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Dispatcher Cache Invalidation for Multi Site Configuration - Adobe CQ5(AEM)

This post will explain the approach to invalidate the cache for particular site in multi site configuration - Adobe CQ5(AEM).

Recently, i was working on a dispatcher caching issue with multi site configuration - The cache was not getting invalidated in all the dispatcher.

The setup is with multiple dispatcher connected via load balancer. The load balancer will route the request to individual dispatchers via round robin algorithm. The dispatcher is configured with individual virtual host and farm for every site(Load balanced DNS is used).

The flush agent was configured in publisher for every site with load balanced DNS(the flush agent was equal to number of sites configured in dispatcher) - The issue here is when ever publisher send the invalidation request that is not reaching the corresponding dispatcher as the flush agent is configured with load balanced DNS for invalidation URI - The request will be send to random dispatcher from the load balancer due to this the cache will not be invalidated in all the dispatcher.

Solution:

Create a flush agent in individual publisher that points to individual dispatcher(based on the renders configuration). The flush agent should be configured with dispatchers server name(one flush agent in one publisher)

http://dispatcher1.server.name:80/dispatcher/invalidate.cache

Query the pages with the properties of child node - Adobe CQ5/AEM

Only a type can be imported. xxxxxx resolves to a package - AEM/Adobe CQ5

We were receiving the following error in run time due to this the pages got broken. The same scenario was working fine earlier and broken without any code or config change to the server.

We have tried multiple options as follows without any luck

• Re-deploying the code to affected server
• Restarting the server
• Removing run time class files - /var/classes/org/apache
• Recompile/Clear the JSP classes - http://www.albinsblog.com/2016/04/how-to-clearrecompile-jsp-classes-in-AEM-6.1.html

How to disable the online compaction - AEM/Adobe CQ5

Adobe Experience Manager(AEM) 6.1 will have daily job scheduled and that will perform the online compaction.

Some times this may cause performance issue when the online compaction takes more time to complete due to load or authoring.

As a solution the online compaction job can be disabled and offline compaction can be used whenever required based on the maintenance window.

Steps to disable online compaction:

•  Go to CRXDE path - /libs/granite/operations/config/maintenance/granite:daily/granite:RevisionGC

• Changed run mode from crx3 to crx3-disabled

• Save

java.util.concurrent.ExecutionException: hudson.util.IOException2: Failed to create a temporary file in xxxxx/figerprints/2c/73

We were receiving the following exception while executing the deployment jobs from Jenkins

java.util.concurrent.ExecutionException: hudson.util.IOException2: Failed to create a temporary file in xxxxx/figerprints/2c/73


The deployment got success after freeing some space in the server.

How to manage the i18 translation in Adobe CQ5 (AEM)

This post will explain how to manage the i18 translation in Adobe CQ5 (AEM)

How to restrict crawling/indexing of specific URLs in Adobe Search and Promote(Adobe S&P)

Some cases we may need to index specific type of URLs from the website and excluding all other URLs available.

The URL Masks can be used in Adobe S&P to achieve this.

URL mask will help us to define the rules to include or exclude the specific URLs during the indexing.

We will be able to define include and exclude rules

Include - pattern that specifies the URLs will be indexed
Exclude - pattern that specifies the URLs will be excluded from the indexing.

To index the URLs that is starting with mask.


The crawler will index all the URLs that starts with https://server.com/content/doc

How to Clear/Recompile the JSP classes in Adobe Experience Manager(AEM) 6.1

Sometime when we are deploying the packages, the JSP classes will not get compiled automatically in Adobe Experience Manager(AEM) 6.

We can follow the below option to clear/recompile the JSP classes.

Login to - http://<AEM HOST>:<AEM PORT/system/console/slingjsp

Click on Recompile all JSPs

Pending - Waiting for next available executor/Disk space too low on /tmp - Jenkins

While we were trying to execute the job, it was displaying "Pending - Waiting for next available executor". When looking into the Jenkins node from the console, the Master node is offline and the error message displayed was "Disk space too low. Only xxxGB on /tmp" but the /tmp folder has space around 1GB.

Steps are followed to resolve the issue

• Increase the space available in /tmp folder. If not able to increase the space in /tmp folder then TemporarySpaceMonitor can be disabled or the memory threshold value of the TemporarySpaceMonitor can be reduced in $JENKINS_HOME/nodeMonitors.xml(make sure atleast minimum memory is available)

Restricting the content access to authenticated user - Adobe CQ5/AEM

By default anonymous user in Adobe Experience Manager(AEM) will have the read access to content, so the content can be accessed via dispatcher/publisher directly without providing any credential.

This blog will explain how to restrict the content access to only authenticated users via dispatcher(including cached content) and publisher.

