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Cloud · head to head

K3s vs Serverless Framework

K3s logo

K3s

Cloud

Lightweight certified Kubernetes distribution in a single binary

From
Free
Rated
-
Full reviewWebsite
Serverless Framework logo

Serverless Framework

Cloud

Build and deploy serverless applications on AWS Lambda

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: K3s the SQLite default is single-server only; highly available control planes need etcd or an external datastore, which removes much of the simplicity; Serverless Framework exclusive to AWS Lambda - no support for other cloud providers
  • They diverge on capability: K3s covers Single binary, Serverless Framework covers YAML configuration.

Where they differ

Only the attributes on which K3s and Serverless Framework actually diverge.

Attributes where K3s and Serverless Framework differ
AttributeK3sServerless Framework
Pricing modelOpen source, no licence feeUnknown
PlatformsLinux, ARM, Self-hostedAWS Lambda, AWS API Gateway, AWS CloudFormation

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 K3s

  • Single binary
  • SQLite by default
  • Certified conformant
  • Batteries included
  • Low resource footprint
  • Simple install

Only in Serverless Framework

  • YAML configuration
  • Single command deployment
  • Extensible plugin ecosystem
  • Multi-language support
  • Unified dashboard
  • Built-in metrics and alerts

What people use each for

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

K3s

  • Kubernetes on edge sites and IoT hardware where full clusters will not fitnot Serverless Framework
  • Development and CI clusters that must start fast and cost nothingnot Serverless Framework
  • Small production clusters where full Kubernetes is more operations than the workload justifiesnot Serverless Framework
  • Teaching and learning Kubernetes without cloud spendnot Serverless Framework

Serverless Framework

  • Deploying APIs and microservices to AWS Lambdanot K3s
  • Building event-driven applications with serverless functionsnot K3s
  • Managing multi-language serverless projectsnot K3s

Where each one falls short

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

K3s

  • The SQLite default is single-server only; highly available control planes need etcd or an external datastore, which removes much of the simplicity
  • Bundled components such as Traefik are opinionated defaults that larger teams often strip out and replace
  • Removed in-tree cloud provider integrations mean cloud-specific features need external controllers
  • Aimed at small and edge clusters, so very large deployments are better served by a standard distribution

Serverless Framework

  • Exclusive to AWS Lambda - no support for other cloud providers
  • Paid tier requires credit system that can be confusing for budgeting
  • Plugin ecosystem quality varies significantly

Pricing, plan by plan

K3s

Free
  • K3sFree
    • Full functionality
    • No usage limits
    • Community support

Serverless Framework

Free
  • FreeFree
    • For organizations with under $2M annual revenue
    • All Framework features included
  • Pay-As-You-Go$4/credit
    • 1 credit = 1 Service Instance or 50K Traces or 4M Metrics
    • Standard rate for larger organizations
  • Reserved Credits$1/credit
    • Discounts up to 74% off (1-year), 77% off (2-year), 80% off (3-year)
    • Additional 10% off for upfront payment

Which should you pick?

Choose K3s if

  • You need single binary.
  • You want to start without paying.
  • You work on Linux, ARM, Self-hosted.
  • You also want sqlite by default.
K3s review

Choose Serverless Framework if

  • You need yaml configuration.
  • You want to start without paying.
  • You work on AWS Lambda, AWS API Gateway, AWS CloudFormation.
  • You also want single command deployment.
Serverless Framework review

Questions people ask

Is K3s or Serverless Framework better?
Neither clearly leads. K3s starts at Free and Serverless Framework at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, K3s or Serverless Framework?
K3s starts at Free and Serverless Framework at Free.
Does K3s or Serverless Framework run on more platforms?
K3s runs on Linux, ARM, Self-hosted. Serverless Framework runs on AWS Lambda, AWS API Gateway, AWS CloudFormation.
Can I use K3s for free?
Both have a free tier, so you can try either at no cost before committing.
What is K3s best used for?
K3s is most often used for kubernetes on edge sites and iot hardware where full clusters will not fit, development and ci clusters that must start fast and cost nothing, small production clusters where full kubernetes is more operations than the workload justifies, teaching and learning kubernetes without cloud spend. Of those, kubernetes on edge sites and iot hardware where full clusters will not fit and development and ci clusters that must start fast and cost nothing are not what Serverless Framework is typically brought in for.
What can K3s do that Serverless Framework cannot?
K3s covers Single binary, SQLite by default, Certified conformant, Batteries included. Serverless Framework covers YAML configuration, Single command deployment, Extensible plugin ecosystem, Multi-language support.

Answered from the vendors’ own pages

K3s: Is K3s free?

Yes. K3s is open source with no licence fee. SUSE sells commercial support around Rancher separately.

Serverless Framework: When do I have to pay for Serverless Framework?

The Serverless Framework CLI v4+ is free for organizations earning under $2 million annually. Organizations earning more must purchase credits at $4 per credit standard rate or reserved credits starting at $1 per credit with volume discounts.

Source
K3s: Is K3s real Kubernetes?

Yes. It is CNCF-certified conformant, so standard manifests, kubectl and Helm charts work without modification.

Serverless Framework: What cloud providers does Serverless Framework support?

Serverless Framework is exclusive to AWS Lambda. It does not support other cloud providers like Azure or Google Cloud.

Source
K3s: Why is K3s smaller than Kubernetes?

It strips legacy, alpha and in-tree cloud provider code, packages everything as one binary, and defaults to SQLite instead of etcd.

Serverless Framework: What does one credit cover?

One credit equals 1 Service Instance, 50,000 Traces, or 4 Million Metrics.

Source
K3s: Can K3s run in production?

Yes, and it does, particularly at the edge and for small clusters. For a highly available control plane you need to move off the SQLite default to etcd or an external datastore.

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