t accessible publicly.</li>
<li>Protect website by Basic auth anytime with a click</li>
<li>Custom php.ini and NGINX config right from the dashboard.</li>
<li>Disable/Enable SSL with a click</li>
<li>Pre-configured Server-level WordPress Cron.</li>
<li>Persistent object caching</li>
<li>Restart services like Nginx, PHP, and Redis individually</li>
<li>Team access and User management.</li>
<li>One-click STAGING sites.</li>
<li>Scheduled and Manual off-server backups</li>
<li>Page cache purging</li>
</ul>

LaunchWP

LaunchWP is a WordPress-focused modern server management dashboard to help you install and launch WordPress on any VPS or cloud provider.

Automattic

Donncha O Caoimh (a11n)

Mike Stott

Nauris

Mark (a11n)

Pete (a11n)

Adnan Haque (a11n)

Peter Petrov

This plugin generates static html files from your dynamic WordPress blog. After a html file is generated your webserver will serve that file instead of processing the comparatively heavier and more expensive WordPress PHP scripts.
The static html files will be served to the vast majority of your users:
<ul>
<li>Users who are not logged in.</li>
<li>Users who have not left a comment on your blog.</li>
<li>Or users who have not viewed a password protected post.</li>
</ul>
99% of your visitors will be served static html files. One cached file can be served thousands of times. Other visitors will be served custom cached files tailored to their visit. If they are logged in, or have left comments those details will be displayed and cached for them.
The plugin serves cached files in 3 ways (ranked by speed):
<ol>
<li>Expert. The fastest method is by using Apache mod_rewrite (or whatever similar module your web server supports) to serve “supercached” static html files. This completely bypasses PHP and is extremely quick. If your server is hit by a deluge of traffic it is more likely to cope as the requests are “lighter”. This does require the Apache mod_rewrite module (which is probably installed if you have custom permalinks) and a modification of your .htaccess file which is risky and may take down your site if modified incorrectly.</li>
<li>Simple. Supercached static files can be served by PHP and this is the recommended way of using the plugin. The plugin will serve a “supercached” file if it exists and it’s almost as fast as the mod_rewrite method. It’s easier to configure as the .htaccess file doesn’t need to be changed. You still need a custom permalink. You can keep portions of your page dynamic in this caching mode.</li>
<li>WP-Cache caching. This is mainly used to cache pages for known users, URLs with parameters and feeds. Known users are logged in users, visitors who leave comments or those who should be shown custom per-user data. It’s the most flexible caching method and slightly slower. WP-Cache caching will also cache visits by unknown users if supercaching is disabled. You can have dynamic parts to your page in this mode too. This mode is always enabled but you can disable caching for known users, URLs with parameters, or feeds separately. Set the constant “DISABLE_SUPERCACHE” to 1 in your wp-config.php if you want to only use WP-Cache caching.</li>
</ol>
If you’re not comfortable with editing PHP files then use simple mode. It’s easy to set up and very fast.
<h3>Recommended Settings</h3>
<ol>
<li>Simple caching.</li>
<li>Compress pages.</li>
<li>Don’t cache pages for known users.</li>
<li>Cache rebuild.</li>
<li>CDN support.</li>
<li>Extra homepage checks.</li>
</ol>
Garbage collection is the act of cleaning up cache files that are out of date and stale. There’s no correct value for the expiry time but a good starting point is 1800 seconds.
Consider deleting the contents of the “Rejected User Agents” text box and allow search engines to cache files for you.
Preload as many posts as you can and enable “Preload Mode”. Garbage collection of old cached files will be disabled. If you don’t care about sidebar widgets updating often set the preload interval to 2880 minutes (2 days) so all your posts aren’t recached very often. When the preload occurs the cache files for the post being refreshed is deleted and then regenerated. Afterwards a garbage collection of all old files is performed to clean out stale cache files. 
Even with preload mode enabled cached files will still be deleted when posts are modified or comments made.
<h3>Development</h3>
<ul>
<li>Active development of this plugin is handled <a href="https://github.com/Automattic/wp-super-cache" rel="nofollow ugc">on GitHub</a>.</li>
<li>Translation of the plugin into different languages is on the <a href="https://translate.wordpress.org/projects/wp-plugins/wp-super-cache" rel="nofollow ugc">translation page</a>.</li>
</ul>
<h3>Documentation</h3>
If you need more information than the following, you can have a look at <a href="https://github.com/Automattic/wp-super-cache/wiki" rel="nofollow ugc">the wiki</a> or the <a href="https://odd.blog/wp-super-cache-developers/" rel="nofollow ugc">Developer documentation</a>.
<h4>Preloading</h4>
You can generate cached files for the posts, categories and tags of your site by preloading. Preloading will visit each page of your site generating a cached page as it goes along, just like any other visitor to the site. Due to the sequential nature of this function, it can take some time to preload a complete site if there are many posts. 
To make preloading more effective it can be useful to disable garbage collection so that older cache files are not deleted. This is done by enabling “Preload Mode” in the settings. Be aware however, that pages will go out of date eventually but that updates by submitting comments or editing posts will clear portions of the cache.
