# corosync/corosync

The Corosync Cluster Engine

Repository: https://github.com/corosync/corosync
Canonical: https://ross.abutalabs.com/products/corosync
Homepage: https://corosync.github.io/corosync/
Language: C
License: NOASSERTION
License Family: other
Last push: 2026-08-19T15:39:22+00:00

## Health v2 (maintenance only)
Score: 73/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 25, longevity 100
- inputs: {"age_days": 5581, "days_push": 14, "days_rel": 291, "gap_med": 365, "n_releases_24m": 2}
- flags: no_license, no_readme
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1218, forks 228 (observed 2026-08-28T04:04:01.639581+00:00)

## What it is
Corosync is a C-based Group Communication System providing a closed process group communication model with virtual synchrony guarantees, plus availability management, a configuration/statistics database, and quorum services. It serves as the messaging and membership layer for high-availability clusters, most notably as the underlying engine for Pacemaker.

## Use cases
- build replicated state machines with virtual synchrony guarantees
- implement high-availability clustering on Linux
- detect node failures and manage cluster membership
- manage quorum in a cluster of servers
- run a Pacemaker-based HA cluster
- restart failed application processes automatically
- share configuration and statistics across cluster nodes

## When to choose
- you need a proven cluster communication and membership layer for Linux HA
- you are deploying Pacemaker or another HA stack that requires Corosync
- you need quorum enforcement and node failure notification in C applications

## When to avoid
- you need a simple single-node service manager like systemd
- you want a cloud-managed orchestration solution rather than self-managed clustering
- your application is not on Linux or does not need cluster-level guarantees

## Facets
- artifact type: library
- maturity: active
- function: message-queue, monitoring, configuration-management, concurrency
- domain: microservices, infrastructure-as-code
- platform: cpp, c, self-hosted
- tags: cluster-engine, group-communication, virtual-synchrony, quorum, high-availability, pacemaker, clustering, devops, linux

## Member repositories
- corosync/corosync (main) score 73

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:01.639581+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 2026-08-30T06:17:03.038310+00:00, confidence not recorded.
  - homepage: https://corosync.github.io/corosync/ (fetched 2026-08-29T12:24:35.261231+00:00, sha 78879c97e453)
- Data as of 2026-08-30T08:39:29.467469+00:00.