root@localhost:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            983M     0  983M   0% /dev
tmpfs           200M  548K  199M   1% /run
/dev/vda1        40G   13G   26G  33% /
tmpfs           998M     0  998M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           998M     0  998M   0% /sys/fs/cgroup
tmpfs           200M     0  200M   0% /run/user/0
overlay          40G   13G   26G  33% /var/lib/docker/overlay2/238d960d08a12732de1d4ad32b51abdba9c726c8a02c0b24daa2be4fe153c709/merged