> 本文作者：丁辉
>

# Nginx配置文件读取变量

## 方法一使用 Envsubst 渲染替换环境变量

1. 编辑 Dockerfile

   ```dockerfile
   FROM nginx:alpine-slim
   
   COPY ./nginx.conf.template /etc/nginx/conf.d/nginx.conf.template
   
   ENV PROXY_SERVER=default
   
   CMD /bin/sh -c "envsubst '\$PROXY_SERVER \$SERVER_NAME' < /etc/nginx/conf.d/nginx.conf.template > /etc/nginx/conf.d/default.conf && nginx -g 'daemon off;'"
   ```

2. 编辑 nginx.conf.template 文件

   ```bash
   vi nginx.conf.template
   ```

   内容如下

   ```nginx
   server {
       listen       80;
       server_name  ${SERVER_NAME};
   
       location / {
           proxy_pass http://${PROXY_SERVER}:3080;
           proxy_set_header Host $host;
           proxy_set_header X-Real-IP $remote_addr;
       }
   }
   ```

3. 构建镜像

   ```bash
   docker build -t <name:tag> .
   ```

4. 启动容器(指定变量)

   ```bash
   docker run -itd -e PROXY_SERVER=127.0.0.1 -e SERVER_NAME=localhost <name:tag>
   ```

## 方法二

**查看此文档**

[Nginx镜像构建](https://gitee.com/offends/Kubernetes/tree/main/Docker/Dockerfile/Nginx)