Optimize Docker build with bind mounts #208

Juneezee · 2025-04-09T18:45:08Z

This PR further optimize the Docker builds on top of PR #92 by introducing the following changes:

Add .dockerignore file to exclude non-source code files (https://docs.docker.com/build-cloud/optimization/#dockerignore-files).
Use Alpine image variant for build stage to reduce download size. golang:1.23.7-alpine is 200 MB smaller than golang:1.23.7.
Replace COPY instruction with RUN --mount=type=bind instruction in Dockerfile.

From https://docs.docker.com/build/building/best-practices/#add-or-copy:

If you need to add files from the build context to the container temporarily to execute a RUN instruction, you can often substitute the COPY instruction with a bind mount instead.
...
Bind mounts are more efficient than COPY for including files from the build context in the container.

From https://docs.docker.com/build/cache/optimize/#use-bind-mounts:

Using bind mounts is beneficial for build cache optimization because you're not adding unnecessary layers to the cache.

Before

7 build steps ([build 7/7]). Took 57.1 seconds to build with no cache.

~/Desktop/github/github-mcp-server main ❯ docker build .
[+] Building 57.1s (16/16) FINISHED                                                                                                                            docker:default
 => [internal] load build definition from Dockerfile                                                                                                                     0.0s
 => => transferring dockerfile: 889B                                                                                                                                     0.0s
 => [internal] load metadata for gcr.io/distroless/base-debian12:latest                                                                                                  2.4s
 => [internal] load metadata for docker.io/library/golang:1.23.7                                                                                                         1.8s
 => [internal] load .dockerignore                                                                                                                                        0.0s
 => => transferring context: 2B                                                                                                                                          0.0s
 => [build 1/7] FROM docker.io/library/golang:1.23.7@sha256:cb45cf739cf6bc9eaeacf75d3cd7c157e7d39b757216d813d8115d026ee32e75                                            32.8s
 => => resolve docker.io/library/golang:1.23.7@sha256:cb45cf739cf6bc9eaeacf75d3cd7c157e7d39b757216d813d8115d026ee32e75                                                   0.0s
 => => sha256:ada757ed641197da2ee830f9df447d1b596ca73d7edbc208f6859edf6dfdc333 2.32kB / 2.32kB                                                                           0.0s
 => => sha256:cb45cf739cf6bc9eaeacf75d3cd7c157e7d39b757216d813d8115d026ee32e75 10.06kB / 10.06kB                                                                         0.0s
 => => sha256:f7adae86ae48e99d064dc4ec807d0dbcfe9ea08fa2e3c0fcd23d64d10b6c8bcb 2.80kB / 2.80kB                                                                           0.0s
 => => sha256:7cd785773db44407e20a679ce5439222e505475eed5b99f1910eb2cda51729ab 48.47MB / 48.47MB                                                                         4.9s
 => => sha256:091eb8249475f42de217265c501e0186f0a3ea7490ef7f51458c30db91fb3cac 24.01MB / 24.01MB                                                                         4.3s
 => => sha256:255774e0027b72d2327719e78dbad5ad8c9cf446d055e45be7fc149418470bae 64.40MB / 64.40MB                                                                         6.4s
 => => sha256:3ce5bdf25c92d4d8858ada68e1e4a92b57b102468f815967ff197da4dd7103e2 92.33MB / 92.33MB                                                                         7.4s
 => => sha256:6ca661eb024f09b95cfdf77781effc26400df52d97566fbd0fd4d45a67c3a3e6 74.06MB / 74.06MB                                                                         7.5s
 => => extracting sha256:7cd785773db44407e20a679ce5439222e505475eed5b99f1910eb2cda51729ab                                                                                4.2s
 => => sha256:1b92dafdc82128962eacb8207282ffa7ad46d42a4e02866cc4ecfacebf8513b6 127B / 127B                                                                               6.7s
 => => sha256:4f4fb700ef54461cfa02571ae0db9a0dc1e0cdb5577484a6d75e68dc38e8acc1 32B / 32B                                                                                 7.0s
 => => extracting sha256:091eb8249475f42de217265c501e0186f0a3ea7490ef7f51458c30db91fb3cac                                                                                1.4s
 => => extracting sha256:255774e0027b72d2327719e78dbad5ad8c9cf446d055e45be7fc149418470bae                                                                                5.4s
 => => extracting sha256:3ce5bdf25c92d4d8858ada68e1e4a92b57b102468f815967ff197da4dd7103e2                                                                                6.4s
 => => extracting sha256:6ca661eb024f09b95cfdf77781effc26400df52d97566fbd0fd4d45a67c3a3e6                                                                                8.5s
 => => extracting sha256:1b92dafdc82128962eacb8207282ffa7ad46d42a4e02866cc4ecfacebf8513b6                                                                                0.0s
 => => extracting sha256:4f4fb700ef54461cfa02571ae0db9a0dc1e0cdb5577484a6d75e68dc38e8acc1                                                                                0.0s
 => [internal] load build context                                                                                                                                        0.1s
 => => transferring context: 1.07MB                                                                                                                                      0.0s
 => [stage-1 1/3] FROM gcr.io/distroless/base-debian12:latest@sha256:27769871031f67460f1545a52dfacead6d18a9f197db77110cfc649ca2a91f44                                    3.2s
 => => resolve gcr.io/distroless/base-debian12:latest@sha256:27769871031f67460f1545a52dfacead6d18a9f197db77110cfc649ca2a91f44                                            0.0s
 => => sha256:dd32b4a5eed124ce1e86eab9959b67c9d6f114a1578a07cb679b2e3955d80b68 1.71kB / 1.71kB                                                                           0.0s
 => => sha256:d65201b3fe8eb56abcec05aec99acec815e40b10b63b854ce02bec4575f64526 2.27kB / 2.27kB                                                                           0.0s
 => => sha256:27769871031f67460f1545a52dfacead6d18a9f197db77110cfc649ca2a91f44 1.51kB / 1.51kB                                                                           0.0s
 => => sha256:3d78e577de35c8bf231e34862a13cde36cd7b253b6a7af2158035251d2dc48c0 104.23kB / 104.23kB                                                                       0.8s
 => => sha256:bfb59b82a9b65e47d485e53b3e815bca3b3e21a095bd0cb88ced9ac0b48062bf 13.36kB / 13.36kB                                                                         0.8s
 => => sha256:4eff9a62d888790350b2481ff4a4f38f9c94b3674d26b2f2c85ca39cdef43fd9 547.59kB / 547.59kB                                                                       0.8s
 => => sha256:a62778643d563b511190663ef9a77c30d46d282facfdce4f3a7aecc03423c1f3 67B / 67B                                                                                 1.2s
 => => extracting sha256:3d78e577de35c8bf231e34862a13cde36cd7b253b6a7af2158035251d2dc48c0                                                                                0.0s
 => => extracting sha256:bfb59b82a9b65e47d485e53b3e815bca3b3e21a095bd0cb88ced9ac0b48062bf                                                                                0.0s
 => => extracting sha256:4eff9a62d888790350b2481ff4a4f38f9c94b3674d26b2f2c85ca39cdef43fd9                                                                                0.3s
 => => sha256:7c12895b777bcaa8ccae0605b4de635b68fc32d60fa08f421dc3818bf55ee212 188B / 188B                                                                               1.2s
 => => sha256:3214acf345c0cc6bbdb56b698a41ccdefc624a09d6beb0d38b5de0b2303ecaf4 123B / 123B                                                                               1.2s
 => => extracting sha256:a62778643d563b511190663ef9a77c30d46d282facfdce4f3a7aecc03423c1f3                                                                                0.0s
 => => extracting sha256:7c12895b777bcaa8ccae0605b4de635b68fc32d60fa08f421dc3818bf55ee212                                                                                0.0s
