Consul Service Mesh and Discovery

This service networking tool enables services to securely connect across any cloud or runtime and discover each other through a distributed, highly available service registry and health checking system. Created by HashiCorp in 2014 by Armon Dadgar and Mitchell Hashimoto, the project has over 28,000 stars as of 2026 and is used by major enterprises for service discovery, configuration management, and service mesh. Key features include: service discovery (services register themselves and discover other services via DNS or HTTP interface, with automatic health checking and removal of unhealthy instances), health checking (HTTP, TCP, UDP, script, Docker, and TTL health checks with configurable intervals and timeouts, automatically routing traffic away from failing instances), KV store (distributed key-value store with long-polling for watch-based configuration updates), service mesh (L7 traffic management with intentions-based authorization, mutual TLS between services, and traffic splitting for canary deployments), service segmentation (network-level security with intention-based access control, restricting which services can communicate), multi-datacenter federation (WAN gossip protocol connecting multiple datacenters into a single federation for cross-region service discovery), DNS interface (standard DNS resolution of service names to healthy IP addresses with SRV records for port information), Raft consensus (strongly consistent state via leader election and log replication), watch (long-polling notifications for KV changes, service registration, and health state transitions), prepared queries (predefined complex DNS queries with failover and nearest-node routing), and ACL system (token-based access control with policy inheritance for multi-tenant security).