AWS Lambda 无法找到 app.handler（自定义 Docker 映像）

Question

我想在 AWS Lambda 函数上部署机器学习相关代码作为 Docker 映像。 AWS 为 Python 提供的基础镜像，不允许使用 apt-get 命令安装。所以我为 AWS Lambda 创建了自定义 docker 镜像。下面是我的 Dockerfile 的代码。

参考：Create an image from an alternative base image

ARG FUNCTION_DIR="/function"

FROM python:3.7-buster as build-image

# Install aws-lambda-cpp build dependencies
RUN apt-get update && \
  apt-get install -y \
  g++ \
  make \
  cmake \
  unzip \
  libcurl4-openssl-dev

RUN apt-get install -y python-opencv

# Include global arg in this stage of the build
ARG FUNCTION_DIR
# Create function directory
RUN mkdir -p ${FUNCTION_DIR}

# Install the runtime interface client
RUN pip install \
        --target ${FUNCTION_DIR} \
        awslambdaric

FROM python:3.7-buster

ARG FUNCTION_DIR
# Set working directory to function root directory
WORKDIR ${FUNCTION_DIR}

# Copy in the build image dependencies
COPY --from=build-image ${FUNCTION_DIR} ${FUNCTION_DIR}

COPY requirements.txt /
#RUN pip install -r /requirements.txt

COPY .  /function
ENV AWS_LAMBDA_RUNTIME_API=python3.7
ENTRYPOINT [ "/usr/local/bin/python", "-m", "awslambdaric" ]
CMD [ "app.handler" ]

我的文件夹结构如下：

aws_lambda (Folder)
- Dockerfile
- app.py
- function (Folder)
  - app.py
- requirements.txt

当我运行 docker image 时，它​​显示如下错误：

[ERROR] [1614258613176] LAMBDA_RUNTIME Failed to get next invocation. No Response from endpoint
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/local/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/function/awslambdaric/__main__.py", line 21, in <module>
    main(sys.argv)
  File "/function/awslambdaric/__main__.py", line 17, in main
    bootstrap.run(app_root, handler, lambda_runtime_api_addr)
  File "/function/awslambdaric/bootstrap.py", line 416, in run
    event_request = lambda_runtime_client.wait_next_invocation()
  File "/function/awslambdaric/lambda_runtime_client.py", line 76, in wait_next_invocation
    response_body, headers = runtime_client.next()
RuntimeError: Failed to get next
Executing 'app.handler' in function directory '/function'

似乎找不到/function目录，但它已经在那里了。

Answer 1

我最近遇到了这个问题，这对我有用。

我的码头文件：

ARG FUNCTION_DIR="/opt/myapp"

FROM ubuntu:16.04

RUN apt update \
    && apt upgrade \
    && apt-get install -y software-properties-common python-software-properties \
    && apt-add-repository -y ppa:deadsnakes/ppa \
    && apt update \
    && apt-get install -y python3.6 python3.6-dev python3-pip

RUN python3.6 -m pip --no-cache-dir install awslambdaric
ADD https://github.com/aws/aws-lambda-runtime-interface-emulator/releases/latest/download/aws-lambda-rie /usr/bin/aws-lambda-rie

ARG FUNCTION_DIR
RUN mkdir -p ${FUNCTION_DIR}
WORKDIR /opt
ADD myapp myapp
COPY entry.sh /opt/myapp/entry.sh
RUN chmod 755 /usr/bin/aws-lambda-rie /opt/myapp/entry.sh
WORKDIR /tmp
ENTRYPOINT [ "/opt/myapp/entry.sh" ]
CMD [ "/opt/myapp/app.handler" ]

我的入口点

#!/bin/sh

if [ -z "${AWS_LAMBDA_RUNTIME_API}" ]; then
    exec /usr/bin/aws-lambda-rie /usr/bin/python3.6 -m awslambdaric $1
else
    exec /usr/bin/python3.6 -m awslambdaric $1
fi

然后我构建了我的图像：

docker build --rm -t myimage .

并在本地运行测试：

docker run -p 9000:8080 --rm -it myimage:latest

在另一个终端我运行：

卷曲-XPOST “http://localhost:9000/2015-03-31/functions/function/invocations”-d '{"field1":"..", "field2":".."}'

细化开始。我的app.py 包含一个方法handler，它解析参数事件并检索字段（您可以在 curl 调用中看到它们），然后开始详细说明。我将我的工作目录设置在 /tmp 中，因为它是 AWS Lambda 中唯一的读/写文件夹，所以我可以在其中放置一些我阐述的中间文件。