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=======================
Metrics Developer Guide
=======================

Anible File Organization
========================

Ansible-Server
--------------

Please follow the following file structure:

.. code-block:: bash

    ansible-server
    |   ansible.cfg
    |   hosts
    |
    +---group_vars
    |       all.yml
    |
    +---playbooks
    |       clean.yaml
    |       setup.yaml
    |
    \---roles
    +---clean-monitoring
    |   \---tasks
    |           main.yml
    |
    +---monitoring
        +---files
        |   |   monitoring-namespace.yaml
        |   |
        |   +---alertmanager
        |   |       alertmanager-config.yaml
        |   |       alertmanager-deployment.yaml
        |   |       alertmanager-service.yaml
        |   |       alertmanager1-deployment.yaml
        |   |       alertmanager1-service.yaml
        |   |
        |   +---cadvisor
        |   |       cadvisor-daemonset.yaml
        |   |       cadvisor-service.yaml
        |   |
        |   +---collectd-exporter
        |   |       collectd-exporter-deployment.yaml
        |   |       collectd-exporter-service.yaml
        |   |
        |   +---grafana
        |   |       grafana-datasource-config.yaml
        |   |       grafana-deployment.yaml
        |   |       grafana-pv.yaml
        |   |       grafana-pvc.yaml
        |   |       grafana-service.yaml
        |   |
        |   +---kube-state-metrics
        |   |       kube-state-metrics-deployment.yaml
        |   |       kube-state-metrics-service.yaml
        |   |
        |   +---node-exporter
        |   |       nodeexporter-daemonset.yaml
        |   |       nodeexporter-service.yaml
        |   |
        |   \---prometheus
        |           main-prometheus-service.yaml
        |           prometheus-config.yaml
        |           prometheus-deployment.yaml
        |           prometheus-pv.yaml
        |           prometheus-pvc.yaml
        |           prometheus-service.yaml
        |           prometheus1-deployment.yaml
        |           prometheus1-service.yaml
        |
        \---tasks
               main.yml


Ansible - Client
----------------

Please follow the following file structure:

.. code-block:: bash

    ansible-server
    |   ansible.cfg
    |   hosts
    |
    +---group_vars
    |       all.yml
    |
    +---playbooks
    |       clean.yaml
    |       setup.yaml
    |
    \---roles
        +---clean-collectd
        |   \---tasks
        |           main.yml
        |
        +---collectd
            +---files
            |       collectd.conf.j2
            |
            \---tasks
                    main.yml


Summary of Roles
================

A brief description of the Ansible playbook roles,
which are used to deploy the  monitoring cluster

Ansible Server Roles
--------------------

Ansible Server, this part consists of the roles used to deploy
Prometheus Alertmanager Grafana stack on the server-side

Role: Monitoring
~~~~~~~~~~~~~~~~

Deployment and configuration of PAG stack along with collectd-exporter,
cadvisor and node-exporter.

Role: Clean-Monitoring
~~~~~~~~~~~~~~~~~~~~~~

Removes all the components deployed by the Monitoring role.


File-Task Mapping and Configurable Parameters
================================================

