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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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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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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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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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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