Subscribe to our blog

OpenShift Assisted Installer is a user-friendly OpenShift installation solution for the various platforms, but focused on bare metal.

It comprises two key components:

The Assisted Service provides hosting of installation artifacts (Ignition files, installation configuration, discovery ISO), exposed UI or REST API, etc.

Assisted Installer provide the following advantages:

  • A web interface to perform cluster installation without having to create the installation configuration file.
  • Boostrap machine is no longer required, the bootstrapping process takes place on a random node of the cluster.
  • A simplified deployment model that does not require in-depth knowledge of OpenShift.
  • Flexible API.
  • Deploying Single Node OpenShift (SNO).
  • Installing OpenShift Virtualization and OpenShift Data Foundation (formerly OpenShift Container Storage) from the web interface.

This article is the first in a series of two articles covering Assisted Installer installation. The second part of article explains implemented high availability (HA) and load balancing (LB).

Prerequisites

Network settings are performed in the following modes:

  • Cluster-Managed Networking.
  • User-Managed Networking.

Assisted Installer requires underlying infrastructure (DNS/DHCP/LB) in User-Managed Networking mode. By default, Assisted Installer expects existing DHCP in both modes. However, it is also possible to use the Assisted Service API to configure static configuration via NMState

CoreDNS provides an internal name resolution within the cluster. External access to the requires either an external DNS server or static entries in the hosts file.

Cluster details

Login to RedHat Hybrid Cloud Console

Click Create cluster to start the process.

ai_install_01

Complete the Cluster name, Base Domain and choose OpenShift version.  At this step, it is possible to select the SNO installation and change the pull secret if necessary.

ai_install_02

 

Click Next

Host discovery

Here we can choose to install OpenShift Virtualization and OpenShift Data Foundation (ODF). By default ODF will use all non-installation disks for local storage.

Click Add hosts

ai_install_03

 

Choose Full image file and paste SSH-public key for cluster nodes SSH access. The difference between Full image file and Minimal image file it that Full image file is Red Hat Enterprise Linux CoreOS (RHCOS) live ISO with embedded Ignition config. The Minimal image file is significantly smaller because rootfs downloaded during the RHCOS installation.

ai_install_04

 

Click Generate Discovery ISO

Download the created image using any convenient method.

ai_install_05

Mount downloaded ISO to all necessary servers via BMC (IPMI).

Boot from the mounted virtual device.

The installation process starts automatically.

After a while, the servers will appear in the RedHat Hybrid Cloud Console.

ai_install_06

It is possible to change the cluster node hostname, role, and installation disk.

ai_install_06_01

When all nodes will be in Ready state, click Next.

Networking

Choose Cluster-Managed Networking.

Complete Available subnet, API Virtual API and Ingress Virtual API. Please note that VIP addresses cannot be the same.

ai_install_07_01

Also, it is possible to allocate IP addresses via DHCP and Use advanced networking for additional network configuration. For example, change cluster network, cluster network host prefix, service network and choose OpenShift SDN or Open Virtual Networking(OVN).

ai_install_07_03

Click Next

Configuration review

Review the configuration and click Install cluster

ai_install_08_00

Wait for the installation process to finish. During the installation of the cluster, the nodes will reboot several times.

Click View cluster events to show cluster setup events.

ai_install_08_01

ai_install_09

ai_install_10

Finished installation

After installing the cluster, download kubeconfig and save the kubeadmin password.

The next part of the article will describe the HA and LB implementation.


About the author

Browse by channel

automation icon

Automation

The latest on IT automation for tech, teams, and environments

AI icon

Artificial intelligence

Updates on the platforms that free customers to run AI workloads anywhere

open hybrid cloud icon

Open hybrid cloud

Explore how we build a more flexible future with hybrid cloud

security icon

Security

The latest on how we reduce risks across environments and technologies

edge icon

Edge computing

Updates on the platforms that simplify operations at the edge

Infrastructure icon

Infrastructure

The latest on the world’s leading enterprise Linux platform

application development icon

Applications

Inside our solutions to the toughest application challenges

Original series icon

Original shows

Entertaining stories from the makers and leaders in enterprise tech