Storage

Check disk drives:

sudo fdisk -l

Example:

Device     Boot    Start      End  Sectors Size Id Type
/dev/vda1  *        2048 44037759 44035712  21G 83 Linux
/dev/vda2       44037760 52426367  8388608   4G 82 Linux swap / Solaris

Check Partitions

-h is used to show sizes in Megabytes, Gigabytes etc.

sudo df -h

Should look like this:

Filesystem      Size  Used Avail Use% Mounted on
udev            967M     0  967M   0% /dev
tmpfs           199M  564K  199M   1% /run
/dev/vda1       4.4G  1.9G  2.4G  44% /
tmpfs           994M     0  994M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           994M     0  994M   0% /sys/fs/cgroup
tmpfs           199M     0  199M   0% /run/user/0

When /dev/(sda1/vda1 etc) are not the same size

this (21G):

Device     Boot    Start      End  Sectors Size Id Type
/dev/vda1  *        2048 44037759 44035712  21G 83 Linux

and this are not matching (2.4G):

Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1       4.4G  1.9G  2.4G  44% /

run this:

sudo resize2fs /dev/vda1

check Paritions again:

sudo df -h

Should now look like this:

Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        21G  1.9G   18G  10% /