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python - AWS Lambda Alpine Python Container 显示 IMAGE Launch 错误 exec 格式错误

问题描述

我正在编写一个 Lambda 函数来使用 unoconv 和 libreoffice 将 excel 文件转换为 PDF，为此我使用的是 alpine 基础图像。Dockerfile 如下。

# Define global args
ARG FUNCTION_DIR="/home/app/"
ARG RUNTIME_VERSION="3.9"
ARG DISTRO_VERSION="3.12"

# Stage 1 - bundle base image + runtime
# Grab a fresh copy of the image and install GCC
FROM python:${RUNTIME_VERSION}-alpine${DISTRO_VERSION} AS python-alpine
# Install GCC (Alpine uses musl but we compile and link dependencies with GCC)
RUN apk add --no-cache \
    libstdc++

# Stage 2 - build function and dependencies
FROM python-alpine AS build-image
# Install aws-lambda-cpp build dependencies
RUN apk add --no-cache \
    build-base \
    libtool \
    autoconf \
    automake \
    libexecinfo-dev \
    make \
    cmake \
    libcurl
# Include global args in this stage of the build
ARG FUNCTION_DIR
ARG RUNTIME_VERSION
# Create function directory
RUN mkdir -p ${FUNCTION_DIR}
# Copy handler function
COPY app.py ${FUNCTION_DIR}
COPY requirements.txt ${FUNCTION_DIR}
# Optional – Install the function's dependencies
RUN python${RUNTIME_VERSION} -m pip install -r /home/app/requirements.txt --target ${FUNCTION_DIR}
# Install Lambda Runtime Interface Client for Python
RUN python${RUNTIME_VERSION} -m pip install awslambdaric --target ${FUNCTION_DIR}

# Stage 3 - final runtime image
# Grab a fresh copy of the Python image
FROM python-alpine
# Include global arg in this stage of the build
ARG FUNCTION_DIR
# Set working directory to function root directory
WORKDIR ${FUNCTION_DIR}
# Copy in the built dependencies
COPY --from=build-image ${FUNCTION_DIR} ${FUNCTION_DIR}

#
ARG PUID=1000
ARG PGID=1000
#
RUN set -xe \
    && apk add --no-cache --purge -uU \
        curl icu-libs unzip zlib-dev musl \
        mesa-gl mesa-dri-swrast \
        libreoffice libreoffice-base libreoffice-lang-uk \
        ttf-freefont ttf-opensans ttf-ubuntu-font-family ttf-inconsolata \
    ttf-liberation ttf-dejavu \
        libstdc++ dbus-x11 \
    && echo "http://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories \
    && echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories \
    && echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories \
    && apk add --no-cache -U \
    ttf-font-awesome ttf-mononoki ttf-hack \
    && rm -rf /var/cache/apk/* /tmp/*

RUN pip install unoconv

# (Optional) Add Lambda Runtime Interface Emulator and use a script in the ENTRYPOINT for simpler local runs
ADD https://github.com/aws/aws-lambda-runtime-interface-emulator/releases/latest/download/aws-lambda-rie /usr/bin/aws-lambda-rie
COPY entry.sh /
RUN chmod 755 /usr/bin/aws-lambda-rie /entry.sh
ENTRYPOINT [ "/entry.sh" ]
CMD [ "app.handler" ]

entry.sh 文件内容如下。

#!/bin/sh
if [ -z "${AWS_LAMBDA_RUNTIME_API}" ]; then
    exec /usr/bin/aws-lambda-rie /usr/local/bin/python -m awslambdaric $1
else
    exec /usr/local/bin/python -m awslambdaric $1
fi

requirements.txt 文件内容如下。

unotools
unoconv
boto3

app.py 文件内容如下。

import sys
import boto3
import subprocess
import json

def handler(event, context):       
    bucketname = "somebucket"
    filename = "Sample/example.xlsx"
    outputfilename = filename.rsplit('.', 1)[0] + '.pdf'

    s3 = boto3.client('s3')

    try:
        s3.download_file(bucketname, filename, "file.xlsx")
    except Exception as e:
        return str(e)

    try:
        result = subprocess.run(['unoconv', '-f', 'pdf', "file.xlsx"], stdout=subprocess.PIPE)
    except Exception as e:
        return str(e)

    try:
        with open("file.pdf", "rb") as f:
            s3.upload_fileobj(f, bucketname, outputfilename)
    except Exception as e:
        return str(e)

    body = {
        "message": "Converted excel to pdf"        
    }
    response = {
        "statusCode": 200,
        "event": json.dumps(event),
        "body": json.dumps(body),
        "path": "app.py"
    }
    return response

我构建了这个容器并在本地运行容器，这没有问题。但是，当我将图像推送到 ECR 并使用新的最新图像更新功能并运行测试时，它会显示此错误。

{
  "errorMessage": "RequestId: SOME_ID_HERE Error: fork/exec /usr/local/bin/python awslambdaric: no such file or directory",
  "errorType": "Runtime.InvalidEntrypoint"
}
IMAGE   Launch error: fork/exec /usr/local/bin/python awslambdaric: no such file or directory   Entrypoint: [/usr/local/bin/python awslambdaric]    Cmd: [app.handler]  WorkingDir: [/home/app/]

查看错误，我认为这与架构有关。有人可以帮助我了解导致问题的原因吗？

标签： pythondockeraws-lambdaalpineunoconv

解决方案

问题出在架构上，我在 Mac Mini M1 上构建图像。当我使用提供 --platform=linux/amd64 选项构建图像时，错误消失了。当然，Lambda 函数中唯一可写的文件夹是 /tmp，所以我也必须更改它才能正常工作。

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