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---
title: Setting up a High-availability RKE Kubernetes Cluster
shortTitle: Set up RKE Kubernetes
weight: 3
---
This section describes how to install a Kubernetes cluster. This cluster should be dedicated to run only the Rancher server.
> Rancher can run on any Kubernetes cluster, included hosted Kubernetes solutions such as Amazon EKS. The below instructions represent only one possible way to install Kubernetes.
For systems without direct internet access, refer to [Air Gap: Kubernetes install.]({{<baseurl>}}/rancher/v2.6/en/installation/other-installation-methods/air-gap/)
> **Single-node Installation Tip:**
> In a single-node Kubernetes cluster, the Rancher server does not have high availability, which is important for running Rancher in production. However, installing Rancher on a single-node cluster can be useful if you want to save resources by using a single node in the short term, while preserving a high-availability migration path.
>
> To set up a single-node RKE cluster, configure only one node in the `cluster.yml` . The single node should have all three roles: `etcd`, `controlplane`, and `worker`.
>
> In both single-node setups, Rancher can be installed with Helm on the Kubernetes cluster in the same way that it would be installed on any other cluster.
# Installing Kubernetes
### Required CLI Tools
Install [kubectl,](https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-kubectl) a Kubernetes command-line tool.
Also install [RKE,]({{<baseurl>}}/rke/latest/en/installation/) the Rancher Kubernetes Engine, a Kubernetes distribution and command-line tool.
### 1. Create the cluster configuration file
In this section, you will create a Kubernetes cluster configuration file called `rancher-cluster.yml`. In a later step, when you set up the cluster with an RKE command, it will use this file to install Kubernetes on your nodes.
Using the sample below as a guide, create the `rancher-cluster.yml` file. Replace the IP addresses in the `nodes` list with the IP address or DNS names of the 3 nodes you created.
If your node has public and internal addresses, it is recommended to set the `internal_address:` so Kubernetes will use it for intra-cluster communication. Some services like AWS EC2 require setting the `internal_address:` if you want to use self-referencing security groups or firewalls.
RKE will need to connect to each node over SSH, and it will look for a private key in the default location of `~/.ssh/id_rsa`. If your private key for a certain node is in a different location than the default, you will also need to configure the `ssh_key_path` option for that node.
```yaml
nodes:
- address: 165.227.114.63
internal_address: 172.16.22.12
user: ubuntu
role: [controlplane, worker, etcd]
- address: 165.227.116.167
internal_address: 172.16.32.37
user: ubuntu
role: [controlplane, worker, etcd]
- address: 165.227.127.226
internal_address: 172.16.42.73
user: ubuntu
role: [controlplane, worker, etcd]
services:
etcd:
snapshot: true
creation: 6h
retention: 24h
# Required for external TLS termination with
# ingress-nginx v0.22+
ingress:
provider: nginx
options:
use-forwarded-headers: "true"
```
<figcaption>Common RKE Nodes Options</figcaption>
| Option | Required | Description |
| ------------------ | -------- | -------------------------------------------------------------------------------------- |
| `address` | yes | The public DNS or IP address |
| `user` | yes | A user that can run docker commands |
| `role` | yes | List of Kubernetes roles assigned to the node |
| `internal_address` | no | The private DNS or IP address for internal cluster traffic |
| `ssh_key_path` | no | Path to SSH private key used to authenticate to the node (defaults to `~/.ssh/id_rsa`) |
> **Advanced Configurations:** RKE has many configuration options for customizing the install to suit your specific environment.
>
> Please see the [RKE Documentation]({{<baseurl>}}/rke/latest/en/config-options/) for the full list of options and capabilities.
>
> For tuning your etcd cluster for larger Rancher installations, see the [etcd settings guide]({{<baseurl>}}/rancher/v2.6/en/installation/resources/advanced/etcd/).
>
> For more information regarding Dockershim support, refer to [this page]({{<baseurl>}}/rancher/v2.6/en/installation/requirements/dockershim/)
### 2. Run RKE
```
rke up --config ./rancher-cluster.yml
```
When finished, it should end with the line: `Finished building Kubernetes cluster successfully`.
