Question

Am将两个容器uwsgi和nginx部署到AWS ECS存储库。我正在使用Fargate来部署和设置容器，但在容器之间的连接和通信中遇到错误。

error:No host not found in upstream "flask_app" in /etc/nginx/conf.d/nginx.conf.

Docker撰写yml文件。

version: "3"

services:
  db:
    container_name: db
    image: postgres
    restart: always
    environment:
      POSTGRES_DB: XXXXX
      POSTGRES_USER: XXXX
      POSTGRES_PASSWORD: XXXXX
    ports:
      - "54321:5432"

  flask_app:
    container_name: flask_app
    image: XXXXXXXXXXXXXXX.dkr.ecr.us-east-2.amazonaws.com/YYYYY:flask
    build:
      context: ./
      dockerfile: ./docker/Dockerfile-flask
    volumes:
      - .:/app
    depends_on:
      - db
    ports:
      - 5000:5000
    links:
      - db


  nginx:
    container_name: nginx
    image: XXXXXXXXXXXXXXX.dkr.ecr.us-east-2.amazonaws.com/YYYYY:backend
    env_file:
      - ./docker/users.variables.env
    build:
      context: .
      dockerfile: ./docker/Dockerfile-nginx
    ports:
      - 8080:80
    depends_on:
      - flask_app
    links:
      - flask_app

Nginx (nginx.conf):
server {
    listen 80;
    server_name localhost;    
    root /usr/share/nginx/html;
    location / {
        resolver 169.254.169.253;
        include uwsgi_params;
        proxy_pass http://flask_app:5000/;
        proxy_set_header Host "localhost";
    }
}


UWSGI.ini:
[uwsgi]
protocol = http
; This is the name of our Python file
; minus the file extension
module = start
; This is the name of the variable
; in our script that will be called
callable = app
master = true
; Set uWSGI to start up 5 workers
processes = 5
; We use the port 5000 which we will
; then expose on our Dockerfile
socket = 0.0.0.0:5000
vacuum = true
die-on-term = trueS

错误2019/08/23 12:27:13 [emerg] 1＃1：在/etc/nginx/conf.d/nginx.conf:8的上游“ flask_app”中找不到主机

Answer 1

在您的示例中，您依赖于Docker compose中设置的容器名称（flask_app）与其他容器进行通信。这对于在本地环境中进行Docker撰写非常有效，但对于使用Fargate的ECS而言则无效。

使用Fargate进行的部署使用awsvpc网络模式。如果它们属于同一任务，则允许这些容器通过localhost相互通信-请参阅AWS文档：https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-networking.html

如果您尝试配置Nginx反向代理Sidecar，则这些容器将属于同一任务。我意识到下面的示例使用uwsgi协议而不是http，但是它确实演示了通过localhost的通信（除非必须使用http，否则您可以轻松地修改配置以使用uwsgi）。这是使用uwsgi协议作为Fargate部署的nginx和uwsgi的有效配置：

nginx.conf：

server {
    listen 80;
    server_name localhost 127.0.0.1;
    root /usr/share/nginx/html;
    location / {
        include uwsgi_params;
        uwsgi_pass localhost:5000;
    }

和 uwsgi.ini 像这样：

[uwsgi]
module = wsgi:app
uid = www-data
gid = www-data
master = true

processes = 3

socket=localhost:5000
vacuum = true

die-on-term = true

（假设您使用示例中的端口5000）此配置将不能在您使用Docker compose和网桥网络的本地环境中工作-但是，如果您在Linux上，则可以使用主机网络对其进行仿真-可以找到有关设置本地测试环境的说明这里： https://aws.amazon.com/blogs/compute/a-guide-to-locally-testing-containers-with-amazon-ecs-local-endpoints-and-docker-compose/

希望这可以解决问题。

将容器部署到AWS存储库后，将UWSGI容器与NGINX容器[Docker]连接

1 个答案: