[英]Use docker-compose service names in Nginx config
I have an application with 4 services.我有一个包含 4 项服务的应用程序。 One of them is Nginx which will act as a proxy.
其中之一是 Nginx,它将充当代理。 I use docker compose to run the services.
我使用 docker compose 来运行服务。 In nginx when I specify a path and where to proxy I want to be able to use the service name.
在 nginx 中,当我指定路径和代理位置时,我希望能够使用服务名称。 This is what I have done so far.
这是我到目前为止所做的。
version: '3'
services:
go_app:
image: go_app
depends_on:
- mysql
ports:
- "8000:8000"
mysql:
image: mysql_db
ports:
- "3306:3306"
flask_app:
image: flask_app
ports:
- "8080:8080"
nginx:
image: nginx_app
ports:
- "80:80"
depends_on:
- mysql
- flask_app
- go_app
With the above I create all services.通过以上内容,我创建了所有服务。 They all work on their respective ports.
他们都在各自的端口上工作。 I want Nginx to listen on port 80 and proxy as defined in the config:
我希望 Nginx 监听配置中定义的端口 80 和代理:
server {
listen 0.0.0.0:80;
server_name localhost;
location / {
proxy_pass http://${FLASK_APP}:8080/;
}
}
You may ask where does FLASK_APP come from.你可能会问 FLASK_APP 是从哪里来的。 I specify it inside nginx docker image:
我在 nginx docker 图像中指定它:
FROM nginx
ENV FLASK_APP=flask_app
RUN rm /etc/nginx/conf.d/default.conf
COPY config/default.conf /etc/nginx/conf.d/default.conf
EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]
Nginx container keeps failing with the following error: Nginx 容器不断失败,并出现以下错误:
[emerg] 1#1: unknown "flask_app" variable
nginx: [emerg] unknown "flask_app" variable
The way I understand docker compose, flask_app
should resolve as the flask_app service.我理解 docker 撰写的方式,
flask_app
应该解析为 flask_app 服务。 What am I doing wrong/misunderstanding?我在做什么错/误解?
The issue is that nginx does not read ENV variables.问题是 nginx 不读取 ENV 变量。
see https://github.com/docker-library/docs/tree/master/nginx#using-environment-variables-in-nginx-configuration见https://github.com/docker-library/docs/tree/master/nginx#using-environment-variables-in-nginx-configuration
a solution: you can modify you dockerfile for nginx
with this一个解决方案:你可以用这个修改你的 dockerfile 为
nginx
FROM nginx
ENV FLASK_APP=flask_app
RUN rm /etc/nginx/conf.d/default.conf
COPY default.conf /etc/nginx/conf.d/default.template
EXPOSE 80
CMD ["/bin/bash","-c","envsubst < /etc/nginx/conf.d/default.template > /etc/nginx/conf.d/default.conf && exec nginx -g 'daemon off;'"]
the COPY
command is modified to copy you configuration as a template. COPY
命令被修改为将您的配置复制为模板。
the last line is modified to do a substitution using your ENV variables.最后一行被修改为使用您的 ENV 变量进行替换。
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