Lantean

It took me a while to shrink my EBS volume, but this post helped quite a lot.
For further reference, this are the exact steps i’ve performed:

1. Created a snapshot of the EBS volume, for backup reasons.
2. Added a new volume, based on the snapshot.
3. Added another volume with the desired size.
4. Attached both, the Normal and Shrunken volumes.
5. Check the big volume, and resize it:

   [cc]
   e2fsck -f /dev/bigvolume
   resize2fs -M -p /dev/bigvolume
   [/cc]

6. Note that ‘resize2fs’ will say something like:
   [cc]Resizing the filesystem on /dev/xvdg to 1035624 (4k) blocks.[/cc]
7. Let’s calculate how many 16MB blocks we’ll need:
   [cc]x = 1035624 * 4 / 1024 / 16 = 253[/cc]
8. Proceed copy’ing blocks to the small volume:
   [cc]dd bs=16M if=/dev/bigvolume of=/dev/smallvolume count=253[/cc]
9. Resize + Check the small volume:
   [cc]
   resize2fs -p /dev/smallvolume
   e2fsck -f /dev/smallvolume
   [/cc]
10. Stop the instance.
11. Detach the 3 volumes: Root, Big and Small.
12. Attach the Small volume at the same location as the previous root volume was. In my case, /dev/sda1.
13. Ready!

Suppose you’ve just commited a private API key that should not be public. Or maybe you just wanna restart your repository, because you’ve just finished major surgery and wanna start fresh.

If you’d like to delete all GIT history, you’d need to:

1. Remove all history

[cc]rm -rf .git[/cc]

2. Reconstruct the Git repo with only the current content

[cc]git init
git add .
git commit -m “Initial commit”[/cc]

3. Push to GitHub.

[cc]git remote add origin
git push -u –force origin master[/cc]

Source here.

You will be assimilated!