我有一個(gè)工作正常的 docker 文件。但是要遠(yuǎn)程調(diào)試它，我讀到我需要在它上面安裝dlv然后我需要運(yùn)行 dlv 并傳遞我正在嘗試調(diào)試的應(yīng)用程序的參數(shù)。因此，在其上安裝 dlv 并嘗試運(yùn)行它之后。我得到錯(cuò)誤exec /dlv: no such file or directory這是泊塢窗文件 FROM golang:1.18-alpine AS builder# Build Delve for debuggingRUN go install github.com/go-delve/delve/cmd/dlv@latest# Create and change to the app directory.WORKDIR /appENV CGO_ENABLED=0# Retrieve application dependencies.COPY go.* ./RUN go mod download# Copy local code to the container image.COPY . ./# Build the binary.RUN go build -gcflags="all=-N -l" -o fooapp# Use the official Debian slim image for a lean production container.FROM debian:buster-slimEXPOSE 8000 40000RUN set -x && apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \ ca-certificates && \ rm -rf /var/lib/apt/lists/*# Copy the binary to the production image from the builder stage.#COPY --from=builder /app/fooapp /app/fooapp #commented this out COPY --from=builder /go/bin/dlv /dlv# Run dlv as pass fooapp as parameterCMD ["/dlv", "--listen=:40000", "--headless=true", "--api-version=2", "--accept-multiclient", "exec", "/app/fooapp"]以上結(jié)果exec /dlv: no such file or directory我不確定為什么會(huì)這樣。作為 docker 的新手，我嘗試了不同的方法來(lái)調(diào)試它。我試著用它dive來(lái)檢查圖像是否dlv在路徑中/dlv，它確實(shí)如此。我還附上了它的圖片
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一只萌萌小番薯
TA貢獻(xiàn)1795條經(jīng)驗(yàn) 獲得超7個(gè)贊
您構(gòu)建了dlv基于alpine- 的發(fā)行版。dlv可執(zhí)行文件鏈接到libc.musl：
# ldd dlv
linux-vdso.so.1 (0x00007ffcd251d000)
libc.musl-x86_64.so.1 => not found
但是后來(lái)你切換到glibc基于圖像debian:buster-slim。該圖像沒(méi)有所需的庫(kù)。
# find / -name libc.musl*
<nothing found>
這就是您無(wú)法執(zhí)行的原因dlv- 動(dòng)態(tài)鏈接器無(wú)法找到正確的庫(kù)。
您需要構(gòu)建glibc基于 - 的 docker。例如，替換第一行
FROM golang:bullseye AS builder
順便提一句。構(gòu)建后，您需要以特權(quán)模式運(yùn)行容器
$ docker build . -t try-dlv
...
$ docker run --privileged --rm try-dlv
API server listening at: [::]:40000
2022-10-30T10:51:02Z warning layer=rpc Listening for remote connections (connections are not authenticated nor encrypted)
在非特權(quán)容器中dlv不允許產(chǎn)生子進(jìn)程。
$ docker run --rm try-dlv
API server listening at: [::]:40000
2022-10-30T10:55:46Z warning layer=rpc Listening for remote connections (connections are not authenticated nor encrypted)
could not launch process: fork/exec /app/fooapp: operation not permitted
真正最小的圖像
你用來(lái)debian:buster-slim最小化圖像，它的大小是 80 MB。但是如果你需要一個(gè)非常小的圖像，使用busybox，它只有 4.86 MB 的開(kāi)銷。
FROM golang:bullseye AS builder
# Build Delve for debugging
RUN go install github.com/go-delve/delve/cmd/dlv@latest
# Create and change to the app directory.
WORKDIR /app
ENV CGO_ENABLED=0
# Retrieve application dependencies.
COPY go.* ./
RUN go mod download
# Copy local code to the container image.
COPY . ./
# Build the binary.
RUN go build -o fooapp .
# Download certificates
RUN set -x && apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
ca-certificates
# Use the official Debian slim image for a lean production container.
FROM busybox:glibc
EXPOSE 8000 40000
# Copy the binary to the production image from the builder stage.
COPY --from=builder /app/fooapp /app/fooapp
# COPY --from=builder /app/ /app
COPY --from=builder /go/bin/dlv /dlv
COPY --from=builder /etc/ssl /etc/ssl
# Run dlv as pass fooapp as parameter
CMD ["/dlv", "--listen=:40000", "--headless=true", "--api-version=2", "--accept-multiclient", "exec", "/app/fooapp"]
# ENTRYPOINT ["/bin/sh"]
圖像大小為 25 MB，其中 18 MB 來(lái)自應(yīng)用程序dlv，2 MB 來(lái)自Hello World應(yīng)用程序。
在選擇圖像時(shí)，應(yīng)注意具有相同風(fēng)格的libc. golang:bullseye針對(duì)glibc. 因此，最小圖像必須glibc基于。
但是，如果您想要更舒適一些，請(qǐng)使用已安裝的alpine軟件包gcompat。與busybox.
FROM golang:bullseye AS builder
# Build Delve for debugging
RUN go install github.com/go-delve/delve/cmd/dlv@latest
# Create and change to the app directory.
WORKDIR /app
ENV CGO_ENABLED=0
# Copy local code to the container image.
COPY . ./
# Retrieve application dependencies.
RUN go mod tidy
# Build the binary.
RUN go build -o fooapp .
# Use alpine lean production container.
# FROM busybox:glibc
FROM alpine:latest
# gcompat is the package to glibc-based apps
# ca-certificates contains trusted TLS CA certs
# bash is just for the comfort, I hate /bin/sh
RUN apk add gcompat ca-certificates bash
EXPOSE 8000 40000
# Copy the binary to the production image from the builder stage.
COPY --from=builder /app/fooapp /app/fooapp
# COPY --from=builder /app/ /app
COPY --from=builder /go/bin/dlv /dlv
# Run dlv as pass fooapp as parameter
CMD ["/dlv", "--listen=:40000", "--headless=true", "--api-version=2", "--accept-multiclient", "exec", "/app/fooapp"]
# ENTRYPOINT ["/bin/bash"]
開(kāi)心每一天1111
TA貢獻(xiàn)1836條經(jīng)驗(yàn) 獲得超13個(gè)贊
長(zhǎng)話短說(shuō)
運(yùn)行apt-get install musl，然后/dlv應(yīng)該按預(yù)期工作。
解釋
按著這些次序：
docker run -it <image-name> shapt-get install filefile /dlv
然后你可以看到如下輸出：
/dlv: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-musl-x86_64.so.1, Go BuildID=xV8RHgfpp-zlDlpElKQb/DOLzpvO_A6CJb7sj1Nxf/aCHlNjW4ruS1RXQUbuCC/JgrF83mgm55ntjRnBpHH, not stripped
令人困惑no such file or directory（有關(guān)相關(guān)討論，請(qǐng)參閱此問(wèn)題）是由 missing 引起的/lib/ld-musl-x86_64.so.1。
因此，解決方案是musl按照其文檔安裝庫(kù)。
我的回答是受這個(gè)答案的啟發(fā)。
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