How to add Rocky Linux (& Other not supported Linux Flavors) to ControlUp

Disclaimer: I am a ControlUp employee but am posting this on my own. We officially only support the Linux flavors here: https://support.controlup.com/hc/en-us/articles/360001497917-Linux-Integration-with-ControlUp

Disclaimer 2: I am NOT a Linux expert, I consider myself a basic user for most Linux things.

With the recent rise of the truly community driven (beta) releases of Rocky Linux I thought it was time to see what would be needed to add Rocky Linux to the ControlUp console. If you want to know more about how and what with Rocky Linux I recommend reading my good friend Angelo Luciani’s blog post here. TLDR: Rocky Linux is a project from one of the CentOS co-founders and is supposed to be enterprise grade once GA is reached.

Adding the linux machines to ControlUp

Fixing Linux to work with ControlUp

Adding linux machines to ControlUp

To compare the process with CentOS 7, 8 and Ubuntu 2004 LTS I have deployed fresh vm’s for these distributions. For Rocky and the CentOS vm’s I selected Server with a GUI, for Ubuntu I picked the default installation. All of them got 1 cpu, 2GB ram and 64GB disk space (overkill, yes I know). I also added the same user to all of them during the deployment. Network wise I just gave them a proper host name and selected dhcp as that was enough for this test.

The setup screen for Rocky Linux

To be able to add unsupported Linux Flavors you need to enable this in Settings > Agents

After deploying all 4 of the vm’s I added them to the ControlUp console with the same Linux Data collector.

I could use another credential that I setup in the past for my domoticz & Unify linux machines, after this click add to add the machines.

I entered the ip range to scan, hit scan, selected the 4 linux machines (note: CentOS 8 is not being reported as a not supported flavor, I have reported a bug for this), click add and hit ok twice.

By default the CentOS 7 machine is the only one working correctly.

if you see some weird negative number for CPU make sure to check your locale settings that it is the same as the regional settings on your Console/Monitor.

Now let’s make sure we get proper metrics in the console 🙂

Fixing Linux machines to work with ControlUp

Rocky Linux needs the same fixes as CentOS 8, Ubuntu needs another step.

  1. Install gcc : for CentOS / Rock
    sudo yum install gcc

    or for Ubuntu

    sudo apt-get install gcc
  2. run
    ps -V
    1. if the output has ps from procps you need to remember the number 6
    2. If the output has ps from procps-ng you need to remember the number 7
  3. Create a file called a.c
    1. run:
      nano a.c

      (or vi, whatever you like)

    2. Add:
      1. #include <stdio.h> 
        int main() 
        {
          printf("6\n");
          return 0;
        }

        replace the 6 with 7 if you had procps-ng in the previous step

    3. save this file
  4. run:
    gcc a.c
  5. run:
    sudo cp a.out /bin/rpm
  6. Install sysstat: For Rocky Linux / CentOS
    sudo yum install sysstat

    or for Ubuntu

    sudo apt-get install sysstat
  7. Reboot ( yes I needed this)

For Rocky Linux and CentOS you’re done

For Ubuntu you will also need to install ifconfig from net-tools before the reboot

  1. run:
    sudo apt-get install net-tools

For me this was enough to have all four of these machines look properly in the ControlUp Console. Remember we might not officially support this way of working but it works good