<h4>Garbage Collection</h4>
Your cache directory fills up over time, which takes up space on your server. If space is limited or billed by capacity, or if you worry that the cached pages of your site will go stale then garbage collection has to be done. Garbage collection happens on a regular basis and deletes old files in the cache directory. On the advanced settings page you can specify: 
1. Cache timeout. How long cache files are considered fresh for. After this time they are stale and can be deleted. 
2. Scheduler. Setup how often garbage collection should be done. 
3. Notification emails. You can be informed on garbage collection job progress. 
There’s no right or wrong settings for garbage collection. It depends on your own site. 
If your site gets regular updates, or comments then set the timeout to 1800 seconds, and set the timer to 600 seconds. 
If your site is mostly static you can disable garbage collection by entering 0 as the timeout, or use a really large timeout value.
The cache directory, usually wp-content/cache/ is only for temporary files. Do not ever put important files or symlinks to important files or directories in that directory. They will be deleted if the plugin has write access to them.
<h4>CDN</h4>
A Content Delivery Network (CDN) is usually a network of computers situated around the world that will serve the content of your website faster by using servers close to you. Static files like images, Javascript and CSS files can be served through these networks to speed up how fast your site loads. You can also create a “poor man’s CDN” by using a sub domain of your domain to serve static files too.
<a href="https://wordpress.org/plugins/ossdl-cdn-off-linker/" rel="ugc">OSSDL CDN off-linker</a> has been integrated into WP Super Cache to provide basic CDN support. It works by rewriting the URLs of files (excluding .php files) in wp-content and wp-includes on your server so they point at a different hostname. Many CDNs support <a href="https://www.google.com/search?hl=en&q=%22origin+pull%22" rel="nofollow ugc">origin pull</a>. This means the CDN will download the file automatically from your server when it’s first requested, and will continue to serve it for a configurable length of time before downloading it again from your server.
Configure this on the “CDN” tab of the plugin settings page. This is an advanced technique and requires a basic understanding of how your webserver or CDNs work. Please be sure to clear the file cache after you configure the CDN.
<h4>REST API</h4>
There are now REST API endpoints for accessing the settings of this plugin. You’ll need to be authenticated as an admin user with permission to view the settings page to use it. This has not been documented yet but you can find all the code that deals with this in the “rest” directory.
<h4>Custom Caching</h4>
It is now possible to hook into the caching process using the add_cacheaction() function.
Three hooks are available:
<ol>
<li>‘wp_cache_get_cookies_values’ – modify the key used by WP Cache.</li>
<li>‘add_cacheaction’ – runs in phase2. Allows a plugin to add WordPress hooks.</li>
<li>‘cache_admin_page’ – runs in the admin page. Use it to modify that page, perhaps by adding new configuration options.</li>
</ol>
There is one regular WordPress filter too. Use the “do_createsupercache” filter 
to customize the checks made before caching. The filter accepts one parameter. 
The output of WP-Cache’s wp_cache_get_cookies_values() function.
WP Super Cache has its own plugin system, loaded before most of WordPress. Add your own plugin either by putting it in the wp-content/plugins/wp-super-cache-plugins directory, or by calling wpsc_add_plugin( $name ) with the full path to the plugin.
The cookies used to identify “known users” can be modified with wpsc_add_cookie( $name ) and wpsc_delete_cookie( $name ). See <a href="https://github.com/Automattic/wp-super-cache/blob/4cda5c0f2218e40e118232b5bf22d227fb3206b7/plugins/searchengine.php" rel="nofollow ugc">plugins/searchengine.php</a> as an example.
<h3>Troubleshooting</h3>
If things don’t work when you installed the plugin here are a few things to check:
<ol>
<li>Is wp-content writable by the web server?</li>
<li>Is there a wp-content/wp-cache-config.php ? If not, copy the file wp-super-cache/wp-cache-config-sample.php to wp-content/wp-cache-config.php and make sure WPCACHEHOME points at the right place.</li>
<li>Is there a wp-content/advanced-cache.php ? If not, then you must copy wp-super-cache/advanced-cache.php into wp-content/. You must edit the file and change the path so it points at the wp-super-cache folder.</li>
<li>If pages are not cached at all, remove wp-content/advanced-cache.php and recreate it, following the advice above.</li>
<li>
Make sure the following line is in wp-config.php and it is ABOVE the “require_once(ABSPATH.’wp-settings.php’);” line:
<pre><code>define( 'WP_CACHE', true );
</code></pre>
</li>
<li>Try the Settings->WP Super Cache page again and enable cache.</li>
<li>Look in wp-content/cache/supercache/. Are there directories and files there?</li>
<li>Anything in your php error_log?</li>
<li>If your browser keeps asking you to save the file after the super cache is installed you must disable Super Cache compression. Go to the Settings->WP Super Cache page and disable it there.</li>
<li>File locking errors such as “failed to acquire key 0x152b: Permission denied in…” or “Page not cached by WP Super Cache. Could not get mutex lock.” are a sign that you may have to use file locking. Edit wp-content/wp-cache-config.php and uncomment “$use_flock = true” or set $sem_id to a different value. You can also disable file locking from the Admin screen as a last resort.</li>
