How to flush the Azure Redis Cache with PowerShell

Recently I was working with a customer and they wanted an easy want to flush their Azure based Redis cache of all key/value pairs. One developer suggested iterating over each of the collection elements and removing the iterated item, another suggestion was to delete and recreate the Redis cache from scratch. Both are valid suggestions but also not efficient ways to simply flush the Azure Redis cache of all data.

So I have written a simple PowerShell script to flush the cache for you.

You will need the ‘StackExchange.Redis.dll’ to be in the same directory as the script as there isn’t a REST client API you can easily call so you need to call the client DLL directly. You can easily get that via the Visual Studio NuGet package and just copy it to the script folder.

From there the script is pretty self explanatory

The code is below:

##Global variables [string]$RedisCacheHost = "<CACHE_ENDPOINT>" [string]$RedisCacheKey = "<CACHE_KEY>" [int]$RedisCachePort = "6380" #Flushes the Azure cache function FlushCache { param( [string] [parameter(mandatory)] $RedisCacheHost, [string] [parameter(mandatory)] $RedisCacheKey, [int] [parameter(mandatory)] $RedisCachePort ) Write-Host "Flushing cache on host - $RedisCacheHost" -ForegroundColor Yellow #connection string $redis_connstr = "$RedisCacheHost,ssl=true,password=$RedisCacheKey,allowAdmin=true" #Add the Redis type from the assembly Add-Type -Path "StackExchange.Redis.dll" -PassThru | out-null #open a connection [object]$redis_cache = [StackExchange.Redis.ConnectionMultiplexer]::Connect($redis_connstr,$null) #Flush the cache $redisServer = $redis_cache.GetServer($RedisCacheHost, $RedisCachePort,$null) $redisServer.FlushAllDatabases() #Dispose connection $redis_cache.Dispose() Write-Host "Cache flush done" -ForegroundColor Yellow } #Get Subscription details $subscription = Get-AzureSubscription -Current -ErrorAction Stop if($subscription -eq $null) { Write-Host "Windows Azure Subscription is not configured or the specified subscription name is invalid." Write-Host "Use Get-AzurePublishSettingsFile and Import-AzurePublishSettingsFile first" return } #Call the function FlushCache -RedisCacheHost $RedisCacheHost -RedisCacheKey $RedisCacheKey -RedisCachePort $RedisCachePort


About Aaron Saikovski

Aaron Saikovski is a Microsoft certified technology specialist, consultant, developer, trainer and cloud solution architect with over 20+ years commercial information technology experience. He has consulted and worked with an incredibly diverse number of both local and international clients across the banking and financial services, utilities, oil and mining, telecommunications, logistics, construction/property, pharmaceutical, transport/airline and FMCG sectors. He has also consulted on a variety of projects to both Federal and State governments in high-profile portfolios such as Prime Minister and Cabinet, Department of Defence, Taxation Office, Department of Education and Training, Department of Employment & Workplace Relations and the Department of Health. Aaron’s skills revolve around the Microsoft platform stack with a core skillset based on the SharePoint platform. He has been involved in some of the largest SharePoint deployments in the world and was a member of the Global SharePoint Ranger team within Microsoft Corporation and was actively involved with the SharePoint Customer Advisory Team (SPCAT) to provide guidance and best practices to the largest Microsoft enterprise global customers. He was also an active MSDN article reviewer and contributor during his time at Microsoft. He has very broad and deep experience with architecting, developing and deploying complex customer solutions leveraging the Microsoft Office365 and Azure cloud platforms. Some of the key cloud customers he has been involved with are Qantas, Caltex, and Fujitsu/Westpac to name a few. He assists customers with their journey to the cloud and provides guidance and best practices to assist in identifying workloads that are suitable candidates to be migrated or redeveloped. These include IaaS, SaaS and PaaS solutions that solve a particular business requirement while providing the best technical outcome for the customer. Aaron is a regular presenter at such events as SharePoint Saturday (, Microsoft TechEd and is a regular presenter at user groups and conferences. He presents on a wide and varied range of topics that encompass the complete end to end Microsoft solution stack such as Windows 8 App development through to deploying Azure IaaS solutions with PowerShell. Aaron has an active social media profile. He was the founding member of OzMoss (, a very active and prominent online SharePoint community and he can be followed on Twitter at @RuskyDuck72. He blogs regularly at Aaron is also an active affiliate member of the Institute of Electrical and Electronics Engineers ( Outside of work Aaron is a very active volunteer for DoggieRescue ( where he volunteers his time to maintain and improve their IT systems to keep them running as optimally and efficiently as possible. ** OPINIONS EXPRESSED ARE MY OWN VIEWS AND NOT THOSE OF MY EMPLOYER **
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