无法在Digitalocean Droplet上打开8080端口

Question

我的应用程序和Jenkins容器在我的Droplet上运行。我有两个这样的Docker容器：

8081端口已打开，我可以打开Jenkins，但是8080端口保持关闭状态（当我在www.yougetsignal.com上对其进行检查时，该端口已关闭）。我打不开有什么问题吗？

这是docker-compose.yml文件：

 version: '2'

services:

  web_app:
    build:
      context: .
      dockerfile: ./Docker/Dockerfile
    container_name: web_app
    restart: unless-stopped
    ports:
      - 8080:8080
    networks:
      - net

  jenkins:
    image: jenkinsci/blueocean
    container_name: jenkins
    volumes:
      - "/var/www/jenkins/jenkins_home:/var/jenkins_home"
      - "/var/run/docker.sock:/var/run/docker.sock"
      - "/var/www/jenkins:/home"
    ports:
      - "8081:8080"
    networks:
      - net

networks:
  net:

和应用程序Dockerfile：

 # Stage 1
FROM node:10.15-alpine as node
WORKDIR /usr/src/app
COPY package*.json ./
RUN npm install
COPY . .
RUN npm run build

# Stage 2
FROM nginx:1.13.12-alpine
COPY --from=node /usr/src/app/dist/oshop /usr/share/nginx/html
COPY Docker/nginx.conf /etc/nginx/conf.d/default.conf