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Optimize Docker build with bind mounts #208

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db3d8f7
Optimize Docker build with bind mounts
Juneezee Apr 9, 2025
bc3a1cc
Remove `go mod download` step
Juneezee Apr 11, 2025
011ce96
Merge branch 'main' into docker
juruen Apr 12, 2025
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11 changes: 11 additions & 0 deletions .dockerignore
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
.github
.vscode
script
third-party
.dockerignore
.gitignore
**/*.yml
**/*.yaml
**/*.md
**/*_test.go
LICENSE
23 changes: 11 additions & 12 deletions Dockerfile
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Original file line number Diff line number Diff line change
@@ -1,27 +1,26 @@
FROM golang:1.23.7-alpine AS build
ARG VERSION="dev"

FROM golang:1.23.7 AS build
# allow this step access to build arg
ARG VERSION
# Set the working directory
WORKDIR /build

RUN go env -w GOMODCACHE=/root/.cache/go-build
# Install git
RUN --mount=type=cache,target=/var/cache/apk \
apk add git

# Install dependencies
COPY go.mod go.sum ./
RUN --mount=type=cache,target=/root/.cache/go-build go mod download

COPY . ./
# Build the server
RUN --mount=type=cache,target=/root/.cache/go-build CGO_ENABLED=0 go build -ldflags="-s -w -X main.version=${VERSION} -X main.commit=$(git rev-parse HEAD) -X main.date=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
-o github-mcp-server cmd/github-mcp-server/main.go
# go build automatically download required module dependencies to /go/pkg/mod
RUN --mount=type=cache,target=/go/pkg/mod \
--mount=type=cache,target=/root/.cache/go-build \
--mount=type=bind,target=. \
CGO_ENABLED=0 go build -ldflags="-s -w -X main.version=${VERSION} -X main.commit=$(git rev-parse HEAD) -X main.date=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
-o /bin/github-mcp-server cmd/github-mcp-server/main.go
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@Juneezee Juneezee Apr 11, 2025 •
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Size of GOMODCACHE with go mod download:

~/Desktop/github/github-mcp-server docker ❯ go clean -i -r -cache -modcache

~/Desktop/github/github-mcp-server docker ❯ go mod download

~/Desktop/github/github-mcp-server docker ❯ du -sh ~/go/pkg/mod
186M	/home/jun/go/pkg/mod

Size of GOMODCACHE with go build:

~/Desktop/github/github-mcp-server docker !1 ❯ go clean -i -r -cache -modcache

~/Desktop/github/github-mcp-server docker !1 ❯ CGO_ENABLED=0 go build -ldflags="-s -w" cmd/github-mcp-server/main.go
go: downloading github.com/spf13/viper v1.20.1
go: downloading github.com/mark3labs/mcp-go v0.18.0
go: downloading github.com/google/go-github/v69 v69.2.0
go: downloading github.com/sirupsen/logrus v1.9.3
go: downloading github.com/spf13/cobra v1.9.1
go: downloading golang.org/x/sys v0.31.0
go: downloading github.com/spf13/afero v1.14.0
go: downloading github.com/fsnotify/fsnotify v1.8.0
go: downloading github.com/spf13/cast v1.7.1
go: downloading github.com/go-viper/mapstructure/v2 v2.2.1
go: downloading github.com/subosito/gotenv v1.6.0
go: downloading gopkg.in/yaml.v3 v3.0.1
go: downloading github.com/spf13/pflag v1.0.6
go: downloading github.com/pelletier/go-toml/v2 v2.2.3
go: downloading github.com/sagikazarmark/locafero v0.9.0
go: downloading golang.org/x/text v0.23.0
go: downloading github.com/google/uuid v1.6.0
go: downloading github.com/yosida95/uritemplate/v3 v3.0.2
go: downloading github.com/sourcegraph/conc v0.3.0
go: downloading github.com/google/go-querystring v1.1.0

~/Desktop/github/github-mcp-server docker !1 ?1 ❯ du -sh ~/go/pkg/mod
80M	/home/jun/go/pkg/mod

Running go build results in a smaller GOMODCACHE (~80 MB) compared to go mod download (~186 MB). I found a great explanation on StackOverflow here: https://stackoverflow.com/a/68172023/7902371

The go build step took 19.1 seconds, which is 2 seconds faster than go mod download (4.1 seconds) + go build (17.1 seconds).

