Cloud · head to head
K3s vs Vault
K3s
Cloud
Lightweight certified Kubernetes distribution in a single binary
- From
- Free
- Rated
- -
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; Vault vault 1.15.0 and later is licensed under the Business Source License 1.1, not an OSI open source licence, with IBM Corporation as licensor
- They diverge on capability: K3s covers Single binary, Vault covers Secrets management.
Where they differ
Only the attributes on which K3s and Vault actually diverge.
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 Vault
- Secrets management
- Encryption
- Authentication
- Authorization
- Audit logging
- API access
- High availability
- Replication
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 Vault
- Development and CI clusters that must start fast and cost nothingnot Vault
- Small production clusters where full Kubernetes is more operations than the workload justifiesnot Vault
- Teaching and learning Kubernetes without cloud spendnot Vault
Vault
- Centrally storing and rotating secrets, API keys and database credentialsnot K3s
- Issuing short-lived dynamic credentials to applications instead of static passwordsnot K3s
- Encryption as a service and PKI certificate issuancenot 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
Vault
- Vault 1.15.0 and later is licensed under the Business Source License 1.1, not an OSI open source licence, with IBM Corporation as licensor
- The Additional Use Grant forbids offering Vault to third parties on a hosted or embedded basis in a paid product that competes with IBM's paid versions of Vault
- Each version only converts to MPL 2.0 four years after that version is published, and the Change Date is tracked per version
- Replication, HSM support, namespaces, performance standby nodes, FIPS builds, control group authorisation, multi-factor authentication, secrets sync and lease count quotas all require a Vault Enterprise licence
- A Vault Enterprise licence must be applied to the cluster before any Enterprise feature can be used
Pricing, plan by plan
K3s
Free- K3sFree
- Full functionality
- No usage limits
- Community support
Vault
Free- Open SourceFree
- Secrets management
- Encryption as a service
- Identity management
- EnterpriseFree
- Advanced features
- Premium support
- Dedicated updates
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.
Choose Vault if
- You need secrets management.
- You want to start without paying.
- You work on Linux, Windows, Mac, Cloud.
- You also want encryption.
Questions people ask
- Is K3s or Vault better?
- Neither clearly leads. K3s starts at Free and Vault at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, K3s or Vault?
- K3s starts at Free and Vault at Free.
- Does K3s or Vault run on more platforms?
- K3s runs on Linux, ARM, Self-hosted. Vault runs on Linux, Windows, Mac, Cloud.
- 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 Vault is typically brought in for.
- What can K3s do that Vault cannot?
- K3s covers Single binary, SQLite by default, Certified conformant, Batteries included. Vault covers Secrets management, Encryption, Authentication, Authorization.
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.
Vault: Is HashiCorp Vault free to use?
Yes, Vault is available as a free, open-source project. The community version includes secrets management, certificate generation and rotation, encryption services, and credential management. Vault Enterprise is a commercial offering with additional features.
SourceK3s: Is K3s real Kubernetes?
Yes. It is CNCF-certified conformant, so standard manifests, kubectl and Helm charts work without modification.
Vault: What are the differences between open-source Vault and Vault Enterprise?
Open-source Vault is free and self-hosted. Vault Enterprise includes additional features and commercial support. HashiCorp also offers Vault Dedicated on the HashiCorp Cloud Platform as a fully managed cloud option.
SourceK3s: 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.
Vault: Can I try HashiCorp Cloud Platform Vault without payment?
Yes, HashiCorp offers a free trial option for HCP Vault Dedicated. New users also receive a $500 credit to use across HashiCorp Cloud Platform services.
SourceK3s: 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.
Vault: What does Vault manage and protect?
Vault provides identity-based secrets management for users, machines, services, and AI agents. It automates authentication and authorization for access to secrets, passwords, certificates, encryption keys, and other sensitive data across your infrastructure.
SourceRelated pages
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