Applications

The repo ships three end-user binaries plus two operational modes built into the same etcd executable.

Binary	Source	Role
etcd	main.go → server/main.go → server/etcdmain/etcd.go	Cluster member; default mode
etcd gateway start	server/etcdmain/gateway.go	Stateless TCP load balancer toward an etcd cluster
etcd grpc-proxy start	server/etcdmain/grpc_proxy.go, server/proxy/grpcproxy/	Caching gRPC proxy that consolidates client connections
etcdctl	etcdctl/main.go → etcdctl/ctlv3/	gRPC client CLI
etcdutl	etcdutl/main.go	Offline data-file utility (no cluster needed)

Pages

• etcd server — the main binary, including gateway and grpc-proxy modes.
• etcdctl — the v3 client CLI.
• etcdutl — the offline utility.

How they fit together

graph LR
    subgraph user[Operator / Developer]
        ctl[etcdctl]
        utl[etcdutl]
    end
    subgraph cluster[etcd cluster]
        m1[etcd member 1]
        m2[etcd member 2]
        m3[etcd member 3]
    end
    proxy[etcd grpc-proxy]
    gw[etcd gateway]

    ctl -->|gRPC| proxy
    ctl -->|gRPC| m1
    proxy -->|gRPC fan-out| m1
    proxy -->|gRPC fan-out| m2
    proxy -->|gRPC fan-out| m3
    gw -->|TCP| m1
    gw -->|TCP| m2
    utl -.->|reads/writes data files| m1