use alpine as runtime image

Dockerfile

@@ -1,14 +1,22 @@
-FROM golang:latest
-LABEL maintainer="Boshi Lian<farmer1992@gmail.com>"
+FROM golang:latest as builder
 
-RUN apt-get update && apt-get install -y libpam0g-dev libpam-google-authenticator
+RUN apt-get update && apt-get install -y libpam0g-dev
 
 ADD . /go/src/github.com/tg123/sshpiper/
 RUN go install -ldflags "$(/go/src/github.com/tg123/sshpiper/sshpiperd/ldflags.sh)" -tags pam github.com/tg123/sshpiper/sshpiperd
 
-EXPOSE 2222
+
+FROM alpine:latest 
+LABEL maintainer="Boshi Lian<farmer1992@gmail.com>"
+
+RUN mkdir /lib64 && ln -s /lib/libc.musl-x86_64.so.1 /lib64/ld-linux-x86-64.so.2
+RUN apk add google-authenticator
+
+RUN mkdir /etc/ssh/
 
 ADD entrypoint.sh /
-ENTRYPOINT ["/entrypoint.sh"]
+COPY --from=builder /go/bin/sshpiperd /
+EXPOSE 2222
 
-CMD ["/go/bin/sshpiperd", "daemon"]
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["/sshpiperd", "daemon"]

entrypoint.sh

@@ -1,9 +1,9 @@
-#!/bin/bash
+#!/bin/sh
 set -euo pipefail
 
 
 if [ ! -f /etc/ssh/ssh_host_rsa_key ];then
-    ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
+    /sshpiperd genkey > /etc/ssh/ssh_host_rsa_key
 fi
 
 exec "$@"