To deploy kubespray on OpenStack uncomment the cloud_provider option in group_vars/all.yml and set it to 'openstack'.
After that make sure to source in your OpenStack credentials like you would do when using nova-client or neutron-client by using source path/to/your/openstack-rc or . path/to/your/openstack-rc.
The next step is to make sure the hostnames in your inventory file are identical to your instance names in OpenStack.
Otherwise cinder won't work as expected.
Unless you are using calico you can now run the playbook.
Additional step needed when using calico:
Calico does not encapsulate all packages with the hosts' ip addresses. Instead the packages will be routed with the PODs ip addresses directly.
OpenStack will filter and drop all packages from ips it does not know to prevent spoofing.
In order to make calico work on OpenStack you will need to tell OpenStack to allow calico's packages by allowing the network it uses.
First you will need the ids of your OpenStack instances that will run kubernetes:
openstack server list --project YOUR_PROJECT
+--------------------------------------+--------+----------------------------------+--------+-------------+
| ID | Name | Tenant ID | Status | Power State |
+--------------------------------------+--------+----------------------------------+--------+-------------+
| e1f48aad-df96-4bce-bf61-62ae12bf3f95 | k8s-1 | fba478440cb2444a9e5cf03717eb5d6f | ACTIVE | Running |
| 725cd548-6ea3-426b-baaa-e7306d3c8052 | k8s-2 | fba478440cb2444a9e5cf03717eb5d6f | ACTIVE | Running |
Then you can use the instance ids to find the connected neutron ports (though they are now configured through using OpenStack):
openstack port list -c id -c device_id --project YOUR_PROJECT
+--------------------------------------+--------------------------------------+
| id | device_id |
+--------------------------------------+--------------------------------------+
| 5662a4e0-e646-47f0-bf88-d80fbd2d99ef | e1f48aad-df96-4bce-bf61-62ae12bf3f95 |
| e5ae2045-a1e1-4e99-9aac-4353889449a7 | 725cd548-6ea3-426b-baaa-e7306d3c8052 |
Given the port ids on the left, you can set the two allowed_address(es) in OpenStack. Note that you have to allow both kube_service_addresses (default 10.233.0.0/18) and kube_pods_subnet (default 10.233.64.0/18.)
# allow kube_service_addresses and kube_pods_subnet network
openstack port set 5662a4e0-e646-47f0-bf88-d80fbd2d99ef --allowed_address ip_address=10.233.0.0/18,ip_address=10.233.64.0/18
openstack port set e5ae2045-a1e1-4e99-9aac-4353889449a7 --allowed_address ip_address=10.233.0.0/18,ip_address=10.233.64.0/18
Now you can finally run the playbook.