What's this

This is an Ansible playbook that builds an *.iso file for creating a single-node OKD cluster with a static IP. By default, such an installation requires DHCP in the local network.

The automation steps are created based on the following manuals:

Minimum resource requirements

vCPU	Memory	Storage
6 vCPU cores	16G	120G

How to use

Install Ansible on your local machine using your favorite method.
Install Git.
Clone the repository.
Open create_sno_okd_iso_file.yml and set up variables.

Run Ansible with the command:

ansible-playbook ./create_sno_okd_iso_file.yml

Copy the *.iso file to your hypervisor and start the machine.
Post boot actions. After SNO vm boot via the customized ISO file, It will become a bootstrap node in the first time, no further action to take during this period, Once bootstrap process completed, the VM will automatically reboot and become a master node. This time the master node will have the static IP setting as we've already manipulated the master.ign file. but the hostname information won't be copied. Hence the master node will started with hostname localhost. We need correct it. Log in via SSH and use the following command
```
hostnamectl set-hostname sno-test
```
Try to open your OKD web interface using the following URL path: https://console-openshift-console.apps.<cluster_name>.<base_domain>

Playbook variables

Open the playbook create_sno_okd_iso_file.yml and edit the variables in the section:

vars:
    okd_version: "4.15.0-0.okd-2024-03-10-010116"
    arch: "x86_64"
    ...
    ssh_key: "ssh-rsa"

Or you can create a file external_vars.yml in the main repo folder and save you variables there. In this case variables in the file will have more priority.

Example content of external_vars.yml

vim external_vars.yml

Copy paste the following content into the file in the vim editor.

---
# in the above example, this would be external_vars.yml
okd_version: "4.15.0-0.okd-2024-03-10-010116"
arch: "x86_64"
base_folder: "/home/user/okd_iso_temp"
base_folder_prod: "/home/user/okd_iso"
# Cluster configuration
cluster_base_domain: "cn.ibm.com"
cluster_name: "sno-test"
cluster_cluster_networks_cidr: "10.128.0.0/14"
cluster_cluster_networks_hostprefix: "23"
cluster_service_network: "172.30.0.0/16"
# IP adress virtual machine for OKD single node
cluster_vm_machine_ip: "192.168.0.1"
# Virtual machine network adress with mask
cluster_machine_network: "192.168.0.0/24"
# Gateway ip adress virtual machine for OKD single node
cluster_vm_machine_gateway: "192.168.0.254"
# IP adress mask virtual machine for OKD single node
cluster_vm_machine_ip_mask: "255.255.255.0"
# Virtual machine interface name
cluster_vm_machine_interface_name: "eth0"
# DNS IP adress virtual machine for OKD single node
cluster_vm_machine_ip_dns: "8.8.8.8"
# Virtual machine disk path
cluster_installationdisk: "/dev/sda"
# Dummy pull secret for OKD. Fix bypass for pull-secret https://github.com/okd-project/okd/issues/182
pull_secret: '{"auths":{"fake":{"auth":"aWQ6cGFzcwo="}}}'
# SSH public key for virtual machine
ssh_key: "ssh-rsa"
is_debug: false

The external_vars.yml file, used for storing sensitive or environment-specific settings, is included in .gitignore to prevent it from being committed to the repository. This ensures security and allows developers to make local changes without affecting the shared codebase. It is recommended that each developer creates their own external_vars.yml file locally with the necessary configuration variables. Reference this file in your code as needed, but be aware it will not be tracked by Git.

Variable description

OKD version for installation

okd_version: "4.15.0-0.okd-2024-03-10-010116"

OKD architecture

arch: "x86_64"

Folder for bootstrapping

base_folder: "/home/user/okd_iso_temp"

Folder for saving ISO and credentials

base_folder_prod: "/home/user/okd_iso"

Cluster domain name

cluster_base_domain: "cn.ibm.com"

Cluster name

cluster_name: "sno-test"

Cluster network settings

cluster_cluster_networks_cidr: "10.128.0.0/14"
cluster_cluster_networks_hostprefix: "23"
cluster_service_network: "172.30.0.0/16"

IP address of the virtual machine for the OKD single node

cluster_vm_machine_ip: "192.168.0.1"

Gateway IP address of the virtual machine for the OKD single node

cluster_vm_machine_gateway: "192.168.0.254"

IP address mask of the virtual machine for the OKD single node

cluster_vm_machine_ip_mask: "255.255.255.0"

Virtual machine interface name

cluster_vm_machine_interface_name: "eth0"

DNS IP address of the virtual machine for the OKD single node

cluster_vm_machine_ip_dns: "8.8.8.8"

Virtual machine disk path

cluster_installationdisk: "/dev/sda"

Dummy pull secret for OKD. Fix bypass for pull-secret

pull_secret: '{"auths":{"fake":{"auth":"aWQ6cGFzcwo="}}}'

More info on GitHub

SSH public key for the virtual machine

ssh_key: "ssh-rsa "

Debug

journalctl -b -f -u release-image.service -u bootkube.service

Check running containers

crictl ps

Known Issues

Credits

Installing OpenShift on a single node
Single Node OpenShift deployment with Static IP
Reddit user triplewho for his comment

kovalroma/single-node-okd-static-ip-installer