Install from Bullseye

doc

Allow pam user to connect to the web api as admin

$ sudo cat /etc/pve/user.cfg
user:userid@pam:1:0::::::

acl:1:/:userid@pam:Administrator:

Change the ssl cert of the web gui:

Replace /etc/pve/local/pve-ssl.key and /etc/pve/local/pve-ssl.pem

Networking

See the networking section for Debian, but you cannot put files in /etc/network/interfaces.d/, only edit /etc/network/interfaces.

Iso

Iso are stored in /var/lib/vz/template/iso/ by default