OCP 4.x VMware vSphere and Hybrid UPI Automation

Table of Contents

• Quickstart
• Prerequisites
• Installation Steps
  • Variables
  • Set Ansible Inventory and Configuration
  • Run Installation Playbook
  • Miscellaneous
  • Expected Outcome
• Post Install (Hybrid clusters)
• Final Check:
• In the works and wishlist (Call to arms)
  • Actively in development
  • Wishlist

Note	This repository was derived from the original works of Mike Allmen and Vijay Chintalapati located in the Official Red Hat Official GitHub repo

The goal of this repo is to automate the deployment (and redeployment) of OpenShift v4 clusters. Using the same repo and with minor tweaks, it can be applied to any version of OpenShift higher than 4.4. As it stands right now, the repo works for several installation use cases:

• vSphere cluster (3 node master only or traditional 5+ node clusters with worker nodes)

• Hybrid cluster (vSphere masters and baremetal workers)

• Static IPs for nodes (lack of isolated network to let helper run DHCP server)

• DHCP/Dynamic IPs for nodes (requires reservations in DHCP server config)

• w/o Cluster-wide Proxy (HTTP and SSL/TLS with certs supported)

• Restricted network (with or without DHCP)

• No Cloud Provider (Useful for mixed clusters with both virtual and physical Nodes)

This repo is most ideal for Home Lab and Proof-of-Concept scenarios. Having said that, if prerequisites (below) can be met and if the vCenter service account can be locked down to access only certain resources and perform only certain actions, the same repo can then be used for DEV or higher environments. Refer to the Required vCenter account privileges section in the OCP documentation for more details on required permissions for a vCenter service account.

Quickstart

The quickstart section is a brief summary of everything you need to do to use this repo. There are more details later in this document.

1. Setup helper node or ensure appropriate services (DNS/DHCP/LB/etc.) are available and properly referenced.

2. Copy group_vars/all.yml into a new file under the clusters folder named the same as your cluster with a .yaml extension and only change the parts that are required

3. Customize ansible.cfg and use/copy/modify staging inventory file as required

4. Run one of the several install options

Note	In your cluster vars file created in step 2 you only need to add override vars. The group_vars/all.yaml file will be the defaults if not overridden in the cluster file.

Prerequisites

1. vSphere ESXi and vCenter 6.7 (or higher) installed

2. A datacenter created with a vSphere host added to it, a datastore exists and has adequate capacity

3. The playbook(s) assumes you are running a helper node in the same network to provide all the necessary services such as [DHCP/DNS/HAProxy as LB]. Also, the MAC addresses for the machines should match between helper repo and this. If not using the helper node, the minimum expectation is that the webserver and tftp server (for PXE boot) are running on the same external host, which we will then treat as a helper node.

4. The necessary services such as [DNS/DHCP/LB(Load Balancer)] must be up and running before this repo can be used

5. Python 3+ and the following modules installed

   • openshift

6. Ansible 2.11+

7. Ansible Galaxy modules

   • kubernetes.core

   • community.general

   • community.crypto

   • community.vmware

   • ansible.posix

Installation Steps

Variables

Pre-populated entries in group_vars/all.yml are used as default values, to customize further you need to create a cluster file under the clusters folder. Any updates described below refer to changes made in cluster files (See: example cluster file) unless otherwise specified.

Default Values (Too much detail? Click here.)

group_vars/all.yml

• The helper_vm_ip and helper_vm_port are used to build the bootstrap_ignition_url and the no_proxy values if there is a proxy in the environment.

• The config key and it’s child keys are for cluster settings

• The nodes key is how you define the nodes, this array will get further split by type as set in each node object.

  • If you delete macaddr from the node dictionaries VMware will auto-generate your MAC addresses. If you are using DHCP, defining macaddr will allow you to reserve the specified IP addresses on your DHCP server to ensure the OpenShift nodes always get the same IP address.

• The vm_mods key allows you to specify hotadd and core_per_socket options on the vms. These settings are optional.

• The static_ips key and it’s child keys are used for non-DHCP configurations.

• The network_modifications key Network CIDRs default to sensible ranges. If a conflict is present (these ranges of addresses are assigned elsewhere in the organization), you may select other non-conflicting CIDR ranges by changing "enabled: false" to "enabled: true" and entering the new ranges. The ranges shown in the repository are the ones that are used by default, even if "enabled: false" is left as it is.

  • The machine network is the network on which the VMs are created. Be sure to specify the right machine network if you set enabled: true

• The proxy key and it’s child keys are for configuring cluster-wide proxy settings

• The registry key and it’s child keys are for configuring offline or disconnected registries for clusters in restricted networks

• The ntp key and it’s child keys are for configuring time servers to keep the cluster in sync

• The f5 key and it’s child keys are for configuring the F5 Load Balancer (if applicable)

Set Ansible Inventory and Configuration

Now configure ansible.cfg and staging inventory file based on your environment before picking one of the 5 different install options listed below.

Update the staging inventory file

Under the webservers.hosts entry, use one of two options below:

1. localhost : if the ansible-playbook is being run on the same host as the webserver that would eventually host bootstrap.ign file

2. the IP address or FQDN of the machine that would run the webserver.

