ShubhamTatvamasi / rancher

rancher

RKE

Setup Node

# Disable swap:
sudo swapoff -a

# Install docker for rancher:
curl https://releases.rancher.com/install-docker/24.0.sh | sh

sudo usermod -aG docker $USER

Increase pod limit:

services:
  kubelet:
    extra_args:
      max-pods: 250

https://rancher.com/docs/rancher/v2.6/en/installation/requirements/installing-docker/
https://github.com/rancher/rke/releases

Download rke for Ubuntu:

sudo wget https://github.com/rancher/rke/releases/download/v1.3.0/rke_linux-amd64 \
  -O /usr/local/bin/rke

sudo chmod +x /usr/local/bin/rke

Generate config for RKE cluster:

rke config -a

Setup cluster:

rke up

Update cluster.yml for adding or removing nodes, then run:

rke up --update-only

Rotate RKE cluster certificates:

rke cert rotate

Merge rancher config file:

# Make a copy of your existing config
cp ~/.kube/config ~/.kube/config.bak

# Merge the two config files together into a new config file
KUBECONFIG=~/.kube/config:${PWD}/kube_config_cluster.yml kubectl config view --flatten > /tmp/config

# Replace your old config with the new merged config
mv /tmp/config ~/.kube/config

# (optional) Delete the backup once you confirm everything worked ok
rm ~/.kube/config.bak

# rename context of rancher cluster
kubectx rancher-cluster=local

RKE Upgrade – Change

• Take an etcd snapshot

  rke etcd snapshot-save --config cluster.yml --name pre-k8s-upgrade-`date '+%Y%m%d%H%M%S'`
  

• Change kubernetes_version in the cluster.yml

  kubernetes_version: "1.19.7-rancher1-1"
  

https://github.com/mattmattox/Kubernetes-Master-Class-Upgrades