Managing Partition Tables, Partitions, LVM VGs/PVs/LVs, and Filesystems

asked 2015-04-14 18:55:35 -0500

Naftuli Tzvi Kay gravatar image

For all of my servers I'm currently running in EC2, I have the following process:

# create partition label
parted /dev/xvdb mklabel gpt
# create partition filling disk
parted /dev/xvdb mkpart primary 2048s 100%
# install LVM
[apt-get|yum] install lvm2
if [ centos ]; then
    service lvm2-lvmetad start
    service lvm2-monitor start
# create LVM PV
pvcreate /dev/xvdb1
# create or extend the LVM volume group
if vgdisplay elasticsearch ; then
    vgextend elasticsearch /dev/xvdb1
    vgcreate elasticsearch /dev/xvdb1
# create an LVM LV
lvcreate -l 100%FREE -n runtime elasticsearch
# install btrfs
[apt-get|yum] install [btrfs-tools|btrfs-progs]
# create BTRFS filesystem
mkfs.btrfs -L "Elastic Search Runtime" /dev/mapper/elasticsearch-runtime
# mount the BTRFS filesystem in a temporary directory in order to create subvolume
TEMPDIR="$(mktemp -d)"
mount -t btrfs -o defaults,ssd,compress=lzo /dev/mapper/elasticsearch-runtime $TEMPDIR
# make subvolume
btrfs create subvolume $TEMPDIR/root
# unmount
umount $TEMPDIR
rmdir $TEMPDIR
# make new directory for mountpoint
mkdir -p /srv/elasticsearch
# add to fstab
echo "/dev/mapper/elasticsearch-runtime   /srv/elasticsearch   btrfs   defaults,ssd,compress=lzo,subvol=root   0   0" >> /etc/fstab
# reload mounts
mount -a
# done

It should be pretty self-evident that this process is painful and sucks. I need this process to run once for every "volume" I create. I have multiple volumes for elasticsearch-data1, elasticsearch-data2, and so on, for which this process is repeated.

I'm having a hard time finding modules in the forge which will do this for me. I've found the LVM module, but then I lose disk alignment with parted and GPT. There's no BTRFS module for creating/managing subvolumes, and no solid module for fstab that I've found. It seems that most Puppet work is considered to start after you've done setup of your machine, which isn't really an option for my current work.

Is there something I'm missing, or do I have to write modules to manage parted, btrfs, and more, and then just chain the dependencies in order?

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