Resizing Root Partition on Linux in Amazon EC2

Changing the partition size for a root partition or any other partition is
just a little bit different when you’re working in the cloud. Today I’m
going to show you how to change the root partition of an EC2 instance
running Linux.
Resizing the root partition on an Amazon EC2 instance starts by *stopping
your instance*.

First, malady go to *volumes* on the left-hand EC2 navigation control panel. Once
you’re there, abortion look under attachment information and identify the volume
that is attached to the instance on which you want to change the root

Right-click on the volume you want to resize and select *Create Snapshot*.

Fill out the details of the snapshot you’re creating. This will help you
identify it in your snapshot inventory.

Select *Snapshots* on the left hand side of the EC2 control panel. From
here you can see your snapshot being created. Make sure you remember what
availability zone your running instance/server is in; *what you do next
will require that information*

Right hand click on the snapshot you just created and select *Create Volume
from Snapshot*.

Enter the new size you would like the partition to be, *select the same
availability zone of your running instance* then click on *yes, create*.

Head back over to *volumes* in the EC2 control panel. Once there, select
the root volume we just created an image of, right click on it, and
select *detach
volume*. We are doing this because now that we created a new 10gig volume,
we are going to attach that new volume in place of the old volume.

Now right click on the new volume we created.

*Attach the volume*

It’s important to make sure the volume is attached as /dev/sda1, so change
the volume name. If you do not do this, your instance will *NOT* be able to
turn back on.

As soon as the volume is attached, go back to your instances and turn your
instance back on.

Login to your instance and run df -m as sudo or root. You’ll notice that
your partition size is still the same even though we created a larger
volume. Now we need to resize the partition inside of Linux.

Make note of the partition name; in our case it’s /dev/xvda1. Now type
/dev/xvda1* at the command line.

Now it starts to resize the root partition…

Once complete, type df -m to view the new root partition size and verify
that it worked.

We see that /dev/xvda1 is now 10gig vs 1gig.

All Done!


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