无法替换Dockerfile中的nginx环境变量
无法替换Dockerfile中的nginx环境变量
提问于 2019-05-08 05:24:30
在nginx的docker构建期间，我正在传递REST API的端点作为环境变量，并且花了6个小时尝试了大多数建议，我已经没有耐心去尝试了。
nginx conf，我用它替换：
location /my-api/ {
proxy_pass ${api_url}/;
}我在docker构建过程中传递了这个值：
#base_url comes from system env
docker build --build-arg base_api_url=$base_url我在我的Dockerfile中获得了这个值：
ARG base_api_url
ENV api_url=$base_api_url
# This prints the value
RUN echo "api_url= ${api_url}" .
COPY package.json /usr/src/app/package.json
RUN npm install
COPY . /usr/src/app
RUN npm run build
FROM nginx:1.15.8-alpine
COPY --from=builder /usr/src/app/build /usr/share/nginx/html
EXPOSE 80
# this works
COPY nginx.conf /etc/nginx/nginx.conf.template
# Initially following code was building and deploying docker image and url was hard coded. it was working
# COPY nginx.conf /etc/nginx/conf.d/default.conf
# Below will start the image but no REST endpoint configured
# CMD ["nginx", "-g", "daemon off;"]
# To substitute the api url few of the many things I have tried.
# Non of the below, have been able to replace the env api_url with its value
# Actually I don't know -- since /etc/nginx/conf.d/default.conf is not replaced at all
# CMD /bin/bash -c "envsubst < nginx.conf > /etc/nginx/conf.d/default.conf && exec nginx -g 'daemon off;'"
# CMD /bin/sh -c "envsubst < nginx.conf > /etc/nginx/conf.d/default.conf && nginx -g 'daemon off;' || cat /etc/nginx/nginx.conf"
# Last status
CMD envsubst < /etc/nginx/nginx.conf.template > /etc/nginx/conf.d/default.conf && exec nginx -g 'daemon off;'/etc/nginx/conf.d/default.conf应该替换api_url：
location /my-api/ {
proxy_pass http://theApiURL;
}我也尝试过像这样专门传递env变量：
CMD envsubst ${api_url} < /etc/nginx/nginx.conf.template > /etc/nginx/conf.d/default.conf && exec nginx -g 'daemon off;'还有一些变体，比如使用tee。
任何帮助/指导来解决这个问题的人都将不胜感激。
回答 1
Stack Overflow用户
发布于 2019-05-08 05:43:48
我通常在Dockerfile之外使用sed在部署脚本中执行此操作。
下面是一个例子：
#!/usr/bin/env bash
# Deploys locally for dev work
set -e
export API_URL=www.theapiurl.com
sed "s/api_url/${API_URL}/" nginx.conf.template > nginx.conf
...
# run docker
docker-compose build --no-cache
docker-compose up -d当然，您可以设置环境变量，但是对于您的用例是有意义的。我发现这种方法比Docker提供的任何东西都灵活得多。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56030655
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