Increasing disk space without downtime.
So in our team, we had to resize an instance disk because it's getting full, this is our experience.
For the first time we search on how to do this, there's many article written about it and most of them requires to stop the system and detaching a volume. But there must be a real docs from aws itself, that is most likely up to date.
After more searching, we found this link: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-modify-volume.html
From there, it seems like we can modify it on the fly since our instance is current generation, so that's good news.
Since we mount the whole volume, we didn't need to extend a partition table. You only have to use the
The list of block devices attached to our instance:
$ lsblk -f NAME FSTYPE LABEL UUID MOUNTPOINT xvda └─xvda1 ext4 cloudimg-rootfs b6adc449-5e3d-4331-ba6b-xxxx / xvdb ext4 85a58c7a-d914-4b85-be3c-xxxx /opt/
And here's the resize command.
$ sudo resize2fs /dev/xvdb resize2fs 1.42.13 (17-May-2015) Filesystem at /dev/xvdb is mounted on /opt/couchdb; on-line resizing required old_desc_blocks = 4, new_desc_blocks = 10 The filesystem on /dev/xvdb is now 39321600 (4k) blocks long.
This was very nice and smooth experience and we are glad for this functionality, thank you AWS team and whoever made this possible.