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How to Increase Apache Request Per Second ?

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How to Increase Apache Request Per Second ? By default, Apache web server is configured to support 160 requests per second. As your website traffic increases, Apache will start dropping additional requests and this will spoil customer experience.  Here’s how to increase Apache requests per second. 1. Install MPM module We need to install MPM Apache module to be able to increase Apache requests per second. You can use mpm_worker or mpm_event module for this, instead of mpm_prefork module which consumes a lot of memory. You can easily install MPM module in Apache with following command For CentOS7/RHEL7 : Adjust /etc/httpd/conf.modules.d/00-mpm.conf Comment the line LoadModule mpm_prefork_module modules/mod_mpm_prefork.so by adding # in front of it. Uncomment the line LoadModule mpm_worker_module modules/mod_mpm_worker.so by removing # in front of it. For Ubuntu/Debian :  Use a2dismod / a2enmod to disable mpm_prefork and enable mpm_worker 2. Increase Max Connections in Apach...
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Configure/Decoding AEM AuditLogs

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AEM Developers, Infrastructure Engineers / Dev-ops teams working in the financial domain regularly come across a challenge for event auditing in AEM. This helps in identifying most of the activities happening in AEM. Audit logs are a very effective way to debug the content issue & to know what all is happening in your environment and by whom. This article addresses in a simple way on how to enable the audit logs, its different ways, and how to understand the audit logs.  This article covers the following - How can we enable Audit logs in AEM. How can we read and understand the Audit logs/ tools to use it. Audit log on file system in crx-quickstart/logs folder.   Audit logs for User creation / Modification. How can you archive/purge the audit logs. How can we enable Audit logs in AEM?            By Default, the Audit logs are pre-configured in AEM, for a few basic operations of DAM and for all other operations of Pages ...
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AdobeDispatcherHacks ".statfile"

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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 ...
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Migrating from AEM 6.x to AEM as a Cloud Service: What Developers Should Expect

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Migrating from AEM 6.x to AEM as a Cloud Service: What to Expect ? Introduction If you're currently managing an AEM 6.x project, chances are you’ve heard about AEM as a Cloud Service (AEMaaCS). Adobe is clearly shifting toward this cloud-native model for low/medium complex customers and while there are definite benefits, developers should be prepared for a few surprises too. I recently worked on a migration project and wanted to share what developers should expect , from code refactoring and CI/CD changes to losing root access and dealing with strict dispatcher rules.     Whats is Great about AEMaaCS  1. Automatic Upgrades Say goodbye to manual patching. AEMaaCS updates automatically.  Adobe handles the platform updates, with no need to plan downtime or test service packs. 2. CI/CD with Cloud Manager Deployments go through Adobe Cloud Manager, which checks for code quality, security, and performance before pu...
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Caching Strategy - CDN-APACHE - Example Headers

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Caching Strategy - CDN/APACHE - Internal working & Example Headers Imagine a company is hosting a website on a server in any cloud provider like AWS, AZUR, GCP . It may take around 100ms to load for users in US, but it takes 3–5 seconds to load for users in Finland. Fortunately, there are strategies to minimize this request latency for far-away users. These are called Caching and Content Delivery Networks (CDNs), which are two important concepts in modern web development and systems design. CDN are of different-different type   based on cloud service provider below are few most used ones – Cloud Front , by AWS Azure Front Door Content delivery solution from Akamai Different Caching Strategies Caching data can greatly improve the performance of applications. There are typically 4 common places where we can store cached data. Browser Caching Browser caching involves storing website resources on a user’s local computer. When a user revisits a site, the brow...
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How to Sync HMAC in AEM ?

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Crypto Support in AEM (Syncing HMAC among AEM instances) AEM OOTB provides a feature where we can encrypt the secured and confidential data through OOTB AEM Crypto Support and store it in a code repository in the form of OSGi configuration. Crypto Support is based on keys (hmac and master files) which are unique for each AEM instance. Encrypted text generated for the same plain-text string on one AEM instance will be different from another instance. This can raise alarms in cases where we have the same OSGi configuration values shared among Author and Publish instances under the same topology. For e.g. /apps/project/config.prod/com.day.cq.db.dbservice.xml Here DB password for Default DB Service will be same across all Prod AEM instances. So, in order to make sure that the same encrypted value works on all Prod instances, we will have to sync hmac and master files among Prod Author and Publish instances. Vital Points to know before HMAC SYNC  Sync of HMAC/keys will break the AEM SSL...
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how to clear dispatcher cache in aem ?

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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...
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How to prevent DDoS in Apache ?

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Prevent DDoS in Apache & IP Block Automation DDoS (Distributed Denial of Service) attacks are a type of cyberattack that can cause serious damage to your web server. These attacks involve flooding your server with a huge volume of traffic, overwhelming its resources and causing it to crash. In this blog post, we'll discuss how to prevent DDoS attacks in Apache, without using any third part tool/application.     Available Options to Prevent DDoS : You can use various mentioned methods to achieve the same. But using WAF, CDN, etc will cost extra dollars. Which might not be necessary for a small scale application.   Use a Web Application Firewall (WAF): A WAF can help detect and block malicious traffic before it reaches your Apache server. It can also help block common attack vectors, such as SQL injection and cross-site scripting (XSS). Install mod_evasive: mod_evasive is an Apache module that helps detect and block DDoS attac...
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OakAccess0000: Access denied

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ERROR :-   OakAccess0000: Access denied We often observe while doing the AEM development or in live running environment we get the error code  OakAccess0000 , especially while running a workflow or any asset upload. This issue disrupts normal operation. As content authors are unable to perform essential task like uploading or managing content, leading to business impact.   This impact the business as content author are unable to upload any content.  Error stack trace :- Javax.jcr.AccessDeniedException: OakAccess0000: Access denied  at org.apache.jackrabbit.oak.api.CommitFailedException.asRepositoryException(CommitFailedException.java:232) [org.apache.jackrabbit.oak-api:1.10.6]  at org.apache.jackrabbit.oak.api.CommitFailedException.asRepositoryException(CommitFailedException.java:213) [org.apache.jackrabbit.oak-api:1.10.6]  at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.newRepositoryException(SessionDelegate.java:669) [org.apache...
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How to protect AEM against CSRF Attack ?

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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...
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