Newer
Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
# Dockerfile from https://github.com/chemidy/smallest-secured-golang-docker-image
##################################
# STEP 1 build executable binary #
##################################
FROM golang:alpine as builder
# Install git + SSL ca certificates.
# Git is required for fetching the dependencies.
# Ca-certificates is required to call HTTPS endpoints.
RUN apk update && apk add --no-cache git ca-certificates tzdata libcap mailcap && update-ca-certificates
# Create appuser
ENV USER=appuser
ENV UID=1000
# See https://stackoverflow.com/a/55757473/12429735
RUN adduser \
--disabled-password \
--gecos "" \
--home "/nonexistent" \
--shell "/sbin/nologin" \
--no-create-home \
--uid "${UID}" \
"${USER}"
WORKDIR /app
ADD . .
RUN chown -Rf "${UID}" ./*
# Get dependencies and run tests
RUN go version
RUN go get -d -v && \
CGO_ENABLED=0 go test ./...
# Build the binary
RUN CGO_ENABLED=0 go build \
-ldflags='-w -s -extldflags "-static"' -a \
-o /app/vestibule .
# Allow running on ports < 1000
RUN setcap cap_net_bind_service=+ep /app/vestibule
##############################
# STEP 2 build a small image #
##############################
FROM scratch
WORKDIR /app
# Import global resources from builder
COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /etc/passwd /etc/passwd
COPY --from=builder /etc/group /etc/group
COPY --from=builder /etc/mime.types /etc/mime.types
# Copy static executable and application resources
COPY --from=builder /app/vestibule /app/vestibule
COPY --from=builder /app/dev_certificates /app/dev_certificates
COPY --from=builder /app/web /app/web
COPY --from=builder /app/configs /app/configs
# Use an unprivileged user.
USER appuser:appuser
# Run the binary
ENTRYPOINT ["./vestibule"]