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zk%)k6b)62%Hoi&d$C9^H6t$jYx8T?&GMm=c-fguEE5d|^1j1qy)_=~rXfs5$;)qhr z4%q`y%xe|K&`h}hwc2)1C1KY>jbGA}d3v3j zD5Elzy|UKsIlbBo5&w?EUA4AZe|W8RHeGpM;HS1j3(yC=)nq*=Guu>auZL0#69gYyEQZypCYfVUa5|h{OnnY`{Q<;P z*tTV*N!`g@L`H;CpuZn|DxmMMW@WZM7KeypkexxXj>Pdo>wYp=aGS>(jZE|>VNTBS z8J?3>q5$@3`?i(Dy!~XKzml^x2zS?LXSNVGVK=sJb++9y_HL>YG}>!OyElax;17-X zZqmlUT+)b*wzcfpi~&)GYc|jE!W;Xf2?C?UC5>EoxYcGPEQQffrC~tBz#PGVwo{lR z3$0C4!+AiDXpA_fjNQ!jVR2Kh1RC2VL%iEo;WhKet;|5f>ut$fQEq!2Lt2O y%{ztfKw*34Yam@XXxC< + Setup K3s +--- +## Introduction + +[K3s](https://k3s.io/?ref=traefik.io) is a lightweight Kubernetes distribution. Easy to install, half the memory, all in a binary of less than 100 MB. K3s is highly available and production-ready and very low resource requirements. +Great for: + +* Edge +* IoT +* CI +* Development +* ARM +* Embedding k8s +* Situations where a PhD in k8s clusterology is infeasible + +## Architecture + +### Servers and Agents + +* A server node is defined as a host running the k3s server command, with control-plane and datastore components managed by K3s. +* An agent node is defined as a host running the k3s agent command, without any datastore or control-plane components. +* Both servers and agents run the kubelet, container runtime, and CNI. + +![alt text](image.png) + +## Configuration Options + +K3s offers a variety of configuration options to tailor the setup to your needs. +Here are some key options: + +### Basic Configuration 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 system1. + +1. **Verify the Installation** : + +``` + k3s kubectl get nodes +``` + + This command checks if K3s is running and lists the nodes in your cluster. + +1. **Additional Utilities** : + +* The script also installs additional utilities like `kubectl`, `crictl`, `ctr`, `k3s-killall.sh`, and `k3s-uninstall.sh`1. + +1. **Configuration Options** : + +* You can use environment variables prefixed with `K3S_` or pass command flags to configure K3s2. +* For example, to set the server address: + **sh**Copy + + ``` + exportK3S_SERVER=https://your-server-address:6443 + curl -sfL https://get.k3s.io | sh - + ``` + +1. **Edit Configuration** : + +* After installation, you can edit the service configuration or environment file to change settings. +* A [kubeconfig](https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/) file will be written to `/etc/rancher/k3s/k3s.yaml` and the kubectl installed by K3s will automatically use it +* You can use a combination of `INSTALL_K3S_EXEC`, `K3S_` environment variables, and command flags to pass configuration to the service configuration. The prefixed environment variables, `INSTALL_K3S_EXEC` value, and trailing shell arguments are all persisted into the service configuration. After installation, configuration may be altered by editing the environment file, editing the service configuration, or simply re-running the installer with new options. + +``` +curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="server" sh -s - --flannel-backend none --token 12345 +curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="server --flannel-backend none" K3S_TOKEN=12345 sh -s - +curl -sfL https://get.k3s.io | K3S_TOKEN=12345 sh -s - server --flannel-backend none +#server is assumed below because there is no K3S_URL +curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="--flannel-backend none --token 12345" sh -s - +curl -sfL https://get.k3s.io | sh -s - --flannel-backend none --token 12345 +``` + +### Configuration 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 +``` + +### Configuration File + +In addition to configuring K3s with environment variables and CLI arguments, K3s can also use a config file. + +By default, values present in a YAML file located at /etc/rancher/k3s/config.yaml will be used on install. + +``` +write-kubeconfig-mode: "0644" +tls-san: + - "foo.local" +node-label: + - "foo=bar" + - "something=amazing" +cluster-init: true +``` + +This is equivalent to the following CLI arguments: + +``` +k3s server \ + --write-kubeconfig-mode "0644" \ + --tls-san "foo.local" \ + --node-label "foo=bar" \ + --node-label "something=amazing" \ + --cluster-init + +``` + +### Advanced