### 3. Test Your Cluster
This section describes how to set up your workspace so that you can interact with this cluster using the `kubectl` command-line tool.
Assuming you have installed `kubectl`, you need to place the `kubeconfig` file in a location where `kubectl` can reach it. The `kubeconfig` file contains the credentials necessary to access your cluster with `kubectl`.
When you ran `rke up`, RKE should have created a `kubeconfig` file named `kube_config_cluster.yml`. This file has the credentials for `kubectl` and `helm`.
> **Note:** If you have used a different file name from `rancher-cluster.yml`, then the kube config file will be named `kube_config_<FILE_NAME>.yml`.
Move this file to `$HOME/.kube/config`, or if you are working with multiple Kubernetes clusters, set the `KUBECONFIG` environmental variable to the path of `kube_config_cluster.yml`:
```
export KUBECONFIG=$(pwd)/kube_config_cluster.yml
```
Test your connectivity with `kubectl` and see if all your nodes are in `Ready` state:
```
kubectl get nodes
NAME STATUS ROLES AGE VERSION
165.227.114.63 Ready controlplane,etcd,worker 11m v1.13.5
165.227.116.167 Ready controlplane,etcd,worker 11m v1.13.5
165.227.127.226 Ready controlplane,etcd,worker 11m v1.13.5
```
### 4. Check the Health of Your Cluster Pods
Check that all the required pods and containers are healthy are ready to continue.
- Pods are in `Running` or `Completed` state.
- `READY` column shows all the containers are running (i.e. `3/3`) for pods with `STATUS` `Running`
- Pods with `STATUS` `Completed` are run-once Jobs. For these pods `READY` should be `0/1`.
```
kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
ingress-nginx nginx-ingress-controller-tnsn4 1/1 Running 0 30s
ingress-nginx nginx-ingress-controller-tw2ht 1/1 Running 0 30s
ingress-nginx nginx-ingress-controller-v874b 1/1 Running 0 30s
kube-system canal-jp4hz 3/3 Running 0 30s
kube-system canal-z2hg8 3/3 Running 0 30s
kube-system canal-z6kpw 3/3 Running 0 30s
kube-system kube-dns-7588d5b5f5-sf4vh 3/3 Running 0 30s
kube-system kube-dns-autoscaler-5db9bbb766-jz2k6 1/1 Running 0 30s
kube-system metrics-server-97bc649d5-4rl2q 1/1 Running 0 30s
kube-system rke-ingress-controller-deploy-job-bhzgm 0/1 Completed 0 30s
kube-system rke-kubedns-addon-deploy-job-gl7t4 0/1 Completed 0 30s
kube-system rke-metrics-addon-deploy-job-7ljkc 0/1 Completed 0 30s
kube-system rke-network-plugin-deploy-job-6pbgj 0/1 Completed 0 30s
```
This confirms that you have successfully installed a Kubernetes cluster that the Rancher server will run on.
### 5. Save Your Files
> **Important**
> The files mentioned below are needed to maintain, troubleshoot and upgrade your cluster.
Save a copy of the following files in a secure location:
- `rancher-cluster.yml`: The RKE cluster configuration file.
- `kube_config_cluster.yml`: The [Kubeconfig file]({{<baseurl>}}/rke/latest/en/kubeconfig/) for the cluster, this file contains credentials for full access to the cluster.
- `rancher-cluster.rkestate`: The [Kubernetes Cluster State file]({{<baseurl>}}/rke/latest/en/installation/#kubernetes-cluster-state), this file contains credentials for full access to the cluster.<br/><br/>_The Kubernetes Cluster State file is only created when using RKE v0.2.0 or higher._
> **Note:** The "rancher-cluster" parts of the two latter file names are dependent on how you name the RKE cluster configuration file.
### Issues or errors?
See the [Troubleshooting]({{<baseurl>}}/rancher/v2.6/en/installation/resources/troubleshooting/) page.
### [Next: Install Rancher]({{<baseurl>}}/rancher/v2.6/en/installation/install-rancher-on-k8s/)