码头工人群:没有合适的节点(每个节点的最大副本超过)为什么？

Question

我有这个dockr复合的。

version: '3.8'
services:
  mongo:
    image: mongo
    restart: always
    env_file:
      - ./.env
    environment:
      MONGO_INITDB_ROOT_USERNAME: ${MONGO_USERNAME}
      MONGO_INITDB_ROOT_PASSWORD: ${MONGO_PASSWORD}
    volumes:
      - mongo-db:/data/db
    ports:
      - "27017:27017"

  node-app:
    depends_on:
      - mongo
    image: USERNAME/PRIVATE_REPO_NAME:0.1
    env_file:
      - ./.env
    deploy:
      replicas: 2
      placement:
        max_replicas_per_node: 1
      update_config:
        parallelism: 1
        delay: 10s
      resources:
        limits:
          cpus: '0.50'
          memory: 512M
        reservations:
          cpus: '0.25'
          memory: 256M

  nginx:
    depends_on:
      - node-app
    image: nginx:stable-alpine
    ports:
      - "80:80"
    volumes:
      - ./nginx/default.conf:/etc/nginx/conf.d/default.conf

  mysql:
    image: mysql
    command: --default-authentication-plugin=mysql_native_password
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_USER: admin
      MYSQL_PASSWORD: password
      MYSQL_ALLOW_EMPTY_PASSWORD: 1
      MYSQL_DATABASE: db
    ports: 
      - 3306:3306
      - 33060:33060
    volumes:
      - mysql-db:/var/lib/mysql

  adminer:
    image: adminer
    restart: always
    ports:
      - 8080:8080
    depends_on: 
      - mysql

  portainer:
    image: portainer/portainer-ce:latest
    restart: unless-stopped
    security_opt:
      - no-new-privileges:true
    volumes:
      - /etc/localtime:/etc/localtime:ro
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - ./portainer-data:/data
    ports:
      - 9000:9000

  volumes:
    mongo-db:
    mysql-db:

和码头-合成-生产。

version: '3.8'
services:
  node-app:
    build:
      context: .
      target: production
    environment:
      - NODE_ENV=production
    command: npm start

Dockerfile

FROM node:14 as base

FROM base as production
WORKDIR /app
COPY package.json .
RUN npm install --only=production
COPY . .
EXPOSE 4000

FROM base as development
....

Nginx default.conf

server { # simple reverse-proxy
  listen       80;

  # pass requests for dynamic content to rails/turbogears/zope, et al
  location / {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_set_header X-NginX-Proxy true;
    proxy_pass http://node-app:4000;
    proxy_redirect off;
  }
}

我构建映像并将其推送到专用码头回购，然后在VPS (1 vCPU和1 GM )上拉出映像，然后运行

docker stack deploy -c docker-compose.yml -c docker-compose-prod.yml nodestack --with-registry-auth

但是我运行docker stack ps nodestack我得到

is7hybeurfgb   nodestack_adminer.1     adminer:latest                  docker-desktop   Running         Running about a minute ago
l92hsxrnpznh   nodestack_mongo.1       mongo:latest                    docker-desktop   Running         Preparing about a minute ago
2sg4x4lzk5uy   nodestack_mysql.1       mysql:latest                    docker-desktop   Running         Running 2 minutes ago
88vnttgk5grb   nodestack_nginx.1       nginx:stable-alpine             docker-desktop   Running         Running 2 minutes ago
7l5bm8tnjatv   nodestack_node-app.1    USERNAME/PRIVATE_REPO_NAME:0.1   docker-desktop   Running         Running 2 minutes ago
4xn3odusd265   nodestack_node-app.2    USERNAME/PRIVATE_REPO_NAME:0.1                    Running         Pending 2 minutes ago          "no suitable node (max replica…"
o38en2hwnikp   nodestack_portainer.1   portainer/portainer-ce:latest   docker-desktop   Running         Running about a minute ago

而且它不会用新的更新来重新创建节点。为什么我要获得no suitable node (max replicas per node limit exceed)，以及如何修复它以保持每个副本中只有一个节点运行两个副本？

Answer 1

我认为您混淆了群集集群中的节点和容器中的NodeJS实例。他们之间没有任何关系。从这一产出：

7l5bm8tnjatv   nodestack_node-app.1    USERNAME/PRIVATE_REPO_NAME:0.1   docker-desktop   Running         Running 2 minutes ago
4xn3odusd265   nodestack_node-app.2    USERNAME/PRIVATE_REPO_NAME:0.1                    Running         Pending 2 minutes ago          "no suitable node (max replica…"

看起来，您在docker-desktop上运行，其中包含一个节点群集群。你可以在docker node ls上看到这一点。若要在桌面上部署多个容器，请删除约束：

        max_replicas_per_node: 1

或设置多个群集节点(VM)并部署到该集群。