Increasing LVM disk space

extend_lvm.txt

# inspired from
# https://www.transip.nl/vragen/446-mijn-partitie-via-lvm-vergroten/
# first, check that you have lvm installed
sudo lvdisplay
# if you get nothing, you don't have lvm and you don't have a lot of options


# check you actually have additional free space
sudo parted /dev/vda
# you can then use, inside parted
print free
# to check if you have the additional space you want

# create new partition
sudo fdisk /dev/vda
p # to display current parititions
# check out the End column for the biggest number in there
n # to create new partition
p # for primary
# pick a number for your partition based on available ones, let's say 4

# the new parition needs to end at the NEXT AVAILABLE cylinder, so the biggest number you looked for before on the last parition + 1
t # to set the parition type 
# put in the parition number, we said 4
8e # this is LVM

p # to check everything's ok
w # to save changes, might get some warnings, worry not

reboot # to activate changes

# create physical volume group
pvcreate /dev/vda # /dev/vda4 in our case
sudo lvdisplay # to see logical volumes - save LV Path and VG Name
sudo vgextend <VG Name> /dev/vdaX # X is the partition number
sudo lvextend -l +100%FREE <LV Path> 
sudo resize2fs <LV Path>
reboot

I've found this to be a bit more straight forward and intuitive: http://sirlagz.net/2016/01/20/live-resizing-lvm-on-linux/ .

Another useful article for when you get "Can't have overlapping partitions" https://www.openattic.org/posts/resize-lvm-inside-an-extended-partition/