<li>Make sure cache/wp_cache_mutex.lock is writable by the web server if using coarse file locking.</li>
<li>The cache folder cannot be put on an NFS or Samba or NAS share. It has to be on a local disk. File locking and deleting expired files will not work properly unless the cache folder is on the local machine.</li>
<li>Garbage collection of old cache files won’t work if WordPress can’t find wp-cron.php. Check your access_logs for wp-cron.php entries and that your hostname resolves to the external IP address other servers on the network/Internet use.</li>
<li>If old pages are being served to your visitors via the supercache, you may be missing Apache modules (or their equivalents if you don’t use Apache). 3 modules are required: mod_mime, mod_headers and mod_expires. The last two are especially important for making sure browsers load new versions of existing pages on your site.</li>
<li>The error message, “WP Super Cache is installed but broken. The path to wp-cache-phase1.php in wp-content/advanced-cache.php must be fixed!” appears at the end of every page. Open the file wp-content/advanced-cache.php in your favourite editor. Is the path to wp-cache-phase1.php correct? This file will normally be in wp-content/plugins/wp-super-cache/. If it is not correct the caching engine will not load.</li>
<li>Caching doesn’t work. The timestamp on my blog keeps changing when I reload. Check that the path in your .htaccess rules matches where the supercache directory is. You may have to hardcode it. Try disabling supercache mode.</li>
<li>
If supercache cache files are generated but not served, check the permissions on all your wp-content/cache/supercache folders (and each of wp-content cache and supercache folders) and wp-content/cache/.htaccess. If your PHP runs as a different user to Apache and permissions are strict Apache may not be able to read the PHP generated cache files. To fix you must add the following line to your wp-config.php (Add it above the WP_CACHE define.) Then clear your cache.
<pre><code>umask( 0022 );
</code></pre>
</li>
<li>
If you see garbage in your browser after enabling compression in the plugin, compression may already be enabled in your web server. In Apache you must disable mod_deflate, or in PHP zlib compression may be enabled. You can disable that in three ways. If you have root access, edit your php.ini and find the zlib.output_compression setting and make sure it’s “Off” or add this line to your .htaccess:
<pre><code>php_flag zlib.output_compression off
</code></pre>
If that doesn’t work, add this line to your wp-config.php:
<pre><code>ini_set('zlib.output_compression', 0);
</code></pre>
</li>
<li>After uninstalling, your permalinks may break if you remove the WordPress mod_rewrite rules too. Regenerate those rules by visiting the Settings->Permalink page and saving that form again.</li>
<li>If your blog refuses to load make sure your wp-config.php is correct. Are you missing an opening or closing PHP tag?</li>
<li>Your front page is ok but posts and pages give a 404? Go to Settings->permalinks and click “Save” once you’ve selected a custom permalink structure. You may need to manually update your .htaccess file.</li>
<li>
If certain characters do not appear correctly on your website your server may not be configured correctly. You need to tell visitors what character set is used. Go to Settings->Reading and copy the ‘Encoding for pages and feeds’ value. Edit the .htaccess file with all your Supercache and WordPress rewrite rules and add this at the top, replacing CHARSET with the copied value. (for example, ‘UTF-8’)
<pre><code>AddDefaultCharset CHARSET
</code></pre>
</li>
<li>The error message, “WP Super Cache is installed but broken. The constant WPCACHEHOME must be set in the file wp-config.php and point at the WP Super Cache plugin directory.” appears at the end of every page. You can delete wp-content/advanced-cache.php and reload the plugin settings page or edit wp-config.php and look for WPCACHEHOME and make sure it points at the wp-super-cache folder. This will normally be wp-content/plugins/wp-super-cache/ but you’ll likely need the full path to that file (so it’s easier to let the settings page fix it). If it is not correct the caching engine will not load.</li>
<li>If your server is running into trouble because of the number of semaphores used by the plugin it’s because your users are using file locking which is not recommended (but is needed by a small number of users). You can globally disable file locking by defining the constant WPSC_DISABLE_LOCKING, or defining the constant WPSC_REMOVE_SEMAPHORE so that sem_remove() is called after every page is cached but that seems to cause problems for other processes requesting the same semaphore. Best to disable it.</li>
<li>Set the variable $htaccess_path in wp-config.php or wp-cache-config.php to the path of your global .htaccess if the plugin is looking for that file in the wrong directory. This might happen if you have WordPress installed in an unusual way.</li>
</ol>

WP Super Cache


I've been using this caching plugin since before Automattic took over management. Since I don't get very much in the way of comments on my site, the vast majority of hits are anonymous and don't change what should be on the page next time, so a static cache helps a *lot*.


Major speedup for the typical use case


It is very easy to use and optimally accelerates the website(s). Many thanks for the free version, it's simply brilliant.


Very helpful tool

A very fast caching engine for WordPress that produces static html files.

LaunchWP vs WP Super Cache