# sealerio/sealer

Build, Share and Run Both Your Kubernetes Cluster and Distributed Applications  (Project under CNCF)

Repository: https://github.com/sealerio/sealer
Canonical: https://ross.abutalabs.com/products/sealer
Homepage: http://sealer.cool
Language: Go
License: Apache-2.0
License Family: permissive
Topics: kubernetes, docker, installer, golang, cloud-native, isv, k8s, kubernetes-deployment, registry, delivery-service, distributed-systems, operations, package, clusterimage
Last push: 2025-06-03T08:29:24+00:00

## Health v2 (maintenance only)
Score: 34/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 24, release rhythm 8, longevity 100
- inputs: {"age_days": 1952, "days_push": 456, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2095, forks 357 (observed 2026-08-28T04:06:13.235339+00:00)

## What it is
Sealer is a CNCF CLI tool that packages a Kubernetes cluster together with all application dependencies (container images, YAML manifests, Helm charts) into a single ClusterImage built from a Kubefile. It then runs, shares, scales, and upgrades those clusters via a Clusterfile, similar to how Docker handles container images.

## Use cases
- package a kubernetes cluster and apps into a single image
- deploy kubernetes in an air-gapped environment
- deliver distributed applications as one artifact
- install a k8s cluster offline in minutes
- scale or upgrade a kubernetes cluster declaratively
- share a full cluster image through a registry

## When to avoid
- you only need plain container image builds (use Docker/BuildKit)
- you manage clusters with existing tools like kubeadm, kops, or Terraform and don't need image packaging
- you need managed Kubernetes rather than self-installed clusters

## Facets
- artifact type: cli-tool
- maturity: active
- function: deployment, container-runtime, infrastructure-as-code, cli
- domain: cloud-computing, microservices, self-hosted
- platform: cli, go, cross-platform
- tags: kubernetes, clusterimage, kubefile, clusterfile, application-delivery, cncf, air-gapped, installer, containers, devops, linux

## Member repositories
- sealerio/sealer (main) score 34

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:13.235339+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:55:24.463720+00:00, confidence not recorded.
  - readme: https://github.com/sealerio/sealer (fetched 2026-08-28T04:06:13.235339+00:00, sha 417f5be3a740)
- Data as of 2026-08-30T08:39:29.467469+00:00.