shashank-k

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

shashank-k

Preparation for CKA with Kubernetes version 1.17.1 on REDHAT 8

What i need to know for the exam ? 🏁

%	Domain
08%	Application Lifecycle Management
12%	Installation, Configuration & Validation
19%	Core Concepts
11%	Networking

shashank-k

Vagrant.configure("2") do |config|

  config.vm.box = "trusty"
  config.vm.box_url = "https://cloud-images.ubuntu.com/vagrant/trusty/current/trusty-server-cloudimg-amd64-vagrant-disk1.box"

  config.vm.hostname = "devstack"

  # forward ssh keys from main host - handy for gerrit and github
  config.ssh.forward_agent = true

shashank-k

Folks, Leave me a comment / URL if something you like is missing!

Beginner Resources

Resource	Description
Kube Academy	https://kube.academy/
kuernetes-101	https://kube.academy/courses/kubernetes-101/
Docs Home	https://kubernetes.io/docs/home/
CKS CKA CKAD Simulator	https://killer.sh/

shashank-k

Questions are not from any actual exam!!!  



Q:  Create a job that calculates pi to 2000 decimal points using the container with the image named perl
and the following commands issued to the container:  ["perl",  "-Mbignum=bpi", "-wle", "print bpi(2000)"]
Once the job has completed, check the logs to and export the result to pi-result.txt.

Solution:

shashank-k

Kubectl output options

Let's look at some basic kubectl output options.

Our intention is to list nodes (with their AWS InstanceId) and Pods (sorted by node).

We can start with:

kubectl get no

shashank-k

The view ClusterRole doesn’t actually have permissions for the Cluster level objects like Nodes and Persistent Volume Claims. So we’ll have to create a new RBAC config.

First, we’ll create a new dashboard-viewonly ClusterRole:

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: dashboard-viewonly

shashank-k

#!/usr/bin/env python

import sys, paramiko

if len(sys.argv) < 5:
    print "args missing"
    sys.exit(1)

hostname = sys.argv[1]
password = sys.argv[2]

shashank-k

################################################################################
#############################  Monit control file  #############################
################################################################################


##
#
# Comments begin with a '#' and extend through the end of the line. Keywords
# are case insensitive. All path's MUST BE FULLY QUALIFIED, starting with '/'.
#

shashank-k

#!/usr/bin/env bash
set -e

# Formats any *.tf files according to the hashicorp convention
files=$(git diff --cached --name-only)
for f in $files
do
  if [ -e "$f" ] && [[ $f == *.tf ]]; then
    #terraform validate `dirname $f`
    terraform fmt $f