FAQ » Servers
How to setup CentOS 7 with a OpenVZ 7 vz Logical Volume
Imagine you're making space for OpenVZ, it requires a dedicated EXT4 partition mounted on /vz.
We want to mount a specifically created logical volume, as it will be easier to extend it if required.
Before:
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 1 232.7G 0 disk
├─sda1 8:1 1 1G 0 part /boot
└─sda2 8:2 1 231.7G 0 part
├─centos-root 253:0 0 50G 0 lvm /
├─centos-swap 253:1 0 15.8G 0 lvm [SWAP]
└─centos-home 253:2 0 166G 0 lvm /home
We'll want to shrink the home mount, as it's currently taking up all the remaining disk space.
We won't really need much, as we'll only be using this server for containers.
# lvreduce --resizefs -L -10G /dev/mapper/centos-home
fsadm: Xfs filesystem shrinking is unsupported.
/usr/sbin/fsadm failed: 1
Filesystem resize failed.
Unfortunately, you can't shrink a XFS file system.
We'll take a different approach.
Assuming that your /home directory is empty or backed up.
umount /dev/mapper/centos-home
lvremove /dev/mapper/centos-home
lvcreate -L 10GB -n home centos
mkfs.xfs /dev/centos/home
mount /dev/mapper/centos-home
After:
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 1 232.7G 0 disk
├─sda1 8:1 1 1G 0 part /boot
└─sda2 8:2 1 231.7G 0 part
├─centos-root 253:0 0 50G 0 lvm /
├─centos-swap 253:1 0 15.8G 0 lvm [SWAP]
└─centos-home 253:2 0 10G 0 lvm /home
We can now create a /vz volume...
lvcreate -l 100%FREE -n vz centos
mkfs.ext4 /dev/mapper/centos-vz
mkdir /vz
mount /dev/mapper/centos-vz /vz
Now, with that done, you can add it to fstab:
echo "/dev/mapper/centos-vz /vz ext4 defaults 1 1" >> /etc/fstab
You'll have something like this:
#
# /etc/fstab
# Created by anaconda on Mon Feb 14 16:53:52 2022
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root / xfs defaults 0 0
UUID=6e71a6ec-99ff-4ec0-b15f-df8541939411 /boot xfs defaults 0 0
/dev/mapper/centos-home /home xfs defaults 0 0
/dev/mapper/centos-swap swap swap defaults 0 0
/dev/mapper/centos-vz /vz ext4 defaults 1 1
# df -hT /vz
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/centos-vz ext4 154G 61M 146G 1% /vz
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Last updated: 2022-02-21