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The simplest way to override the values is to copy the entire values.yaml file into a separate file (I use ~/oof-pci/override-sndc.yaml) and modify the relevant parameters in that new file.  The new values are shown below.  We identify the repository with the source image name and tag, create a cluster of three ODL members, and create a redundant MySQL deployment of two instances.

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#################################################################
# Application configuration defaults.
#################################################################
# application images
repository: nexus3.onap.org:10001
repositoryOverride: registry.hub.docker.com
pullPolicy: Always
#image: onap/sdnc-image:1.4.1
image: ft3e0tab7p92qsoceonq/oof-pci-sdnr:1.4.2-SNAPSHOT

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mysql:
  nameOverride: sdnc-db
  service:
    name: sdnc-dbhost
    internalPort: 3306
  nfsprovisionerPrefix: sdnc
  sdnctlPrefix: sdnc
  persistence:
    mountSubPath: sdnc/mysql
    enabled: true
  disableNfsProvisioner: true
  replicaCount: 2
  geoEnabled: false

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# default number of instances
replicaCount: 3

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cd ~/git/oom/kubernetes
sudo helm deploy demo ./onaphelm install sdnc/ -n demo-sdnc --namespace onap -f ~/oof-pci/override-onap.yaml -f ~/oof-pci/override-sdnc.yaml

The parameter "demo" is used to preface each ONAP component with "demo-" so we have "demo-sdnc," for example.  The ".sdnc/onap" parameter instructs helm to use that directory to guide the deployment.  The "--namespace onap" parameter causes ONAP to be deployed into the kubernetes namespace "onap."  The "-f ~/oof-pci/override-onap.yaml -f ~/oof-pci/override-sdnc.yaml" parameters instruct helm to override the parameters in ~/git/oom/kubernetes/onap/values.yaml and ~/git/oom/kubernetes/sdnc/values.yaml file with the values in the files following the "-f" option.  There can be a series of override files, and the last file takes precedence.

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If there is already an instance SDNC installed, it must be deleted before installing a new version.  I use these commands.

sudo helm del demo-sdnc --purge
kubectl get persistentvolumes      -n onap | grep demo-sdnc | sed 's/\(^[^ ]\+\).*/kubectl delete persistentvolumes      -n onap \1/'
kubectl get persistentvolumeclaims -n onap | grep demo-sdnc | sed 's/\(^[^ ]\+\).*/kubectl delete persistentvolumeclaims -n onap \1/'
kubectl get secrets                -n onap | grep demo-sdnc | sed 's/\(^[^ ]\+\).*/kubectl delete secrets                -n onap \1/'
kubectl get clusterrolebindings    -n onap | grep demo-sdnc | sed 's/\(^[^ ]\+\).*/kubectl delete clusterrolebindings    -n onap \1/'

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