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## Useful Commands

Get kubectl version

    kubectl version

Get cluster info:

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  // For all the confusing Prometheus configuration and
  // regular expressions,
  // explained in examples.


  // Remember, there are default values for each item if it's missing.
  // regex is (.*),
  // replacement is $1,
  // separator is ;
  // ,and action is replace 

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---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  labels:
    name: prometheus-deployment
  name: prometheus
spec:
  replicas: 1
  template:

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This exception appears to affect ansible when a playbook is executed from a host with several identities configured in the SSH agent (Tested on a development machine with 12 private keys).

I've noted this exception to be particulary common with AWS targets

Inventory configuration

Most tasks will run fine when we configure our inventory to use a specific private key.

We also need to set the IdentitiesOnly flag so that ssh does not attempt other authentication strategies.

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[{
	"name": "AC"
}, {
	"name": "AC PROPULSION"
}, {
	"name": "ACURA"
}, {
	"name": "A.D. TRAMONTANA"
}, {
	"name": "ALFA ROMEO"

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[
  "Abarth",
  "Alfa Romeo",
  "Aston Martin",
  "Audi",
  "Bentley",
  "BMW",
  "Bugatti",
  "Cadillac",
  "Chevrolet",

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• using Ansible command line:

ansible-playbook --connection=local 127.0.0.1 playbook.yml

• using inventory:

127.0.0.1 ansible_connection=local

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---
- hosts: all
  tasks:
  - name: Install prerequisites for Docker repository
    apt:
      name: ['apt-transport-https', 'ca-certificates', 'curl', 'gnupg2', 'software-properties-common']
      update_cache: yes

  - name: Add Docker GPG key
    apt_key: url=https://download.docker.com/linux/ubuntu/gpg

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Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

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Ansible playbook to setup HTTPS using Let's encrypt on nginx.

The Ansible playbook installs everything needed to serve static files from a nginx server over HTTPS.
The server pass A rating on [SSL Labs](https://www.ssllabs.com/).

To use:
 1. Install [Ansible](https://www.ansible.com/)
 2. Setup an Ubuntu 16.04 server accessible over ssh
 3. Create `/etc/ansible/hosts` according to template below and change example.com to your domain
 4. Copy the rest of the files to an empty directory (`playbook.yml` in the root of that folder and the rest in the `templates` subfolder)