DubOPS Event

DubOps is a unique event that brings together DevOps, IT operations, and software development experts to share their knowledge and insights with the community. This event provides a platform for attendees to learn about the latest trends and best practices in the industry, as well as network with peers and thought leaders.

Registration for the Dubops event is now open, and we encourage anyone interested in attending to sign up early, as space is limited. Don’t miss this chance to expand your knowledge, connect with peers, and stay ahead of the curve in the ever-changing world of DevOps and IT operations.

Date: May 11th, 2023
Time: 18:00 – 21:00
Location: Zabeel House, Dubai, UAE
Registration link: https://lnkd.in/dCd7V-vv
We look forward to seeing you there!

Regards

Osama

Multi POd Example – k8s

Create a Multi-Container Pod

  1. Create a YAML file named multi.yml:
apiVersion: v1
kind: Pod
metadata:
  name: multi
  namespace: baz
spec:
  containers:
  - name: nginx
    image: nginx
  - name: redis
    image: redis

Create a Complex Multi-Container Pod

apiVersion: v1
kind: Pod
metadata:
  name: logging-sidecar
  namespace: baz
spec:
  containers:
  - name: busybox1
    image: busybox
    command: ['sh', '-c', 'while true; do echo Logging data > /output/output.log; sleep 5; done']
    volumeMounts:
    - name: sharedvol
      mountPath: /output
  - name: sidecar
    image: busybox
    command: ['sh', '-c', 'tail -f /input/output.log']
    volumeMounts:
    - name: sharedvol
      mountPath: /input
  volumes:
  - name: sharedvol
    emptyDir: {}

FREE LEARNING ON UDEMY

The below is now Free courses on Udemy, not sure till when so enjoy as you can.

Free learning on Udemy DevOps Tutorials for Absolute Beginner

  1. DevOps – The Introduction
    https://lnkd.in/dD79ZpJF
  2. CI CD pipeline – Devops Automation in 1 hr
    https://lnkd.in/dMQEGJBN
  3. DevOps Crash Course
    https://lnkd.in/dt5CmYSN
  4. DevOps 101
    https://lnkd.in/dhyzHVQh
  5. DevOps on AWS: Code, Build, and Test (Course 1 of 3)
    https://lnkd.in/dV6NbWRJ
  6. Free Devops Interview Questions and Answers
    https://lnkd.in/dsQu76qm
  7. DevOps Tools for Beginners: Ansible in 1 hour
    https://lnkd.in/dKgMap-r
  8. DevOps on AWS: Release and Deploy (Course 2 of 3)
    https://lnkd.in/dzQuM4Ht
  9. DevOps on AWS: Operate and Monitor (Course 3 of 3)
    https://lnkd.in/d_P9wUgg
  10. Introduction to DevOps, Habits and Practices
    https://lnkd.in/dsvQQcYj
  11. Amazon AWS Cloud IAM Hands-On
    https://lnkd.in/ddSBhiST
  12. DevOps : CI/CD with Jenkins
    https://lnkd.in/d3qvi-Az
  13. Introduction to YAML – A hands -on course
    https://lnkd.in/d4ypNfGF
  14. Kubernetes: Getting Started
    https://lnkd.in/d_JQi6wF
  15. Docker Tutorial for Beginners practical hands on -Devops
    https://lnkd.in/dbSJ-zfX
  16. Ansible for the Absolute Beginner – DevOps
    https://lnkd.in/dn_w3bsK
  17. Docker, Docker SWARM and Kubernetes crash course for DevOps
    https://lnkd.in/dFirktd3
  18. Understanding Docker in about an Hour
    https://lnkd.in/dNBvbgqJ
  19. Learn terraform by setting up Highly available wordpress
    https://lnkd.in/d-AaXDT2
  20. Use Ansible with Amazon Web Services
    https://lnkd.in/d6VfZi7d
  21. GIT Crash Course
    https://lnkd.in/ddzznGuV
  22. Maven Quick Start: A Fast Introduction to Maven by Example
    https://lnkd.in/dhVam3zC
  23. Master Amazon EC2 Basics with 10 Labs
    https://lnkd.in/d9jQ6cmN
  24. Amazon Web Services (AWS): CloudFormation
    https://lnkd.in/dAc65c-H
  25. Just enough Ansible to be dangerous
    https://lnkd.in/dXaWmX5d
  26. AZ-900 Microsoft Azure Fundamentals
    https://lnkd.in/dcdae_VZ
  27. Deploy Azure Virtual Desktop for beginners
    https://lnkd.in/dQsbzHes
  28. Apache Maven for Beginners
    https://lnkd.in/dWTK6dxn
  29. AWS Certified Solutions Architect Associate Introduction
    https://lnkd.in/d4eR5gsW
  30. Microsoft Azure fundamentals Az900 crash course
    https://lnkd.in/de5GBCEB
  31. Azure Real World Hand-on Training For Beginners.
    https://lnkd.in/dB3VM7f7
  32. Introduction to Linux Shell Scripting
    https://lnkd.in/dCb4BkvH
  33. Create a 3-Tier Application Using Azure Virtual Machines
    https://lnkd.in/dfMtuW8C
  34. AWS VPC and VPC Peering Demo
    https://lnkd.in/dxnraPHf
  35. Amazon Web Services (AWS) EC2: An Introduction
    https://lnkd.in/drUvNuFk
  36. Hosting your static website on Amazon AWS S3 service
    https://lnkd.in/dBw4RKs2
  37. Mobaxterm Powerful tools to access Linux and Unix
    https://lnkd.in/dzKTB4xw
  38. Getting started with Cloud Computing using Microsoft Azure
    https://lnkd.in/dViDqS2t
  39. Cloud Computing Fundamental
    https://lnkd.in/d9ZY_Kdq

