[Appendix] Install MicroK8s single-node Kubernetes system

MicroK8s is a low-ops, minimal production Kubernetes for devs, cloud, clusters, workstations, edge, and IoT.

In this section, you will install and verify a MicroK8s installation.

Install MicroK8s

PrimeHub provides an easy installation script to install MicroK8s.

Download the script primehub-install from Github.

git clone <https://github.com/InfuseAI/primehub.git>

Run the following command to install MicroK8s.

Default k8s version: 1.24 Support k8s version: 1.21~1.26
```
./primehub/install/primehub-install create singlenode --k8s-version (1.21~1.26)
```
After the first execution, you will see the following message.
```
[Require Action] Please relogin this session and run create singlenode again
```
Please run the following command line to continue the installation. This step is required because the user need to be added to the microk8s group.
```
sudo usermod -a -G microk8s $USER
newgrp microk8s
```
Check if the user has joined the microk8s group:
```
id
uid=1000(ubuntu) gid=1001(microk8s) groups=1001(microk8s).....
```
After logging back in, rerun the same command to finish the single-node MicroK8s provision.
```
./primehub/install/primehub-install create singlenode --k8s-version (1.21~1.26)
```
When you see the following message, then you have install microk8s service on your server successfully.
```
[Completed] Create Single Node K8S
```

Verify MicroK8s installation

Use the following command line to check the status.

./primehub/install/primehub-install status singlenode

→ You will get the result:

[K8S] Free Disk Space
Filesystem      Size  Used Avail Use% Mounted on
/dev/root        29G  4.6G   25G  16% /
[K8S] Node Status
NAME               STATUS   ROLES    AGE    VERSION                     INTERNAL-IP     EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION    CONTAINER-RUNTIME
ip-172-31-18-202   Ready    <none>   3m6s   v1.24.12-2+36e803be0d732b   172.31.18.202   <none>        Ubuntu 20.04.5 LTS   5.15.0-1028-aws   containerd://1.5.13
[StorageClass] Storage Class
NAME                          PROVISIONER            RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
microk8s-hostpath (default)   microk8s.io/hostpath   Delete          WaitForFirstConsumer   false                  2m24s
[Helm] Helm list
NAME            NAMESPACE       REVISION        UPDATED                                 STATUS          CHART                   APP VERSION
nginx-ingress   ingress-nginx   1               2023-03-24 03:53:13.165344921 +0000 UTC deployed        ingress-nginx-4.2.5     1.3.1