Zramctl missing

frankb · December 25, 2019, 1:22pm

This might be a newbie question: I activated ZRAM using the openhabian-config tool. But when I want to check the status with zramctl I get: “-bash: zramctl: command not found”. Similar result with sudo zramctl. Im using openHAB 2.5 stable. What am I doing wrong?

mstormi · December 25, 2019, 6:32pm

Enter /sbin/zramctl or add /sbin to your path.

frankb · December 28, 2019, 9:19am

Thanks, but this does not work. It results in: -bash: /sbin/zramctl: File or Directory not found.
ls /sbin/ shows that there is no file “zramctl”. Is there a different path on Raspian? Could it be that ZRAM is not properly installed?

ljsquare · December 28, 2019, 9:53am

As far as I know ZRAM is not installed on Raspian by default, only on OpenHABian.

frankb · December 28, 2019, 10:05am

Ok. But I’m using OpenHABian. As I said: I installed ZRAM using openhabian-config.

mstormi · December 28, 2019, 12:43pm

what HW and OS? Did you use the image ?

[13:40:10] openhabian@openhabianpi:~/openhabian-zram$ dpkg -S /sbin/zramctl
util-linux: /sbin/zramctl

So install the util-linux package.

frankb · December 28, 2019, 4:21pm

I’m using Raspi 3B with Raspian:

cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 8 (jessie)"
NAME="Raspbian GNU/Linux"
VERSION_ID="8"
VERSION="8 (jessie)"
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

The util-linux package was already installed:

[17:06:59] openhabian@openHABianPi:~$ sudo apt-get install util-linux
Paketlisten werden gelesen... Fertig
Abhängigkeitsbaum wird aufgebaut.
Statusinformationen werden eingelesen.... Fertig
util-linux ist schon die neueste Version.
0 aktualisiert, 0 neu installiert, 0 zu entfernen und 4 nicht aktualisiert.

mstormi · December 29, 2019, 12:21pm

Raspbian or the openHABian image based on Raspian lite ?
A possible explanation is the util-linux package didn’t contain the zramctl binary by the time you installed.
Removing (purge, eventually) and re-adding should fix it I guess (unless you use a bad Raspbian repo).

frankb · January 2, 2020, 6:37pm

I use the openHABian image based on Raspian lite.

I purged util-linux (which is frightening due to all the warnings about uninstalling an essential package) and reinstalled it. But no change. zramctl is still not available.

BTW: If I try to uninstall ZRAM using openhabian-config I get a strange message:
A not supported option was selected (probably a programming error): " | Uninstall ZRAM"

I think I better stay away from this “feature”: never change a running system.