Dockerfile

FROM alpine:3.12

RUN apk add --no-cache ca-certificates mailcap

RUN set -eux; \
	mkdir -p \
		/config/caddy \
		/data/caddy \
		/etc/caddy \
		/usr/share/caddy \
	; \
	wget -O /etc/caddy/Caddyfile "https://github.com/caddyserver/dist/raw/506330b23c5cce43a9352179e7977a684678fbaf/config/Caddyfile"; \
	wget -O /usr/share/caddy/index.html "https://github.com/caddyserver/dist/raw/506330b23c5cce43a9352179e7977a684678fbaf/welcome/index.html"

# https://github.com/caddyserver/caddy/releases
ENV CADDY_VERSION v2.1.1

RUN set -eux; \
	apkArch="$(apk --print-arch)"; \
	case "$apkArch" in \
		x86_64)  binArch='amd64'; checksum='41f2442c52daf5a36d07af5024711072925997d8b5a7bd459994b000cfee1cb63d0c97d1b54b172c59b6b02a0f0eab285141a8cd3fc23cbca684f824c7b21b75' ;; \
		armhf)   binArch='armv6'; checksum='91b69356155b4909feec8c4e5674a52d13c75b5c4bedfa3c7be2615a18cecbb58212de753d288ecd355502412d33bde9beed713055263636039ee4c47466ca90' ;; \
		armv7)   binArch='armv7'; checksum='e45d8c8ac9fab83a26660531ef117dd0fbcaf81e442bb01f0d068afda6c507e692105e0c7f5fb86f227cf7693bff12b63647377e72571dc98c2dd0b6a7d76d81' ;; \
		aarch64) binArch='arm64'; checksum='8d9d873e701ab2dfe6046c5f6a9bbd19dd2aef7e4c57640c897e70cc5d2775353f0c467779e2fba4c024c9de89d2b1d64c1b46568dda65e6f5a114f13b239c6d' ;; \
		ppc64el|ppc64le) binArch='ppc64le'; checksum='30248cca16ec07e1e9aee0dabaaf0959f2f3622aafbdd9dac9135a4f2117ca3cc5b5bbfb8c94d45ea2c1abf61840587885f2db7fec420cd00918819cd39bfc92' ;; \
		s390x)   binArch='s390x'; checksum='f4e16ad4f03f13cbe463efb8577d99f22a30161916cde10f5a0c838f7c57022b572b9a18d25fb20925aef4a5366537948ffdd4a191b3d5205ab9ab980406ca4b' ;; \
		*) echo >&2 "error: unsupported architecture ($apkArch)"; exit 1 ;;\
	esac; \
	wget -O /tmp/caddy.tar.gz "https://github.com/caddyserver/caddy/releases/download/v2.1.1/caddy_2.1.1_linux_${binArch}.tar.gz"; \
	echo "$checksum  /tmp/caddy.tar.gz" | sha512sum -c; \
	tar x -z -f /tmp/caddy.tar.gz -C /usr/bin caddy; \
	rm -f /tmp/caddy.tar.gz; \
	chmod +x /usr/bin/caddy; \
	caddy version

# set up nsswitch.conf for Go's "netgo" implementation
# - https://github.com/docker-library/golang/blob/1eb096131592bcbc90aa3b97471811c798a93573/1.14/alpine3.12/Dockerfile#L9
RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf

# See https://caddyserver.com/docs/conventions#file-locations for details
ENV XDG_CONFIG_HOME /config
ENV XDG_DATA_HOME /data

VOLUME /config
VOLUME /data

LABEL org.opencontainers.image.version=v2.1.1
LABEL org.opencontainers.image.title=Caddy
LABEL org.opencontainers.image.description="a powerful, enterprise-ready, open source web server with automatic HTTPS written in Go"
LABEL org.opencontainers.image.url=https://caddyserver.com
LABEL org.opencontainers.image.documentation=https://caddyserver.com/docs
LABEL org.opencontainers.image.vendor="Light Code Labs"
LABEL org.opencontainers.image.licenses=Apache-2.0
LABEL org.opencontainers.image.source="https://github.com/caddyserver/caddy-docker"

EXPOSE 80
EXPOSE 443
EXPOSE 2019

WORKDIR /srv

CMD ["caddy", "run", "--config", "/etc/caddy/Caddyfile", "--adapter", "caddyfile"]