Resize RHEL server OS disk in Azure:
Pre-Requisite:
1.Create an image of your VM disk.
| Images –> Add –> Give Name, Storage blob URL, ResourceGroup, OS Type –> Create |
2.Stop the VM
| VM –> Overview –> Stop |
For Ubuntu:
| VM –> Disks –> click on OS Disk –>> Change the Size –>> Save |
For Ubuntu this will take effect directly.
For RHEL follow the below steps.
Steps to increase the volume:
start your instance and run the following command as root user or root privileged user.
1) fdisk /dev/sda => Replace sda with your partition to change the size
2) Command (m for help): => Prompt will be like this
3) Type ‘p’ => Will show partitions like /dev/sda1 , /dev/sda2 etc…
4) Type ‘d’ then partition number to delete => If you are going to resize sda2 give ‘2’
5) Type ‘n’ then ‘p’, 2 (to recreate partition 2) you can accept the default values
6) Type ‘w’ => It will update partition table with new sector range
7) Type ‘q’ => To exit fdisk
8) sudo reboot => Reboot the VM to update the partition
9) sudo xfs_growfs /dev/sda2 => At last execute the below command to update the partition in file system
Note: For RHEL 6 version use, sudo resize2fs /dev/sda2
Using Azure-cli can resize the root disk of managed disk:
1) Login to azure cli
az login
2) Stop the VM
az vm deallocate –resource-group <ResourceGroup> –name <VMName>
3) Get the list of disks in the resource group of VM
az vm list –resource-group <ResourceGroup> –query “[*].{Name:name,DiskName:storageProfile.osDisk.name}” –output table
4) Update the disk size
az disk update –resource-group <ResourceGroup> –name <DiskName> –size-gb <NewSize>
5) Now check the updated disk size
az disk list –resource-group <ResourceGroup> –query “[?name == ‘<DiskName>’].{Name:name, DiskSize:diskSizeGb}” –output table
6) Start the VM
az vm start –resource-group <ResourceGroup> –name <VMName>
7) After resize have to follow the above common steps to reflect the updated size.
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