Options / Configuration + +There are some advance ways to run and manage K3s. + +You can access them [here](https://docs.k3s.io/advanced) + + diff --git a/content/en/hosting/requirements.md b/content/en/hosting/requirements.md index 4a4585e77..c638de375 100644 --- a/content/en/hosting/requirements.md +++ b/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 %}} @@ -26,11 +25,9 @@ CHT 3.x is [End-of-Life]({{< relref "core/releases#supported-versions" >}}) and * TLS certificates - Docker Helper for [3.x]({{< relref "hosting/3.x/app-developer#cht-docker-helper" >}}) or [4.x]({{< relref "hosting/4.x/app-developer#cht-docker-helper-for-4x" >}}) provides these for you. * [Current version](https://docs.docker.com/engine/install/) of `docker` or current version of [Docker Desktop](https://www.docker.com/products/docker-desktop/) both of which include `docker compose`. Note that the older `docker-compose` has been [deprecated in favor of Compose V2](https://www.docker.com/blog/announcing-compose-v2-general-availability/). - - ## Kubernetes Production Hosting -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/). @@ -45,5 +42,39 @@ 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_ +## K3s + +K3s is lightweight, but requires some minimum requirements to run. +Whether you're installing K3s to run a native linux service or a container, each node should meet a minimum requirements. + +### **Architecture** + +* x86_64 +* armhf +* arm64/aarch64 +* s390x + +### **Operating Systems** + +* K3s is expected to work on most modern Linux systems + +### **Hardware requirements** + +| Spec | Minimum | Recommended | +| ---- | ------- | ----------- | +| CPU | 1 Core | 2 Cores | +| RAM | 512 MB | 1 GB | + +##### Disks + +K3s performance depends on the performance of the database. To ensure optimal speed, we recommend using an SSD when possible. +Disk performance will vary on ARM devices utilizing an SD card or eMMC + +### **Networking** + +The K3s server needs port 6443 to be accessible by all nodes. +The nodes need to be able to reach other nodes over UDP port 8472 when using the Flannel VXLAN backend, or over UDP port 51820 (and 51821 if IPv6 is used) when using the Flannel WireGuard backend. + ## 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). From d067959f2bb82c6ab9b3bfc05c385be56343425c Mon Sep 17 00:00:00 2001 From: Foromo Ernest Teoro Date: Fri, 18 Oct 2024 18:29:05 +0100 Subject: [PATCH 2/2] fix: feedback from review --- .../4.x/production/kubernetes/_index.md | 87 +++++++++- content/en/hosting/install-k3s.md | 159 ------------------ content/en/hosting/requirements.md | 33 ---- 3 files changed, 86 insertions(+), 193 deletions(-) delete mode 100755 content/en/hosting/install-k3s.md diff --git a/content/en/hosting/4.x/production/kubernetes/_index.md b/content/en/hosting/4.x/production/kubernetes/_index.md index 6bbd271dd..6286db4ce 100644 --- a/content/en/hosting/4.x/production/kubernetes/_index.md +++ b/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) diff --git a/content/en/hosting/install-k3s.md b/content/en/hosting/install-k3s.md deleted file mode 100755 index 8659b353b..000000000 --- a/content/en/hosting/install-k3s.md +++ /dev/null @@ -1,159 +0,0 @@ ---- -title: "Install K3s" -weight: 4 -description: > - Setup K3s ---- -## Introduction - -[K3s](https://k3s.io/?ref=traefik.io) is a lightweight Kubernetes distribution. Easy to install, half the memory, all in a binary of less than 100 MB. K3s is highly available and production-ready and very low resource requirements. -Great for: - -* Edge -* IoT -* CI -* Development -* ARM -* Embedding k8s -* Situations where a PhD in k8s clusterology is infeasible - -## Architecture - -### Servers and Agents - -* A server node is defined as a host running the k3s server command, with control-plane and datastore components managed by K3s. -* An agent node is defined as a host running the k3s agent command, without any datastore or control-plane components. -* Both servers and agents run the kubelet, container runtime, and CNI. - -![alt text](image.png) - -## Configuration Options - -K3s offers a variety of configuration options to tailor the setup to your needs. -Here are some key options: - -### Basic