Updated installation instructions for helm installation

03-installing-osm.md

@@ -506,7 +506,7 @@ For additional options, see `osm --help` for more info, and check our OSM client
 
 ## Reference. Helm-based OSM installation
 
-With Release FOURTEEN, the deployment of OSM services (LCM, RO, NBI, NG-UI, etc.) in the community installer is done with a Helm chart.
+Since Release FOURTEEN, the deployment of OSM services (LCM, RO, NBI, NG-UI, etc.) in the community installer is done with a Helm chart.
 
 When OSM is installed, behind the scenes the following steps are done:
 
@@ -576,14 +576,24 @@ zookeeper-0                                           1/1     Running   1 (2d20h
 
 Assuming that you have a Kubernetes cluster, and you have bootstrapped a Juju controller there, it is possible to deploy OSM on top of that cluster.
 
-### Deploy MongoDB charm
+### Deploy MongoDB using helm chart
 
-```
-# The following instructions assume that juju client is installed,
-# the cloud "k8scloud" pointing to the K8s cluster has been added to juju,
-# and a Juju controller "osm" has been bootstrapped there
-juju add-model osm k8scloud
-juju deploy ch:mongodb-k8s -m osm
+The following instructions assume that helm is installed and default storage class is available in kubernetes cluster.
+
+```bash
+git clone "https://osm.etsi.org/gerrit/osm/devops"
+cd devops
+# Optionally check out a specific version
+# DESIRED_OSM_VERSION="15.0.0"
+# git checkout $DESIRED_OSM_VERSION
+
+MONGODB_HELM_VERSION="13.9.4"
+helm repo add bitnami https://charts.bitnami.com/bitnami
+helm repo update
+# Check that there are no errors and deploy
+helm template mongodb-k8s bitnami/mongodb -n osm  -f installers/helm/values/mongodb-values.yaml --version ${MONGODB_HELM_VERSION}
+# install mongodb
+helm install mongodb-k8s bitnami/mongodb -n osm --create-namespace -f installers/helm/values/mongodb-values.yaml --version ${MONGODB_HELM_VERSION}
 ```
 
 ### Deploy Cert-manager
@@ -633,11 +643,11 @@ OSM_VCA_PUBKEY=$(cat $HOME/.local/share/juju/ssh/juju_id_rsa.pub)
 Deploy OSM Helm chart:
 
 ```bash
-git clone "https://osm.etsi.org/gerrit/osm/devops"
+# Make sure you are in devops directory
 cd devops
 # Optionally check out a specific version
-# DESIRED_OSM_VERSION="14.0.0"
-#git checkout $DESIRED_OSM_VERSION
+# DESIRED_OSM_VERSION="15.0.0"
+# git checkout $DESIRED_OSM_VERSION
 
 # Check default values
 helm -n osm show values installers/helm/osm
@@ -656,6 +666,9 @@ OSM_HELM_OPTS="${OSM_HELM_OPTS} --set vca.cacert=${OSM_VCA_CACERT}"
 # OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.image.repositoryBase=opensourcemano"
 # OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.image.tag=14"
 
+# Build the helm chart dependencies 
+helm dependency build installers/helm/osm
+
 # Check that there are no errors
 helm -n osm template osm installers/helm/osm -f osm-values.yaml ${OSM_HELM_OPTS}