Get shell access to nodes in Kubernetes via kubectl

Hits: 11

First, let’s learn the names of the nodes we have

devs@d8:~$ kubectl get nodes
NAME             STATUS   ROLES           AGE    VERSION
docker-desktop   Ready    control-plane   2d2h   v1.25.2

i only have one node at the moment 🙂

then i just need to give this commanf for shell login, i already have given ubuntu as image here, you can give any another image you want.

kubectl debug node/docker-desktop -it --image=Ubuntu

kubectl autocompletion on windows & git bash

Hits: 183

Write bash completion code to a file

kubectl completion bash > ~/.kube/completion.bash.inc

and source it from .bash_profile

printf "
# Kubectl shell completion
source '$HOME/.kube/completion.bash.inc'
" >> $HOME/.bash_profile

load the kubectl completion for bash in to current shell

source $HOME/.bash_profile

How to develop PHP applications on Local Kubernetes with Helm

Hits: 106

Dont Worry! It is Very Easy.. 🙂

Install the Helm CLI and k3s(/or minikube) as kubernetes before the begin.

  1. Create Project Tree with empty File Content like so:
.
├── Chart.yaml
├── project
│   └── index.php
├── templates
│   ├── deployment.yaml
│   ├── ingress.yaml
│   ├── pvc.yaml
│   ├── pv.yaml
│   └── service.yaml
└── values.yaml

now let’s fill in the files.

Read more

Chart.yaml

apiVersion: v2
name: myfirstlocalphpwithkubernetes
description: A Helm chart for local PHP Development on local Kubernetes

# A chart can be either an 'application' or a 'library' chart.
type: application

# This is the chart version. This version number should be incremented each time you make changes
# to the chart and its templates, including the app version.
version: 0.1.0
# This is the version number of the application being deployed. This version number should be
# incremented each time you make changes to the application. 
appVersion: "1.16.0"

project/index.php

<?php

echo "My First local PHP with Kubernetes via Helm";

templates/deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: {{ .Release.Name }}-deployment
  labels:
        app: {{ .Release.Name }}-php
spec:
  selector:
    matchLabels:
      app: {{ .Release.Name }}-php
  template:
    metadata:
      labels:
        app: {{ .Release.Name }}-php
    spec:
      containers:
      - image: {{ .Values.image.name }}:{{ .Values.image.tag }}
        name: {{ .Release.Name }}-php
        imagePullPolicy: Always
        ports:
          - containerPort: 80
        volumeMounts:
          - name: {{ .Release.Name }}-php-storage
            mountPath: {{ .Values.mountPath }}
      volumes:
        - name: {{ .Release.Name }}-php-storage
          persistentVolumeClaim:
            claimName: {{ .Release.Name }}-pvc-php

templates/ingress.yaml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: {{ .Release.Name }}-ingress
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - host: {{ .Values.hostname }}
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: {{ .Release.Name }}-php-service
            port:
              number: 80

template/pv.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name:  pv-{{ .Release.Name }}-php
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: {{ .Values.hostPath }}

template/pvc.yaml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
    name: {{ .Release.Name }}-pvc-php
spec:
    storageClassName: manual
    accessModes:
        - ReadWriteOnce
    resources:
        requests:
            storage: 1Gi

template/service.yaml

apiVersion: v1
kind: Service
metadata:
  name: {{ .Release.Name }}-php-service
spec:
  type: LoadBalancer
  selector:
    app: {{ .Release.Name }}-php
  ports:
      # By default and for convenience, the `targetPort` is set to the same value as the `port` field.
    - port: 80
      targetPort: 80
      # Optional field

values.yaml

hostname: 'simple-php.local'
mountPath: 'var/www/html/'
hostPath: '/home/projects/myfirstlocalphpwithkubernetes/project'
image:
  name: php
  tag: 8.1-apache

and let’s install with helm

d8dev@d8devs:~/projects/myfirstlocalphpwithkubernetes$ helm install -f values.yaml myfirstlocalphp .

Add hostname (simple-php.local) a.k.a domain in your /etc/hosts with any text editor.

My /etc/hosts looking so;

d8dev@d8devs:~/projects/myfirstlocalphpwithkubernetes$ cat /etc/hosts
127.0.0.1       localhost
127.0.1.1       simple-php.local
......
.....

And check the domain in your browser with slash ( http://simple-php.local/ )

Enjoy!

Cert-Manager – Kubernetes NGINX Ingress with Cert-Manager

Hits: 244

Install

Cert-manager is easy to install with Helm Package Manager. The first step is add Jetstack repository in our repository and becoming the package info with update

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

Now we can install Cert-Manager with CRDs into our cluster:

helm install cert-manager jetstack/cert-manager --namespace cert-manager --create-namespace --set installCRDs=true

Cert-manager have also a kubectl plugin to easily manage configs and resources

OS=$(go env GOOS); ARCH=$(go env GOARCH); curl -sSL -o kubectl-cert-manager.tar.gz https://github.com/cert-manager/cert-manager/releases/download/v1.7.2/kubectl-cert_manager-$OS-$ARCH.tar.gz
tar xzf kubectl-cert-manager.tar.gz
sudo mv kubectl-cert_manager /usr/local/bin

Configure for The Let’s Encrypt Certificate

Continue reading “Cert-Manager – Kubernetes NGINX Ingress with Cert-Manager”