Configuration 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 system1. - -1. **Verify the Installation** : - -``` - k3s kubectl get nodes -``` - - This command checks if K3s is running and lists the nodes in your cluster. - -1. **Additional Utilities** : - -* The script also installs additional utilities like `kubectl`, `crictl`, `ctr`, `k3s-killall.sh`, and `k3s-uninstall.sh`1. - -1. **Configuration Options** : - -* You can use environment variables prefixed with `K3S_` or pass command flags to configure K3s2. -* For example, to set the server address: - **sh**Copy - - ``` - exportK3S_SERVER=https://your-server-address:6443 - curl -sfL https://get.k3s.io | sh - - ``` - -1. **Edit Configuration** : - -* After installation, you can edit the service configuration or environment file to change settings. -* A [kubeconfig](https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/) file will be written to `/etc/rancher/k3s/k3s.yaml` and the kubectl installed by K3s will automatically use it -* You can use a combination of `INSTALL_K3S_EXEC`, `K3S_` environment variables, and command flags to pass configuration to the service configuration. The prefixed environment variables, `INSTALL_K3S_EXEC` value, and trailing shell arguments are all persisted into the service configuration. After installation, configuration may be altered by editing the environment file, editing the service configuration, or simply re-running the installer with new options. - -``` -curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="server" sh -s - --flannel-backend none --token 12345 -curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="server --flannel-backend none" K3S_TOKEN=12345 sh -s - -curl -sfL https://get.k3s.io | K3S_TOKEN=12345 sh -s - server --flannel-backend none -#server is assumed below because there is no K3S_URL -curl -sfL https://get.k3s.io | INSTALL_K3S_EXEC="--flannel-backend none --token 12345" sh -s - -curl -sfL https://get.k3s.io | sh -s - --flannel-backend none --token 12345 -``` - -### Configuration 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 -``` - -### Configuration File - -In addition to configuring K3s with environment variables and CLI arguments, K3s can also use a config file. - -By default, values present in a YAML file located at /etc/rancher/k3s/config.yaml will be used on install. - -``` -write-kubeconfig-mode: "0644" -tls-san: - - "foo.local" -node-label: - - "foo=bar" - - "something=amazing" -cluster-init: true -``` - -This is equivalent to the following CLI arguments: - -``` -k3s server \ - --write-kubeconfig-mode "0644" \ - --tls-san "foo.local" \ - --node-label "foo=bar" \ - --node-label "something=amazing" \ - --cluster-init - -``` - -### Advanced Options / Configuration - -There are some advance ways to run and manage K3s. - -You can access them [here](https://docs.k3s.io/advanced) - - diff --git a/content/en/hosting/requirements.md b/content/en/hosting/requirements.md index d31d2ae49..388f22e6a 100644 --- a/content/en/hosting/requirements.md +++ b/content/en/hosting/requirements.md @@ -53,39 +53,6 @@ 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_ -## K3s - -K3s is lightweight, but requires some minimum requirements to run. -Whether you're installing K3s to run a native linux service or a container, each node should meet a minimum requirements. - -### **Architecture** - -* x86_64 -* armhf -* arm64/aarch64 -* s390x - -### **Operating Systems** - -* K3s is expected to work on most modern Linux systems - -### **Hardware requirements** - -| Spec | Minimum | Recommended | -| ---- | ------- | ----------- | -| CPU | 1 Core | 2 Cores | -| RAM | 512 MB | 1 GB | - -##### Disks - -K3s performance depends on the performance of the database. To ensure optimal speed, we recommend using an SSD when possible. -Disk performance will vary on ARM devices utilizing an SD card or eMMC - -### **Networking** - -The K3s server needs port 6443 to be accessible by all nodes. -The nodes need to be able to reach other nodes over UDP port 8472 when using the Flannel VXLAN backend, or over UDP port 51820 (and 51821 if IPv6 is used) when using the Flannel WireGuard backend. - ## 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).