Rules of AEM

How to Delete Dispatcher cache without logging into the Dispatcher servers? Our Authoring team faces day to day challenges while deleting/flush the dispatcher cache. when the changes are not visible on server. They have to be depended on the IT operations/Dev ops teams to do the same. Which some time get very much time consuming for a small work.  In this article we will see it can be configure and used by Author UI itself.  This will allow  AEM authors (or “super authors”) to flush parts of the dispatcher cache manually without the involvement of IT Operations. How to Use 1. Log in to AEM Author 2. Download the ACS commons tool from  ACS Commons Official page 3. Install the downloaded package via aem package manager.   4. Make sure you create the dispatcher flush agents on Author for all Dispatchers. from http://<<host:port>>/miscadmin#/etc/replication/agents.author, check the NOTE's part at the end of page. 5. Navigate to Tools 6. Under the ac...

AEM DISPATCHER STATFILE UNDERSTANDING & CACHE INVALIDATION:- AEM Developers, Infrastructure Engineers regularly come across a challenge on decoding the statfile and using it efficiently especially statfile becomes highly relevant in a multi-tenanted environment with different project teams controlling different sites. The article addresses in a simple way on how to understand the mechanisms of stat file and gives a detailed explanation of how it can be used in a multi-tenant environment model.  The image for your reference as a quick overview of the data flow, before we take a deep dive.  This article covers - 1 - When dispatcher serves the old version of the content. How to avoid it. 2- Cache invalidation mechanism. Assumption - If you are reading this article, I believe you would have a basic understanding of Dispatcher and it's configuration. Firstly let’s set the initial configuration for the cache invalidation section ...

How to clear dispatcher cache in aem ? As you may know, the Dispatcher cache in Adobe Experience Manager (AEM) is used to improve the performance of your website by caching static resources and pages. However, sometimes you may need to clear the cache to ensure that the latest content and changes are displayed on your website. In this blog post, we'll show you how to clear the Dispatcher cache in AEM.   This method will clear the entire Dispatcher cache, including all cached pages and resources. Keep in mind that clearing the cache may affect the performance of your website, as it may take some time to rebuild the cache. Clear Cache using the Dispatcher Flush Agent You can use the Dispatcher Flush Agent. Follow these steps:   Log in to your AEM instance and navigate to http://localhost:4502/etc/replication/agents.author.html . Click on the "Dispatcher Flush" agent to open the agent's configuration page. Clic...

How to Allow Block IP through AEM Dispatcher ?   AEM Dispatcher works as last man standing for your AEM servers. Many business has the requirement to allow only their internal network IP for Author or publish servers. To achieve this use case for the customer we can use dispatcher configuration explained below. The dispatcher is used as a load balancing/caching tool by AEM. It can also be used to block anyone from accessing your AEM author instance. This is to ensure that no one outside the client’s network can access it. AEM Author and publisher should never be exposed directly. In most cases, clients may also require a block to be put on AEM pub dispatchers before going live. This is to ensure that no one can see the site except for the client so performance, penetration, and UAT testing can be performed before going live. In this article, we will see, 5 easy steps to enable IP whitelisting in Apache so only the allowed list of IPs have access to AEM through the dispatcher. Or yo...

 Maven build is failing due to CHECKSUM issue.  AEM Developers, Infrastructure Engineers regularly come across a challenge on building the AEM code & dispatcher module use to get failed while mvn build. The article addresses in a simple way on how to understand the mechanisms of dispatcher module build, and gives a detailed explanation of how it can be resolved.  This is useful for  building the code for a deployment via Pipeline either it is Adobe Cloud manager or Jenkins, you can see this error while your local build itself.  This error is caused, as the dispatcher owner does not not want you to change/modify few of its default files which are marked as immutable in dispatcher server.  You can find full list of immutable files on of dispatcher provided by Adobe.  https://helpx.adobe.com/experience-manager/kb/ams-dispatcher-manual/immutable-files.html Issue :- In AEM while doing the deployment it is being seen , user get the exception , Maven ma...

How to protect AEM against CSRF Attack ? Adobe Experience Manager (AEM) is a popular content management system that is widely used to develop and manage websites, mobile apps, and other digital experiences. However, like any other web application, AEM is vulnerable to cross-site request forgery (CSRF) attacks. CSRF attacks are malicious attacks where an attacker tricks a user into performing an action they did not intend to perform by exploiting the user's active session on a website. In this blog, we will discuss some measures that can be taken to protect AEM from CSRF attacks.   Implement CSRF protection in AEM:   The first and most important step to protect AEM from CSRF attacks is to implement CSRF protection in the application. AEM provides a built-in CSRF protection mechanism that can be enabled by setting the "sling.filter.methods" property in the OSGi configuration.  Navigate to the OSGi Web Console (/system/console/configMgr). Search for Apache Sling Refe...