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Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

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FROM tomcat:8.0.51-jre8-alpine
EXPOSE 8080
RUN rm -rf /usr/local/tomcat/webapps/*
COPY target/*.war /usr/local/tomcat/webapps/ROOT.war
CMD ["runsvc.sh","run"]

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Docker Internals ,

1. Ubuntu Linux - to get the best experience as Docker is built for Linux and production deployments are on Linux https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-18-04 orhttps://linuxize.com/post/how-to-install-and-use-docker-on-ubuntu-18-04/

2. For Mac users its a  3 step process to run Ubuntu Linux and then install docker   -

3. Install vagrant/Virtualbox as per video        https://www.youtube.com/watch?v=4Ue1WmcHipg 2.  install ubuntu linux using vagrant$mkdir docker-ubuntu ; cd docker-ubuntu$vagrant init bento/ubuntu-18.04 $vagrant up --provider=virtualbox$vagrant ssh here you should be able to login to Ubuntu/Linux Follow the steps in below url or any urls provided in step 1 to install docker on Ubuntuhttps://linuxize.com/post/how-to-install-and-use-docker-on-ubuntu-18-04/

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vagrant init    # Initialize Vagrant by creating a .vagrant directory and the "Vagrantfile" file (configuration template). 
vagrant init ubuntu / trust    # Initialize Vagrant and install a ubuntu / trusty64 VM (It can be installed with other commands as well).
 
vagrant up           # Start a VM, if it is the first see it will provision it. 
vagrant resume       # Activate a previously suspended VM, it can also be done with "vagrant up". 
vagrant provision    # Provision a VM again according to the configuration. 
vagrant reload # Restarts       (loading the Vagrantfile file). Add - provision to provision.
 
vagrant ssh 		# Connect using ssh (it must be in the same directory). 

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Introduction to Kafka

Kafka acts as a kind of write-ahead log (WAL) that records messages to a persistent store (disk) and allows subscribers to read and apply these changes to their own stores in a system appropriate time-frame.

Terminology:

• Producers send messages to brokers
• Consumers read messages from brokers
• Messages are sent to a topic

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K3D Workshop

App Case-Study

A "simple" distributed app today.

• HTTP Rest API
• Task Workers (Queue consumers) and Crons (Periodic jobs)
• Web client
• Android / iOS client

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# -*- mode: ruby -*-
# vi: set ft=ruby ts=2 sw=2 expandtab:

Vagrant.configure(2) do |config|
  config.vm.box = "ubuntu/trusty64"
  config.vm.network "private_network", ip: "192.168.33.10"
  config.vm.provision "shell", inline: <<-SHELL
    echo 'deb http://www.rabbitmq.com/debian/ testing main' >/etc/apt/sources.list.d/rabbitmq.list
    wget http://www.rabbitmq.com/rabbitmq-signing-key-public.asc
    apt-key add rabbitmq-signing-key-public.asc

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apiVersion: v1
kind: ConfigMap
metadata:
  name: rabbitmq-config
  namespace: default
data:
  enabled_plugins: |
      [
        rabbitmq_management,  
        rabbitmq_peer_discovery_k8s,

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#!/bin/sh
#
# This script deploys the given manifest,
# tracks the deployment, and rolls back on failure.
#
# First execute this with "myapp.yaml" and then try it with "myapp.failing.yaml"
#

MANIFEST_PATH=$1
DEPLOYMENT_NAME=myapp

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# -*- mode: ruby -*-
# vi: set ft=ruby :

# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
  # All Vagrant configuration is done here. The most common configuration
  # options are documented and commented below. For a complete reference,
  # please see the online documentation at vagrantup.com.