Rancher

The following section teaches you how to setup Rancher.

Introduction

We will use kubernetes to orchestrate the docker containers. To manage kuernete clusters, there are free tools like Rancher, KubeSphere, and we choose Rancher.

How to Install Docker

Setup Docker

Install Rancher

Setup VM such as GCE

Setup GCE

Install and Set Up kubectl

Install and Set Up kubectl

Install RKE

https://rancher.com/docs/rke/latest/en/installation/

BackupConfig

Sample cluster.yml

nodes:
    - address: 10.128.0.2
      user: colinzuo
      role: [controlplane, worker, etcd]

services:
  etcd:
    backup_config:
      enabled: true     # enables recurring etcd snapshots
      interval_hours: 6 # time increment between snapshots
      retention: 7     # time in days before snapshot purge

# Required for external TLS termination with
# ingress-nginx v0.22+
ingress:
  provider: nginx
  options:
    use-forwarded-headers: "true"

rke up

Config kubectl config

mkdir -p ~/.kube
cp kube_config_cluster.yml ~/.kube/rancher_config
# edit ~/.profile
export KUBECONFIG=$HOME/.kube/rancher_config

Install Helm

Install Helm

Install Rancher Itself

helm repo add rancher-stable https://releases.rancher.com/server-charts/stable

kubectl apply -f https://raw.githubusercontent.com/jetstack/cert-manager/release-0.12/deploy/manifests/00-crds.yaml

kubectl create namespace cert-manager

helm repo add jetstack https://charts.jetstack.io

helm repo update

helm install \
  cert-manager jetstack/cert-manager \
  --namespace cert-manager \
  --version v0.12.0

kubectl get pods --namespace cert-manager

helm install rancher rancher-stable/rancher \
  --namespace cattle-system \
  --set hostname=ranchercz1.myorg.com

kubectl -n cattle-system rollout status deploy/rancher

Modify hosts file to add hostname entry for Web Client

such as for windows

10.128.0.2 ranchercz1.myorg.com

Create RKE template

as needed

Create Cluster

take GKE for ex

• Enable Identity and Access Management (IAM) API https://console.developers.google.com/apis/api/iam.googleapis.com/overview?project=PROJECT_ID
• Enable Kubernetes Engine API https://console.developers.google.com/apis/api/container.googleapis.com/overview?project=731260793637
• Create a Service Account with roles
  • Compute Viewer
  • Project Viewer
  • Kubernetes Engine Admin
  • Service Account User

Modify cattle-cluster-agent to add host-aliases

https://kubernetes.io/docs/concepts/services-networking/add-entries-to-pod-etc-hosts-with-host-aliases/

      - hostnames:
        - ranchercz1.myorg.com
        ip: 10.128.0.2

Modify hosts file to add hostname entry for k8s Nodes

/etc/hosts

10.128.0.2 ranchercz1.myorg.com

Resource Reservation

kubectl describe nodes

kubectl get po --all-namespaces -o=jsonpath="{range .items[*]}{.metadata.namespace}:{.metadata.name}{'\n'}{range .spec.containers[*]}  {.name}:{.resources.requests.cpu}{'\n'}{end}{'\n'}{end}"