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.