increase google cloud disk size. After increasing size from the console. it shows different results.
1. lsblk shows sba 2 has 30G of disk.
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 35G 0 disk
├─sda1 8:1 0 200M 0 part /boot/efi
└─sda2 8:2 0 34.8G 0 part /
However, df -k shows sda2 only has 20G.