OpenShift 3.6 Basic Guest Template

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Overview

This is the simplest possible guest template, which will be used as a base for various other types of guests or more complex templates.

Procedure

KVM Virtual Machine Template Creation

Make sure the required storage pools have been configured as described in the Virtualization Host Preparation page.

The template creation procedure is described in detail in the virt-install page. Drive the installation from the procedure described there, as it contains critical details.

The actual command is: 

virt-install 
  --name ocp36.basic-template
  --memory 1024 
  --vcpus 2 
  --os-variant=rhel7.4
  --location /iso-images/rhel-server-7.4-x86_64-dvd.iso
  --extra-args="console=tty0 console=ttyS0,115200n8"
  --disk=/iso-images/rhel-server-7.4-x86_64-dvd.iso,device=cdrom
  --disk=/main-storage-pool/ocp36.basic-template.qcow2,size=7
  --network default
  --graphics none

The command will enter in text interactive mode.

VMware Fusion Virtual Machine

VMware Fusion VMs

VirtualBox Virtual Machine

VirtualBox VMs

First-Boot Configuration

  • English/American
  • Network
    • Host name: basic-template.ocp36.local
    • eth0: 192.168.122.21/255.255.255.0/192.168.1.1, IPV6 ignore, nameservers: 8.8.8.8, connect automatically after reboot, apply configuration in installer.

Use a neutral address. The static IP address will be changed when the template is cloned into actual virtual machine instances.

  • Timezone 3 82, NTP server 129.6.15.28
  • Software selection: minimal install
  • Installation destination: vda, use all space, Standard partition.
  • Disable kdump
  • root password

More details about RHEL Minimal installation:

RHEL 7 Installation

Post-Boot Configuration and Validation

IP Address

ip addr

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
   link/ether 52:54:00:03:c4:35 brd ff:ff:ff:ff:ff:ff
   inet 192.168.122.21/24 brd 192.168.122.255 scope global eth0
      valid_lft forever preferred_lft forever
   ...

NetworkManager

OpenShift requires NetworkManager to be operational on all nodes (see https://docs.openshift.com/container-platform/3.6/install_config/install/prerequisites.html#prereq-networkmanager). Verify it works: 

nmcli g

Attach the Node to a RHEL Subscription

Follow the procedure described here:

Register a Linux System

and

Register a Standard RHEL Subscription

The summary is available below: 

subscription-manager register
subscription-manager refresh 
subscription-manager list --available --all
subscription-manager attach --pool=<pool-id> --quantity=1

Install Required Base Packages

yum install wget git net-tools bind-utils iptables-services bridge-utils bash-completion kexec kexec-tools sos psacct zip unzip rpcbind nfs-utils haproxy

Also see https://docs.openshift.com/container-platform/3.6/install_config/install/host_preparation.html#installing-base-packages

Update the Entire System

yum update -y

Reboot

Authorize Virtualization Host root's Public Key

cd
mkdir .ssh
echo "..." > .ssh/authorized_keys
chmod -R go-rwx .ssh
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