Raspberry Pi 4 Ubuntu 19.10 cannot enable cgroup memory at boostrap

On a Raspberry Pi 4, on a vanilla downloaded 19.10 image of Ubuntu 19 arm64, I failed trying to enable cgroup memory, needed for Kubernetes.

I created (because I don't understand well the real one, I think the 4th)

• /boot/cmdline.txt
• /boot/firmware/cmdline.txt
• /boot/firmware/btcmd.txt (modified)
• /boot/firmware/usercfg.txt (modified)

to append:

cgroup_enable=cpuset cgroup_enable=memory cgroup_memory=1

but in vain.

If I check cat /proc/cgroups the cgroup memory is disabled.

If I check cat /proc/cmdline there isn't.

How can I fix that?

Following @kremerol solution, I was able to get my RPI 4 with Ubuntu 20.04 working.

1. Run sudo nano /boot/firmware/cmdline.txt

2. Edit the default file to look like below.

    net.ifnames=0 dwc_otg.lpm_enable=0 console=serial0,115200 cgroup_enable=cpuset cgroup_enable=memory cgroup_memory=1 console=tty1 root=LABEL=writable rootfstype=ext4 elevator=deadline rootwait fixrtc
   

   NOTE: These are the 3 settings to add:

   • cgroup_enable=cpuset
   • cgroup_enable=memory
   • cgroup_memory=1

3. Save the file and reboot and the node status will change to ready.

4. You can check the status by running sudo microk8s.kubectl get nodes

I've just had this exact problem after picking up a new rpi4 on Ubuntu 19.10. After a quick poke...

The /boot/firmware/README file appears to detail the updated boot process. The second step in the process is to load /boot/firmware/config.txt which specifies /boot/firmware/nobtcmd.txt as the current cmdline.

So modify /boot/firmware/nobtcmd.txt and append: cgroup_enable=cpuset cgroup_enable=memory cgroup_memory=1. Reboot and cat /proc/cmdline

I wouldn't be surprised if some magic (maybe enabling BT?) changes the cmdline to /boot/firmware/btcmd.txt so it might be worth adding the change to that file too.

On Raspbian I had to add the following in /boot/cmdline.txt

cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory

You must add this to the end of the existing line; if you add it at the bottom of file in a new line it doesn't work.

On my Raspberry Pi 4 (ubuntu-server-20.10/arm64) I had to append the following lines to /boot/firmware/cmdline.txt:

cgroup_enable=memory cgroup_memory=1