DevOps Classroom Series – 19/Jul/2020 (Evening)

OpenShift

• OpenShift is an extension to Kubernetes (Kubernetes++)
• OpenShift leverages Kubernetes as a Container Mangement Platform and add several important capabilities, Some of them are
  • Self-Service Portal & Service Catalog
  • Build & application deployment
  • Built-in registry
  • Extended application routing
• Openshift Flavors
  • Openshift Origin/OKD:
    • Visit here
  • Openshift Container Platform:
    • Production Ready OpenShift Origin
    • Enterprise Support
    • Updates every 6 months
    • On your own private or on-site cloud
  • Openshift Online:
    • multi-tenant public cloud managed by RedHat
    • Here we have a free flavor
  • OpenShift Dedicated
    • Single-tenant container application hosted on AWS/Google Cloud/Azure.
• OpenShift Components:
  • Openshift Masters
  • Openshift nodes
  • Etcd as a key-value store.
  • Router as ingress traffic control
  • Openshift Internal Registry
• Openshift Architecture
• Authentication: Openshift has several built-in authentication methods that allow granular access to Openshift Projects
  • Local Authentication
  • LDAP authentication
  • Request Header authentication
  • Keystone authentication
  • GitHub authentication
• Internal Image Registry: Openshift uses an internal registry to store in Openshift that are ready to be deployed to Openshift nodes
• GUI and Web Console: easy to use web interface
• SCM Integration: built-in integration with git.
• Image builder: Convert from source-code into runnable-image
• CI/CD Integrations: easy to integrate with CI/CD tools like Jenkins

OpenShift Dev environment

• Wokring with oc cluster up:

  • System: Linux/mac/Windows with Docker installed

• Centos 7 Steps:

  1. Install Docker
  2. Configure an insecure registry
     • edit /etc/docker/daemon.json and ensure the following content is added

     {
     "insecure-registries": ["172.30.0.0/16"]
     }
     

  3. Allow ports on firewall or disable firewall-d
  4. Download the Openshift client utility
     • Download from here Refer Here
     • Or execute

     sudo yum -y install centos-release-openshift-origin39
     sudo yum -y install origin-clients
     

  5. Start the cluster: oc cluster up

minishift

• Refer Here for installation steps

Our Lab

• Lets create a free account of openshift online Refer Here

• Lets navigate to web console with Admin Login

• Workloads:

• Networking

• Storage

• Builds

• Developer View of Openshift

• Openshift can be operated from the oc command line Refer Here

Openshift Installation Onpremise

• Openshift can be installed with ansible playbooks Refer Here

Challenge-1

• Create a docker image for openmrs standalone Refer Here
• This openmrs to work requires mysql database.
• Create a k8s deployment for mysql with Persistent storage and Openmrs with 3 replicas.
• Create a github repository with the k8s yaml files
• You can use kubeadmin/AKS/EKS
• Deploy this application to k8s from jenkins pipeline

Challenge-2

• Try to create k8s deployment for nopcommerce application For Steps Refer Here
• Create a github repository with the k8s yaml files
• You can use kubeadmin/AKS/EKS
• Deploy this application to k8s from jenkins pipeline