I have centos 7 server
(CentOS Linux release 7.3.1611 (Core)) When I was updated my server I saw error you need extra space. But I had 20GB disk on server when I check disk spaces I saw only 4.5GB partition created and 16GB partition is free space no unallocated.
How I can extend partition from 16GB free space?
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT fd0 2:0 1 4K 0 disk sda 8:0 0 20G 0 disk ├─sda1 8:1 0 500M 0 part /boot └─sda2 8:2 0 4.5G 0 part ├─centos-root 253:0 0 4G 0 lvm / └─centos-swap 253:1 0 512M 0 lvm [SWAP] sr0 11:0 1 1024M 0 rom
You can do this without rebooting centos 7 Assuming your disk is /dev/vda and standard rhel/centos partitioning.
# fdisk /dev/vda
p to print your initial partition table.
d (delete) followed by
2 to delete the existing partition definition (partition 1 is usually /boot and partition 2 is usually the root partition).
n (new) followed by
p (primary) followed by
2 to re-create partition number 2 and
enter to accept the start block and
enter again to accept the end block which is defaulted to the end of the disk.
t (type) then
8e to change the new partition type to "Linux LVM".
p to print your new partition table and make sure the start block matches what was in the initial partition table printed above.
w to write the partition table to disk. You will see an error about
Device or resource busy which you can ignore.
Update kernel in-memory partition table
If you have changed your partition table run the following command to update the kernel's partition table
# partx -u /dev/vda
Resize physical volume
Resize the PV to recognize the extra space
# pvresize /dev/vda2
Resize LV and filesystem
In this command
centos is the PV,
root is the LV and
/dev/vda2 is the partition that was extended. Use
lvs commands to see your physical and logical volume names if you don't know them. The
-r option in this command resizes the filesystem appropriately so you don't have to call
# lvextend -r centos/root /dev/vda2