Docker生成副本失败

我使用的是来自golang:alpine的build docker图像

我的目的只是将执行的二进制文件复制到一个新的暂存映像

下面是我的Dockerfile：

############################
# STEP 1 build executable binary
############################
FROM golang@sha256:d481168873b7516b9f34d322615d589fafb166ff5fd57d93e96f64787a58887c AS builder

RUN apk update && apk add --no-cache git tzdata ca-certificates && update-ca-certificates

ADD . $GOPATH/src/piggybank2go
WORKDIR $GOPATH/src/piggybank2go
COPY . .

# Fetch dependencies.
RUN go get -u github.com/golang/dep/cmd/dep
RUN dep ensure -v

# Build executeable binary
RUN GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o $GOPATH/bin/piggybank2go
# RUN go build -o /go/bin/piggybank2go

############################
# STEP 2 build a small image
############################
FROM scratch

# Copy our static executable
COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder $GOPATH/bin/piggybank2go $GOPATH/bin/piggybank2go

# Port on which the service will be exposed.
EXPOSE 8081

ENTRYPOINT ["$GOPATH/bin/piggybank2go"]

但我有一个错误：

Step 12/14 : COPY --from=builder $GOPATH/bin/piggybank2go $GOPATH/bin/piggybank2go
COPY failed: stat /var/lib/docker/overlay2/b37bbe725b51ba50e3082d162e75d4cdee368499e26887c6921486415c089920/merged/bin/piggybank2go: no such file or directory

---

我认为问题在于环境变量

$GOPATH

只存在于golang图像中，而不存在于scratch图像中。因此，请尝试将

COPY

-行更改为：

COPY --from=builder /go/bin/piggybank2go /go/bin/piggybank2go

COPY --from=builder /go/bin/piggybank2go /go/bin/piggybank2go

---

第一阶段中的环境变量在第二阶段中不可用。因此，无法在第二阶段正确解析“$GOPATH”，因此出现错误

在第二阶段中，您应该确切地知道要复制的内容和位置：