Remove the access of Anonymous user for content node in publisher


Create a user sample1 in publisher and provide the read access for content node (Multiple users can be created based on the requirement)

Enabling basic authentication for different directories with different credentials in dispatcher - Adobe CQ5/AEM

Separate credential for two different directories:

Create the .httpaccess for different directories

htpasswd -c /etc/httpd/conf/dispatcher.htaccess <username>
htpasswd -c /etc/httpd/conf/dispatcher1.htaccess <username>

Add the below configuration in the httpd.conf

<LocationMatch ^/content/sample1*>
# unsets authorization header when sending request to AEM
RequestHeader unset Authorization
SetEnvIf Request_URI ^/content/sample1* auths=0
AuthName "Please login to access the site"
AuthType Basic
AuthUserFile /etc/httpd/conf/dispatcher.htaccess
# first, allow everybody
Order Allow,Deny
Satisfy any
Allow from all
Require valid-user
# then, deny only if required
Deny from env=auths
</LocationMatch>

<LocationMatch ^/content/sample2*>
# unsets authorization header when sending request to AEM
RequestHeader unset Authorization
SetEnvIf Request_URI ^/content/sample2* auths=1
AuthName "Please login to access the press release"
AuthType Basic
AuthUserFile /etc/httpd/conf/dispatcher1.htaccess
# first, allow everybody
Order Allow,Deny
Satisfy any
Allow from all
Require valid-user
# then, deny only if required
Deny from env=auths
</LocationMatch>

Restart the dispatcher

Now you will be able to access /content/sample1 and /content/sample2 with different credential

There is a another scenario, separate credential for particular directory and rest of all the directories will use the same credentials.

Create the .httpaccess for different directories

htpasswd -c /etc/httpd/conf/dispatcher.htaccess <username>
htpasswd -c /etc/httpd/conf/dispatcher1.htaccess <username>

<Location />
# unsets authorization header when sending request to AEM
RequestHeader unset Authorization
SetEnvIf Request_URI ^/content/* auths=1
SetEnvIf Request_URI ^/content/sample2* auths=0
AuthName "Please login to access the site"
AuthType Basic
AuthUserFile /etc/httpd/conf/dispatcher.htaccess
# first, allow everybody
Order Allow,Deny
Satisfy any
Allow from all
Require valid-user
# then, deny only if required
Deny from env=auths
</Location>

<LocationMatch ^/content/sample2*>
# unsets authorization header when sending request to AEM
RequestHeader unset Authorization
SetEnvIf Request_URI ^/content/sample2* auths=1
AuthName "Please login to access the press release"
AuthType Basic
AuthUserFile /etc/httpd/conf/dispatcher1.htaccess
# first, allow everybody
Order Allow,Deny
Satisfy any
Allow from all
Require valid-user
# then, deny only if required
Deny from env=auths
</LocationMatch>

Restart the server.

send-mail: fatal: open /etc/postfix/main.cf: No such file or directory - Linux

I was receiving the following exception "send-mail: fatal: open /etc/postfix/main.cf: No such file or directory" while trying to send the mail through cron job. But the main.cf file is available in the specified location /etc/postfix/main.cf.

I tried providing the complete permission to /etc/postfix/main.cf but this not resolved the issue.

Steps to fix the issue:

yum reinstall postfix

postfix stop
postfix start

Not able to access the siteadmin and useradmin pages - Adobe CQ5/AEM

We were not able to access the useradmin,siteadming and other website pages in one of our AEM/CQ5 publisher but was able to access the crxde and system console.

After analysis the issue is due to some of the bundles were stopped(100+), we tried to start those bundles manually without any luck.

The following was the exception in the log file.

11.01.2016 16:48:47.307 *ERROR* [FelixDispatchQueue] com.day.cq.collab.cq-collab-core FrameworkEvent ERROR (org.osgi.framework.BundleException: Unresolved constraint in bundle com.day.cq.collab.cq-collab-core [166]: Unable to resolve 166.0: missing requirement [166.0] osgi.wiring.package; (&(osgi.wiring.package=com.day.cq.collab.commons)(version>=0.0.0)(!(version>=5.7.0))) [caused by: Unable to resolve 165.0: missing requirement [165.0] osgi.wiring.package; (osgi.wiring.package=com.day.cq.wcm.api) [caused by: Unable to resolve 288.1: missing requirement [288.1] osgi.wiring.package; (osgi.wiring.package=com.day.cq.tagging) [caused by: Unable to resolve 218.1: missing requirement [218.1] osgi.wiring.package; (&(osgi.wiring.package=com.day.cq.search)(version>=1.1.0)(!(version>=2.0.0))) [caused by: Unable to resolve 209.1: missing requirement [209.1] osgi.wiring.package; (&(osgi.wiring.package=org.apache.abdera.ext.media)(version>=1.0.0)(!(version>=2.0.0)))]]]])

This error points to missing package of org.apache.abdera.ext.media and this belongs to the bundle - Abdera Extensions - Media.
After looking into the system console, the bundle is not there and it got uninstalled(not sure how it got uninstalled).

Follow the below steps to resolve the issue.

Identify the bundle id from another environment.

How to configure Caching algorithm for better performance in Hybris platform?

In local.properties file add/change the values of the following properties.

#Possible vales are FIFO(default), LRU and LFU. Default value is FIFO
cache.evictionpolicy=FIFO
#Possible vales are FIFO (default), LFU and LRU. Default value is FIFO
regioncache.entityregion.evictionpolicy=FIFO

#Possible vales are FIFO (default), LFU and LRU. Default value is FIFO
regioncache.typesystemregion.evictionpolicy=FIFO

#Possible vales are FIFO (default), LFU and LRU. Default value is FIFO
regioncache.querycacheregion.evictionpolicy=FIFO

Change the algorithm to either LFU or LRU based on your requirements for better performance.

How to disable all the cron jobs in Hybris platform

In local.properties file change the cronjob.timertask.loadonstartup property to false

cronjob.timertask.loadonstartup=false

Add the property if it is not there already.

This flag will not allow the system to start the cron jobs automatically after server restart.