disk_resizer
automagic online resize for your partitions
Example Usage:
For most systems, use the base device name (without /dev/):
docker run -it --rm --privileged guruvan/resizefs:v0.0.4 xvda
or On Some systems (i.e. AWS PV hosts (t1.micro etc) you may not have /dev/xvda or /dev/sda and may only have /dev/xvda1
docker run -it --rm --privileged guruvan/resizefs:v0.0.4 xvda1