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Purpose:

The Preflight script is designed to validate some environment settings on the appliance provisioning node before the cluster deployment is actually executed. By pre-checking certain requirements the use of this script can mitigate the need to spend time on a deployment that might ultimate fail and need to be rerun. Further the script produces a usable ironic_hosts.json, install-config.yaml and config_user.sh consumed by current methods of deployment: dev-scripts or install-scripts.

Dev-scripts: https://github.com/openshift-metal3/dev-scripts

Install-scripts: https://github.com/openshift-kni/install-scripts

What Preflight Requires:

The script requires that you feed it the Dell iDRAC IP addresses and the iDRAC username and password for the 3 master nodes and 1 worker node (the provisioning node is considered a worker node). There is also a -d switch which allows for the use of the default idrac information the current appliance ships with in a standard configuration. The script should be run from the provisioning node as a regular user with sudo.

What Preflight Does:

The script has multiple components and can be broken down into the following sections in order of execution:

  • Discovers the long hostname and short hostname from the provisioning node
  • Derives the cluster name and domain from the long hostname
  • Builds an initial Ansible inventory file from the iDRAC information provided or using defaults
  • Connects to each iDRAC via RedFISH and retrieves the MAC address information
  • Connects to the master nodes iDRAC via RedFish and ensures they are powered off
  • Validates that DNS records exist for (api|*.apps|ns1).clustername.domain
  • Adds MAC address information to Ansible inventory file
  • Validates that DNS records for master nodes exist
  • Uses Ansible to generate ironic_hosts.json, config_user.sh and install-config.yaml
  • Insert pullsecret into install-config.yaml and config_user.sh
  • Inserts sshkey into install-config.yaml and config_user.sh

Future Preflight:

The script might be altered in the future depending on what is required from the real OCP installer.

Impediments:

Currently the script relies on using whatever Dell hardware we have as official hardware is not yet in place.