[+] Building 37.1s (13/13) FINISHED                                                                                                                            docker:default
 => [internal] load build definition from Dockerfile                                                                                                                     0.0s
 => => transferring dockerfile: 838B                                                                                                                                     0.0s
 => [internal] load metadata for gcr.io/distroless/base-debian12:latest                                                                                                  2.1s
 => [internal] load metadata for docker.io/library/golang:1.23.7-alpine                                                                                                  2.6s
 => [internal] load .dockerignore                                                                                                                                        0.0s
 => => transferring context: 148B                                                                                                                                        0.0s
 => [build 1/4] FROM docker.io/library/golang:1.23.7-alpine@sha256:e438c135c348bd7677fde18d1576c2f57f265d5dfa1a6b26fca975d4aa40b3bb                                     13.6s
 => => resolve docker.io/library/golang:1.23.7-alpine@sha256:e438c135c348bd7677fde18d1576c2f57f265d5dfa1a6b26fca975d4aa40b3bb                                            0.0s
 => => sha256:e291f2c3258d0d58c0a39814b55a8dfa54665485847a55af621f3370f12deccc 2.08kB / 2.08kB                                                                           0.0s
 => => sha256:e438c135c348bd7677fde18d1576c2f57f265d5dfa1a6b26fca975d4aa40b3bb 10.29kB / 10.29kB                                                                         0.0s
 => => sha256:44b3a1c80b6c3a3083df7893a996ecea1e45d4f4fd5682951b6a13569bdb64e3 1.92kB / 1.92kB                                                                           0.0s
 => => sha256:f18232174bc91741fdf3da96d85011092101a032a93a388b79e99e69c2d5c870 3.64MB / 3.64MB                                                                           3.2s
 => => sha256:4a6853717b24861f4773c7c44c0700bc67775e6432b117e9f6cb5d80c1259c40 294.90kB / 294.90kB                                                                       3.1s
 => => sha256:6ca661eb024f09b95cfdf77781effc26400df52d97566fbd0fd4d45a67c3a3e6 74.06MB / 74.06MB                                                                         4.8s
 => => sha256:d509c56e130243a89eef696356c0605801f3be8cf6ae8bb68ab53854704a178e 126B / 126B                                                                               3.5s
 => => extracting sha256:f18232174bc91741fdf3da96d85011092101a032a93a388b79e99e69c2d5c870                                                                                0.3s
 => => sha256:4f4fb700ef54461cfa02571ae0db9a0dc1e0cdb5577484a6d75e68dc38e8acc1 32B / 32B                                                                                 3.5s
 => => extracting sha256:4a6853717b24861f4773c7c44c0700bc67775e6432b117e9f6cb5d80c1259c40                                                                                0.1s
 => => extracting sha256:6ca661eb024f09b95cfdf77781effc26400df52d97566fbd0fd4d45a67c3a3e6                                                                                8.4s
 => => extracting sha256:d509c56e130243a89eef696356c0605801f3be8cf6ae8bb68ab53854704a178e                                                                                0.0s
 => => extracting sha256:4f4fb700ef54461cfa02571ae0db9a0dc1e0cdb5577484a6d75e68dc38e8acc1                                                                                0.0s
 => [internal] load build context                                                                                                                                        0.1s
 => => transferring context: 820.15kB                                                                                                                                    0.0s
 => [stage-1 1/3] FROM gcr.io/distroless/base-debian12:latest@sha256:27769871031f67460f1545a52dfacead6d18a9f197db77110cfc649ca2a91f44                                    3.3s
 => => resolve gcr.io/distroless/base-debian12:latest@sha256:27769871031f67460f1545a52dfacead6d18a9f197db77110cfc649ca2a91f44                                            0.0s
 => => sha256:dd32b4a5eed124ce1e86eab9959b67c9d6f114a1578a07cb679b2e3955d80b68 1.71kB / 1.71kB                                                                           0.0s
 => => sha256:3d78e577de35c8bf231e34862a13cde36cd7b253b6a7af2158035251d2dc48c0 104.23kB / 104.23kB                                                                       0.8s
 => => sha256:bfb59b82a9b65e47d485e53b3e815bca3b3e21a095bd0cb88ced9ac0b48062bf 13.36kB / 13.36kB                                                                         0.8s
 => => sha256:4eff9a62d888790350b2481ff4a4f38f9c94b3674d26b2f2c85ca39cdef43fd9 547.59kB / 547.59kB                                                                       0.9s
 => => sha256:d65201b3fe8eb56abcec05aec99acec815e40b10b63b854ce02bec4575f64526 2.27kB / 2.27kB                                                                           0.0s
 => => sha256:27769871031f67460f1545a52dfacead6d18a9f197db77110cfc649ca2a91f44 1.51kB / 1.51kB                                                                           0.0s
