.. _increase-virtual-disk-size:

Increase virtual disk size of a Clear Linux\* image 
###################################################

|CLOSIA| prebuilt images come in different sizes, ranging from 300 MB to 20
GB. This guide describes how to increase the size of your prebuilt |CL| image
if you need more capacity.

.. contents:: This guide will cover:

Determine the partition order and sizes of the prebuilt image 
*************************************************************

There are two methods to find the order and sizes of partitions virtual disk 
of your prebuilt |CL| image.

In both examples, the prebuilt Hyper-V image has a disk size of 8.5 GB with /
dev/sda3 being the partition for the root filesystem (/)

Checking :command:`lsblk` on the VM
-----------------------------------

The first method is to boot up your :abbr:`VM (Virtual Machine)` and
execute the :command:`lsblk` command as shown below:

.. code-block:: bash

   sudo lsblk

An example output of the :command:`lsblk` command: 

.. code-block:: console

   NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
   sda      8:0   0    8.5G  0 disk
   ├─sda1   8:1   0    512M  0 part
   ├─sda2   8:2   0     32M  0 part [SWAP]
   └─sda3   8:3   0      8G  0 part /         

An example of this can also be seen in Figure 1.

Checking :file:`config.json` used to build the image  
----------------------------------------------------

The second method to determine partition to check the :file:`config.json` 
file used to create prebuilt image, located in the `releases`_ repository.
For example, to find the size of the Hyper-V\* image version number 20450, 
follow these steps:

#. Go to the `releases`_ repository.
#. Drill down into the `20450 > clear > config > image` directory.
#. Open the :file:`hyperv-config.json` file.
#. Locate the `PartitionLayout` key.

   The example shows 512 MB for the EFI partition, 32 MB for the swap
   partition, and 8 GB for the root partition.


   .. code-block:: console

      "PartitionLayout" : [ { "disk" : "hyperv.img",
                              "partition" : 1,
                              "size" : "512M",
                              "type" : "EFI" },
                              { "disk" : "hyperv.img",
                              "partition" : 2,
                              "size" : "32M",
                              "type" : "swap" },
                              { "disk" : "hyperv.img",
                              "partition" : 3,
                              "size" : "8G",
                              "type" : "linux" } ],

Increase virtual disk size
**************************
Once you have determined the disk and partition to be increased, you are 
ready to perform the actual increase of the disk, partition, and filesystem.

Power off VM and increase virtual disk size:
--------------------------------------------

To increase the virtual disk size for a prebuilt image, perform the steps 
below:

#. Shut down your VM if it is running.
#. Use the process defined by your hypervisor 
   or cloud provider to increase
   the virtual disk size of your |CL| VM.
#. Power up the VM.


Resize the partition of the virtual disk:
-----------------------------------------

#. Log in to an account with root privileges.
#. Open a terminal emulator.
#. Add the |CL| `storage-utils` bundle to install the 
   :command:`parted` and :command:`resize2fs` tools.

   .. code-block:: bash

      sudo swupd bundle-add storage-utils

#. Launch the `parted` tool.

   .. code-block:: bash

      sudo parted

#. In the `parted` tool, perform these steps:

   #. Press :command:`p` to print the partitions table.
   #. If the warning message below is displayed, enter :command:`Fix`.

      .. code-block:: console

         Warning: Not all of the space available to /dev/sda appears to be
         used, you can fix the GPT to use all of the space (an extra ...
         blocks) or continue with the current setting?

         Fix/Ignore?

   #. Enter :command:`resizepart [partition number]` where 
      *[partition number]* is the partition number of the partition to modify.
   #. Enter :command:`yes` when prompted.
   #. Enter the new `End` size.

      .. note::

         If you want a partition to take up the remaining disk space, then
         enter the total size of the disk. When you print the partitions
         table with the :command:`p` command, the total disk size is shown
         after the `Disk` label.

         An example of this can be seen in Figure 1.

   #. Enter :command:`q` to exit `parted` when you are finished resizing the
      image.

      Figure 1 depicts the described steps  to resize the partition of the virtual disk from 8.5GB to 20GB.

      .. figure:: figures/increase-virtual-disk-size-1.png
         :scale: 100 %
         :alt: Increase root partition size 

         Figure 1: Increase root partition size.

Resize the filesytem 
--------------------

#. Enter :command:`sudo resize2fs -p /dev/[modified partition name]` where
   *[modified partition name]* is the partition that was changed in `parted`.

#. Run the :command:`df -h` to verify that the filesystem size has
   increased. 

   Figure 2 depicts the described steps to resize the partition of the virtual disk from 8.5GB to 20GB.

   .. figure:: figures/increase-virtual-disk-size-2.png
      :scale: 100 %
      :alt: Increase root filesystem with resize2fs

      Figure 2: Increase root filesystem size after partition has been expanded.

Congratulations! You have resized the disk, partition, and filesystem. At
this point, the increase in disk capacity is usable. 

.. _releases: https://download.clearlinux.org/releases/