Expanding RAM on a Linux system without rebooting
This assumes that you are running your Linuxsystem as a virtual server on VMWare, KVM, XEN or AHV.
We have been there a couple of times – your application need more RAM. Or just want more RAM in order to have your Minecraft server run smoothly.
- First of all, add the amount of RAM to your VM via your hypervisor.
- Second, we need to tell the kernel that there is more RAM available for use, we can do that by using this simple script:
for f in /sys/devices/system/memory/memory*/state ; do
grep -v -q online $f || continue
echo -n "Bringing $f online... "
echo online > $f || continue
That's all! You can now verify with your favorite way to check RAM usage.