Merge pull request sorintlab#789 from gvalsecchig/patch-1

doc: add OpenShift example

examples/openshift/README.md

@@ -0,0 +1,30 @@
+# Stolon inside openshift
+
+Compared to the kubernetes deployments few changes are required. The purpose of this document is to cover these additional steps.
+
+## Service account
+The best approch to deploy Stolon in openshift is to create a dedicate service account and assign it the required Security context constraints (scc).
+```
+oc create sa <service_account_name>
+```
+stolon_role.yaml and  role-binding.yaml must be modified to match service account name and the namespace for the cluster deployment
+
+As additional step assign anyuid scc to the service account:
+```
+oc adm policy add-scc-to-user anyuid system:serviceaccount:<namespace>:<service_account_name>
+```
+## Patch cluster components:
+Sentinel:
+```
+oc patch --local=true -f stolon-sentinel.yaml -p '{"spec":{"template":{"spec":{"serviceAccount": "<service_account_name>"}}}}' -o yaml > stolon-sentinel_new.yaml
+ ```
+ Keeper
+ ```
+ oc patch --local=true -f stolon-keeper.yaml -p '{"spec":{"template":{"spec":{"serviceAccount": "<service_account_name>"}}}}' -o yaml > stolon-keeper_new.yaml
+ ```
+ Proxy
+  ```
+ oc patch --local=true -f stolon-proxy.yaml -p '{"spec":{"template":{"spec":{"serviceAccount": "<service_account_name>"}}}}' -o yaml > stolon-proxy_new.yaml
+ ```
+## Deployment
+Deploy the Stolon components using the files created at the previous step.