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kubernetes fundamentals in docker kind

Annoyed Anteater answered on January 4, 2023 Popularity 1/10 Helpfulness 1/10

answer kubernetes fundamentals in docker kind

kubernetes fundamentals in docker kind

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{ clear && \
  echo -e "\n=== Kubernetes Status ===\n" && \
  kubectl get --raw '/healthz?verbose' && \
  kubectl version --short && \
  kubectl get nodes && \
  kubectl cluster-info; 
} | grep -z 'Ready\| ok\|passed\|running'
==========================================================
  Inspect the control plane
  
 $ kubectl get pods,services --all-namespaces
==========================================================
   Create a multinode cluster with exposed ports
 $ less example-kind-cluster.yaml | tee
==========================================================
   Create cluster with configuration
 $ kind create cluster --config example-kind-cluster.yaml
 $ kind get clusters //get cluster info
 $ docker container ls --all --size --filter name=^kind | grep -z "kindest"
 $ kubectl get nodes -o wide  //getting nodes list
 ==========================================================
   Inspect the control plane
 $ kubectl get pods,services --all-namespaces
===========================================================
   Create a deployment
 $ kubectl create deployment my-nginx --image=nginx //nginx image with deployment
===========================================================
   Expose the deployment with a service
 $ kubectl expose deployment my-nginx --type=NodePort --port=80
----------------------------------------------------------
   Confirm that the application objects have been created and are running:
 $ kubectl get pods,services
============================================================
   The service my-nginx is exposed as NodePort:
 $ PORT=$(kubectl get service my-nginx  -o jsonpath="{.spec.ports[0].nodePort}") && echo $PORT
 
 However, if we try to expose nginx server at that port we do not get a response
 $ curl http://$(uname -n):$PORT

we added the mapping to kind 32001 so we'll expose the service name public-nginx
on port 32001 NodePort;
 $ kubectl apply -f public-nginx.yaml
 $ kubectl get pods,services | grep -z 32001
--------------------------------------------------------------
Now curl command to that port:
 $ curl http://$(uname -n):32001 | grep -C1 "successfully"
===================================================================
  Kubernetes dashboard:
Now that the kubernetes is kind, you can install other helpful application
such as kubernetes dashboard, A common way to install kubernetes dashboard
is through Helm chart.
 $ helm version --short
-------------------------------------------------------------------
   Add the chart to helm:
 $ helm repo add kubernetes-dashboard https://kubernetes.github.io/dashboard/ && helm repo list

Add an admin user service account to grant the dashboard roles to access the cluster
resources and objects:
 $ kubectl create namespace kubernetes-dashboard && kubectl apply -f dash-auth.yaml
-------------------------------------------------------------------
Install kubernetes dashboard using Public Helm chart:
 $ helm install kubernetes-dashboard kubernetes-dashboard/kubernetes-dashboard \
   --version=5.4.1 \
   --namespace kubernetes-dashboard \
   --create-namespace \
   --values dash-values.yaml
--------------------------------------------------------------------
Once the dashboard pods reports Running we can access it using:
 $ kubectl get services,pods -n kubernetes-dashboard -l app.kubernetes.io/name=kubernetes-dashboard

we can administer our cluster using kubectl or using kubernetes dashboard:
 $ kubectl get services,pods -n kubernetes-dashboard -l app.kubernetes.io/name=kubernetes-dashboard

it will prompt us to provide access token at ay time we can run the following script:
 $ k8s-dash-token.sh
and done....

Popularity 1/10 Helpfulness 1/10 Language whatever

Source: learning.oreilly.com

Tags: docker kind kubernetes whatever

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Contributed on Jan 04 2023

Annoyed Anteater

0 Answers Avg Quality 2/10

kubernetes fundamentals in docker kind

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