Configure and Flush Blob Cache in SharePoint 2010

Enable BLOB Cache using PowerShell?

Why not! Web.config file changes can be made with "SPWebConfigModification" class. Lets utilize that to make a web.config change to enable BLOB cache:

BLOB Cache Configuration has the following Parameters: 

• location - Is the file system folder where SharePoint server stores cached files.Make sure you select the BLOB cache location on a drive with sufficient disk space!
• path - Is a lists all file extensions that will be cached. File types are separated by vertical pipe character.
• maxSize - In GB, disk space that the BLOB cache will occupy. If BLOBs exceeds this limit, SharePoint will delete older items in the cache to make room for newer items.
• max-Age - In seconds. It tells How long Browser can cache these files without making request to the server. Use it with value: 1814400 (Three Weeks), if you get: HTTP 304 error!
• enabled - Sets BLOB Cache ON or OFF. Make it "false" to disable BLOB Cache.

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Get the Web Application

$WebApp = Get-SPWebApplication "http://riponkundu.blogspot.in"

#Create a web.config modification

$WebconfigMod = New-Object Microsoft.SharePoint.Administration.SPWebConfigModification

$WebconfigMod.Path = "configuration/SharePoint/BlobCache"

$WebconfigMod.Name = "enabled"

$WebconfigMod.Sequence = 0

$WebconfigMod.Owner = "BlobCacheModification"

$WebconfigMod.Type = 1

$WebconfigMod.Value = "true"

    

#Apply the web.config change

$WebApp.WebConfigModifications.Add($WebconfigMod)

$WebApp.Update()

$WebApp.Parent.ApplyWebConfigModifications()

This will enable BLOB Cache. If you want to disable BLOB cache, just change the Parameter "enabled" to "false". Same method applies for additional parameters such as: Location, MaxSize, max-age etc.

How to Flush(Reset/Clear) BLOB cache in SharePoint 2010

Some times, You may notice your changes don’t appear in the site. All you have to do is: Flush the Cache! Here is the PowerShell to flush the BLOB cache (No GUI to do this!).


Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

$webApp = Get-SPWebApplication "http://riponkundu.blogspot.in"
[Microsoft.SharePoint.Publishing.PublishingCache]::FlushBlobCache($webApp)
Write-Host "BLOB Cache Flushed for:" $webApp