Below are my steps for re-sizing the / partition for an AWS CentOS 6.5 x64 Instance.
Most all of the AWS instances start off as 15GB or smaller / partitions. Being able to resize to take advantage of a larger disk is great.
Please use these directions at your own risk! Keep backups or create a snapshot before you start to ensure if you do something wrong you can recover, reset, or back out.
Here are the steps I followed, and below is how I ran them each:
- As root, go into `fdisk /dev/xvda` and create a new primary partition n for new then p for primary 3 for 3rd partition number and enter for size
- t for tag it (t) as type 0x8e and then w for write
- Write your changes and exit fdisk
- Reboot = you may not be able to use the new partition until you reboot
- When the reboot completes, as root again,
- Run pvcreate on your new partition to create the physical partition
- Use vgextend to add the new PV to your existing Volume Group
- Now you have free space available in the VG
- Run lvextend to add some space to /dev/mapper/VolGroup-lv_root = this adds your new space to the logical volume
- Run `resize2fs /dev/mapper/VolGroup-lv_root`
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First Verify you have the extra space by looking at the physical drives:
lsblk = will show you the raw disk space.
Then create a new partition from the available free space on the drive
[root@ip-172-31-36-49 ~]# fdisk /dev/xvdf
n
p
3
enter for default size = remaining amount
t 0x8e
w = write it out and exit
reboot server
[root@ip-172-31-36-49 ~]# pvcreate /dev/xvdf3
Physical volume “/dev/xvdf3” successfully created
pvdisplay = show physical volumes verify you have the remaining disk space
[root@ip-172-31-36-49 ~]# vgdisplay
— Volume group —
VG Name VolGroup
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 7
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 14.51 GiB
PE Size 4.00 MiB
Total PE 3714
Alloc PE / Size 3714 / 14.51 GiB
Free PE / Size 0 / 0
VG UUID lvi8Kt-MMja-nTvI-terh-7ljb-ImyV-SScwRk
[root@ip-172-31-36-49 ~]# vgextend VolGroup /dev/xvdf3
Volume group “VolGroup” successfully extended
[root@ip-172-31-36-49 ~]# vgdisplay VolGroup
— Volume group —
VG Name VolGroup
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 8
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 89.02 GiB
PE Size 4.00 MiB
Total PE 22788
Alloc PE / Size 3714 / 14.51 GiB
Free PE / Size 19074 / 74.51 GiB
VG UUID lvi8Kt-MMja-nTvI-terh-7ljb-ImyV-SScwRk
[root@ip-172-31-36-49 ~]# lvextend -l +100%FREE /dev/mapper/VolGroup-lv_root
Extending logical volume lv_root to 88.22 GiB
Logical volume lv_root successfully resized
lvdisplay = verify the lv size is bigger now
[root@ip-172-31-36-49 ~]# resize2fs /dev/mapper/VolGroup-lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 6
Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 23126016 (4k) blocks.
The filesystem on /dev/mapper/VolGroup-lv_root is now 23126016 blocks long.
vgdisplay = verify the VolGroup is now bigger
[root@ip-172-31-36-49 ~]# df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
87G 1.4G 82G 2% /
[root@ip-172-31-36-49 ~]#
CentOS-6.5-Base-HVM-SR-IOV-1/30/2015 – ami-09f7d239
[Copied ami-e4b7f18c from us-east-1] CentOS-6.5-Base-HVM-SR-IOV-1/30/2015
Root device type: ebs Virtualization type: hvm
Thanks to the following resources:
post by Trevor H @ https://www.centos.org/forums/viewtopic.php?f=13&t=44616
PVCreate @ http://linux.die.net/man/8/pvcreate
Display Volume Groups @ redhat.com
Grow Logical Volumes @ centos.org
Managing Partitions at How To Geek @ howtogeek.com
Display Physical Volumes @ Redhat.com