Google Cloud Resize Boot and Non-Boot Disks

Step-01: Introduction¶

Resize Boot Disk
Resize Non-Boot Disk
Best Practice: Take snapshots of both disks before doing this Resize step in real-world. In our case, snapshot also holds storage space we will ignore.

Step-02: Resize Disks for demo7-vm¶

Currently demo7-vm containes Boot Disk and Non-Boot Disk
Boot Disk Name: demo7-vm
Non-Boot Disk Name: mydisk1
Boot disk:
VMs using public images automatically resize the root partition and file system after you've resized the boot disk on the VM and restarted the VM.
If you are using an image that does not support this functionality, you must manually resize the root partition and file system.
Non-boot disk:
After resizing the disk, you must extend the file system on the disk to use the added space.

Stop demo7-vm if not stopped¶

# Stop VM Instance
gcloud compute instances stop demo7-vm --zone=us-central1-a
gcloud compute instances list --filter='name:demo7-vm'

Step-03: Resize Boot Disk demo1-vm¶

Go to Compute Engine -> Storage -> Disks -> demo7-vm -> Edit
Size: 10GB (Current Size)
Size: 20GB (New Size)
Click on SAVE

Step-04: Resize Non-Boot Disk disk1-nonboot-app1¶

Go to Compute Engine -> Storage -> Disks -> disk1-nonboot-app1 -> Edit
Size: 15GB (Current Size)
Size: 25GB (New Size)
Click on SAVE

Step-05: Start VM demo7-VM and Connect to VM using SSH and Verify Root Mount Size¶

Go to Compute Engine -> VM Instances -> demo7-vm -> Actions -> Start

# Start VM Instance
gcloud compute instances start demo7-vm --zone=us-central1-a
gcloud compute instances list --filter='name:demo7-vm'

# Connect to VM instance using cloud shell 
gcloud compute ssh --zone "us-central1-a" "demo7-vm" --project "gcplearn9"

# Verify Root Mount Size 
sudo df -Th

dkalyanreddy@demo7-vm:~$ df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
udev           devtmpfs  478M     0  478M   0% /dev
tmpfs          tmpfs      98M  392K   98M   1% /run
/dev/sda1      ext4       20G  2.0G   17G  11% /  ----- ROOT MOUNT SIZE CHANGED to 40GB
tmpfs          tmpfs     488M     0  488M   0% /dev/shm
tmpfs          tmpfs     5.0M     0  5.0M   0% /run/lock
/dev/sda15     vfat      124M   11M  114M   9% /boot/efi
/dev/sdb       ext4       15G   28K   15G   1% /mnt/disks/myapp1 -- NONBOOT-DISK NOT CHANGED
tmpfs          tmpfs      98M     0   98M   0% /run/user/1000
dkalyanreddy@demo7-vm:~$

In the above case, debian supported automatic root partition and file system resize, so automatically ROOT Partition size increased to from 10GB to 20GB
If the Operating system you are using doesn't support this, you can follow steps in google documentation

Step-06: Resize the Non-Boot Data disk¶

# Connect to VM instance using cloud shell 
gcloud compute ssh --zone "us-central1-a" "demo7-vm" --project "gcplearn9"

# List Disks
sudo df -Th

# List Devices attached to VM
sudo lsblk
dkalyanreddy@demo7-vm:~$ sudo lsblk
NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda       8:0    0   20G  0 disk 
├─sda1    8:1    0 19.9G  0 part /
├─sda14   8:14   0    3M  0 part 
└─sda15   8:15   0  124M  0 part /boot/efi
sdb       8:16   0   25G  0 disk /mnt/disks/myapp1
dkalyanreddy@demo7-vm:~$ 


# If you are using ext4, use the resize2fs command to extend the file system:
sudo resize2fs /dev/DEVICE_NAME
sudo resize2fs /dev/sdb
sudo df -h /dev/sdb
sudo df -Th

## SAMPLE OUTPUT
dkalyanreddy@demo7-vm:~$ df -h /dev/sdb
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb         25G   28K   25G   1% /mnt/disks/myapp1
dkalyanreddy@demo7-vm:~$ sudo df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
udev           devtmpfs  478M     0  478M   0% /dev
tmpfs          tmpfs      98M  388K   98M   1% /run
/dev/sda1      ext4       20G  2.0G   17G  11% /
tmpfs          tmpfs     488M     0  488M   0% /dev/shm
tmpfs          tmpfs     5.0M     0  5.0M   0% /run/lock
/dev/sda15     vfat      124M   11M  114M   9% /boot/efi
/dev/sdb       ext4       25G   28K   25G   1% /mnt/disks/myapp1
tmpfs          tmpfs      98M     0   98M   0% /run/user/1000
dkalyanreddy@demo7-vm:~$

Step-07: Stop or Delete VM to avoid charges¶

# Stop VM Instance
gcloud compute instances stop demo7-vm --zone=us-central1-a
gcloud compute instances list --filter='name:demo7-vm'

# Delete VM 
gcloud compute instances delete demo7-vm --zone=us-central1-a
gcloud compute instances list --filter='name:demo7-vm'

# Delete Disk 
gcloud compute disks list 
gcloud compute disks delete mydisk1 --zone=us-central1-a
gcloud compute disks list

Additional Reference¶

Resizing Persistent Disks