Openshift Container Platform - OCP

Red Hat OpenShift is a unified platform to build, modernize, and deploy applications at scale. Work smarter and faster with a complete set of services for bringing apps to market on your choice of infrastructure.

Red Hat OpenShift Container Platforms leverages Kubernetes to provide business features that deliver a better user experience and a broader set of tools for enterprise needs.

RHOCP extends the features of Kubernetes by adding robust networking solutions, platform security, authentication, a full web console, an integrated image registry, as well as several other key functions to container-based workflows (templates, routes, projects ...)

Openshift Container Platform Overview
Installation Overview
Single Node Openshift (SNO): a documentation to install OpenShift on a single node.

OCP IPI: Installer Provisioned Infrastrucure

Download the installer binary(will install the latest OCP version) and the pull-secret.txt from Redhat Console: https://console.redhat.com/openshift/install/vsphere/installer-provisioned
To be able to install a specific version of OCP, use: Mirror Openshift
Documentations that can help
- https://github.com/openshift/installer/blob/master/docs/user/vsphere/
- https://docs.openshift.com/container-platform/4.13/installing/installing_vsphere/installing-vsphere-installer-provisioned-customizations.html

Customize Machine Pools

By default: 4 CPU - 16Go memory

Customize the CPU, corePerSocker, memory of machines pools
https://github.com/openshift/installer/blob/master/docs/user/vsphere/customization.md#custom-machine-pools

within the platform key in your existing install-confilefile, you can add custom values for CPU and memory before creating the cluster

apiVersion: v1
baseDomain: example.com
controlPlane:
  name: master
  # platform: {}
  platform:
    # here
    vsphere:
      cpus: 8
      coresPerSocket: 2
      memoryMB: 24576
      osDisk:
        diskSizeGB: 512
  replicas: 3
compute:
- name: worker
  # platform: {}
  platform:
   # here
    vsphere:
      cpus: 8
      coresPerSocket: 2
      memoryMB: 24576
      osDisk:
        diskSizeGB: 512
  replicas: 5

Create Openshift Cluster Using IPI - vSphere

Installation parameters:

Network: myntework_1= 192.168.213.x
Datastore: ssd-000404
VIP API: 192.168.213.4
VIP Ingress: 192.168.213.5
Base domain: hp.example.com
Cluster name: mycluster

# working dir
cd ~/workspace/ocp

tar -zvxf openshift-install-linux-4.13.21.tar.gz
#openshift-install-linux.tar.gz 

# generate a dedicated SSH keys for your cluster
ssh-keygen -t rsa -b 4096 -C "mycluster"  -f ~/.ssh/mycluster-id_rsa

# create the cluster folder
mkdir mycluster

# create config file
./openshift-install --dir=./mycluster  create install-config 
## select ~/.ssh/mycluster-id_rsa as ssh key

# check config file
cat mycluster/install-config.yaml


# DNS registration 
## vip url should be registered in DNS
## api.<cluster-name>.<base-domain> API VIP
## *.apps.<cluster-name>.<base-domain>  Ingress VIP
##
## If you plan to do it later, you should ATLEAST add in your /etc/hosts:  API_VIP api.<cluster-name>.<base-domain>
## to avoid the install failure during the API UP check: https://API_VIP api.<cluster-name>.<base-domain>:6443


# create a cluster
./openshift-install --dir=./mycluster  create cluster

INFO Consuming Install Config from target directory 
INFO Obtaining RHCOS image file from 'https://rhcos.mirror.openshift.com/art/storage/prod/streams/4.13-9.2/builds/413.92.202307260246-0/x86_64/rhcos-413.92.202307260246-0-vmware.x86_64.ova?sha256=4b2caacc4d5dc69aabe3733a86e0a5ac0b41bbe1c090034c4fa33faf582a0476' 
INFO The file was found in cache: /home/xxx/.cache/openshift-installer/image_cache/rhcos-413.92.202307260246-0-vmware.x86_64.ova. Reusing... 
INFO Creating infrastructure resources...         
INFO Waiting up to 20m0s (until 3:58PM) for the Kubernetes API at https://api.mycluster.hp.example.com:6443... 
INFO API v1.26.9+636f2be up                       
INFO Waiting up to 1h0m0s (until 4:38PM) for bootstrapping to complete... 
INFO Destroying the bootstrap resources...        
INFO Waiting up to 40m0s (until 4:34PM) for the cluster at https://api.mycluster.hp.example.com:6443 to initialize... 
INFO Checking to see if there is a route at openshift-console/console... 
INFO Install complete!                            
INFO To access the cluster as the system:admin user when using 'oc', run 'export KUBECONFIG=/home/xx/workspace/ocp/mycluster/auth/kubeconfig' 
INFO Access the OpenShift web-console here: https://console-openshift-console.apps.mycluster.hp.example.com
INFO Login to the console with user: "kubeadmin", and password: "xxx" 
INFO Time elapsed: 50m58s

install-config template

install-configtemplate

  additionalTrustBundlePolicy: Proxyonly
  apiVersion: v1
  baseDomain: hp.example.com
  compute:
  - architecture: amd64
    hyperthreading: Enabled
    name: worker
    platform: {}
    replicas: 3
  controlPlane:
    architecture: amd64
    hyperthreading: Enabled
    name: master
    platform: {}
    replicas: 3
  metadata:
    creationTimestamp: null
    name: mycluster
  networking:
    clusterNetwork:
    - cidr: 10.128.0.0/14
      hostPrefix: 23
    machineNetwork:
    - cidr: 10.0.0.0/16
    networkType: OVNKubernetes
    serviceNetwork:
    - 172.30.0.0/16
  platform:
    vsphere:
      apiVIPs:
      - 192.168.213.4
      failureDomains:
      - name: generated-failure-domain
        region: generated-region
        server: pcc-zz-xzy-xx-yy.exmaple.com
        topology:
          computeCluster: /pcc-xx-xx_datacenterYYY/host/Cluster1
          datacenter: pcc-xx-xx_datacenterYYY
          datastore: /pcc-xx-xx_datacenterYYY/datastore/Shared Storages/ssd-000404
          networks:
          - HP-EXPLOIT_213
          resourcePool: /pcc-xx-xx_datacenterYYY/host/Cluster1//Resources
        zone: generated-zone
      ingressVIPs:
      - 192.168.213.5
      vcenters:
      - datacenters:
        - pcc-xx-xx_datacenterYYY
        password: xxxx
        port: 443
        server: xxxx
        user: xxxx
  publish: External
  pullSecret: '{"auths":{"cloud.openshift.com":{"auth":"b3BNWFVSVA==","email":"xxx@example.com"},"quay.io":{"auth":"b3BlbnNRTFVSVA==","email":"xxx@example.com"},"registry.connect.redhat.com":{"auth":"fHVoYQ==","email":"xxx@example.com"}}}'
  sshKey: |
    ssh-rsa AAAiQ3F1aqpQ3VIYeQ== mycluster