Upgrade Proxmox Cluster from 7 to 8

Do following steps to upgrade Proxmox cluster from version 7 to version 8.

Node2

1. Update the second node to the latest 7.4.x version

Add no subscription repository to the file etc/apt/sources.list:

deb http://download.proxmox.com/debian/pve bullseye pve-no-subscription

Upgrade to the latest 7.4.x:

apt upgate
apt upgrade
apt dist-upgrade

Check the result:

pveversion

2. Migrate all VMs and CTs to Node1

3. Upgrade second node to the version 8

3.1 Run check script:

pve7to8 --full

Check for output and resolve errors and warnings.

3.2 Update Debian Base Repositories to Bookworm:

sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list

Ensure that there are no remaining Debian Bullseye specific repositories left

3.3 Refresh Package Index:

apt update

3.4 Upgrade the system to Debian Bookworm and Proxmox VE 8.0:

apt dist-upgrade

Follow the process

3.5 Check the results:

pveversion
reboot

3.6 Run check script after reboot:

pve7to8

Node1

1. Update the first node to the latest 7.4.x version

Add no subscription repository to the file etc/apt/sources.list:

deb http://download.proxmox.com/debian/pve bullseye pve-no-subscription

Upgrade to the latest 7.4.x:

apt upgate
apt upgrade
apt dist-upgrade

Check the result:

pveversion

2. Migrate all VMs and CTs to Node2

3. Upgrade first node to the version 8

3.1 Run check script:

pve7to8 --full

Check for output and resolve errors and warnings.

3.2 Update Debian Base Repositories to Bookworm:

sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list

Ensure that there are no remaining Debian Bullseye specific repositories left

3.3 Refresh Package Index:

apt update

3.4 Upgrade the system to Debian Bookworm and Proxmox VE 8.0:

apt dist-upgrade

Follow the process

3.5 Check the results:

pveversion
reboot

3.6 Run check script after reboot:

pve7to8

After Upgrade

1. Check all cluster nodes are Up and running.
2. Migrate VMs and CTs to the initial place.