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Docker: drop alpine (#1843)

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* Docker: drop alpine

Create a multistage docker build image that uses debian to install certs
and then create the final image by using FROM: scratch. This creates a
(slightly) smaller images and drops busybox and alpine.

* Even less copying
This commit is contained in:
Miek Gieben
2018-06-04 19:20:21 +01:00
committed by GitHub
parent 70a53e25c9
commit a77d9834d8
1 changed files with 6 additions and 3 deletions
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9
Dockerfile
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@@ -1,8 +1,11 @@
FROM alpine:latest
FROM debian:stable-slim
# Only need ca-certificates & openssl if want to use DNS over TLS (RFC 7858).
RUN apk --no-cache add bind-tools ca-certificates openssl && update-ca-certificates
RUN apt-get update && apt-get -uy upgrade
RUN apt-get -y install ca-certificates && update-ca-certificates
FROM scratch
COPY --from=0 /etc/ssl/certs /etc/ssl/certs
ADD coredns /coredns
EXPOSE 53 53/udp