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Cloud · head to head

Azure Functions vs Rancher

Azure Functions logo

Azure Functions

Cloud

Event-driven serverless compute on Azure

From
Free
Rated
-
Full reviewWebsite
Rancher logo

Rancher

Cloud

Kubernetes management platform for multiple clusters

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Azure Functions consumption plan free grant is capped at 1 million executions and 400,000 GB-seconds of resource consumption per month per subscription, billed per GB-second beyond that; Rancher another platform to run and keep available, and an outage in it affects access to everything it manages

Where they differ

Only the attributes on which Azure Functions and Rancher actually diverge.

Attributes where Azure Functions and Rancher differ
AttributeAzure FunctionsRancher
Pricing modelusage-basedOpen source, no licence fee
PlatformsWebKubernetes, Linux, Docker, Self-hosted

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Cloud).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Azure Functions

Nothing recorded that Rancher does not also cover.

Only in Rancher

  • Multi-cluster management
  • Centralised RBAC
  • Cluster provisioning
  • App catalogue

What people use each for

The jobs each tool is most often brought in to do.

Azure Functions

  • Event-driven computingnot Rancher
  • Serverless application backendnot Rancher
  • Scalable API endpointsnot Rancher

Rancher

  • Operating many Kubernetes clusters with consistent access controlnot Azure Functions
  • Managing clusters across more than one cloud provider from one interfacenot Azure Functions
  • Edge deployments with many small clusters, typically alongside K3snot Azure Functions

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Azure Functions

  • Consumption plan free grant is capped at 1 million executions and 400,000 GB-seconds of resource consumption per month per subscription, billed per GB-second beyond that
  • The newer Flex Consumption plan's free grant is smaller still, at 250,000 executions and 100,000 GB-seconds per month
  • Premium plan avoids per-execution charges but bills continuously for allocated core seconds and memory regardless of invocation volume
  • Memory is rounded up to the nearest 128 MB and execution time to the nearest 1 ms for billing, so small overages round upward

Rancher

  • Another platform to run and keep available, and an outage in it affects access to everything it manages
  • Meaningful overhead if you only operate one or two clusters
  • Version compatibility between Rancher and managed Kubernetes versions needs watching during upgrades
  • Support requires a SUSE subscription; the project itself is community-supported

Pricing, plan by plan

Azure Functions

Free
  • Consumption Plan$null/month
    • 1 million requests free monthly
    • 400,000 GB-seconds free monthly
    • Billed per second and executions
  • Flex Consumption Plan$null/month
    • 250,000 executions free monthly
    • 100,000 GB-seconds free monthly
    • Event-driven scaling
  • Premium Plan$null/month
    • No execution charges
    • At least one instance required
    • Includes automatic scaling and VNET access

Rancher

Free
  • RancherFree
    • Full functionality
    • No data limits
    • Community support

Which should you pick?

Choose Azure Functions if

  • You want to start without paying.
Azure Functions review

Choose Rancher if

  • You need multi-cluster management.
  • You want to start without paying.
  • You work on Kubernetes, Linux, Docker, Self-hosted.
  • You also want centralised rbac.
Rancher review

Questions people ask

Is Azure Functions or Rancher better?
Neither clearly leads. Azure Functions starts at Free and Rancher at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Azure Functions or Rancher?
Azure Functions starts at Free and Rancher at Free.
Does Azure Functions or Rancher run on more platforms?
Azure Functions runs on Web. Rancher runs on Kubernetes, Linux, Docker, Self-hosted.
Can I use Azure Functions for free?
Both have a free tier, so you can try either at no cost before committing.
What is Azure Functions best used for?
Azure Functions is most often used for event-driven computing, serverless application backend, scalable api endpoints. Of those, event-driven computing and serverless application backend are not what Rancher is typically brought in for.
What can Azure Functions do that Rancher cannot?
Rancher covers Multi-cluster management, Centralised RBAC, Cluster provisioning, App catalogue.

Answered from the vendors’ own pages

Azure Functions: Does Azure Functions have a free tier?

Yes, Azure Functions includes a monthly free grant of 1 million requests and 400,000 GB-seconds on the Consumption Plan, or 250,000 executions and 100,000 GB-seconds on Flex Consumption.

Source
Rancher: Is Rancher free?

Yes, open source with no licence fee. SUSE sells support subscriptions.

Azure Functions: What is Azure Functions' pricing model?

Azure Functions uses usage-based pricing. Consumption plans charge per second of resource consumption and per execution, measured in gigabyte-seconds and rounded to the nearest 128 MB.

Source
Rancher: Does Rancher work with EKS and GKE?

Yes. It imports and manages existing clusters regardless of who provisioned them, alongside clusters it creates itself.

Azure Functions: What is the minimum execution time for Azure Functions?

The minimum execution time is 100 milliseconds on Consumption plans. Premium plans charge based on core seconds and allocated memory.

Source
Rancher: Do I need Rancher for one cluster?

Generally no. Its value appears when cluster count and consistent access control become the problem, which is not the case with one.

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