Update the ansible.cfg based on your needs

• Running the playbook as a root user

  • If the localhost runs the webserver

    [defaults]
    host_key_checking = False

• If the remote host runs the webserver

    [defaults]
    host_key_checking = False
    remote_user = root
    ask_pass = True

• Running the playbook as a non-root user

  • If the localhost runs the webserver

    [defaults]
    host_key_checking = False

    [privilege_escalation]
    become_ask_pass = True

• If the remote host runs the webserver

    [defaults]
    host_key_checking = False
    remote_user = root
    ask_pass = True

    [privilege_escalation]
    become_ask_pass = True

Run Installation Playbook

Static IPs

# Option 1: Static IPs + use of OVA template
ansible-playbook -i staging -e cluster=[cluster_name] static_ips_ova.yml

# Option 2: ISO + Static IPs
ansible-playbook -i staging -e cluster=[cluster_name] static_ips.yml

DHCP - Refer to restricted.adoc[] file for more details

# Option 3: DHCP + use of OVA template
ansible-playbook -i staging -e cluster=[cluster_name] dhcp_ova.yml

# Option 4: DHCP + PXE boot
ansible-playbook -i staging -e cluster=[cluster_name] dhcp_pxe.yml

Restricted Networks - Refer to restricted.adoc file for more details

# Option 5: DHCP + use of OVA template in a Restricted Network
ansible-playbook -i staging -e cluster=[cluster_name] restricted_dhcp_ova.yml

# Option 6: Static IPs + use of ISO images in a Restricted Network
ansible-playbook -i staging -e cluster=[cluster_name] restricted_static_ips.yml


# Option 7: Static IPs + use of OVA template in a Restricted Network
# Note: OpenShift 4.6 or higher required
ansible-playbook -i staging -e cluster=[cluster_name] restricted_static_ips_ova.yml

Miscellaneous

• If you are re-running the installation playbook make sure to blow away any existing VMs (in ocp4 folder) listed below:

  • bootstrap

  • masters

  • workers

  • rhcos-vmware template (if not using the extra param as shown below)

• If a template by the name rhcos-vmware already exists in vCenter, you want to reuse it and skip the OVA download from Red Hat and upload into vCenter, use the following extra param.

  -e skip_ova=true

• If you would rather want to clean all folders bin, downloads, install-dir and re-download all the artifacts, append the following to the command you chose in the first step

  -e clean=true

Expected Outcome

1. Necessary Linux packages installed for the installation. NOTE: support for Mac client to run this automation has been added but is not guaranteed to be complete

2. SSH key-pair generated, with key ~/.ssh/ocp4 and public key ~/.ssh/ocp4.pub

3. Necessary folders [bin, downloads, downloads/ISOs, install-dir] created

4. OpenShift client, install and .ova binaries downloaded to the downloads folder

5. Unzipped versions of the binaries installed in the bin folder

6. In the install-dir folder:

7. append-bootstrap.ign file with the HTTP URL of the boostrap.ign file

8. master.ign and worker.ign

9. base64 encoded files (append-bootstrap.64, master.64, worker.64) for (append-bootstrap.ign, master.ign, worker.ign) respectively. This step assumes you have base64 installed and in your $PATH

10. The bootstrap.ign is copied over to the web server in the designated location

11. A folder is created in the vCenter under the mentioned datacenter and the template is imported

12. The template file is edited to carry certain default settings and runtime parameters common to all the VMs

13. VMs (bootstrap, master0-2, worker0-2) are generated in the designated folder and (in state of) poweredon

Post Install (Hybrid clusters)

In the event that you need to add nodes to a hybrid cluster post install, there is a new_worker_iso.yml that can generate additional ISOs for new nodes. The requirements to this playbook are the same as the other playbooks here with 1 exception, you need to create a new {{ clusters_folder }}/{{ cluster }}_additional_nodes.yaml file. The format of that file is as follows:

Example 1. Additional node file

clusters/ocp-example_additional_nodes.yaml

By calling this file we override the node type arrays found in the main cluster file to either an empty array [] or an array of new nodes. This allows us to only create new ISOs not re-create any ISOs you have already created using the static_ips playbook and do not wish to re-create.

Note	If you wish to re-create any previously created ISOs then make sure that the node is represented in this file as well when calling this playbook.

Note	The role that we use for this playbook is a shared role and is used by the static_ips playbook as well. This means that we need the same variables defined in this playbook as we had defined in the static_ips playbook.

Example run

ansible-playbook -i staging -e "cluster=ocp-example" new_worker_isos.yml

Final Check:

If everything goes well you should be able validate the cluster using the included validateCluster.yml playbook.

$ ansible-playbook -i staging -e 'cluster=mycluster' -e "username=kubeadmin" -e "password=$(cat install-dir/auth/kubeadmin-password)" validateCluster.yml

You can also manually review with the following commands:

Manually review the cluster objects after install

oc --kubeconfig=$(pwd)/install-dir/auth/kubeconfig get nodes
oc --kubeconfig=$(pwd)/install-dir/auth/kubeconfig co
oc --kubeconfig=$(pwd)/install-dir/auth/kubeconfig get mcp
oc --kubeconfig=$(pwd)/install-dir/auth/kubeconfig get csr

Note	You can also export KUBECONFIG=$(pwd)/install-dir/auth/kubeconfig rather than using --kubeconfig= on oc commands. Always remember to unset KUBECONFIG when done though to avoid corrupting your system:admin kubeconfig. It is the only copy of this special users kubeconfig.

In the works and wishlist (Call to arms)

Note	Contributions are Welcomed!

This repo is always in a state of development and as we all know OpenShift updates/changes can often break automation code. This means that we will from time to time need to update plays, tasks, and even vars to reflect these new changes. Also, this is a derived work and not all of the code has been thoroughly tested (specifically restricted and dhcp requires updating). So please, do feel free to fork this code and contribute changes where needed!

Actively in development

• Code cleanup/refactoring

Wishlist

• More common roles and tasks and less duplication of code

• One playbook to rule them all (using tags?)