Build from scratch

Signed-off-by: Liam Newman <[email protected]>

README.md

@@ -27,19 +27,12 @@ The following files are added (taken from Debian) to fix some common issues:
 - `/etc/services` : for named ports resolution
 - `/lib/x86_64-linux-gnu/libpthread.so.0` : common required lib for project binaries that cannot be statically built.
 
-### prom/busybox:alpine-glibc : glibc
+### prom/busybox:alpine : musl-libc
 
-Based on the official `busybox:glibc` base image.
+Based on the official `alpine:latest` base image.
 
 The `busybox` executable is replaced by the [statically linked busybox](https://pkgs.alpinelinux.org/package/v3.16/main/x86_64/busybox-static) from `alpine:latest`.
-The Alpine project provides far more timely security patches to `busybox` that the official `busybox` release. No other parts of Alpine are needed or used in this image.
-
-The following files are added (taken from Debian) to fix some common issues:
-
-- `/etc/ssl/certs/ca-certificates.crt` : for HTTPS support
-- `/usr/share/zoneinfo` : for timezones
-- `/etc/services` : for named ports resolution
-- `/lib/x86_64-linux-gnu/libpthread.so.0` : common required lib for project binaries that cannot be statically built.
+The Alpine project provides far more timely security patches to `busybox` that the official `busybox` release.
 
 ## Build Docker images locally
 

alpine/Dockerfile

@@ -0,0 +1,25 @@
+ARG ARCH=""
+FROM        ${ARCH}alpine:latest as alpine
+
+RUN apk upgrade -U && \
+    apk add tzdata ca-certificates busybox-static
+
+# remove extra package
+RUN apk del libc-utils
+
+# remove apk files and directories
+RUN apk del apk-tools && \
+    find / -name apk -prune -exec rm -rf {} ";"
+
+# Use the busybox.static to avoid dynamic library dependencies.
+RUN mv /bin/busybox.static /bin/busybox && \
+    /bin/busybox --install -s /bin
+
+# remove extraneous folders
+RUN rm -rf media mnt opt run srv
+
+FROM        scratch
+MAINTAINER  The Prometheus Authors <[email protected]>
+
+COPY --from=alpine / /
+