在 AWS Lambda 上部署应用程序时出现错误 [重复]答案

【问题标题】：I get errors when I deploy my app on AWS Lambda [duplicate]在 AWS Lambda 上部署应用程序时出现错误 [重复]
【发布时间】：2021-06-10 15:46:23
【问题描述】：

我正在尝试在 AWS lambda 上运行我的烧瓶 API，使用 serverless framework 进行部署。

当我使用 sls wsgi serve 时，我的应用程序在本地运行良好，但在部署到 AWS Lambda 时出现错误 (502 bad gateway)：

021-03-12T16:26:21.213+01:00    START RequestId: deedf3d6-eb1e-4f02-ac0c-47428c5bd553 Version: $LATEST

2021-03-12T16:26:21.216+01:00   module initialization error: Unable to import app.app

2021-03-12T16:26:21.331+01:00   END RequestId: deedf3b6-eb1e-4f02-ac0c-47428c5bd553

2021-03-12T16:26:21.331+01:00   REPORT RequestId: deedf3b6-eb1e-4f02-ac0c-47428c5bd553 Duration: 115.30 ms Billed Duration: 116 ms Memory Size: 1024 MB Max Memory Used: 28 MB

2021-03-12T16:26:21.331+01:00   module initialization error Unable to import app.app

2021-03-12T16:26:22.072+01:00   Traceback (most recent call last):

2021-03-12T16:26:22.072+01:00   File "/var/task/wsgi_handler.py", line 44, in import_app

2021-03-12T16:26:22.072+01:00   wsgi_module = importlib.import_module(wsgi_fqn_parts[-1])

2021-03-12T16:26:22.072+01:00   File "/var/lang/lib/python3.6/importlib/__init__.py", line 126, in import_module

2021-03-12T16:26:22.072+01:00   return _bootstrap._gcd_import(name[level:], package, level)

2021-03-12T16:26:22.072+01:00   File "<frozen importlib._bootstrap>", line 994, in _gcd_import

2021-03-12T16:26:22.072+01:00

Copy
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 971, in _find_and_load

2021-03-12T16:26:22.072+01:00   File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked

2021-03-12T16:26:22.072+01:00   File "<frozen importlib._bootstrap>", line 665, in _load_unlocked

2021-03-12T16:26:22.072+01:00   File "<frozen importlib._bootstrap_external>", line 678, in exec_module

2021-03-12T16:26:22.072+01:00   File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed

2021-03-12T16:26:22.072+01:00   File "/var/task/app.py", line 10, in <module>

2021-03-12T16:26:22.072+01:00   from common.helpers import *

2021-03-12T16:26:22.072+01:00   File "/var/task/common/helpers.py", line 1, in <module>

2021-03-12T16:26:22.072+01:00   from common.db import db

2021-03-12T16:26:22.072+01:00   File "/var/task/common/db.py", line 1, in <module>

2021-03-12T16:26:22.072+01:00   from flask_pymongo import pymongo

2021-03-12T16:26:22.072+01:00   ModuleNotFoundError: No module named 'flask_pymongo'

我有两个单独的文件 app.py 和 db.py，其中导入了 Flask_pymongo。

这是我的DockerFile

FROM lambci/lambda:build-python3.6
RUN pip3 --no-cache-dir install -r requirements.txt

requirements.txt：

Werkzeug==0.16.1
Flask_PyMongo==2.3.0
Flask==1.1.1
Flask_Limiter==1.3.1
Flask_JWT_Extended==3.22.0
pymongo==3.10.1
pymongo[tls,srv]
dnspython

还有我的serverless.yml

service : my-flask-app
provider:
  name: aws
  runtime: python3.6
  stage: dev
  region: us-east-1
plugins:
  - serverless-wsgi
  - serverless-python-requirements
custom:
  wsgi:
    app: app.app
    packRequirements: false
    pythonBin: python3
  pythonRequirements:
    dockerizePip: non-linux
    dockerFile: ./Dockerfile
package:
  exclude:
    - node_modules/**
    - venv/**
functions:
  app:
    handler: wsgi_handler.handler
    events:
      - http: ANY /
      - http: 'ANY {proxy+}'

有什么建议吗？

【问题讨论】：

标签： python flask aws-lambda serverless-framework serverless

【解决方案1】：

我认为您的 Dockerfile 不正确，您没有复制 requirements.txt 让 pip 为您安装软件包，因为没有打包依赖项。应该是这样的

FROM lambci/lambda:build-python3.6
COPY requirements.txt requirements.txt
RUN pip3 --no-cache-dir install -r requirements.txt

你的Dockerfile 给出了这个错误：

Step 2/2 : RUN pip3 --no-cache-dir install -r requirements.txt
 ---> Running in 1cda237064f0
ERROR: Could not open requirements file: [Errno 2] No such file or directory: 'requirements.txt'

我不确定您在部署应用时是否在构建日志中注意到了这一点。

还有一件事，假设您使用的是serverless-python-requirements 而不是任何其他变体，您不应该将requirements.txt 直接包含在您的Dockerfile 中。

  pythonRequirements:
    dockerizePip: non-linux
    dockerFile: ./Dockerfile

Dockerfile

FROM lambci/lambda:build-python3.6
# Install your dependencies in case you want to install any
#RUN yum -y install myfavourite-pacakge

此配置将采用Dockerfile 并将requirements.txt 添加到其中。

Native Code Dependencies During Build

Cross Compiling

【讨论】：