topic Re: High Availability in Viya 4 inside Openshift in SAS Viya

High Availability in Viya 4 inside Openshift

alko13 — Mon, 13 Nov 2023 05:27:43 GMT

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

Re: High Availability in Viya 4 inside Openshift

gwootton — Mon, 13 Nov 2023 14:19:25 GMT

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/n08u2yg8tdkb4jn18u8zsi6yfv3d.htm#n14iqy05lb736yn1e01m2hmzu1xr

Re: High Availability in Viya 4 inside Openshift

alko13 — Tue, 14 Nov 2023 01:53:36 GMT

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?

Re: High Availability in Viya 4 inside Openshift

gwootton — Tue, 14 Nov 2023 14:42:18 GMT

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.htm#n05022viyaservers000000admin

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.