如何在Docker运行期间将k8s的ENV变量提供给python应用 [英] How to provide ENV variable from k8s to a python app during the docker run
问题描述
我有一个docker文件，在构建过程中将其注入应用程序时，我现在正在对该环境变量进行硬编码。现在，我想在运行时在应用程序在k8s pod中运行时注入它们。我尝试了此，但是它不起作用。以下是我的docker文件。这是我第一次使用严肃的python，并且不确定如何修复它。
I have a docker file in which I am hardcoding the env variables for now as it gets injected in the app during the build process. Now, I want to inject those during the runtime when the application gets ran in the k8s pod. I tried this but its not working. Below is my docker file. Its my first time using serious python and am not sure how to fix it.
FROM python:3.7-slim AS build
WORKDIR /app
COPY . .
RUN python3 setup.py bdist_wheel
#ENV USE_DB="True" \
# DB_USERNAME= \
# DB_HOST= \
# DB_PASSWORD= \
# DB_DB=sth
RUN pip3 install dist/app_search*.whl && \
semanticsearch-preprocess
FROM python:3.7-slim
WORKDIR /opt/srv
COPY --from=build /app/dist/app_search*.whl /opt/srv/
COPY --from=build /tmp/projects* /opt/srv/
# set environment variables to /opt/srv
ENV DICT_FILE="/opt/srv/projects.dict" \
MODEL_FILE="/opt/srv/projects.model.cpickle" \
INDEX_FILE="/opt/srv/projects.index" \
EXTERNAL_INDEX_FILE="/opt/srv/projects.mm.metadata.cpickle"
RUN pip3 install waitress && \
pip3 install app_search*.whl
EXPOSE 5000
ENTRYPOINT [ "waitress-serve" ]
CMD [ "--call", "app_search.app:main" ]
推荐答案
您可以使用pod将env变量传递给k8s pod规范字段： env 。
You can pass env variables to k8s pod with pod spec field: env.
从k8s文档中查找以下示例：
Look a the following example from k8s docs:
apiVersion: v1
kind: Pod
metadata:
name: envar-demo
labels:
purpose: demonstrate-envars
spec:
containers:
- name: envar-demo-container
image: gcr.io/google-samples/node-hello:1.0
env:
- name: DEMO_GREETING
value: "Hello from the environment"
- name: DEMO_FAREWELL
value: "Such a sweet sorrow"
也可以查看k8s文档以获取更多信息：
Also take a look at k8s documentaion for more information:
- k8s api spec reference
- defining environment variables
- using secrets as environment variables
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