gistfile1.txt

                                                                                  
storage:                                                                          
  filesystems:                                                                    
    - mount:                                                                      
        device: /dev/xvdb                                                         
        format: ext4                                                              
        create:                                                                   
            force: false                                                          
                                                                                  
systemd:                                                                          
  units:                                                                          
    - name: media-ephemeral.mount                                                 
      enable: true                                                                
      contents: |                                                                 
        [Mount]                                                                   
        What=/dev/xvdb                                                            
        Where=/media/ephemeral                                                    
        Type=ext4                                                                 
                                                                                  
        [Install]                                                                 
        RequiredBy=local-fs.target