AEMaaCS : Dispatcher/CDN cache | Community
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aem-enthu27
Level 4
July 28, 2022
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AEMaaCS : Dispatcher/CDN cache

  • July 28, 2022
  • 3 replies
  • 4263 views

Hi,

 

Could you please calrify my below doubts.

1> Where can we configure caching rules for CDN?

2> In dispatcher we have /cache section within which we have /rule section to define which all are the files to be cached and /invalidate section to define which all are files to be considered for invalidating. so my question is , what happens to the files which are part of /rule section but not part of /invalidate section.

3>In our project all most all files are allowed to cache in /rule section but in /invalidate section only .html and mode.json is present . so how will clientlibs and dam assets gets invalidated ?

4> Should we cache assets are not ? what is the standard ?

5> What are must cache files in any aem sites.  

6> Do we still use dispatcher flush agents in publihs for invalidation of cache in AEMaaCS?

7> Do we need to add cache-control to response header with max-age as well to cache files in dispatcher ? /rule section is not enough ?

 

Thanks,

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Best answer by Tushar_Gupta

1> Where can we configure caching rules for CDN? - 

<LocationMatch "^/content/.*\.(html)$">
     Header set Cache-Control "max-age=200"
     Header set Surrogate-Control "max-age=3600"
     Header set Age 0
</LocationMatch>

these TTL's will be respected by Dispatcher/CDN both

 

2> In dispatcher we have /cache section within which we have /rule section to define which all are the files to be cached and /invalidate section to define which all are files to be considered for invalidating. so my question is , what happens to the files which are part of /rule section but not part of /invalidate section.

they will not cache on dispatcher

https://experienceleague.adobe.com/docs/experience-manager-dispatcher/using/configuring/dispatcher-configuration.html?lang=en 

3>In our project all most all files are allowed to cache in /rule section but in /invalidate section only .html and mode.json is present . so how will clientlibs and dam assets gets invalidated ?

it should be on TTL basis.

 

4> Should we cache assets are not ? what is the standard ?

Yes.

5> What are must cache files in any aem sites.  

Assets and try to cache whatever you can.

6> Do we still use dispatcher flush agents in publihs for invalidation of cache in AEMaaCS?

yes

7> Do we need to add cache-control to response header with max-age as well to cache files in dispatcher ? /rule section is not enough ?

max-age is optional.

3 replies

T
Adobe Employee
Tushar_GuptaAdobe EmployeeAccepted solution
Adobe Employee
July 28, 2022

1> Where can we configure caching rules for CDN? - 

<LocationMatch "^/content/.*\.(html)$">
     Header set Cache-Control "max-age=200"
     Header set Surrogate-Control "max-age=3600"
     Header set Age 0
</LocationMatch>

these TTL's will be respected by Dispatcher/CDN both

 

2> In dispatcher we have /cache section within which we have /rule section to define which all are the files to be cached and /invalidate section to define which all are files to be considered for invalidating. so my question is , what happens to the files which are part of /rule section but not part of /invalidate section.

they will not cache on dispatcher

https://experienceleague.adobe.com/docs/experience-manager-dispatcher/using/configuring/dispatcher-configuration.html?lang=en 

3>In our project all most all files are allowed to cache in /rule section but in /invalidate section only .html and mode.json is present . so how will clientlibs and dam assets gets invalidated ?

it should be on TTL basis.

 

4> Should we cache assets are not ? what is the standard ?

Yes.

5> What are must cache files in any aem sites.  

Assets and try to cache whatever you can.

6> Do we still use dispatcher flush agents in publihs for invalidation of cache in AEMaaCS?

yes

7> Do we need to add cache-control to response header with max-age as well to cache files in dispatcher ? /rule section is not enough ?

max-age is optional.

    A
    aem-enthu27Author
    Level 4
    August 2, 2022

    Thanks tushar for the reply.I have few questions please answer them
    Please find my comments below .

    1> I have gone through several documents regarding CDN cache, you are right that surrogate-control can be used for CDN cache, and another way is to add "s-maxage" to cache-control header itself. But in our project we have not added niether of them but still CDN is caching I guess for 5 min, I confirmed this because "x-cache=HIT" was present in the response header. So I think CDN respects even "max-age" of cache-control header as well. So getting confused whether we can continue to use ma-age property itself for both dispatcher and CDN or should I add s-maxage or surrogate-control header please confirm.

    2> I think things will get cahced if we just have urls on /rules section , because we dont have assets and clientlibs as part of /invalidate section but /rules section. and they are getting cached.
    3>you mean max-age ?

    4>Our assets size is around 10-12 GB still ok to cache ?

    7>So If we have max-age property defined that means irrespective of whether page is republished or not things gets invalidated and get new copy from server as soon as time mentioned in the max-age is over?

      Sachin_Arora_
      Community Advisor
      Sachin_Arora_Community Advisor
      Community Advisor
      August 3, 2022

      2) Those file will remain in cache directory, until cleared manually. /invalidate section is for file that needs to be automatically invalidated when content is updated.

      3) Add rules for assets invalidation. Clientlibs follow versioning, so any update in JS/CSS will create new path for a clientlibs.

      4) It should be fine until space of cache directory is good enough. I have seen cache of asset heavy as 3-6 GB.

       

      7) Yes, if /enableTTL is enabled
      https://experienceleague.adobe.com/docs/experience-manager-dispatcher/using/configuring/dispatcher-configuration.html?lang=en

       

       

       

       

       

        B
        Adobe Employee
        BimmiSoAdobe Employee
        Adobe Employee
        July 28, 2022

        Hi @aem-enthu27 

         

        Please go through below url

         

        https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/implementing/content-delivery/cdn.html?lang=en

         

        Hope it helps!!

        Thanks

          Himanshu_Jain
          Community Advisor
          Himanshu_JainCommunity Advisor
          Community Advisor
          July 29, 2022

          Kindly refer https://experienceleague.adobe.com/docs/experience-manager-dispatcher/using/configuring/dispatcher-configuration.html?lang=en

           

           

           

           

           

          Himanshu Jain
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