visualizer:
  image: dockersamples/visualizer:stable  
  ports:   
     - "8001:8080"  
  stop_grace_period: 1m30s 
  volumes:    - "/var/run/docker.sock:/var/run/docker.sock"  
  deploy:    
    update_config:     
      failure_action: rollback  
    placement:
      constraints:      
        - 'node.role == manager'