Cheers
Osama

K8s Example

Create a Service Account

It’s super simple command

kubectl create sa webautomation -n web

Create a ClusterRole That Provides Read Access to Pods

  1. Define the ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: pod-reader
rules:
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["get", "watch", "list"]

Bind the ClusterRole to the Service Account to Only Read Pods in the web Namespace

apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: rb-pod-reader
  namespace: web
subjects:
- kind: ServiceAccount
  name: webautomation
roleRef:
  kind: ClusterRole
  name: pod-reader
  apiGroup: rbac.authorization.k8s.io

Cheers

Osama

Managing Container Storage with Kubernetes Volumes

Kubernetes volumes offer a simple way to mount external storage to containers. This lab will test your knowledge of volumes as you provide storage to some containers according to a provided specification. This will allow you to practice what you know about using Kubernetes volumes.

Create a Pod That Outputs Data to the Host Using a Volume

  • Create a Pod that will interact with the host file system by using vi maintenance-pod.yml.
apiVersion: v1
kind: Pod
metadata:
    name: maintenance-pod
spec:
    containers:
    - name: busybox
      image: busybox
      command: ['sh', '-c', 'while true; do echo Success! >> /output/output.txt; sleep 5; done']
  • Under the basic YAML, begin creating volumes, which should be level with the containers spec:
volumes:
- name: output-vol
  hostPath:
      path: /var/data
  • In the containers spec of the basic YAML, add a line for volume mounts:
volumeMounts:
- name: output-vol
  mountPath: /output

The complete YAML will be

apiVersion: v1
kind: Pod
metadata:
    name: maintenance-pod
spec:
  containers:
    - name: busybox
      image: busybox
      command: ['sh', '-c', 'while true; do echo Success! >> /output/output.txt; sleep 5; done']
      volumeMounts:
      - name: output-vol
        mountPath: /output
  volumes:
   - name: output-vol
     hostPath:
      path: /var/data

Create a Multi-Container Pod That Shares Data Between Containers Using a Volume

  1. Create another YAML file for a shared-data multi-container Pod by using vi shared-data-pod.yml
  2. Start with the basic Pod definition and add multiple containers, where the first container will write the output.txt file and the second container will read the output.txt file:
apiVersion: v1
kind: Pod
metadata:
    name: shared-data-pod
spec:
    containers:
    - name: busybox1
      image: busybox
      command: ['sh', '-c', 'while true; do echo Success! >> /output/output.txt; sleep 5; done']
    - name: busybox2
      image: busybox
      command: ['sh', '-c', 'while true; do cat /input/output.txt; sleep 5; done']

