Add a requirement and installation doc for K3s

content/en/hosting/4.x/production/kubernetes/_index.md

@@ -8,6 +8,91 @@ relatedContent: >
     hosting/requirements
     hosting/kubernetes-vs-docker
 ---
+Kubernetes is more complex set up of CHT hosting over [Docker]({{< relref "hosting/4.x/production/docker" >}}) .  It enables maximum scalability for multi-node CouchDB and multi-tenant deployments.
 
-Kubernetes is more complex set up of CHT hosting over [Docker]({{< relref "hosting/4.x/production/docker" >}}) .  It enables maximum scalability for multi-node CouchDB and multi-tenant deployments. 
+## Introduction
 
+[K3s](https://k3s.io) is a lightweight Kubernetes distribution and has no external dependencies.
+
+However you plan on pushing CHT Core to k3s cluster just make sure all the requirements as per CHT [requirements](https://docs.communityhealthtoolkit.org/hosting/requirements).
+
+## K3s minimal component:
+
+* A fully functional Kubernetes cluster
+* Sqlite as storage backend instead of etcd
+* Containerd as default container runtime (not Docker)
+* Flannel as container network plugin by default
+* Traefik as Ingress controller
+* Local storage provisioner as default StorageClass for persistent volumes
+
+## Installation Options
+
+#### **Installation Script**
+
+Use the installation script to set up K3s as a service and by using the installation script we install K3s as systemd and openrc based systems.
+
+To install K3s using the installation script, follow these steps:
+
+1. **Download the Installation Script** :
+
+```
+
+   curl -sfL https://get.k3s.io | sh -
+
+```
+
+   This command downloads the script and runs it, installing K3s as a service on your system.
+
+2. **Configuration Options** :
+
+* You can use environment variables prefixed with `K3S_` or pass command flags to configure K3s2.
+* For example, to set the server address:
+
+```
+
+  exportK3S_SERVER=https://your-server-address:6443
+
+  curl -sfL https://get.k3s.io | sh -
+```
+
+
+3. **Verify the Installation** :
+   The below command checks if K3s is running and lists the nodes in your cluster.
+
+```
+
+   k3s kubectl get nodes
+
+```
+
+#### Installing with binary
+
+The installation script is primarily concerned with configuring K3s to run as a service.
+
+If you choose to not use the script, you can run K3s simply by downloading the binary from our release page, placing it on your path, and executing it.
+
+```
+
+curl -Lo /usr/local/bin/k3s https://github.com/k3s-io/k3s/releases/download/v1.26.5+k3s1/k3s; chmod a+x /usr/local/bin/k3s
+
+```
+
+You can pass configuration by setting K3S_ environment variables:
+
+```
+
+k3s server --write-kubeconfig-mode=644
+
+```
+
+Or command flags:
+
+```
+
+k3s server --write-kubeconfig-mode=644
+
+```
+
+### Advanced Options / Configuration
+
+For more details look [here](https://docs.k3s.io/installation)

content/en/hosting/requirements.md

@@ -10,7 +10,6 @@ relatedContent: >
   hosting/3.x/self-hosting
   hosting/3.x/ec2-setup-guide
 ---
-
 {{% pageinfo %}}
 For production CHT deployments, Linux is recommended, with [Ubuntu](https://ubuntu.com/server) the most commonly used. For App Developer Hosting, Linux or macOS may be used. Windows can be used for either, but without recommendation.
 {{% /pageinfo %}}
@@ -39,7 +38,7 @@ This leverages Docker and requires:
 
 ### Kubernetes
 
-This guide refers to "Kubernetes", but Medic recommends a lightweight orchestrator called [K3s](https://docs.k3s.io/) for bare-metal hosts.  The requirements below refer to K3s deployments but can be translated to other Kubernetes hosting.  For example, for cloud hosting, we recommend Amazon [Elastic Kubernetes Service](https://aws.amazon.com/eks/) (EKS) and we've also assisted in a [large K3s deployment based on VMWare]({{< relref "4.x/production/kubernetes/self-hosting-k3s-multinode" >}}). 
+This guide refers to "Kubernetes", but Medic recommends a lightweight orchestrator called [K3s](https://docs.k3s.io/) for bare-metal hosts.  The requirements below refer to K3s deployments but can be translated to other Kubernetes hosting.  For example, for cloud hosting, we recommend Amazon [Elastic Kubernetes Service](https://aws.amazon.com/eks/) (EKS) and we've also assisted in a [large K3s deployment based on VMWare]({{< relref "4.x/production/kubernetes/self-hosting-k3s-multinode" >}}).
 
 Be sure to see the `cht-deploy` [script](https://github.com/medic/cht-core/tree/master/scripts/deploy) that leverage the `helm` [application](https://helm.sh/docs/intro/install/).
 
@@ -55,4 +54,5 @@ Be sure to see the `cht-deploy` [script](https://github.com/medic/cht-core/tree/
 _\* During some upgrades, up to 3x current space used by CouchDB can be needed_
 
 ## Required skills
+
 In addition to the hosting requirements, system administrators should have a basic understanding of command line interface, Kubernetes, docker, container orchestration, deployment, databases (CouchDB, Postgres), networking components (TLS, IP addresses, DNS).