Where are docker-compose with volume names stored?

I have this docker-compose.yml

file

version: '3'

volumes:
  jenkins_home:

services:

  registry:
     image: registry:2
     ports:
       - "5000:5000"

  jenkins:
    image: jenkins/jenkins
    ports:
      - "9090:8080"
    volumes:
      - jenkins_home:/var/jenkins_home

      

        
        
        
      

    

As you can see there is a named volume called jenkins_home

, now I am wondering where the data is actually stored?

running docker inspect infra_jenkins

I got this:

 ...
 "Mounts": [
    {
      "Type": "volume",
      "Source": "infra_jenkins_home",
      "Target": "/var/jenkins_home",
      "VolumeOptions": {
      "Labels": {
      "com.docker.stack.namespace": "infra"
              }
          }
      }
],
...

      

        
        
        
      

    

I am starting these services on a local swock clusters with a command docker stack deploy

, the cluster is made up of 3 VirtualBox instances.