 => => extracting sha256:3214acf345c0cc6bbdb56b698a41ccdefc624a09d6beb0d38b5de0b2303ecaf4                                                                                0.0s
 => => sha256:0bab15eea81d0fe6ab56ebf5fba14e02c4c1775a7f7436fbddd3505add4e18fa 93B / 93B                                                                                 1.7s
 => => sha256:4aa0ea1413d37a58615488592a0b827ea4b2e48fa5a77cf707d0e35f025e613f 385B / 385B                                                                               1.7s
 => => sha256:5664b15f108bf9436ce3312090a767300800edbbfd4511aa1a6d64357024d5dd 168B / 168B                                                                               1.6s
 => => extracting sha256:5664b15f108bf9436ce3312090a767300800edbbfd4511aa1a6d64357024d5dd                                                                                0.0s
 => => extracting sha256:0bab15eea81d0fe6ab56ebf5fba14e02c4c1775a7f7436fbddd3505add4e18fa                                                                                0.0s
 => => extracting sha256:4aa0ea1413d37a58615488592a0b827ea4b2e48fa5a77cf707d0e35f025e613f                                                                                0.0s
 => => sha256:d00c3209d92970dad10c006c4d7120e5fd276349ce6e57dbad95a3a3f05411fc 5.83MB / 5.83MB                                                                           2.6s
 => => sha256:9aee425378d2c16cd44177dc54a274b312897f5860a8e78fdfda555a0d79dd71 130.50kB / 130.50kB                                                                       2.4s
 => => sha256:da7816fa955ea24533c388143c78804c28682eef99b4ee3723b548c70148bba6 321B / 321B                                                                               2.1s
 => => extracting sha256:da7816fa955ea24533c388143c78804c28682eef99b4ee3723b548c70148bba6                                                                                0.0s
 => => sha256:221438ca359c95b5f7ecb07541b094ae1e5ce63442a404e8a38b6d84b6a7bcb4 2.83MB / 2.83MB                                                                           2.9s
 => => extracting sha256:9aee425378d2c16cd44177dc54a274b312897f5860a8e78fdfda555a0d79dd71                                                                                0.0s
 => => extracting sha256:d00c3209d92970dad10c006c4d7120e5fd276349ce6e57dbad95a3a3f05411fc                                                                                0.3s
 => => extracting sha256:221438ca359c95b5f7ecb07541b094ae1e5ce63442a404e8a38b6d84b6a7bcb4                                                                                0.2s
 => [stage-1 2/3] WORKDIR /server                                                                                                                                        0.0s
 => [build 2/7] WORKDIR /build                                                                                                                                           0.0s
 => [build 3/7] RUN go env -w GOMODCACHE=/root/.cache/go-build                                                                                                           0.2s
 => [build 4/7] COPY go.mod go.sum ./                                                                                                                                    0.0s
 => [build 5/7] RUN --mount=type=cache,target=/root/.cache/go-build go mod download                                                                                      4.3s
 => [build 6/7] COPY . ./                                                                                                                                                0.1s
 => [build 7/7] RUN --mount=type=cache,target=/root/.cache/go-build CGO_ENABLED=0 go build -ldflags="-s -w -X main.version=dev -X main.commit=$(git rev-parse HEAD) -X  17.0s
 => [stage-1 3/3] COPY --from=build /build/github-mcp-server .                                                                                                           0.0s
 => exporting to image                                                                                                                                                   0.3s
 => => exporting layers                                                                                                                                                  0.3s
 => => writing image sha256:284cb1714a57d60ed29353cd0b596151723c905dc3726848783482af7c97dc42                                                                             0.0s

