Expand Boot volume on / partition in OCI
By default, only 38gb is assigned to / partition in Oracle cloud Instance, though boot volume can be assigned to bigger volume at the time of instance creation.
To get the all assigned volume on / partition, you need to install growpart and extend the partition using below commands:
# sudo yum -y install cloud-utils-growpart gdisk
# sudo growpart /dev/sda 3
You need to reboot the instance to take this effect on the instance.