live-resize-root-partition-on-linux-server

Step 1

Check your current partition size and drive by using df -h and fdisk -l /dev/sda command (assuming your drive is sda):

As you can see, the root partition / and the drive total capacity are around 20GB.

Step 2

Now you need to rescan your block device sda with the following command:

$ echo 1 > /sys/block/sda/device/rescan

And check again drive capacity by using fdisk -l /dev/sda command:

Now your drive has 40GB capacity, but your root partition still uses only 20GB. To resize the root partition, you need to run fdisk /dev/sda:

$ fdisk /dev/sda

Now press “p” to print the current partition layout.

This operation can be dangerous, so please follow the following steps with caution!

Step 3

Now delete your primary partition /dev/sda1 by pressing the d key.

Step 4

Create a new partition by pressing the n key and pressing 1 for the partition number.

Step 5

Use the default value of Fist sector and Last sector

Step 6

Do not remove the existing signature! Press n to avoid removal.

Step 7

: Now press the w key to save the partition table.

Step 8

Type resize2fs / command and check your current root patition capacity by using df -h:

$ resize2fs /dev/sdaxx
$ df -h