Hi,
I would like to configure my app according to the current instance count. The goal is to activate background jobs on the first instance of the app ; and to avoid to activate it for the next instances.
I'm using Azure App Service and starting the app with 1 instance. The app can switch to 2/3or 4 instances according to the CPU/RAM load.
I will use the environment variable WEBSITE_INSTANCE_ID to manage this : this value gives a unique instance ID.
My idea is to store this value (in cache or somewhere else). When app starts, I need to read this value in the PostInitialize method of WebHostModule class. If the value exists, I don't activate the background jobs for the instance. If no value set, then I start the backgound jobs for current instance (which should be the first).
Can you please help me to achieve this ? Specialy for the read/write data in the postinitialize method ?
This could help a lot of people that is struggling out with multiple instances on ABP.
Thks
3 Answer(s)
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Hi @Ricavir
Are you able to get
WEBSITE_INSTANCE_ID? If so, you can directly setConfiguration.BackgroundJobs.IsJobExecutionEnabledby using this value.Probably I couldn't understand at which point you need help. Please let me know if my answer doesn't help.
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Hi @Ismcagdas,
It has been a while since the last time :)
In fact, WEBSITE_INSTANCE_ID is an environment variable available on Azure App Service VM's. So, yes, I can read it.
My problem is that I want to store it somewhere outside the VM, this is why I need your help. I was thinking to store it in cache (I'm using Redis) or in Azure blob storage.
What is your advise about this ? Can I access cache or azure storage before setting Configuration.BackgroundJobs.IsJobExecutionEnabled ?
My goal is to activate background job execution only in the first instance ; the one that will start the app. Therefore, if a new instance is pushed in by Azure (automatic scale), the background job execution will not be started twice.
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Sorry @Ismcagdas, I just saw that Hangfire is able to manage background jobs on multiple instances. I will try it and come back to you if I need some additional help. This ticket can be closed.
