version: '3'                                                                  
services:                                                                   
  wiki:                                                                     
    image: lacsap/dokuwiki                                  
    ports:                                                                
      - "8001:80"                                                          
    deploy:                                                               
      placement:                                                          
        constraints: [node.role == manager]                               
    volumes:                                                              
      - data:/data                                                        
volumes:                                                                      
  data: