Uly.me

cloud engineer

Resizing XFS root partition in GCP

How to resize a root partition in GCP.

Increase disk size.

gcloud compute disks resize server-boot-disk-name \
--size=50GB \
--zone us-central1-c \
--project your-project-id

Run growpart.

growpart /dev/sda 1

Run xfs_growfs.

xfs_growfs /dev/sda1

To verify, run these.

lsblk
df -Th

GRUB Fixes

This are grub fixes to servers that are not booting up due to improper entries in the grub menu.

grub --batch <<END
root (hd0,0)
setup (hd0,0)
quit
END
#
sed -i 's/dev\/sda/dev\/hda/' /boot/grub/device.map
sed -i 's/(hd0)/(hd0,0)/' /boot/grub/menu.lst

The fix includes replacing (hd0) with (hd0,0) and /dev/sda with /dev/hda.

Windows Boot Time

Here’s how to find when a Windows server was last rebooted.

systeminfo | find /i "boot time"

Add nofail

The /etc/fstab file allow volumes to be automatically mounted on bootup. Add nofail in your automated mounts to prevent instances from hanging on boot. Nofail makes the instance to boot even if there are errors with the mounted volume.

UUID=aebf131c-6957-451e-8d34-ec978d9581ae  /data  xfs  defaults,nofail  0  2

Extend Linux Boot

The following commands will extend Linux Boot drive without a reboot.

List block devices. Check disk sizes.

lsblk
df -h

Determine file system type: xfs, ext2, ext3 or ext4.

file -s /dev/xvda1
# or
df -Th

Extend volume from the console or command line.

aws ec2 modify-volume --region us-east-1 \
--volume-id vol-xxxxxxxxxxxx --size 10 \
--volume-type gp2

Resize Linux partition.

# for /dev/xvda1
growpart /dev/xvda 1
# for /dev/xvda2
growpart /dev/xvda 2
# for ext2, ext3, ext4
resize2fs /dev/xvda1
# for xfs 
xfs_growfs /dev/mapper/root
xfs_growfs /dev/xvda1

Check if new file size is being displayed.

lsblk
df -Th