mgpradeepa mgpradeepa

Create Cloud Infra, maintain, monitor. Also create virtual env for Apps to execute.

For Devops one of the primary focus is to manage the deployment environments. However with so much of varieties devops needs a way to ease it out. Devops team has more responsibility to create and monitor the entire Cloud infra and also create env for the applications to run.

We observe Terraform and Helm are two such ways technologies available to get utilized from. Terraform helps the engineer to direct the need by using HCL files instead of obtaining each cloud components to get the setup done. Terraform needs the requirement of the cloud to be clear and direct it usig HCL (Hashicorp Configuration Language). However Terraform depends on many thirdparty plugins for enabling the cloud infra

HELM

/boot folder gets filled up as and when upgrades are done. How to free it up

Lets check by auto remove

sudo apt autoremove If the above does not remove old ones lets first check the current kernel thats being used

uname -r

Lists the current used kernel version. Lets remove the earlier versions of the kernel upgrades

Apache kafka

Platform for real-time distributed streaming which just behaves like any other MESSAGING system

Design goals

Scalability
High Volume
Data Transformations
Low Latency
Fault Tolerant

Spring Integration framework.

Mainly focusses on the Enterprise Integration Application Framework. Design patterns are obtained and utilized as a integration solution from those.

One of the component is Message

Message is a generic wrapper for a java object combined with the metadata used by the framework. Payload & Headers are the key components of a message. Payload:- Can be of anything and any type data. Headers:-
Holds commonly required information like id, time_stamp, correlation_id and return address.

	In WINDOWS machines use the following steps

	Start putty gen tool in windows
	Look at ACTIONS section and choose "Load" button
	Browse through the folders to pull the ppk file fo which you need to create a pem file
	Key passphrase is optional and cick YES to ignore
	From the menu , choose Conversions --> Drop down --> Export OpenSSH Key.
	Just say 'Yes' for warning of not entering passphrase
	Save the file as <xyz>.pem

	The docker system in which docker is installed or running can run into dangling state.

	To check whats the disk consumption due to Docker
	docker system df

	Primarily the issues comes up is with low disk space. Of course this is re-claimable.

	Cause for Low disk space are
	(a) docker images created during build could be in dangling state
	or would have been stored or persisted for a longer time.

	Single responsibility to single method
	No more than 10 lines of code in a method.

	when ever you see extract it right away
	have your code comments on the way

	use shortcuts on your side
	IntelliJ is the best ide to slide

	move the responsibility to the classes of its own

	#!/bin/bash

	#script extraido de: http://paulocassiano.wordpress.com/2008/08/29/deixando-o-gedit-com-a-cara-do-textmate/
	#tip for better "resolution" here: http://blog.siverti.com.br/2008/05/22/fonte-monaco-no-ubuntugedit/

	cd /usr/share/fonts/truetype/

	#TODO: put validation if folder already exists
	sudo mkdir ttf-monaco

	OS: Centos
	Requisite: JAVA 7+8

	sudo vi /etc/profile
	export JAVA_HOME=/usr/lib/jvm/jre-1.8.0-openjdk
	export JRE_HOME=/usr/lib/jvm/jre

	Download Kafka from any of the given website: the one use here is kafka_2.11-0.10.1.1.tgz
	Untar: tar -xvf kafka_2.11-0.10.1.1.tgz
	sudo mv kafka_2.11-0.10.1.1.tgz /opt

	Create user
	Login as root
	$ sudo su -
	$ useradd -m <userName> -p <password>

	Add to the group
	$ usermod -aG <someGroup> <userName>

	For granting sudo or root access
	visudo