Configuring Impact as a cluster

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IBM® Tivoli® Netcool®/Impact can be configured on Red Hat® OpenShift® Container Platform as a cluster of nciservers for redundancy and scaling.

An Netcool/Impactserver cluster consists of the primary server and one or more secondary servers. In a cloud deployment, multiple nciervers can be run in a cluster within a single cloud instance.

Note: Only the nciserver can be configured as a cluster; the Netcool/Impact GUI cannot.

The primary nciserver must be fully running before you spin up more nciservers.

To configure Netcool/Impact in the cloud as a cluster, use the following steps:

Scale the Netcool/Impact statefulsets to zero.

oc scale sts <release_name>-nciserver --replicas=0
oc scale sts <release_name>-impactgui --replicas=0

Edit the <release_name>-nciserver statefulset and increase the NCISERVERS_REPLICA_COUNT value to the number of nciservers needed. This increase can be done in the GUI, or on the command line:
```
export IMPACTBACKENDSTS=$(oc get sts | grep nciserver | awk '{print $1}')
oc edit sts  $IMPACTBACKENDSTS
```
Then, search for the NCISERVERS_REPLICA_COUNT property and set it to the number of Netcool/Impact servers that you require, for example:
```
      - env:
        - name: NCISERVERS_REPLICA_COUNT
          value: "2"
```
Wait for the pod to restart, or manually restart by deleting the pod:
```
oc delete pod <release_name>-nciserver-0
```
Increase the pod count of the nciserver to match the NCISERVERS_REPLICA_COUNT value:
```
oc scale sts --replicas="number" <release_name>-nciserver
```
Note: It can take a few minutes for all the Impact server pods to come up sequentially.
Edit the statefulset of <release_name>-impactgui and set NCISERVERS_REPLICA_COUNT to the value used in nciserver statefulset. This increase can be done in the GUI, or on the command line:
```
export IMPACTGUISTS=$(oc get sts | grep impactgui | awk '{print $1}')
oc edit sts  $IMPACTGUISTS
```
Then, search for the property NCISERVERS_REPLICA_COUNT and set it to the number of Netcool/Impact servers you require, for example:
```
      - env:
        - name: NCISERVERS_REPLICA_COUNT
          value: "2"
```
Wait for the pod to restart, or manually restart by deleting the pod:
```
oc delete pod <release_name>-impactgui-0
```