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authorTomas Sedovic <tomas@sedovic.cz>2018-01-04 16:18:26 +0100
committerTomas Sedovic <tomas@sedovic.cz>2018-01-10 13:47:52 +0100
commit103676bd17cc01fcc07efe76cffb65782d0d2ceb (patch)
treead4d0529f701bd7da3508509768815b99b6c71c4 /playbooks
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Write guide on setting up PVs with Cinder
Diffstat (limited to 'playbooks')
-rw-r--r--playbooks/openstack/advanced-configuration.md106
1 files changed, 106 insertions, 0 deletions
diff --git a/playbooks/openstack/advanced-configuration.md b/playbooks/openstack/advanced-configuration.md
index 2c9b70b5f..e809a7c02 100644
--- a/playbooks/openstack/advanced-configuration.md
+++ b/playbooks/openstack/advanced-configuration.md
@@ -372,6 +372,112 @@ In order to set a custom entrypoint, update `openshift_master_cluster_public_hos
Note than an empty hostname does not work, so if your domain is `openshift.example.com`,
you cannot set this value to simply `openshift.example.com`.
+
+## Using Cinder-backed Persistent Volumes
+
+You will need to set up OpenStack credentials. You can try putting this in your
+`inventory/group_vars/OSEv3.yml`:
+
+ openshift_cloudprovider_kind: openstack
+ openshift_cloudprovider_openstack_auth_url: "{{ lookup('env','OS_AUTH_URL') }}"
+ openshift_cloudprovider_openstack_username: "{{ lookup('env','OS_USERNAME') }}"
+ openshift_cloudprovider_openstack_password: "{{ lookup('env','OS_PASSWORD') }}"
+ openshift_cloudprovider_openstack_tenant_name: "{{ lookup('env','OS_PROJECT_NAME') }}"
+ openshift_cloudprovider_openstack_domain_name: "{{ lookup('env','OS_USER_DOMAIN_NAME') }}"
+ openshift_cloudprovider_openstack_block_storage_version: v2
+
+**NOTE**: you must specify the Block Storage version as v2, because OpenShift
+does not support the v3 API yet and the version detection is currently not
+working properly.
+
+For more information, consult the [Configuring for OpenStack page in the OpenShift documentation][openstack-credentials].
+
+[openstack-credentials]: https://docs.openshift.org/latest/install_config/configuring_openstack.html#install-config-configuring-openstack
+
+**NOTE** the OpenStack integration currently requires DNS to be configured and
+running and the `openshift_hostname` variable must match the Nova server name
+for each node. The cluster deployment will fail without it. If you use the
+provided OpenStack dynamic inventory and configure the
+`openshift_openstack_dns_nameservers` Ansible variable, this will be handled
+for you.
+
+After a successful deployment, the cluster is configured for Cinder persistent
+volumes.
+
+### Validation
+
+1. Log in and create a new project (with `oc login` and `oc new-project`)
+2. Create a file called `cinder-claim.yaml` with the following contents:
+
+```yaml
+apiVersion: "v1"
+kind: "PersistentVolumeClaim"
+metadata:
+ name: "claim1"
+spec:
+ accessModes:
+ - "ReadWriteOnce"
+ resources:
+ requests:
+ storage: "1Gi"
+```
+3. Run `oc create -f cinder-claim.yaml` to create the Persistent Volume Claim object in OpenShift
+4. Run `oc describe pvc claim1` to verify that the claim was created and its Status is `Bound`
+5. Run `openstack volume list`
+ * A new volume called `kubernetes-dynamic-pvc-UUID` should be created
+ * Its size should be `1`
+ * It should not be attached to any server
+6. Create a file called `mysql-pod.yaml` with the following contents:
+
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+ name: mysql
+ labels:
+ name: mysql
+spec:
+ containers:
+ - resources:
+ limits :
+ cpu: 0.5
+ image: openshift/mysql-55-centos7
+ name: mysql
+ env:
+ - name: MYSQL_ROOT_PASSWORD
+ value: yourpassword
+ - name: MYSQL_USER
+ value: wp_user
+ - name: MYSQL_PASSWORD
+ value: wp_pass
+ - name: MYSQL_DATABASE
+ value: wp_db
+ ports:
+ - containerPort: 3306
+ name: mysql
+ volumeMounts:
+ - name: mysql-persistent-storage
+ mountPath: /var/lib/mysql/data
+ volumes:
+ - name: mysql-persistent-storage
+ persistentVolumeClaim:
+ claimName: claim1
+```
+
+7. Run `oc create -f mysql-pod.yaml` to create the pod
+8. Run `oc describe pod mysql`
+ * Its events should show that the pod has successfully attached the volume above
+ * It should show no errors
+ * `openstack volume list` should show the volume attached to an OpenShift app node
+ * NOTE: this can take several seconds
+9. After a while, `oc get pod` should show the `mysql` pod as running
+10. Run `oc delete pod mysql` to remove the pod
+ * The Cinder volume should no longer be attached
+11. Run `oc delete pvc claim1` to remove the volume claim
+ * The Cinder volume should be deleted
+
+
+
## Creating and using a Cinder volume for the OpenShift registry
You can optionally have the playbooks create a Cinder volume and set