According to google's documentation:
If you create or resize a root persistent disk or create a disk from an image or a snapshot, your virtual machine instance can automatically resize the partition to recognize the additional space after you restart the instance.
As long as its one of the supported OSes
CentOS 6 & CentOS 7
v20160418 or newer Yes.
These images will automatically resize root partitions up to 2 TB. Even if
the disk is larger than 2 TB, the operating system only recognizes up to 2
TB.
Source Image: centos-7-v20170523
However, /dev/sda1 does not seem to have been re-partitioned to consume the additional space.
[redacted@redacted ~]$ sudo lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 30G 0 disk
└─sda1 8:1 0 10G 0 part /
[redacted@redacted ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 10G 8.0G 2.0G 81% /
devtmpfs 3.7G 0 3.7G 0% /dev
tmpfs 3.7G 0 3.7G 0% /dev/shm
tmpfs 3.7G 8.3M 3.7G 1% /run
tmpfs 3.7G 0 3.7G 0% /sys/fs/cgroup
tmpfs 749M 0 749M 0% /run/user/1000
I have attempted to restart the instance a few times, as well as increase the size(was originally 25 but upped to 30 to try and get it to re-partition)
I've attempted xfs_growfs on the disk, but no luck there
[redacted@redacted ~]# xfs_growfs /dev/sda1 -D 7864320
meta-data=/dev/sda1 isize=256 agcount=4, agsize=655296 blks
= sectsz=4096 attr=2, projid32bit=1
= crc=0 finobt=0 spinodes=0
data = bsize=4096 blocks=2621184, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=2560, version=2
= sectsz=4096 sunit=1 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data size 7864320 too large, maximum is 2621184
I'm somewhat stumped as to why this isn't working. The only other option maybe to attach-disk it to another instance and then resize the partition form there, however I'd like to get it working this way, since the above mentioned method would be a lot more work, and is more prone to mistakes.
Best Answer
Thanks to @Faizan.
The expand-root.service was disabled, and simply needed to be enabled
sudo systemctl enable expand-root