docker issue

root@4f759f855980:/# df -h
Filesystem      Size  Used Avail Use% Mounted on
none            193G  6.3G  177G   4% /
tmpfs          1002M     0 1002M   0% /dev
tmpfs          1002M     0 1002M   0% /sys/fs/cgroup
Users           406G  351G   56G  87% /var/www/html
/dev/sda1       193G  6.3G  177G   4% /etc/hosts
shm              64M     0   64M   0% /dev/shm
root@4f759f855980:/# fstab
bash: fstab: command not found
root@4f759f855980:/# cat /etc/fstab
# UNCONFIGURED FSTAB FOR BASE SYSTEM