etcd/Documentation/op-guide/supported-platform.md

Supported platform

32-bit and other unsupported systems

etcd has known issues on 32-bit systems due to a bug in the Go runtime. See #358 for more information.

To avoid inadvertently running a possibly unstable etcd server, etcd on unsupported architectures will print a warning message and immediately exit if the environment variable ETCD_UNSUPPORTED_ARCH is not set to the target architecture.

Currently only the amd64 architecture is officially supported by etcd.