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OpenShift on OpenStack

Spawning OpenShift on OSP 13

Use the official guide: https://access.redhat.com/documentation/en-us/openshift_container_platform/4.5/html/installing/installing-on-openstack

Prerequisites

Create working directory:

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mkdir clouds
cd clouds

Generate clouds.yaml: * https://andreaskaris.github.io/blog/openstack/using_clouds_yaml/

Update quotas:

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project=$(openstack project list | awk '/admin/ {print $2}')
openstack --os-cloud openstack quota set \
  --secgroups 20 --secgroup-rules 120 --ports 200 --routers 40 \
  --ram 307200 --cores 100 --gigabytes 500 \
  $project

Or consider disabling quotas altogether:

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openstack quota set --secgroups -1 --secgroup-rules -1 --cores -1 --ram -1 --gigabytes -1 $project

Also if it's necessary to spawn a higher number of workers:

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nova quota-class-update default --instances -1 --ram -1 --cores -1

Create flavor:

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openstack --os-cloud openstack flavor create --disk 25 --ram 32768 --vcpus 8 m1.openshift
# If using hugepages for instances:
# openstack flavor set --property hw:cpu_policy=dedicated  --property hw:mem_page_size=large m1.openshift

Download the installer and client, for example:

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curl -O https://mirror.openshift.com/pub/openshift-v4/clients/ocp/latest-4.5/openshift-install-linux.tar.gz
curl -O https://mirror.openshift.com/pub/openshift-v4/clients/ocp/latest-4.5/openshift-client-linux.tar.gz
sudo tar -xf openshift-install-linux.tar.gz -C /usr/local/bin
sudo tar -xf openshift-client-linux.tar.gz -C /usr/local/bin

Create the pull-secret in pull-secret.txt:

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cat <<'EOF' > pull-secret.txt
(... pull-secret here ...)
EOF

Create the install-config:

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openshift-install create install-config --dir=install-config

Make sure to update /etc/hosts with the API endpoint (api.<cluster name>.<domain>):

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(overcloud) [stack@undercloud-0 clouds]$ grep api /etc/hosts
172.16.0.231 api.cluster.example.com

Deleting and recreating a cluster when something went wrong

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openshift-install destroy cluster  --dir install-config/  --log-level=info
rm -Rf install-config
cp -a install-backup installconfig
cp -a install-backup install-config/
openshift-install create cluster --dir=install-config/ --log-level=info

Last update: December 9, 2020