Resize mounted partition in Linux

You can resize only last partition at runtime

fdisk / gdisk

• Run sudo fdisk /dev/sda
• press p to list the partitions. Make note of the start cylinder of /dev/sda1 ex. 2048
• press d to delete existing partition
• press n to create new partition it is critical that the new partition starts at the same block as the old
• do not remove the signature
• press a and set boot flag

Reboot or use partprobe / kpartx to see new partition’s size

Resize filesystem

sudo resize2fs /dev/sda1