After

5 build steps ([build 5/5]). Took 38.9 seconds to build with no cache.

~/Desktop/github/github-mcp-server main ❯ docker build --no-cache .
[+] Building 38.9s (14/14) FINISHED                                                                                                                            docker:default
 => [internal] load build definition from Dockerfile                                                                                                                     0.0s
 => => transferring dockerfile: 1.03kB                                                                                                                                   0.0s
 => [internal] load metadata for gcr.io/distroless/base-debian12:latest                                                                                                  2.0s
 => [internal] load metadata for docker.io/library/golang:1.23.7-alpine                                                                                                  1.8s
 => [internal] load .dockerignore                                                                                                                                        0.0s
 => => transferring context: 148B                                                                                                                                        0.0s
 => [stage-1 1/3] FROM gcr.io/distroless/base-debian12:latest@sha256:27769871031f67460f1545a52dfacead6d18a9f197db77110cfc649ca2a91f44                                    3.4s
 => => resolve gcr.io/distroless/base-debian12:latest@sha256:27769871031f67460f1545a52dfacead6d18a9f197db77110cfc649ca2a91f44                                            0.0s
 => => sha256:d65201b3fe8eb56abcec05aec99acec815e40b10b63b854ce02bec4575f64526 2.27kB / 2.27kB                                                                           0.0s
 => => sha256:dd32b4a5eed124ce1e86eab9959b67c9d6f114a1578a07cb679b2e3955d80b68 1.71kB / 1.71kB                                                                           0.0s
 => => sha256:bfb59b82a9b65e47d485e53b3e815bca3b3e21a095bd0cb88ced9ac0b48062bf 13.36kB / 13.36kB                                                                         0.8s
 => => sha256:3d78e577de35c8bf231e34862a13cde36cd7b253b6a7af2158035251d2dc48c0 104.23kB / 104.23kB                                                                       0.8s
 => => sha256:27769871031f67460f1545a52dfacead6d18a9f197db77110cfc649ca2a91f44 1.51kB / 1.51kB                                                                           0.0s
 => => sha256:4eff9a62d888790350b2481ff4a4f38f9c94b3674d26b2f2c85ca39cdef43fd9 547.59kB / 547.59kB                                                                       1.0s
 => => extracting sha256:3d78e577de35c8bf231e34862a13cde36cd7b253b6a7af2158035251d2dc48c0                                                                                0.0s
 => => sha256:7c12895b777bcaa8ccae0605b4de635b68fc32d60fa08f421dc3818bf55ee212 188B / 188B                                                                               1.2s
 => => sha256:a62778643d563b511190663ef9a77c30d46d282facfdce4f3a7aecc03423c1f3 67B / 67B                                                                                 1.2s
 => => extracting sha256:bfb59b82a9b65e47d485e53b3e815bca3b3e21a095bd0cb88ced9ac0b48062bf                                                                                0.0s
 => => extracting sha256:4eff9a62d888790350b2481ff4a4f38f9c94b3674d26b2f2c85ca39cdef43fd9                                                                                0.3s
 => => sha256:3214acf345c0cc6bbdb56b698a41ccdefc624a09d6beb0d38b5de0b2303ecaf4 123B / 123B                                                                               1.4s
 => => sha256:0bab15eea81d0fe6ab56ebf5fba14e02c4c1775a7f7436fbddd3505add4e18fa 93B / 93B                                                                                 1.6s
 => => sha256:5664b15f108bf9436ce3312090a767300800edbbfd4511aa1a6d64357024d5dd 168B / 168B                                                                               1.6s
 => => extracting sha256:a62778643d563b511190663ef9a77c30d46d282facfdce4f3a7aecc03423c1f3                                                                                0.0s
 => => extracting sha256:7c12895b777bcaa8ccae0605b4de635b68fc32d60fa08f421dc3818bf55ee212                                                                                0.0s
 => => extracting sha256:3214acf345c0cc6bbdb56b698a41ccdefc624a09d6beb0d38b5de0b2303ecaf4                                                                                0.0s
 => => sha256:4aa0ea1413d37a58615488592a0b827ea4b2e48fa5a77cf707d0e35f025e613f 385B / 385B                                                                               1.9s
 => => extracting sha256:5664b15f108bf9436ce3312090a767300800edbbfd4511aa1a6d64357024d5dd                                                                                0.0s
 => => extracting sha256:0bab15eea81d0fe6ab56ebf5fba14e02c4c1775a7f7436fbddd3505add4e18fa                                                                                0.0s
 => => sha256:da7816fa955ea24533c388143c78804c28682eef99b4ee3723b548c70148bba6 321B / 321B                                                                               2.1s
 => => sha256:9aee425378d2c16cd44177dc54a274b312897f5860a8e78fdfda555a0d79dd71 130.50kB / 130.50kB                                                                       2.4s
