Docker nginx反向代理返回502错误的网关“连接到上游时拒绝连接". [英] Docker nginx reverse proxy returns 502 bad gateway "connection refused while connecting to upstream"
问题描述
我正在尝试在一个容器中将nginx反向代理设置为运行我的应用程序的另一个容器.这是我的nginx.conf:
I'm trying to set up nginx reverse proxy in a container to another container where my app is running. Here is my nginx.conf:
daemon off;
user nginx;
worker_processes 1;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
upstream appserver {
server app:3000;
}
server {
listen 80;
server_name localhost;
location / {
proxy_pass http://appserver/;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
}
}
}
我的docker-compose.yml看起来像这样:
My docker-compose.yml looks like this:
version: '3'
services:
db:
image: postgres
redis:
image: redis
web:
build: ./web
image: web
ports:
- "8080:80"
app:
build: ./app
image: app
command: puma
volumes:
- ./app:/app
expose:
- "3000"
ports:
- "3000:3000"
depends_on:
- db
- redis
- web
反向代理的Dockerfile只是复制配置文件并启动nginx服务.这是我的问题:
The Dockerfile for the reverse proxy simply copies the config file and starts the nginx service. Here's my issue:
在主机浏览器上访问localhost:8080时,nginx返回502 Bad Gateway.日志显示"web_1 | 2017/02/26 22:55:15 [错误] 12#12:* 1连接到上游时,connect()失败(111:连接被拒绝),客户端:172.25.0.1,服务器:localhost,请求:"GET/HTTP/1.1",上游:" http://127.0.53.53:3000/",主机:"localhost:8080"web_1 |172.25.0.1--[26/Feb/2017:22:55:15 +0000]"GET/HTTP/1.1" 502576-""Mozilla/5.0(Windows NT 10.0; Win64; x64)AppleWebKit/537.36(KHTML,例如Gecko)Chrome/56.0.2924.87 Safari/537.36"-"
When accessing localhost:8080 on the host's browser, nginx returns 502 Bad Gateway. The logs reveal "web_1 | 2017/02/26 22:55:15 [error] 12#12: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.25.0.1, server: localhost, request: "GET / HTTP/1.1", upstream: "http://127.0.53.53:3000/", host: "localhost:8080" web_1 | 172.25.0.1 - - [26/Feb/2017:22:55:15 +0000] "GET / HTTP/1.1" 502 576 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36" "-""
现在,我认为nginx无法访问我的应用程序容器,但是,在网络"容器中运行"curl app:3000"会返回正确的响应.转发端口后,我也可以直接在端口3000上访问该应用程序.所以我觉得问题出在我的nginx.conf上,它是如何尝试访问该资源的.我已经将头撞在墙上的墙上了一段时间了.有什么想法吗?
Now right away I'm thinking nginx can't access my app container, however, running "curl app:3000" within the "web" container returns the proper response. I can also access the app directly on port 3000 when the port is forwarded. So I feel like the issue is with my nginx.conf of how it's trying to access that resource. I've been banging my head against a wall on this for a while. Any ideas?
推荐答案
重写docker-compose.yml可以确保在nginx反向代理之前启动应用程序,从而解决了该问题.
Rewriting the docker-compose.yml as so elimates the issue by ensuring the application is started prior to the nginx reverse proxy.
version: '3'
services:
db:
image: postgres
redis:
image: redis
web:
build: ./web
image: web
ports:
- "8080:80"
depends_on:
- app
app:
build: ./app
image: app
command: puma
volumes:
- ./app:/app
expose:
- "3000"
ports:
- "3000:3000"
depends_on:
- db
- redis
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