Just to remember myself: How to a resize a file system at runtime on Ubuntu. In this example I want to increase the size of /dev/sda3 - my root partition on a virtual dev system.
- Extend the "physical" disk, in my case in VMware vSphere
- Then run then following commands as root
- echo 1 > /sys/block/sda/device/rescan # make sure the OS rescan the disc
- growpart /dev/sda 3 # grow the partition on the disk
- resize2fs /dev/sda3 # grow the file system on the partition