Unable to resize ec2 ebs root volume
- by nathanjosiah
I have followed many of the tutorials that pretty much all say the same thing which is basically:
Stop the instance
Detach the volume
Create a snapshot of the volume
Create a bigger volume from the snapshot
Attach the new volume to the instance
Start the instance back up
Run resize2fs /dev/xxx
However, step 7 is where the problems start happening. In any case running resize2fs always tells me that it is already xxxxx blocks big and does nothing, even with -f passed. So I start to continue with tutorials which all basically say the same thing and that is:
Delete all partitons
Recreate them back to what they were except with the bigger sizes
Reboot the instance and run resize2fs
(I have tried these steps both from the live instance and by attaching the volume to another instance and running the commands there) The main problem is that the instance won't start back up again and the system error log provided in the AWS console doesn't provide any errors. (it does however stop at the grub bootloader which to me indicates that it doesn't like the partitions(yes, the boot flag was toggled on the partition with no affect)) The other thing that happens regardless of what changes I make to the partitions is that the instance that the volume is attached to says that the partition has an invalid magic number and the super-block is corrupt. However, if I make no changes and reattach the volume, the instance runs without a problem.
Can anybody shed some light on what I could be doing wrong?
Edit
On my new volume of 20GB with the 6GB image,df -h says:
Filesystem Size Used Avail Use% Mounted on
/dev/xvde1 5.8G 877M 4.7G 16% /
tmpfs 836M 0 836M 0% /dev/shm
And fdisk -l /dev/xvde says:
Disk /dev/xvde: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x7d833f39
Device Boot Start End Blocks Id System
/dev/xvde1 1 766 6144000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/xvde2 766 784 146432 82 Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
Also, sudo resize2fs /dev/xvde1 says:
resize2fs 1.41.12 (17-May-2010)
The filesystem is already 1536000 blocks long. Nothing to do!
