High Availability in Viya 4 inside Openshift

[alko13]

Hi,

We have a Viya 4 environment residing inside Redhat Openshift which is currently Non-HA. 

Now we want to implement this Viya environment as HA.

Is there official documentation from SAS to implement this?

Also is there a need to redeploy the environment?

Thanks in advance

[gwootton]

See the README.md file located in $deploy/sas-bases/examples/scaling/ha. There is a transformer in $deploy/sas-bases/overlays/scaling/ha/enable-ha-transformer.yaml you can add to your kustomization.yaml file that will convert your stateless services to HA. The stateful services are already HA by default (apart from CAS).

Once making the change to kustomization.yaml you would need to rebuild and apply your site.yaml.

Here is the relevant documentation:

Configure High Availability

https://go.documentation.sas.com/doc/en/sasadmincdc/v_045/dplyml0phy0dkr/n08u2yg8tdkb4jn18u8zsi6yfv3...

[alko13]

Thanks @gwootton 

Seems the documentation is clear for stateful and stateless, but if we also want to make the CAS and compute HA enabled, is it possible?

[gwootton]

Configuring CAS for high availability involves configuring a CAS backup controller:

CAS Backup Controller

https://go.documentation.sas.com/doc/en/sasadmincdc/v_045/calserverscas/n05000viyaservers000000admin...

The compute and launcher services are stateless services so would be captured by the previous patch. The compute/connect/batch servers launched are launched on demand. Having multiple compute nodes in your node pool would prevent an outage from one of those nodes going down.