When creating Virtual Machines in Azure, you will observe that the root partition has a Default of 32GB for linux. This uses the XFS
file system. Orchestration tools like terraform have options of defining this size but it’s up to you; the Administrator to resize
accordingly
Base Default
When a new linux vm is created, this is what the file system looks like. This is for type RAW
Filesystem Size Used Avail Use% Mounted on
devtmpfs 958M 0 958M 0% /dev
tmpfs 968M 0 968M 0% /dev/shm
tmpfs 968M 9.0M 959M 1% /run
tmpfs 968M 0 968M 0% /sys/fs/cgroup
/dev/sda2 32G 1.6G 30G 6% /
/dev/sda1 497M 101M 397M 21% /boot
/dev/sdb1 3.9G 2.1G 1.7G 56% /mnt/resource
tmpfs 194M 0 194M 0% /run/user/1000
Our goal is to resize /dev/sda2 32G 1.6G 30G 6% / for 32Gb to 200Gb
Stop the Virtual Machine
To stop the VM privrhelserver-0 with Resource Group DEVLABS-NETWORK-RG, type command below. Substitute in your case and ensure you have the subscription defaults set
az vm stop --name privrhelserver-0 --resource-group DEVLABS-NETWORK-RG
Verify the VM has stopped
az vm list -o table -d | grep privrhelserver-0
You should see this
privrhelserver-0 DEVLABS-NETWORK-RG VM stopped eastus
Deallocate VM Resource
az vm deallocate --resource-group DEVLABS-NETWORK-RG --name privrhelserver-0
Update Disk Size
List Disk
List existing disks. NOTE: You will find a list depending on the number of VMs you have
az disk list --resource-group DEVLABS-NETWORK-RG --query '[*].{Name:name,Gb:diskSizeGb,Tier:accountType}' --output table
Name Gb
------------------------------------------------------- ----
privrhelserver-0-dsk 35
Update Disk Size
az disk update --resource-group DEVLABS-NETWORK-RG --name privrhelserver-0-dsk --size-gb 200
Start VM
az vm start --name privrhelserver-0 --resource-group DEVLABS-NETWORK-RG
Resize Disk Size
SSh into the VM and check the disk size. df -h.
Filesystem Size Used Avail Use% Mounted on
devtmpfs 958M 0 958M 0% /dev
tmpfs 968M 0 968M 0% /dev/shm
tmpfs 968M 9.0M 959M 1% /run
tmpfs 968M 0 968M 0% /sys/fs/cgroup
/dev/sda2 32G 1.6G 30G 6% /
/dev/sda1 497M 101M 397M 21% /boot
/dev/sdb1 3.9G 2.1G 1.7G 56% /mnt/resource
tmpfs 194M 0 194M 0% /run/user/1000
or sudo lsblk. You Should see
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
fd0 2:0 1 4K 0 disk
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 31.5G 0 part /
sdb 8:16 0 4G 0 disk
└─sdb1 8:17 0 4G 0 part /mnt/resource
The focus will be on sda.
Run fdisk on that partition
You should have this
The device presents a logical sector size that is smaller than
the physical sector size. Aligning to a physical sector (or optimal
I/O) size boundary is recommended, or performance may be impacted.
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Type p and you should see
Command (m for help): p
Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: dos
Disk identifier: 0x0009d9ef
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 67108863 33041408 83 Linux
Type d then 2 and you should see
Command (m for help): d
Partition number (1,2, default 2): 2
Partition 2 is deleted
Type n then p and defaults
Command (m for help): n
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p): p
Partition number (2-4, default 2): 2
First sector (1026048-419430399, default 1026048):
Using default value 1026048
Last sector, +sectors or +size{K,M,G} (1026048-419430399, default 419430399):
Using default value 419430399
Partition 2 of type Linux and of size 199.5 GiB is set
Type w and then reboot
Resize the VMS
Log into the VM and resize
You should see
meta-data=/dev/sda2 isize=512 agcount=4, agsize=2065088 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=8260352, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=4033, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 8260352 to 52300544
Verify New Size
Run df -h and you should see
Filesystem Size Used Avail Use% Mounted on
devtmpfs 958M 0 958M 0% /dev
tmpfs 968M 0 968M 0% /dev/shm
tmpfs 968M 9.0M 959M 1% /run
tmpfs 968M 0 968M 0% /sys/fs/cgroup
/dev/sda2 200G 1.6G 198G 1% /
/dev/sda1 497M 101M 397M 21% /boot
/dev/sdb1 3.9G 2.1G 1.7G 56% /mnt/resource
tmpfs 194M 0 194M 0% /run/user/1000
or lsblk and you should see
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
fd0 2:0 1 4K 0 disk
sda 8:0 0 200G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 199.5G 0 part /
sdb 8:16 0 4G 0 disk
└─sdb1 8:17 0 4G 0 part /mnt/resource