Components installation on Kubernetes Cluster

1. Prime objective

After having succesfully installed our Kubernetes Cluster with the core components : networking (CNI), ingress controller (nginx), external load balancer (metallb) and kubernetes dashboard (see https://github.com/saubriot/k8s_ansible) we can add useful components on our Kubernetes Cluster.

We will install :

• a default monitoring tool for Kubernetes : prometheus + grafana
• a default storage class for Kubernetes using a rook-ceph cluster for distributed storage

2. Second objective

Install useful components :

• CI/CD tools : gitea, harbor, drone ...
• Data components
• ...

3. How it works and prerequisites

3.1 How it works : short explanation

The ansible directory structure has been defined as followed :

• ansible : contains the main playbooks, the environments to deploy (under inventories) and the roles and tasks to execute (under roles)
  • prometheus.yml : install prometheus
  • rook-ceph.yml : install rook-ceph distributed storage
  • rook-ceph-nodes.yml : prepare nodes for rook-ceph installation : create mount points on each node
  • gitea.yml : install gitea code hosting
  • harbor.yml : install harbor repository
  • drone.yml : install drone Continuous Integration platform
  • template.yml : templating script for new component
  • inventories : contains information about the environments to deploy
    • demo : demo environment
      • hosts : contains the hosts list per role. Note : roles are matching the main playbooks
      • group_vars :
        • all : global settings : all settings (local temporary directory)
        • prometheus : settings for prometheus
        • rook-ceph : settings for rook-ceph
        • rook-ceph-nodes : settings for rook-ceph-nodes
        • gitea : settings for Gitea : a community managed lightweight code hosting solution written in Go
        • drone : settings for Drone : a self-service Continuous Integration platform
        • harbor : settings for harbor : a trusted cloud native repository for Kubernetes
  • roles
    • prometheus : rprometheus installation tasks to execute
    • rook-ceph : rook-ceph distributed storage installation tasks to execute
    • rook-ceph-nodes : rook-ceph-nodes distributed storage installation tasks to execute
    • gitea : gitea installation tasks to execute
    • harbor : harbor installation tasks to execute
    • drone : drone installation tasks to execute
    • template : templating for new component role

3.2. Prerequisites

Requires a Kubernetes cluster up and running. See https://github.com/saubriot/k8s_ansible for vagrant demo environment.

4. Components

4.1. Default monitoring : prometheus

See installation guide

4.2. Distributed storage and default storage class : rook-ceph

See installation guide

4.3. CI/CD components

4.3.a. A community managed lightweight code hosting : gitea

See installation guide

4.3.b. A trusted cloud native repository for Kubernetes : harbor

See installation guide

4.3.c. A self-service Continuous Integration platform : drone

See installation guide