 => => extracting sha256:4aa0ea1413d37a58615488592a0b827ea4b2e48fa5a77cf707d0e35f025e613f                                                                                0.0s
 => => sha256:d00c3209d92970dad10c006c4d7120e5fd276349ce6e57dbad95a3a3f05411fc 5.83MB / 5.83MB                                                                           2.7s
 => => extracting sha256:da7816fa955ea24533c388143c78804c28682eef99b4ee3723b548c70148bba6                                                                                0.0s
 => => sha256:221438ca359c95b5f7ecb07541b094ae1e5ce63442a404e8a38b6d84b6a7bcb4 2.83MB / 2.83MB                                                                           2.9s
 => => extracting sha256:9aee425378d2c16cd44177dc54a274b312897f5860a8e78fdfda555a0d79dd71                                                                                0.0s
 => => extracting sha256:d00c3209d92970dad10c006c4d7120e5fd276349ce6e57dbad95a3a3f05411fc                                                                                0.4s
 => => extracting sha256:221438ca359c95b5f7ecb07541b094ae1e5ce63442a404e8a38b6d84b6a7bcb4                                                                                0.2s
 => [build 1/5] FROM docker.io/library/golang:1.23.7-alpine@sha256:e438c135c348bd7677fde18d1576c2f57f265d5dfa1a6b26fca975d4aa40b3bb                                     13.3s
 => => resolve docker.io/library/golang:1.23.7-alpine@sha256:e438c135c348bd7677fde18d1576c2f57f265d5dfa1a6b26fca975d4aa40b3bb                                            0.0s
 => => sha256:e438c135c348bd7677fde18d1576c2f57f265d5dfa1a6b26fca975d4aa40b3bb 10.29kB / 10.29kB                                                                         0.0s
 => => sha256:44b3a1c80b6c3a3083df7893a996ecea1e45d4f4fd5682951b6a13569bdb64e3 1.92kB / 1.92kB                                                                           0.0s
 => => sha256:e291f2c3258d0d58c0a39814b55a8dfa54665485847a55af621f3370f12deccc 2.08kB / 2.08kB                                                                           0.0s
 => => sha256:f18232174bc91741fdf3da96d85011092101a032a93a388b79e99e69c2d5c870 3.64MB / 3.64MB                                                                           2.8s
 => => sha256:4a6853717b24861f4773c7c44c0700bc67775e6432b117e9f6cb5d80c1259c40 294.90kB / 294.90kB                                                                       3.0s
 => => extracting sha256:f18232174bc91741fdf3da96d85011092101a032a93a388b79e99e69c2d5c870                                                                                0.3s
 => => sha256:6ca661eb024f09b95cfdf77781effc26400df52d97566fbd0fd4d45a67c3a3e6 74.06MB / 74.06MB                                                                         4.5s
 => => sha256:d509c56e130243a89eef696356c0605801f3be8cf6ae8bb68ab53854704a178e 126B / 126B                                                                               3.6s
 => => sha256:4f4fb700ef54461cfa02571ae0db9a0dc1e0cdb5577484a6d75e68dc38e8acc1 32B / 32B                                                                                 3.6s
 => => extracting sha256:4a6853717b24861f4773c7c44c0700bc67775e6432b117e9f6cb5d80c1259c40                                                                                0.1s
 => => extracting sha256:6ca661eb024f09b95cfdf77781effc26400df52d97566fbd0fd4d45a67c3a3e6                                                                                8.4s
 => => extracting sha256:d509c56e130243a89eef696356c0605801f3be8cf6ae8bb68ab53854704a178e                                                                                0.0s
 => => extracting sha256:4f4fb700ef54461cfa02571ae0db9a0dc1e0cdb5577484a6d75e68dc38e8acc1                                                                                0.0s
 => [internal] load build context                                                                                                                                        0.0s
 => => transferring context: 745.13kB                                                                                                                                    0.0s
 => [stage-1 2/3] WORKDIR /server                                                                                                                                        0.0s
 => [build 2/5] WORKDIR /build                                                                                                                                           0.0s
 => [build 3/5] RUN --mount=type=cache,target=/var/cache/apk     apk add git                                                                                             2.1s
 => [build 4/5] RUN --mount=type=cache,target=/go/pkg/mod     --mount=type=bind,source=go.mod,target=go.mod     --mount=type=bind,source=go.sum,target=go.sum     go mo  4.1s
 => [build 5/5] 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  17.1s
 => [stage-1 3/3] COPY --from=build /bin/github-mcp-server .                                                                                                             0.0s
 => exporting to image                                                                                                                                                   0.1s
 => => exporting layers                                                                                                                                                  0.1s
 => => writing image sha256:2b4b94636e10adda967525c93d741a24ccf51bb556c1b96ccd9afd6b5db63e5c                                                                             0.0s

