Setup RKE (Rancher Kubernetes Engine) cluster

If RKE environment is not prepared yet, please follow this installation guid. Before setup the RKE cluster, please check ip address on all nodes.

Setup RKE Cluster on Rancher Node

1. create a cluster config file, name as rancher-cluster.yaml.

vi rancher-cluster.yaml

rancher-cluster.yaml

nodes:
  - address: 192.168.123.9
    user: dockeruser
    role: [controlplane, etcd, worker]
  - address: 192.168.123.10
    user: dockeruser
    role: [controlplane, etcd, worker]
  - address: 192.168.123.11
    user: dockeruser
    role: [controlplane, etcd, worker]

services:
  etcd:
    snapshot: true
    backup: false
    creation: 6h
    retention: 24h

2. Run rke up commend to start the cluster. It will to take too long to base on internet connection and hardware resources.

$ rke up --config rancher-cluster.yaml

If the message Finished building Kubernetes cluster successfully is got, the kubernetes cluster is successfully setup.

3. Set the KUBECONFIG environmental variable to the path of kube_config_rancher-cluster.yaml which created by RKE installation.

export KUBECONFIG=$(pwd)/kube_config_rancher-cluster.yaml

4. Check all of nodes status on the RKE cluster

$ kubectl get nodes

5. Check all of pods status on the RKE cluster.

$ kubectl get pods --all-namespaces

Most are Running and Completed.

Installation Rancher UI

The Rancher UI is used to manage from a Web interface.

1. Install Rancher UI on Rancher-VM

docker run -d --restart=unless-stopped -p 80:80 -p 443:443 rancher/rancher:stable

2.If Rancher UI is sucessfully installed, go http://<IP-ADDRESS> and login.

Import RKE Cluster to Rancher UI Dashboard

1. Click Add Cluster.
2. Select Import and give the cluster name. Eg. name like rke-cluster
3. Click Create. it will show the following screen.

4. Click 3rd Copy to Clipboard
5. Modify the copy string as below. Make sure to add --kubeconfig kube_config_rancher-cluster.yaml.

curl --insecure -sfL https://192.168.123.8/v3/import/h97g6whx7nbkpbqkc98xkvp4dzwmn49nn9bmdzhcnpgshqm45h2d9p.yaml | kubectl --kubeconfig kube_config_rancher-cluster.yml apply -f -

6. Run No.5 command on Rancher VM.

7. Click Done on Rancher UI.

Import porcess take a few minutes.

When rke-cluster is active. click the link to check the status.

For more information Rancher High Availability (HA) Install.

Issue

Failed to start [rke-etcd-port-listener] container on host [192.168.123.11]: Error response from daemon: driver failed programming external connectivity on endpoint rke-etcd-port-listener (c35e1742f00f349baac3d57b968f2bf30c6b2eb82a586d4641e29f447f295d2c): (iptables failed: iptables --wait -t nat -A DOCKER -p tcp -d 0/0 --dport 2380 -j DNAT --to-destination 172.17.0.2:1337 ! -i docker0: iptables: No chain/target/match by that name. (exit status 1))

• Delete all docker image and container on all nodes.

$ docker system prune && docker rm $(docker ps -a -q) -f && docker rmi $(docker images -q) -f

• Restart docker on all nodes

$ systemctl restart docker

• Install rke agian

$ rke up --config rancher-cluster.yaml