58bbffded4
At a high level, it switches us to a distroless base container image, but that also includes several related bits:
- Add a writable /tmp but make the rest of our filesystems read-only at runtime.
- Condense our main server binaries into a single pinniped-server binary. This saves a bunch of space in
the image due to duplicated library code. The correct behavior is dispatched based on `os.Args[0]`, and
the `pinniped-server` binary is symlinked to `pinniped-concierge` and `pinniped-supervisor`.
- Strip debug symbols from our binaries. These aren't really useful in a distroless image anyway and all the
normal stuff you'd expect to work, such as stack traces, still does.
- Add a separate `pinniped-concierge-kube-cert-agent` binary with "sleep" and "print" functionality instead of
using builtin /bin/sleep and /bin/cat for the kube-cert-agent. This is split from the main server binary
because the loading/init time of the main server binary was too large for the tiny resource footprint we
established in our kube-cert-agent PodSpec. Using a separate binary eliminates this issue and the extra
binary adds only around 1.5MiB of image size.
- Switch the kube-cert-agent code to use a JSON `{"tls.crt": "<b64 cert>", "tls.key": "<b64 key>"}` format.
This is more robust to unexpected input formatting than the old code, which simply concatenated the files
with some extra newlines and split on whitespace.
- Update integration tests that made now-invalid assumptions about the `pinniped-server` image.
Signed-off-by: Matt Moyer <moyerm@vmware.com>
40 lines
1.6 KiB
Docker
40 lines
1.6 KiB
Docker
# syntax = docker/dockerfile:1.0-experimental
|
|
|
|
# Copyright 2020-2021 the Pinniped contributors. All Rights Reserved.
|
|
# SPDX-License-Identifier: Apache-2.0
|
|
|
|
FROM golang:1.16.6 as build-env
|
|
|
|
WORKDIR /work
|
|
COPY . .
|
|
ARG GOPROXY
|
|
|
|
# Build the executable binary (CGO_ENABLED=0 means static linking)
|
|
# Pass in GOCACHE (build cache) and GOMODCACHE (module cache) so they
|
|
# can be re-used between image builds.
|
|
RUN \
|
|
--mount=type=cache,target=/cache/gocache \
|
|
--mount=type=cache,target=/cache/gomodcache \
|
|
mkdir out && \
|
|
export GOCACHE=/cache/gocache GOMODCACHE=/cache/gomodcache CGO_ENABLED=0 GOOS=linux GOARCH=amd64 && \
|
|
go build -v -ldflags "$(hack/get-ldflags.sh) -w -s" -o /usr/local/bin/pinniped-concierge-kube-cert-agent ./cmd/pinniped-concierge-kube-cert-agent/main.go && \
|
|
go build -v -ldflags "$(hack/get-ldflags.sh) -w -s" -o /usr/local/bin/pinniped-server ./cmd/pinniped-server/main.go && \
|
|
ln -s /usr/local/bin/pinniped-server /usr/local/bin/pinniped-concierge && \
|
|
ln -s /usr/local/bin/pinniped-server /usr/local/bin/pinniped-supervisor && \
|
|
ln -s /usr/local/bin/pinniped-server /usr/local/bin/local-user-authenticator
|
|
|
|
# Use a distroless runtime image with CA certificates, timezone data, and not much else.
|
|
FROM gcr.io/distroless/static:nonroot@sha256:c9f9b040044cc23e1088772814532d90adadfa1b86dcba17d07cb567db18dc4e
|
|
|
|
# Copy the server binary from the build-env stage.
|
|
COPY --from=build-env /usr/local/bin /usr/local/bin
|
|
|
|
# Document the ports
|
|
EXPOSE 8080 8443
|
|
|
|
# Run as non-root for security posture
|
|
USER 1001:1001
|
|
|
|
# Set the entrypoint
|
|
ENTRYPOINT ["/usr/local/bin/pinniped-server"]
|