Docker 容器与 golang http.Get 错误“证书由未知机构签名”

Question

我有一个带有 Golang 的容器，它调用 https api。我正在使用暂存容器，当我尝试运行时，我得到一个certificate signed by unknown authority

url := "https://restcountries.eu/rest/v2/name/" + params.Get("country")
response, err := http.Get(url)

我的 Dockerfile 是这样的：

FROM golang:1.15 AS builder
WORKDIR /GreetingAPI
COPY . /greeting
WORKDIR /greeting
ENV GO111MODULE=on
RUN CGO_ENABLED=0 GOOS=linux go build -o greeting

FROM scratch
COPY --from=builder /greeting .
CMD ["./greeting"]

我使用这个answare更新了我的 Dockerfile 。但是当我尝试构建容器时，我得到 ERROR: "/ca-certificates.crt" not found: not found了failed to solve: rpc error: code = Unknown desc = failed to compute cache key: "/ca-certificates.crt" not found: not found

FROM golang:1.15 AS builder
WORKDIR /GreetingAPI
COPY . /greeting
WORKDIR /greeting
ENV GO111MODULE=on
RUN CGO_ENABLED=0 GOOS=linux go build -o greeting

FROM scratch
ADD ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /greeting .
CMD ["./greeting"]

Answer 1

我可能需要在链接的答案中更清楚地说明，第一个示例中的副本是一个单阶段示例，其中您有一个证书文件要注入到构建上下文中（通常包含 Dockerfile 的目录）：

FROM scratch
ADD ca-certificates.crt /etc/ssl/certs/
ADD main /
CMD ["/main"]

您有一个多阶段构建，可以遵循链接答案后半部分的多阶段方法。这会在发行版供应商的另一个阶段安装证书，并将它们复制到您的临时阶段：

FROM golang:alpine as build
RUN apk --no-cache add ca-certificates
WORKDIR /go/src/app
COPY . .
RUN CGO_ENABLED=0 go-wrapper install -ldflags '-extldflags "-static"'

FROM scratch
COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=build /go/bin/app /app
ENTRYPOINT ["/app"]

然而，第二个示例假设 Alpine 作为第一阶段的基础，使用 apk。（它还假设证书需要安装在基础镜像中，但事实证明当前的 golang 镜像中并非如此。）对于您的示例，它基于镜像中的 Debian golang:1.15。为此，您通常需要apt-get命令，但在这种情况下，ca-certificates软件包已经安装，因此您只需复制结果即可：

FROM golang:1.15 AS builder
COPY . /greeting
WORKDIR /greeting
ENV GO111MODULE=on
RUN CGO_ENABLED=0 GOOS=linux go build -o greeting

FROM scratch
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /greeting /
CMD ["/greeting"]