tmpfs

df -kh | grep tmpfs
tmpfs           3.2G  1.8M  3.2G   1% /run
tmpfs            16G     0   16G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs            16G     0   16G   0% /sys/fs/cgroup
tmpfs            16G  8.0K   16G   1% /tmp
tmpfs           3.2G     0  3.2G   0% /run/user/999
tmpfs           3.2G     0  3.2G   0% /run/user/1001

kubectl run -it ubuntu --image=ubuntu -- bash
root@ubuntu:/# df -kh
Filesystem      Size  Used Avail Use% Mounted on
overlay        59G   39G   17G  71% /
tmpfs            64M     0   64M   0% /dev
/dev/vda1        59G   39G   17G  71% /etc/hosts
shm              64M     0   64M   0% /dev/shm
tmpfs           7.7G   12K  7.7G   1% /run/secrets/kubernetes.io/serviceaccount
tmpfs           3.9G     0  3.9G   0% /sys/firmware

See also

• tmpfs