 => => extracting sha256:3d78e577de35c8bf231e34862a13cde36cd7b253b6a7af2158035251d2dc48c0                                                                                0.0s
 => => sha256:a62778643d563b511190663ef9a77c30d46d282facfdce4f3a7aecc03423c1f3 67B / 67B                                                                                 1.2s
 => => sha256:7c12895b777bcaa8ccae0605b4de635b68fc32d60fa08f421dc3818bf55ee212 188B / 188B                                                                               1.2s
 => => extracting sha256:bfb59b82a9b65e47d485e53b3e815bca3b3e21a095bd0cb88ced9ac0b48062bf                                                                                0.0s
 => => extracting sha256:4eff9a62d888790350b2481ff4a4f38f9c94b3674d26b2f2c85ca39cdef43fd9                                                                                0.3s
 => => sha256:3214acf345c0cc6bbdb56b698a41ccdefc624a09d6beb0d38b5de0b2303ecaf4 123B / 123B                                                                               1.4s
 => => extracting sha256:a62778643d563b511190663ef9a77c30d46d282facfdce4f3a7aecc03423c1f3                                                                                0.0s
 => => extracting sha256:7c12895b777bcaa8ccae0605b4de635b68fc32d60fa08f421dc3818bf55ee212                                                                                0.0s
 => => sha256:5664b15f108bf9436ce3312090a767300800edbbfd4511aa1a6d64357024d5dd 168B / 168B                                                                               1.6s
 => => sha256:0bab15eea81d0fe6ab56ebf5fba14e02c4c1775a7f7436fbddd3505add4e18fa 93B / 93B                                                                                 1.6s
 => => extracting sha256:3214acf345c0cc6bbdb56b698a41ccdefc624a09d6beb0d38b5de0b2303ecaf4                                                                                0.0s
 => => sha256:4aa0ea1413d37a58615488592a0b827ea4b2e48fa5a77cf707d0e35f025e613f 385B / 385B                                                                               1.8s
 => => extracting sha256:5664b15f108bf9436ce3312090a767300800edbbfd4511aa1a6d64357024d5dd                                                                                0.0s
 => => extracting sha256:0bab15eea81d0fe6ab56ebf5fba14e02c4c1775a7f7436fbddd3505add4e18fa                                                                                0.0s
 => => sha256:9aee425378d2c16cd44177dc54a274b312897f5860a8e78fdfda555a0d79dd71 130.50kB / 130.50kB                                                                       2.4s
 => => sha256:da7816fa955ea24533c388143c78804c28682eef99b4ee3723b548c70148bba6 321B / 321B                                                                               2.1s
 => => extracting sha256:4aa0ea1413d37a58615488592a0b827ea4b2e48fa5a77cf707d0e35f025e613f                                                                                0.0s
 => => sha256:d00c3209d92970dad10c006c4d7120e5fd276349ce6e57dbad95a3a3f05411fc 5.83MB / 5.83MB                                                                           2.6s
 => => extracting sha256:da7816fa955ea24533c388143c78804c28682eef99b4ee3723b548c70148bba6                                                                                0.0s
 => => sha256:221438ca359c95b5f7ecb07541b094ae1e5ce63442a404e8a38b6d84b6a7bcb4 2.83MB / 2.83MB                                                                           3.0s
 => => extracting sha256:9aee425378d2c16cd44177dc54a274b312897f5860a8e78fdfda555a0d79dd71                                                                                0.0s
 => => extracting sha256:d00c3209d92970dad10c006c4d7120e5fd276349ce6e57dbad95a3a3f05411fc                                                                                0.3s
 => => extracting sha256:221438ca359c95b5f7ecb07541b094ae1e5ce63442a404e8a38b6d84b6a7bcb4                                                                                0.2s
 => [stage-1 2/3] WORKDIR /server                                                                                                                                        0.0s
 => [build 2/4] WORKDIR /build                                                                                                                                           0.0s
 => [build 3/4] RUN --mount=type=cache,target=/var/cache/apk     apk add git                                                                                             1.6s
 => [build 4/4] RUN --mount=type=cache,target=/go/pkg/mod     --mount=type=cache,target=/root/.cache/go-build     --mount=type=bind,target=.     CGO_ENABLED=0 go buil  19.1s
 => [stage-1 3/3] COPY --from=build /bin/github-mcp-server .                                                                                                             0.0s
 => exporting to image                                                                                                                                                   0.1s
 => => exporting layers                                                                                                                                                  0.1s
 => => writing image sha256:b9ddd66d7962298abd8380c7f2eee5cc87b9f7b4919068da8b2641a42a0ede68                                                                             0.0s


# Make a stage to run the app
FROM gcr.io/distroless/base-debian12
# Set the working directory
WORKDIR /server
# Copy the binary from the build stage
COPY --from=build /build/github-mcp-server .
COPY --from=build /bin/github-mcp-server .
# Command to run the server
CMD ["./github-mcp-server", "stdio"]