https://www.reddit.com/r/Proxmox/comments/yy0kha/confused_on_when_to_use_vm_vs_lxc/

Manual.

root:~# pveam available --section system
system          centos-9-stream-default_20221109_amd64.tar.xz
system          debian-11-standard_11.7-1_amd64.tar.zst
system          debian-12-standard_12.2-1_amd64.tar.zst
...
 
root:~# pveam list local
NAME                                                         SIZE  
local:vztmpl/alpine-3.19-default_20240207_amd64.tar.xz       2.84MB
local:vztmpl/debian-12-standard_12.2-1_amd64.tar.zst         120.29MB

Well, it's possible to do it by CLI, but the web GUI is just much useful.

Useful commands:

• Copy file from host to container: pct push <VMID> <FILE> <DESTINATION>

From vanilla Debian:

root:~# apt update && apt upgrade
root:~# apt install vim
root:~# vim .bashrc  # ll
 
# Get IP address
root:~# ip a
 
# Stop SSH and Postfix services
root:~# postfix stop
root:~# systemctl stop sshd

• LXC containers do not need passwords, since user already authenticated on host. Enter root shell using lxc-attach <ID> or pct enter <ID>
• Script provided by tteck himself to disable password authentication. Not tested.
  • Alternatively, remove the password with bash -c "passwd -d root".

GETTY_OVERRIDE="/etc/systemd/system/container-getty@1.service.d/override.conf"
mkdir -p $(dirname $GETTY_OVERRIDE)
cat <<EOF >$GETTY_OVERRIDE
[Service]
ExecStart=
ExecStart=-/sbin/agetty --autologin root --noclear --keep-baud tty%I 115200,38400,9600 \$TERM
EOF
systemctl daemon-reload
systemctl restart $(basename $(dirname $GETTY_OVERRIDE) | sed 's/\.d//')