manila-kube on RDOCloud

This playbook creates a kubernetes cluster in the RDOCloud and sets up a minimal devstack environment there with the CephNFS backend.

There it deploys Robert Vaskek's manila-csi plugin for cloud_provider_openstack.

The playbook borrows heavily from Luis Pabon's vagrant with playbook for setting up the same sort of k8s cluster locally with libvirt: [email protected]:lpabon/kubeup.git.

The playbook has been tested thus far on Fedora 29 and 30.

[centos@worker0 ~]$ kubectl get nodes
NAME               STATUS   ROLES    AGE   VERSION
master.rdocloud    Ready    master   14h   v1.14.1
worker0.rdocloud   Ready    <none>   9h    v1.14.1
worker1.rdocloud   Ready    <none>   9h    v1.14.1
worker2.rdocloud   Ready    <none>   9h    v1.14.1

[centos@worker0 ~]$ manila service-list
+----+------------------+-----------------------------+---------------+---------+-------+------------+
| Id | Binary           | Host                        | Zone          | Status  | State | Updated_at |
+----+------------------+-----------------------------+---------------+---------+-------+------------+
| 1  | manila-share     | worker0.rdocloud@cephfsnfs1 | manila-zone-0 | enabled | down  | None       |
| 2  | manila-scheduler | worker0.rdocloud            | nova          | enabled | down  | None       |
| 3  | manila-data      | worker0.rdocloud            | nova          | enabled | down  | None       |
+----+------------------+-----------------------------+---------------+---------+-------+------------+

Prerequisites

We assume that you have credentials to use RDOCloud and that you have set them up in ${HOME}/.config/openstack/clouds.yaml along the following lines. You can copy the clouds.yaml.sample into ~/.config/openstack/clouds.yaml and make necessary changes.

$ cat ~/.config/openstack/clouds.yaml
clouds:
  rdo-cloud:
      auth:
          auth_url: https://phx2.cloud.rdoproject.org:13000/v3
          project_name: <your-project-name>
          user_domain_name: Default
          project_domain_name: Default
          username: <your-user-name>
          password: <your-password>
      region: RegionOne

The ansible playbook needs the shade library. In Fedora 29 run sudo dnf -y install python3-shade.

Before you run the playbook edit copy keys.yml.sample to keys.yml and edit the latter with the paths to your public and private ssh keys:

$ cat keys.yml.sample
---
# Set the name of the key known to the OpenStack cloud.
key_name: devstack_keypair
# Set the name of the local private key file associated
# with the named key.
private_key_file: "/path/to/your/private/key"
public_key_file: "/path/to/your/public/key"

Note that the playbook starts four m1.large Nova instances in RDO Cloud. Check your remaining quota before running. You can scale down the number of worker nodes by editing roles/local/tasks/main.yml.

Playbooks

Deploy

Now you can run the playbook:

$ ansible-playbook site.yml

The playbook will set up an appropriate security group, keypair, and private network, and a router to connect the private network to the RDOCloud public network. It boots up four Nova VMs that comprise the k8s cluster -- one master node and three workers -- installs kubeadm, and runs kubeadm to set up the cluster.

For convenience, the playbook installs scripts, e.g. login-worker0.sh, in the local directory that you can use to login to the nodes in the cluster.

On worker0, the playbook installs devstack using a local.conf that starts up only the minimal services -- keystone, mariadb, and rabbit -- needed to run manila with a CephFS with NFS back end.

If you want to run more OpenStack services or run with other back ends you can edit roles/devstack/files/local.conf before running the playbook.

Cleanup

If you need to start over and you need to clean your environment, you can use the cleanup.yml playbook.

Just run:

$ ansible-playbook cleanup.yml

This playbook will remove the created instances, the security group and the network resources that were allocated.