Extending Amazon AWS EC2 instance volumes

Step-by-step tutorial on how to extend EC2 instance volumes with zero downtime.

I did write this tutorial for my team's wiki some time ago and thought that I could share it here. Skip to the end of the article to see a short version :)

Long version

Open Elastic Block Storage -> Volumes in EC2 instances. Select the volume you want to extend and click Actions -> Modify Volume.

Enter a new volume size in the input field, and save it.

Connect to EC2 instance using your terminal.

Check current volume size:

rytis@aws:~$ lsblkNAME        MAJ:MIN RM SIZE RO TYPE MOUNTPOINTnvme0n1     259:0    0  40G  0 disk └─nvme0n1p1 259:1    0  30G  0 part /

Extend partition on volume:

rytis@aws:~$ sudo growpart /dev/nvme0n1 1CHANGED: partition=1 start=2048 old: size=62912479 end=62914527 new: size=83883999,end=83886047

Confirm that the new partition size is updated:

rytis@aws:~$ lsblkNAME        MAJ:MIN RM SIZE RO TYPE MOUNTPOINTnvme0n1     259:0    0  40G  0 disk └─nvme0n1p1 259:1    0  40G  0 part /

Check on filesystems type and size:

rytis@aws:~$ df -ThFilesystem     Type      Size  Used Avail Use% Mounted onudev           devtmpfs  3.8G     0  3.8G   0% /devtmpfs          tmpfs     764M   81M  683M  11% /run/dev/nvme0n1p1 ext4       30G   26G  3.5G  89% /tmpfs          tmpfs     3.8G  8.0K  3.8G   1% /dev/shmtmpfs          tmpfs     5.0M     0  5.0M   0% /run/locktmpfs          tmpfs     3.8G     0  3.8G   0% /sys/fs/cgrouptmpfs          tmpfs     764M     0  764M   0% /run/user/1002

A. If filesystem type is ext2, ext3 or ext4:

rytis@aws:~$ sudo resize2fs /dev/nvme0n1p1resize2fs 1.42.13 (17-May-2015)Filesystem at /dev/nvme0n1p1 is mounted on /; on-line resizing requiredold_desc_blocks = 2, new_desc_blocks = 3The filesystem on /dev/nvme0n1p1 is now 10485499 (4k) blocks long.

Confirm that partition was extended:

rytis@aws:~$ df -hFilesystem      Size  Used Avail Use% Mounted onudev            3.8G     0  3.8G   0% /devtmpfs           764M   81M  683M  11% /run/dev/nvme0n1p1   39G   26G   14G  66% /tmpfs           3.8G  8.0K  3.8G   1% /dev/shmtmpfs           5.0M     0  5.0M   0% /run/locktmpfs           3.8G     0  3.8G   0% /sys/fs/cgrouptmpfs           764M     0  764M   0% /run/user/1002

B. If filesystem type is XFS:

1. If xfsprogs is not installed, install it:

sudo apt install xfsprogs

2. Extend partition:

sudo xfs_growfs -d /

3. Confirm changes:

rytis@aws:~$ df -hFilesystem      Size  Used Avail Use% Mounted onudev            3.8G     0  3.8G   0% /devtmpfs           764M   81M  683M  11% /run/dev/nvme0n1p1   39G   26G   14G  66% /tmpfs           3.8G  8.0K  3.8G   1% /dev/shmtmpfs           5.0M     0  5.0M   0% /run/locktmpfs           3.8G     0  3.8G   0% /sys/fs/cgrouptmpfs           764M     0  764M   0% /run/user/1002

TL;DR;

sudo sulsblkgrowpart /dev/nvme0n1 1df -Thresize2fs /dev/nvme0n1p1df -h

Even shorter:

sudo sugrowpart /dev/nvme0n1 1 && resize2fs /dev/nvme0n1p1 && df -h

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