leifmadsen/atomic-resize-root.md

## atomic-resize-root.md

      
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              atomic-resize-root.md
            
          
    Resizing CentOS Atomic /dev/atomicos/root disk

I found out that the default Atomic root disk is only 3GB! That causes all sorts of problems on the master when you
try to spin up more than a handful of things (you get disk pressure errors, and things end up not spinning up properly).

NOTE
You'll need to make sure you have libguestfs-xfs package installed or virt-resize won't be able to expand the XFS
partition.

# install deps
yum install libguestfs-tools libguestfs-xfs -y

# check filesystem info (and validate commands run)
virt-filesystems --long -h --all -a CentOS-7-x86_64-GenericCloud.qcow2

# create new image with proper size
qemu-img create -f qcow2 CentOS-7-x86_64-GenericCloud-resized.qcow2 30G

# resize old image into new image
virt-resize --expand /dev/sda2 \
  --LV-expand /dev/atomicos/root \
  CentOS-7-x86_64-GenericCloud.qcow2 CentOS-7-x86_64-GenericCloud-resized.qcow2
  
# check image
qemu-img info CentOS-7-x86_64-GenericCloud-resized.qcow2
virt-filesystems --long -h --all -a CentOS-7-x86_64-GenericCloud-resized.qcow2

# overwrite old image
mv CentOS-7-x86_64-GenericCloud-resized.qcow2 CentOS-7-x86_64-GenericCloud.qcow2


NOTE
I was also having some issues with getting libguestfs-tools to access the image
and ultimately I think it was an outdated LVM package, but I ran the following
yum update commands to get things working.

yum update libvirt* lvm*