How do I install MicroK8s for Camio Flex?

These are instructions for installing MicroK8s, a Kubernetes distribution used for deploying Camio Flex, on Linux.

Prerequisites

Before installing, be sure your system meets the minimum requirements and has access to the hostnames required.

  • According to MicroK8s official documentation: MicroK8s runs in as little as 540MB of memory, but to accommodate workloads, we recommend a system with at least 20G of disk space and 4G of memory.
  • Connection to the internet

The above are the bare minimum requirements to install microk8s. Camio Flex requires the above requirements along with the following:

  • Current estimates are around 1gb/stream of memory + 1cpu core/stream + 10gb/stream of disk space. Ideally with 20% extra for usage spikes and overhead. 
  • Adding local storage is also an option, and a recommendation of an additional 50-100gb/stream 
  • Flex is also not recommended on systems with less than 4 cores at the moment.

The system must also be running Ubuntu, preferably no older than version 20.04.

Hostnames for microk8s

Your firewall must permit access to these additional hostnames.

  • api.snapcraft.io
  • public.apps.ubuntu.com
  • snapcraft.io
  • fastly.cdn.snapcraft.io

Installing Microk8s

Camio Flex is tested on Microk8s version 1.23 

  1. To install it, use snap install:
    sudo snap install microk8s --classic --channel=1.23/stable
  2. By recommendation of MicroK8s, add the active user to the microk8s group and own .kube:
    sudo usermod -a -G microk8s $USER
    sudo chown -f -R $USER ~/.kube
  3. Check to see the status:
    sudo microk8s status
  4. Now we will enable the required addons:
    sudo microk8s enable dns storage helm3
  5. If you would like a k8s gui, you can also add the dashboard package:
    sudo microk8s enable dashboard
  6. The next step is to edit the kublet file. This is usually found at the following path:
    /var/snap/microk8s/current/args/kubelet
  7. Add or edit these values in the kubelet file:
    --max-pods=10000
    --log-file-max-size=1000
    --log-flush-frequency=3
    --container-log-max-files=1
  8. Then reset the kubelet service:
    sudo service snap.microk8s.daemon-kubelet restart
  9. You can use the microk8s status command to check when microk8s is back up:
    sudo microk8s status
    MicroK8s should now be installed and set up properly for use with Camio Flex.
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