[DOC] Installation guidelines for PaaS components
Guidelines for installation of Prometheus Stack and Cert-Manager
Issue-ID: OOM-2701
Signed-off-by: Sylwia Jakubek <sylwia.jakubek@nokia.com>
Change-Id: Id8d9787109df7a90eb1f938836e75cbdd3a904b8
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+.. This work is licensed under a Creative Commons Attribution 4.0
+.. International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. Copyright 2021 Nokia
+
+.. Links
+.. _Cert-Manager Installation documentation: https://cert-manager.io/docs/installation/kubernetes/
+.. _Cert-Manager kubectl plugin documentation: https://cert-manager.io/docs/usage/kubectl-plugin/
+
+.. _oom_setup_paas:
+
+ONAP PaaS set-up (optional)
+###########################
+
+Starting from Honolulu release, Cert-Manager and Prometheus Stack are a part
+of k8s PaaS for ONAP operations and can be optionally installed to provide
+additional functionality for ONAP engineers.
+
+The versions of PaaS compoents that are supported by OOM are as follows:
+
+.. table:: ONAP PaaS components
+
+ ============== ============= =================
+ Release Cert-Manager Prometheus Stack
+ ============== ============= =================
+ honolulu 1.2.0 13.x
+ ============== ============= =================
+
+This guide provides instructions on how to install the following PaaS
+components for ONAP:
+
+- Cert-Manager
+- Prometheus Stack
+
+Cert-Manager
+============
+
+Cert-Manager is a native Kubernetes certificate management controller.
+It can help with issuing certificates from a variety of sources, such as
+Let’s Encrypt, HashiCorp Vault, Venafi, a simple signing key pair, self
+signed or external issuers. It ensures certificates are valid and up to
+date, and attempt to renew certificates at a configured time before expiry.
+
+Installation steps
+------------------
+
+The recommended version of Cert-Manager for Kubernetes 1.19 is v1.2.0.
+Cert-Manager is deployed using regular YAML manifests which include all
+the needed resources (the CustomResourceDefinitions, cert-manager,
+namespace, and the webhook component).
+
+Full installation instructions, including details on how to configure extra
+functionality in Cert-Manager can be found in the
+`Cert-Manager Installation documentation`_.
+
+There is also a kubectl plugin (kubectl cert-manager) that can help you
+to manage cert-manager resources inside your cluster. For installation
+steps, please refer to `Cert-Manager kubectl plugin documentation`_.
+
+Installation can be as simple as::
+
+ > kubectl apply -f https://github.com/jetstack/cert-manager/releases/download/v1.2.0/cert-manager.yaml
+
+Prometheus Stack
+================
+
+Prometheus is an open-source systems monitoring and alerting toolkit with
+an active ecosystem.
+
+Kube Prometheus Stack is a collection of Kubernetes manifests, Grafana
+dashboards, and Prometheus rules combined with documentation and scripts to
+provide easy to operate end-to-end Kubernetes cluster monitoring with
+Prometheus using the Prometheus Operator. As it includes both Prometheus
+Operator and Grafana dashboards, there is no need to set up them separately.
+
+Installation steps
+------------------
+
+The recommended version of kube-prometheus-stack chart for
+Kubernetes 1.19 is 13.x (which is currently the latest major chart version),
+for example 13.3.1.
+
+In order to install Prometheus Stack, you must follow these steps:
+
+- Create the namespace for Prometheus Stack::
+
+ > kubectl create namespace prometheus
+
+- Add the prometheus-community Helm repository::
+
+ > helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
+
+- Update your local Helm chart repository cache::
+
+ > helm repo update
+
+- To install the kube-prometheus-stack Helm chart in latest version::
+
+ > helm install prometheus prometheus-community/kube-prometheus-stack --namespace=prometheus
+
+ To install the kube-prometheus-stack Helm chart in specific version, for example 13.3.1::
+
+ > helm install prometheus prometheus-community/kube-prometheus-stack --namespace=prometheus --version=13.3.1