OpenShift Origin deployment on OVH Private Cloud - Mono-server

Automate a mono-server installation of your Openshift Origin instance

Last updated 19th September 2018


This first guide will go throught:

  1. create and configure a VM from the template we created earlier.
  2. basic configuration and hello world deployment on OpenShift


  • an access to a vSphere instance
  • a terminal with root access for package installation. It can be a Debian under WSL, CentOS, Ubuntu, ...

From your terminal, install ansible and govc.

If you use python-2, make sure to use ansible-2.7 or above due to issue #42237 otherwise, switch to python-3 and ansible-2.6.18

All variables are set in a vars.yml file that needs to be edited before running the playbooks

GOVC installation

govc is a Go client using the vSphere API. You can fetch the latest release from the Release page.

Tip: Due to the pull-request #1233 not released yet, please build your client from the source like descriped here

After an unzip or tar and chmod +x, you'll need to setup at least three environmnent variables.

export GOVC_URL=
export GOVC_USERNAME=username
export GOVC_PASSWORD=password

Tip: Edit a file activate with the three export commands and source it . activate from your terminal before running the scripts.

You can now try the following command

$ govc about
Name:         VMware vCenter Server
Vendor:       VMware, Inc.
Version:      6.0.0
Build:        7037394
OS type:      win32-x64
API type:     VirtualCenter
API version:  6.0
Product ID:   vpx
UUID:         xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

Create a master server

Gather parameters

The first step is to create a SSH key and set the variable ssh_key_pub to the path of the public key inside the vars.yml file.

Then, we need to select a valid public IP for our master node. Your private cloud cluster IP block is available via the OVH API.

The IP block can be retreived via a call on /1.0/ip. In case you have several clusters or IP blocks, additional filters can be used, like /1.0/ip?routedTo.serviceName=pcc-123-456-789-123&type=pcc. More info here

For this guide, will assume you get the IP block

Using the following code, you can easily extract the needed info from the OVH API or the IP block directly.

#!/usr/bin/env python3

import ovh # pip install ovh
import ipaddress # introduced in python3.3

if __name__ == '__main__':
    client = ovh.Client(endpoint=ENDPOINT, application_key=APP_KEY, application_secret=APP_SECRET, consumer_key=CONSUMER_KEY)
    blocks = client.get('/ip', **{'routedTo.serviceName': 'pcc-123-456-789-123', 'type': 'pcc'})
    # blocks = ['']
    for block in blocks:
        ip = ipaddress.ip_network(block)
        print("Found block {}".format(block))
        if ip.version != 4:
        print("Netmask: {.exploded}".format(ip.netmask))
        print("Gateway: {.exploded}".format(ip.broadcast_address-1))
        print("Reserved: {.exploded}, {.exploded}, {.exploded}".format(ip.network_address, ip.broadcast_address-3, ip.broadcast_address-2))
        print("Valid range: {.exploded} - {.exploded}".format(ip.network_address+1, ip.broadcast_address-4))

The output should look like

Found block 2001:41d0:68:5300::/56
Found block
Valid range: -

Let's pick as our master node IP and fill the ip, netmask, broadcast and gw variables in the vars.yml file

Master setup

The steps for the master node steup are:

  • Setting its hostname with the value of the variable hostname
  • Adding the public SSH key to the list of authorized keys
  • Disabling password authentication via SSH
  • Setting the DNS server
  • Enforcing SELINUX configuration
  • Configuring the network interface with the value gathered previously

All those tasks are summarised in the which will be generated from the template by Ansible.

The above can be done automated via

ansible-playbook -vvv --extra-vars @vars.yml deploy_master.yml

Setup Openshift

Several steps needs to be done before installing Openshift.

There are few packages dependencies like

  • httpd-tools for managing password authentication
  • unzip for extracting the archive
  • epel-release for installing latest ansible version
  • ansible itself for running playbook
  • jq for parsing JSON document from the command-line

Also to improve security, we'll modify the default hosts.localhost inventory file to enable HTPasswdPasswordIdentityProvider indentity provider.

The above can be done automated via

ansible-playbook -vvv --extra-vars @vars.yml setup_openshift.yml

Once done, we need to SSH to the host with ssh root@<your host ip> and the last missing steps are:

  • running the ansible installation playbook
cd openshift-ansible*
ansible-playbook -vv -i inventory/hosts.localhost playbooks/prerequisites.yml
ansible-playbook -vv -i inventory/hosts.localhost playbooks/deploy_cluster.yml
  • Configuring your adming account
htpasswd -c -b /etc/origin/master/htpasswd admin your_password
oc adm policy add-cluster-role-to-user cluster-admin admin
  • Run your first Hello-world example
oc run hello-world --replicas=2 --port=8080
oc expose deploymentconfig hello-world --type=NodePort --name=hello-world

You can get the exposed port via oc get service hello-world -o json | jq '.spec.ports[0].nodePort' and try to browse and do a cURL on http://<ip>:<exposed port>.

You just deployed a containerized web application on your Private Cloud with OpenShift!


We have learnt how to automate the setup an OpenShift origin mono-server setup

The next article will reuse the same template and cover the setup with one master and several nodes.

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