Extending the Guest VM hard disk

The default disk size of the created instance is 175.8G. Follow these instructions to extend the guest VM.

1. Shut down a running guest machine's virtual disk by entering its name or ID.

   [localadmin@localhost network-scripts]$ sudo virsh list
   [sudo] password for localadmin:
    Id    Name                           State
   ----------------------------------------------------
    1     EngPerf3-CL1-TN                running
    2     EngPerf3-NCN-TN                running
    9     vt800_128                      running
   
   [localadmin@localhost network-scripts]$
   

   [localadmin@localhost network-scripts]$ sudo virsh shutdown <instance-name>
   Domain vt800_128 is being shutdown
   
   [localadmin@localhost network-scripts]$
   

   [localadmin@localhost network-scripts]$ sudo virsh list
    Id    Name                           State
   ----------------------------------------------------
    2     EngPerf3-CL1-TN                running
    3     EngPerf3-NCN-TN                running
   
   [localadmin@localhost network-scripts]$
   

2. Locate the guest image disk path.

   [localadmin@localhost ~]$ sudo virsh domblklist vt800_128
   Target     Source
   ------------------------------------------------
   hda        /home/localadmin/Downloads/vt800_128v1_OS_7_0_0_0_0_GA_09132019_kvm_R8_2_0_1_0_GA_10172019.qcow2
   
   [localadmin@localhost ~]$
   

3. Extend the disk size to the desired capacity by entering the following command.

   [localadmin@localhost ~]$ sudo qemu-img resize /home/localadmin/Downloads/vt800_128v1_OS_7_0_0_0_0_GA_09132019_kvm_R8_2_0_1_0_GA_10172019.qcow2 +10G
   
   

   Note:

   quemu-img cannot resize an image that contains snapshots. You must first remove all VM snapshots:

   [localadmin@localhost ~]$ sudo virsh snapshot-list vt800_128
   Name        Creation Time               State
   --------------------------------------------------
    snapshot1   2019-04-16 08:54:24 +0300   shutoff
   

   [localadmin@localhost ~]$ sudo virsh snapshot-delete --domain vt800_128 --snapshotname snapshot1
   Domain snapshot snapshot1 deleted
   

4. Extend the disk by using + before disk capacity

   [localadmin@localhost ~]$ sudo qemu-img resize /home/localadmin/Downloads/vt800_128v1_OS_7_0_0_0_0_GA_09132019_kvm_R8_2_0_1_0_GA_10172019.qcow2 +10G
   Image resized.
   [localadmin@localhost ~]$
   

5. Power up the guest machine

   [localadmin@localhost ~]$ sudo virsh start vt800_128
   Domain vt800_128 started
   
   [localadmin@localhost ~]$
   

6. Verify the disk layout

   talariuser@DUT-KVM-VT800:~# sudo lsblk
   NAME   MAJ:MIN	   RM	   SIZE	   RO 	  TYPE 	 MOUNTPOINT
   sda      8:0   		 0 	185.8G    0 	    disk
   ├─sda4   8:4   		 0     	1K  	 0 	    part
   ├─sda2   8:2    		0    	10G  	 0 	    part    /
   ├─sda5   8:5    		0     	1G  	 0 	    part 	  [SWAP]
   ├─sda3   8:3   		 0    	10G  	 0 	    part
   ├─sda1   8:1    		0   	200M  	 0 	    part 	  /grub
   └─sda6   8:6    		0 	154.6G    0 	    part 	  /home
   talariuser@DUT-KVM-VT800:~#