How to extend file system after resize disk volume

Hello, could you help us please with this issue; we would like to extend file system after resize disk volume on VMware; so we would like to increased the size of the volume in Debian Suite CRM Bitnami Image using CLI The original disk size is on 15 GB so we would like to increase to 50GB
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 14.9G 0 disk
└─sda1 8:1 0 14.9G 0 part /
root@debian:/home/bitnami#
root@debian:/home/bitnami#
root@debian:/home/bitnami# df -h
Filesystem Size Used Avail Use% Mounted on
udev 992M 0 992M 0% /dev
tmpfs 201M 5.6M 195M 3% /run
/dev/sda1 15G 3.0G 11G 22% /
tmpfs 1003M 8.0K 1003M 1% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 1003M 0 1003M 0% /sys/fs/cgroup
root@debian:/home/bitnami#

Hi,
please consider that this question is not really related to SuiteCRM - other communities might be more helpful.
Still, here you have a promising tutorial:

https://communities.vmware.com/thread/449261

(you will possibly find a more recent tutorial there -> but please create a backup first. These kind of operations might crash your diskimage).