the single-session output on running your lines is
Last login: Wed Jul 23 13:16:35 2025
root@ubuntu:~# echo "/swapfile swap swap auto 0 0" | tee -a /etc/fstab
/swapfile swap swap auto 0 0
root@ubuntu:~# sysctl -w vm.swappiness=10
vm.swappiness = 10
root@ubuntu:~# echo 'vm.swappiness = 10' > /etc/sysctl.d/30-discourse-swap.conf
root@ubuntu:~# free -h
total used free shared buff/cache available
Mem: 7.7Gi 3.0Gi 389Mi 671Mi 4.3Gi 3.7Gi
Swap: 0B 0B 0B
root@ubuntu:~#
i then ran reboot in a VNC, and free -h returned the desired 2GB of Swap space 