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This commit further optimize the Docker builds on top of PR github#92 with: 1. Add .dockerignore file to exclude non-source code files [1]. 2. Use Alpine image variant for build stage to reduce download size. golang:1.23.7-alpine is 200 MB smaller than golang:1.23.7 [2][3]. 3. Replace COPY instruction with RUN --mount=type=bind. Bind mounts do not add unnecessary layers to the cache [4][5]. [1]: https://docs.docker.com/build-cloud/optimization/#dockerignore-files [2]: https://hub.docker.com/layers/library/golang/1.23.7-alpine/images/sha256-333d4ba78773b3a3ae9cf2cff8962df56effc5c9481faa355f211abf2baf175c [3]: https://hub.docker.com/layers/library/golang/1.23.7/images/sha256-2087a99c3235972660b3d35c1564d9d1a3f639dcace9c790acbabc7e938d1570 [4]: https://docs.docker.com/build/building/best-practices/#add-or-copy [5]: https://docs.docker.com/build/cache/optimize/#use-bind-mounts Signed-off-by: Eng Zer Jun <[email protected]>

`go build` will automatically download module dependencies. In many cases, that is a much smaller set of modules than what is downloaded by `go mod download`. Size of GOMODCACHE with `go mod download: $ go clean -i -r -cache -modcache $ go mod download $ du -sh ~/go/pkg/mod 186M /home/jun/go/pkg/mod Size of GOMODCACHE with `go build`: $ go clean -i -r -cache -modcache $ 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 $ du -sh ~/go/pkg/mod 80M /home/jun/go/pkg/mod Reference: https://stackoverflow.com/a/68172023/7902371 Signed-off-by: Eng Zer Jun <[email protected]>

Juneezee · 2025-04-11T02:03:27Z

Dockerfile

-# 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


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

Copilot bot review requested due to automatic review settings April 9, 2025 18:45

Copilot AI reviewed Apr 9, 2025

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Juneezee force-pushed the docker branch from c9868e8 to db3d8f7 Compare April 10, 2025 11:59

Juneezee requested review from juruen, SamMorrowDrums, williammartin and toby as code owners April 10, 2025 11:59

Juneezee commented Apr 11, 2025

View reviewed changes

Merge branch 'main' into docker

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Optimize Docker build with bind mounts #208

Optimize Docker build with bind mounts #208

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