Set up the volumes, again at the same level as containers with an emptyDir volume that only exists to share data between two containers in a simple way:

volumes:
- name: shared-vol
  emptyDir: {}

Mount that volume between the two containers by adding the following lines under command for the busybox1 container:

volumeMounts:
- name: shared-vol
  mountPath: /output

For the busybox2 container, add the following lines to mount the same volume under command to complete creating the shared file:

volumeMounts:
- name: shared-vol
  mountPath: /input

The complete file

Finish creating the multi-container Pod using kubectl create -f shared-data-pod.yml.

apiVersion: v1
kind: Pod
metadata:
    name: shared-data-pod
spec:
    containers:
    - name: busybox1
      image: busybox
      command: ['sh', '-c', 'while true; do echo Success! >> /output/output.txt; sleep 5; done']
      volumeMounts:
        - name: shared-vol
          mountPath: /output
    - name: busybox2
      image: busybox
      command: ['sh', '-c', 'while true; do cat /input/output.txt; sleep 5; done']
      volumeMounts:
        - name: shared-vol
          mountPath: /input
    volumes:
    - name: shared-vol
    emptyDir: {}

And you can now apply the YAML file.

Cheers

Osama

role vs rolebinding in kubernetes

You need to know the difference between

  • Role.
  • Rolebinding.
  • ClusterRole.

Please refer the Kubernetes documentation here

A Role always sets permissions within a particular namespace; when you create a Role, you have to specify the namespace it belongs in.

ClusterRole, by contrast, is a non-namespaced resource. The resources have different names (Role and ClusterRole) because a Kubernetes object always has to be either namespaced or not namespaced; it can’t be both.

A rolebinding is namespace scoped and clusterrolebinding is cluster scoped i.e across all namespace.

ClusterRoles and ClusterRoleBindings are useful in the following cases:

  1. Give permissions for non-namespaced resources like nodes
  2. Give permissions for resources in all the namespaces of a cluster
  3. Give permissions for non-resource endpoints like /healthz

A RoleBinding can also reference a ClusterRole to grant the permissions defined in that ClusterRole to resources inside the RoleBinding’s namespace. This kind of reference lets you define a set of common roles across your cluster, then reuse them within multiple namespaces.

example

Create a Role for the dev User

  1. Create a role spec file role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  namespace: beebox-mobile
  name: pod-reader
rules:
- apiGroups: [""]
  resources: ["pods", "pods/log"]
  verbs: ["get", "watch", "list"]

2. Save and exit the file by pressing Escape followed by :wq.

3. apply the role.

kubectl apply -f file-name.yml

Bind the Role to the dev User and Verify Your Setup Works

  1. Create the RoleBinding spec file:
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: pod-reader
  namespace: beebox-mobile
subjects:
- kind: User
  name: dev
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: Role
  name: pod-reader
  apiGroup: rbac.authorization.k8s.io

2. Apply the role, by running

kubectl apply -f file-name.yml

Cheers

Osama

 APAC Groundbreakers Virtual Tour 2021

I will have two presentation about the DevOps

  • Database Automation, Is this even possible ?
  • Kuberenetes in Depth but in simple way

You can register here

The hashtag in use is #APACGBT2021

Enjoy

Cheers

Oracle Database 19c SIG November Meeting

About Quest’s product communities

Quest Oracle Community, HD Png Download , Transparent Png Image - PNGitem

Quest Oracle Community is home to 25,000+ users of JD Edwards, PeopleSoft, Oracle Cloud apps and Oracle Database products. We connect Oracle users to technology leaders and Oracle experts from companies who are driving innovation and leading through their use of Oracle products.

The Quest Oracle Community is dedicated to helping Oracle users develop skills and expand knowledge by connecting with other Oracle users and experts for education and networking.

I will present about the automation

You can register for the event from here

Thank you