Author: admin

This error occurs when we remove a node from the cluster.

If the cluster has 2 nodes and the two nodes are mentioned to access the quorum.

After removing a node from the cluster only a single node is active. Thus the quorum permission becomes a read-only state.

To resolve the error we change the node from 2 to 1 in the default configuration.

The sample error looks like:

Cluster not ready – no quorum? (500)

First we login to the Proxmox server.

Then we check the state of the cluster using the command

pvecm status

From the result, we find that the Quorum activity is blocked.

Thus we execute the below command to change the votes from 2 to 1.

pvecm expected 1

After executing the command we will be able to delete the VM.

If the VM gets locked during the process, we unlock the VM using the command

qm unlock

Now if you want, you can delete cluster width this commands:

systemctl stop pve-cluster corosync
pmxcfs -l
rm /etc/corosync/*
rm /etc/pve/corosync.conf
killall pmxcfs
systemctl start pve-cluster

Or you can remove only one node from cluster with this documentation:

https://pve.proxmox.com/wiki/Cluster_Manager#_remove_a_cluster_node

In this lesson we install Arch Linux on encrypted btrfs volume step by step.

1. Show all volumes on hard drive:

ls /dev/sd*

2. Delete all volumes on drive /dev/sda

fdisk /dev/sda

Next write letter (d) -> number of volume and then write changes (w)

3. Create some partitions with command cfdisk:
– First partition: 256M, type: EFI System
– Second partition: 512M
– Third partition: full size of disk

Write changes, type yes and exit from cfdisk.

4. Now let’s create file system and encrypt on our partitions:

mkfs.vfat -n "EFI System" /dev/sda1

mkfs.ext4 -L boot /dev/sda2

mkfs.ext4 -L root /dev/sda3

We successfully created three partitions – efi, boot and root.

Now we need to encrypt our root partition:

modprobe dm-crypt
modprobe dm-mod

cryptsetup luksFormat -v -s 512 -h sha512 /dev/sda3

Type YES in capital letters and password for encrypted partition.

5. Open our encrypted partition:

cryptsetup open /dev/sda3 archlinux

6. Create btrfs partition on our encrypted partition:

mkfs.btrfs -L root /dev/mapper/archlinux

7. Mount

mount -t btrfs /dev/mapper/archlinux /mnt
cd /mnt

8. Create subvolumes for btrfs partition

btrfs subvolume create root
btrfs subvolume create home
btrfs subvolume create snapshots

Go to / and unmount /mnt

cd /
umount -R /mnt

8. Mount

mount -t btrfs -o subvol=root /dev/mapper/archlinux /mnt

Create home and snapshots directories:

mkdir /mnt/home
mkdir /mnt/snapshots

Mount home and snapshots directories

mount -t btrfs -o subvol=home /dev/mapper/archlinux /mnt/home
mount -t btrfs -o subvol=snapshots /dev/mapper/archlinux /mnt/snapshots

Create boot directories:

mkdir /mnt/boot
mkdir /mnt/boot/efi

Show partitions:

lsblk

Mount boot directories:

mount /dev/sda2 /mnt/boot
mount /dev/sda1 /mnt/boot/efi

9. Create swap file:

dd if=/dev/zero of=swap bs=1M count=1024
chmod 0600 swap
mkswap swap
swapon swap

10. Install Arch Linux to /mnt directory:

pacstrap -i /mnt base base-devel efibootmgr grub linux linux-firmware networkmanager vim mc 

11. Generate fstab

genfstab -U /mnt > /mnt/etc/fstab

12 Arch chroot to our new system:

arch-chroot /mnt

13. Change root password:

passwd

14. Uncomment locales in /etc/locale.gen file

vim /etc/locale.gen

Generate locale:

locale-gen
echo LANG=en_US > /etc/locale.conf

15. Configure grub boot loader

vim /etc/default/grub

In line GRUB_CMDLINE_LINUX=”” write this text:

GRUB_CMDLINE_LINUX="cryptdevice=/dev/sda3:archlinux"

Change file /etc/mkinitcpio.conf: in line HOOKS add encrypt

HOOKS=(... encrypt ...)

mkinitcpio -p linux

Configure grub bootloader:

grub-install --boot-directory=/boot --efi-directory=/boot/efi /dev/sda2
grub-mkconfig -o /boot/grub/grub.cfg
grub-mkconfig -o /boot/efi/EFI/arch/grub.cfg