Ansible Server
----------------

Role: Monitoring
~~~~~~~~~~~~~~~~~~~

Alert Manager
^^^^^^^^^^^^^^^

File: alertmanager-config.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/alertmanager/alertmanager-config.yaml

Task: Configures Receivers for alertmanager

Summary: A configmap, currently configures webhook for alertmanager,
can be used to configure any kind of receiver

Configurable Parameters:
    receiver.url: change to the webhook receiver's URL
    route: Can be used to add receivers


File: alertmanager-deployment.yaml
''''''''''''''''''''''''''''''''''
Path : monitoring/files/alertmanager/alertmanager-deployment.yaml

Task: Deploys alertmanager instance

Summary: A Deployment, deploys 1 replica of alertmanager


File: alertmanager-service.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/alertmanager/alertmanager-service.yaml

Task: Creates a K8s service for alertmanager

Summary: A Nodeport type of service, so that user can create "silences",
view the status of alerts from the native alertmanager dashboard / UI.

Configurable Parameters:
    spec.type: Options : NodePort, ClusterIP, LoadBalancer
    spec.ports: Edit / add ports to be handled by the service

**Note: alertmanager1-deployment, alertmanager1-service are the same as
alertmanager-deployment and alertmanager-service respectively.**

CAdvisor
^^^^^^^^^^^

File: cadvisor-daemonset.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/cadvisor/cadvisor-daemonset.yaml

Task: To create a cadvisor daemonset

Summary: A daemonset, used to scrape data of the kubernetes cluster itself,
its a daemonset so an instance is run on every node.

Configurable Parameters:
    spec.template.spec.ports: Port of the container


File: cadvisor-service.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/cadvisor/cadvisor-service.yaml

Task: To create a cadvisor service

Summary: A ClusterIP service for cadvisor to communicate with prometheus

Configurable Parameters:
    spec.ports: Add / Edit ports


Collectd Exporter
^^^^^^^^^^^^^^^^^^^^

File: collectd-exporter-deployment.yaml
''''''''''''''''''''''''''''''''''''''''''
Path : monitoring/files/collectd-exporter/collectd-exporter-deployment.yaml

Task: To create a collectd replica

Summary: A deployment, acts as receiver for collectd data sent by client machines,
prometheus pulls data from this exporter

Configurable Parameters:
    spec.template.spec.ports: Port of the container


File: collectd-exporter.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/collectd-exporter/collectd-exporter.yaml

Task: To create a collectd service

Summary: A NodePort service for collectd-exporter to hold data for prometheus
to scrape

Configurable Parameters:
    spec.ports: Add / Edit ports


Grafana
^^^^^^^^^

File: grafana-datasource-config.yaml
''''''''''''''''''''''''''''''''''''''''''
Path : monitoring/files/grafana/grafana-datasource-config.yaml

Task: To create config file for grafana

Summary: A configmap, adds prometheus datasource in grafana


File: grafana-deployment.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/grafana/grafana-deployment.yaml

Task: To create a grafana deployment

Summary: The grafana deployment creates a single replica of grafana,
with preconfigured prometheus datasource.

Configurable Parameters:
    spec.template.spec.ports: Edit ports
    spec.template.spec.env: Add / Edit environment variables


File: grafana-pv.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/grafana/grafana-pv.yaml

Task: To create a persistent volume for grafana

Summary: A persistent volume for grafana.

Configurable Parameters:
    spec.capacity.storage: Increase / decrease size
    spec.accessModes: To change the way PV is accessed.
    spec.nfs.server: To change the ip address of NFS server
    spec.nfs.path: To change the path of the server


File: grafana-pvc.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/grafana/grafana-pvc.yaml

Task: To create a persistent volume claim for grafana

Summary: A persistent volume claim for grafana.

Configurable Parameters:
    spec.resources.requests.storage: Increase / decrease size


File: grafana-service.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/grafana/grafana-service.yaml

Task: To create a service for grafana

Summary: A Nodeport type of service, so that users actually connect to,
view the dashboard / UI.

Configurable Parameters:
    spec.type: Options : NodePort, ClusterIP, LoadBalancer
    spec.ports: Edit / add ports to be handled by the service


Kube State Metrics
^^^^^^^^^^^^^^^^^^^^

File: kube-state-metrics-deployment.yaml
''''''''''''''''''''''''''''''''''''''''
Path : monitoring/files/kube-state-metrics/kube-state-metrics-deployment.yaml

Task: To create a kube-state-metrics instance

Summary: A deployment, used to collect metrics of the kubernetes cluster iteself

Configurable Parameters:
    spec.template.spec.containers.ports: Port of the container


File: kube-state-metrics-service.yaml
'''''''''''''''''''''''''''''''''''''
Path : monitoring/files/kube-state-metrics/kube-state-metrics-service.yaml

Task: To create a collectd service

Summary: A NodePort service for collectd-exporter to hold data for prometheus
to scrape

Configurable Parameters:
    spec.ports: Add / Edit ports


Node Exporter
^^^^^^^^^^^^^^^

File: node-exporter-daemonset.yaml
''''''''''''''''''''''''''''''''''
Path : monitoring/files/node-exporter/node-exporter-daemonset.yaml

Task: To create a node exporter daemonset

Summary: A daemonset, used to scrape data of the host machines / node,
its a daemonset so an instance is run on every node.

Configurable Parameters:
    spec.template.spec.ports: Port of the container


File: node-exporter-service.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/node-exporter/node-exporter-service.yaml

Task: To create a node exporter service

Summary: A ClusterIP service for node exporter to communicate with Prometheus

Configurable Parameters:
    spec.ports: Add / Edit ports


Prometheus
^^^^^^^^^^^^^

File: prometheus-config.yaml
''''''''''''''''''''''''''''''''''''''''''
Path : monitoring/files/prometheus/prometheus-config.yaml

Task: To create a config file for Prometheus

Summary: A configmap, adds alert rules.

Configurable Parameters:
    data.alert.rules: Add / Edit alert rules


File: prometheus-deployment.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/prometheus/prometheus-deployment.yaml

Task: To create a Prometheus deployment

Summary: The Prometheus deployment creates a single replica of Prometheus,
with preconfigured Prometheus datasource.

Configurable Parameters:
    spec.template.spec.affinity: To change the node affinity,
                                 make sure only 1 instance of prometheus is
                                 running on 1 node.

    spec.template.spec.ports: Add / Edit container port


File: prometheus-pv.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/prometheus/prometheus-pv.yaml

Task: To create a persistent volume for Prometheus

Summary: A persistent volume for Prometheus.

Configurable Parameters:
    spec.capacity.storage: Increase / decrease size
    spec.accessModes: To change the way PV is accessed.
    spec.hostpath.path: To change the path of the volume


File: prometheus-pvc.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/prometheus/prometheus-pvc.yaml

Task: To create a persistent volume claim for Prometheus

Summary: A persistent volume claim for Prometheus.

Configurable Parameters:
    spec.resources.requests.storage: Increase / decrease size


File: prometheus-service.yaml
'''''''''''''''''''''''''''''''''
Path : monitoring/files/prometheus/prometheus-service.yaml

Task: To create a service for prometheus

Summary: A Nodeport type of service, prometheus native dashboard
available here.

Configurable Parameters:
    spec.type: Options : NodePort, ClusterIP, LoadBalancer
    spec.ports: Edit / add ports to be handled by the service


File: main-prometheus-server.yaml
'''''''''''''''''''''''''''''''''''
Path: monitoring/files/prometheus/main-prometheus-service.yaml

Task: A service that connects both prometheus instances.

Summary: A Nodeport service for other services to connect to the Prometheus cluster.
As HA Prometheus needs to independent instances of Prometheus scraping the same inputs
having the same configuration

**Note: prometheus-deployment, prometheus1-service are the same as
prometheus-deployment and prometheus-service respectively.**


Ansible Client Roles
----------------------

Role: Collectd
~~~~~~~~~~~~~~~~~~

File: main.yml
^^^^^^^^^^^^^^^^
Path: collectd/tasks/main.yaml

Task: Install collectd along with prerequisites

Associated template file:

collectd.conf.j2
Path: collectd/files/collectd.conf.j2

Summary: Edit this file to change the default configuration to
be installed on the client's machine