$ juju run --service swift-storage 'sudo df -h'
- MachineId: "1"
  Stdout: |
    Filesystem      Size  Used Avail Use% Mounted on
    udev            3.9G   12K  3.9G   1% /dev
    tmpfs           799M  676K  798M   1% /run
    /dev/sda1        30G   21G  7.3G  74% /
    none            4.0K     0  4.0K   0% /sys/fs/cgroup
    none            5.0M     0  5.0M   0% /run/lock
    none            3.9G  4.0K  3.9G   1% /run/shm
    none            100M     0  100M   0% /run/user
    /dev/sdc         30G  571M   30G   2% /srv/node/sdc
    /dev/sdb         16G   33M   16G   1% /srv/node/sdb
    /dev/sdd         16G   33M   16G   1% /srv/node/sdd
  UnitId: swift-storage/0
- MachineId: "3"
  Stdout: |
    Filesystem      Size  Used Avail Use% Mounted on
    udev            3.9G   12K  3.9G   1% /dev
    tmpfs           799M  692K  798M   1% /run
    /dev/sda1        30G   20G  8.8G  69% /
    none            4.0K     0  4.0K   0% /sys/fs/cgroup
    none            5.0M     0  5.0M   0% /run/lock
    none            3.9G  4.0K  3.9G   1% /run/shm
    none            100M     0  100M   0% /run/user
    /dev/sdd         30G  571M   30G   2% /srv/node/sdd
    /dev/sdc         16G   33M   16G   1% /srv/node/sdc
    /dev/sdb         16G   33M   16G   1% /srv/node/sdb
  UnitId: swift-storage/1
- MachineId: "4"
  Stdout: |
    Filesystem      Size  Used Avail Use% Mounted on
    udev            3.9G   12K  3.9G   1% /dev
    tmpfs           799M  676K  798M   1% /run
    /dev/sda1        30G   21G  6.9G  76% /
    none            4.0K     0  4.0K   0% /sys/fs/cgroup
    none            5.0M     0  5.0M   0% /run/lock
    none            3.9G  4.0K  3.9G   1% /run/shm
    none            100M     0  100M   0% /run/user
    /dev/sdd         16G  571M   16G   4% /srv/node/sdd
    /dev/sdc         30G   33M   30G   1% /srv/node/sdc
    /dev/sdb         16G   33M   16G   1% /srv/node/sdb
  UnitId: swift-storage/2