We have '/var/etcd/' in Dockerfile for historical reason. Most cases, user store data in '/var/lib/etcd/'.
@@ -3,6 +3,7 @@ FROM alpine:latest
ADD etcd /usr/local/bin/
ADD etcdctl /usr/local/bin/
RUN mkdir -p /var/etcd/
+RUN mkdir -p /var/lib/etcd/
EXPOSE 2379 2380