I´ve found a work around for creating an LVM Volume on a small droplet, since they don´t come with LVM out of the box. This solution is not meant for production, as it adds a lot of I/O overhead an a bit of slowness. But for replication a system which runs LVM is good enough.
First of all, we need to create new file on the disk, which will be our virtual hard drive:
This is a 40GB Disk so it will take a while, change 4026 to 2048 if you need 20GB or 10000000 to
1000000 if you need 4G
dd if=/dev/zero of=/lvm.img bs=4096 count=10000000
After that, we wil attach it to a loop device: losetup /dev/loop0 /lvm.img
We will create just one partition on it: fdisk /dev/loop0 << EOF n p 1
22256 is the magic number where the first partition starts, so we will attach it to /dev/loop1 losetup -o 32256 /dev/loop1 /dev/loop0
That´s all :)
Now we just to create the physical volume as we were working with an actual hard drive.
pvcreate /dev/loop1 vgcreate vol_vms /dev/loop1
How it helps more poor people as me that cannot afford a bigger droplet just for the LVM feature.
PS: You can destroy your entire system if you make a mistake on most the steps.
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