By default seems there is no /etc/sysctl.conf so you will get this

error: sysctl: cannot open "/etc/sysctl.conf": No such file or directory

Author: dngray

Proxmox-8.sh

@@ -87,7 +87,7 @@ proxmox-boot-tool refresh
 # Kernel hardening
 curl -s https://raw.githubusercontent.com/Metropolis-nexus/Common-Files/main/etc/modprobe.d/server-blacklist.conf | tee /etc/modprobe.d/server-blacklist.conf > /dev/null
 curl -s https://raw.githubusercontent.com/Metropolis-nexus/Common-Files/main/etc/sysctl.d/99-server.conf | tee /etc/sysctl.d/99-server.conf > /dev/null
-sysctl -p
+sysctl -p /etc/sysctl.d
 
 # Rebuild initramfs
 update-initramfs -u
@@ -112,4 +112,4 @@ curl -s https://raw.githubusercontent.com/Metropolis-nexus/Common-Files/refs/hea
 tuned-adm profile virtual-host
 
 # Enable fstrim.timer
-systemctl enable --now fstrim.timer
+systemctl enable --now fstrim.timer