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go mod vendor
仅当依赖项在本地未准备就绪时,才从网络下载依赖项。否则,它只会将依赖项复制到没有访问网络的文件夹。因此,在这里,您的问题来自在多个构建期间未重用。vendor
go mod cache
作为解决方案,您可以使用 buildkit 缓存解决方案,接下来是一个最小示例:
主要.go:
package main
import _ "github.com/jeanphorn/log4go"
func main() {
}
Dockerfile:
# syntax = docker/dockerfile:1.3
FROM golang:1.14-alpine AS builder
RUN apk --update add git
ENV GO111MODULE=on
WORKDIR /app
COPY main.go /app
RUN go mod init hello
RUN --mount=type=cache,mode=0755,target=/go/pkg/mod go get github.com/go-delve/delve/cmd/dlv && go get github.com/jeanphorn/log4go
RUN --mount=type=cache,mode=0755,target=/go/pkg/mod go mod vendor
第一次执行:
$ export DOCKER_BUILDKIT=1
$ docker build --progress=plain -t abc:1 . --no-cache
#16 [builder 6/7] RUN --mount=type=cache,mode=0755,target=/go/pkg/mod go get github.com/go-delve/delve/cmd/dlv && go get github.com/jeanphorn/log4go
#16 sha256:ae394bc67787799808175eada48c5f4e09101b6e153d535ddb5e4040fbf74395
#16 1.941 go: downloading github.com/go-delve/delve v1.7.1
#16 4.296 go: found github.com/go-delve/delve/cmd/dlv in github.com/go-delve/delve v1.7.1
......
#16 23.78 go: finding module for package github.com/toolkits/file
#16 23.96 go: downloading github.com/toolkits/file v0.0.0-20160325033739-a5b3c5147e07
#16 24.17 go: found github.com/toolkits/file in github.com/toolkits/file v0.0.0-20160325033739-a5b3c5147e07
#16 DONE 27.3s
第二次执行:
$ export DOCKER_BUILDKIT=1
$ docker build --progress=plain -t abc:1 . --no-cache
#15 [builder 6/7] RUN --mount=type=cache,mode=0755,target=/go/pkg/mod go get github.com/go-delve/delve/cmd/dlv && go get github.com/jeanphorn/log4go
#15 sha256:bee74f92ceb79cce449b9702c892cb39815461981838f6b63d500414be87c21d
#15 1.467 go: found github.com/go-delve/delve/cmd/dlv in github.com/go-delve/delve v1.7.1
#15 7.511 go: github.com/jeanphorn/log4go upgrade => v0.0.0-20190526082429-7dbb8deb9468
#15 7.533 go: finding module for package github.com/toolkits/file
#15 7.675 go: found github.com/toolkits/file in github.com/toolkits/file v0.0.0-20160325033739-a5b3c5147e07
#15 DONE 8.7s
你可以看到第1次运行生成的已经被第二次运行重用,而无需从互联网下载,现在当你在主机上这样做时,它的效果是一样的。golang mod cache
注意:我没有建议将主机上的任何缓存直接绑定到容器,我认为它不是可移植的。
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