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docker - 基于环境变量的nginx条件代理传递

问题描述

我想根据环境变量有条件地将proxy_pass传递给相关服务。我的意思是，prox_pass地址应该根据NODE_ENV变量进行更改。

这样做的最佳方法是什么？我可以使用如下 if 语句作为 proxy_pass 吗？如果是，我应该怎么做？除此之外，我尝试如下创建一个 bash 以将环境变量传递给 nginx，但无法以$NGINX_BACKEND_ADDRESS某种方式设置并传递给 nginx conf。任何帮助将不胜感激

   if ($NODE_ENV == "development) {
       proxy_pass http://myservice-dev;
   }

nginx.conf

server {
    listen  3000;
    location / {
        root /usr/src/app;
        index  index.html index.htm;
        try_files $uri $uri/ /index.html;
    }
    location /csrf/token {
        proxy_pass ${NGINX_BACKEND_ADDRESS}/csrf/token;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
    location /export/apis {
        proxy_pass ${NGINX_BACKEND_ADDRESS}/export/apis;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

入口点.sh

#!/usr/bin/env sh
set -eu
export NODE_ENV=development
if ["$NODE_ENV" == "development"]
then
    export NGINX_BACKEND_ADDRESS=http://backend-dev
elif ["$NODE_ENV" == "stage"]
then
    export NGINX_BACKEND_ADDRESS=http://backend-stage
elif ["$NODE_ENV" == "development"
then
    export NGINX_BACKEND_ADDRESS=http://backend-preprod
elif ["$NODE_ENV" == "development"]
then
    export NGINX_BACKEND_ADDRESS=http://backend
else 
    echo "Error in reading environment variable in nginx-conf.sh."
fi
echo "Will proxy requests for  to ${NGINX_BACKEND_ADDRESS}*"
exec /nginx-conf.sh "$@"

Dockerfile

FROM nginx:alpine AS production-build
WORKDIR /usr/src/app
ARG NODE_ENVIRONMENT=development
ENV NODE_ENV=$NODE_ENVIRONMENT
RUN rm /etc/nginx/conf.d/default.conf
COPY nginx/nginx.conf.template /etc/nginx/conf.d/default.conf.template
COPY nginx-conf.sh /
RUN chgrp -R root /var/cache/nginx /var/run /var/log/nginx /var/run/nginx.pid && \
    chmod -R 775 /var/cache/nginx /var/run /var/log/nginx /var/run/nginx.pid
USER nginx
COPY --from=builder /usr/src/app/dist .
ENTRYPOINT ["/nginx-conf.sh", $NODE_ENVIRONMENT]
EXPOSE 3000
CMD ["nginx", "-g", "daemon off;"]

标签： dockernginx

解决方案

Docker Hubnginx映像（截至nginx:1.19）具有在配置文件中进行环境变量替换的功能：

[...] 这个图像有一个函数，它将在 nginx 启动之前提取环境变量。[...] 此函数读取模板文件/etc/nginx/templates/*.template并将执行结果输出envsubst到/etc/nginx/conf.d.

因此，您的第一步是将配置文件原样（包括proxy_pass ${NGINX_BACKEND_ADDRESS}/...）重命名为类似的名称default.conf.template，并将其放在所需的目录中。

我会直接在您的部署时配置中传递该地址。我不会以任何方式将它包含在图像中。（想象一下“开发人员试图在他们的本地桌面系统上运行这个堆栈”这样的设置，其中入口点脚本中的 URL 都不正确。）这也可以让你摆脱这里的几乎所有代码；你就会有

# Dockerfile
FROM ... AS builder
...
FROM nginx:1.21-alpine
COPY nginx/nginx.conf.template /etc/nginx/conf.d/default.conf.template
COPY --from=builder /usr/src/app/dist /usr/share/nginx/html
# Permissions, filesystem layout, _etc._ are fine in the base image
# Use the base image's ENTRYPOINT/CMD

# docker-compose.yml
version: '3.8'
services:
  proxy:
    build: .
    ports: ['8000:80']
    environment:
      - NGINX_BACKEND_ADDRESS=https://backend-prod.example.com

如果您实际上正在使用 Compose，则可以使用多个docker-compose.yml文件来为特定环境提供设置。

# docker-compose.local.yml
# Run the backend service locally too in development mode
version: '3.8'
services:
  backend: # not in docker-compose.yml
    build: backend
    # and other settings as required
  nginx: # overrides docker-compose.yml settings
    environment:
      - NGINX_BACKEND_ADDRESS=http://backend
    # no other settings

docker-compose -f docker-compose.yml -f docker-compose.local.yml up

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