Docker Stack部署后Backend/Frontend服务未分配节点故障排查

问题现象 #

使用双节点Docker Swarm环境，通过docker stack deploy部署栈服务，某次更新后出现以下异常：

• 执行docker stack ps project-name，发现backend和frontend服务未分配任何节点
• 执行docker service ls，显示这两个服务的副本数为0/1

已尝试的操作 #

• 手动执行docker service update --replicas=1 project-name_{backend/frontend}更新服务副本数，无效
• 怀疑本地构建的镜像未推送至镜像仓库导致节点拉取失败，已将backend和frontend镜像推送到私有镜像仓库private.registry.com，且管理节点、工作节点均执行docker login完成仓库登录
• 尝试添加--force参数强制更新服务，命令执行后陷入停滞状态，输出如下：

ubuntu:~/app$ docker service update --force --replicas=1 project-name_backend 
project-name_backend
overall progress: 0 out of 1 tasks 
1/1: new       [=====>                                             ] 

• 已搜索Stack Overflow及相关网络资源，现有陈旧问答无法解决问题

Docker Compose配置（部分名称已混淆） #

name: spc-app
services:
  backend:
    deploy:
      replicas: 1
      labels:
        traefik.constraint-label: traefik-public
        traefik.docker.network: traefik-public
        traefik.enable: "true"
        traefik.http.routers.spc-backend-http.rule: Host(`backend.spc.com`)
        traefik.http.routers.spc-backend-http.tls: "true"
        traefik.http.routers.spc-backend-http.tls.certresolver: le
        traefik.http.services.spc-backend-http.loadbalancer.server.port: "8000"
    image: private.registry.com/spc/project/backend-prod:latest

  frontend:
    build:
      context: /home/ubuntu/spc-app/frontend
      dockerfile: ./docker/prod/Dockerfile
      args:
        REACT_APP_BACKEND_HTTP: https://backend.spc.com
        REACT_APP_BACKEND_WS: wss://backend.spc.com/ws
    depends_on:
      backend:
        condition: service_started
    deploy:
      replicas: 1
      labels:
        traefik.constraint-label: traefik-public
        traefik.docker.network: traefik-public
        traefik.enable: "true"
        traefik.http.routers.spc-frontend-http.rule: Host(`www.spc.com`)
        traefik.http.routers.spc-frontend-http.tls: "true"
        traefik.http.routers.spc-frontend-http.tls.certresolver: le
        traefik.http.services.spc-frontend-http.loadbalancer.server.port: "80"
    image: private.registry.com/spc/project/frontend-prod:latest
    networks:
      default: null
      traefik-public: null

networks:
  default:
    name: spc-app_default
  postgres:
    name: postgres
    external: true
  traefik-public:
    name: traefik-public
    external: true
volumes:
  mediafiles:
    name: spc-app_mediafiles
  staticfiles:
    name: spc-app_staticfiles

内容的提问来源于stack exchange，提问作者Sifnos