Constants in Groovy

final static makes it a constant

final makes instance variable constant

https://www.jdoodle.com/a/4ZGt

Class in Groovy - No Globals Allowed - You gotta use "def"

 In class , We cannot use Global declarations inside method in class

We have to use "def" local variables

https://www.jdoodle.com/a/4ZGo   Refer this for an example

Multiple Named Parameters Behave Like a MAP in groovy

https://gist.github.com/karankaw/ffde58e489c881893a84155cdddd5877

Groovy - Useful - Tips and Links

https://groovy-lang.org/processing-xml.html

def response = new XmlSlurper().parseText(books)

def titles = response.'**'.findAll { node -> node.name() == 'title' }*.text()

assert titles.size() == 4

http://docs.groovy-lang.org/latest/html/api/groovy/util/Eval.html

https://stackoverflow.com/questions/8243593/groovy-use-xmlslurper-with-a-dynamic-path/8243708#8243708

https://stackoverflow.com/questions/48913228/how-to-use-gpath-with-variable/48914505#48914505

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https://www.baeldung.com/groovy-strings

https://dzone.com/articles/concatenate-strings-in-groovy

https://www.tutorialspoint.com/groovy/groovy_methods.htm

https://www.geeksforgeeks.org/tee-command-linux-example/

https://www.baeldung.com/groovy/variable-scope

https://stackoverflow.com/questions/54315868/how-to-set-the-body-of-an-http-request-to-the-contents-of-a-file

https://www.jdoodle.com/execute-groovy-online/

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https://plugins.jenkins.io/http_request/

Status of last command - Bash

 echo $0

https://linuxhint.com/bash-exit-code-of-last-command

Ansible Tutorial -Walkthrough

 =====================================================================

https://stackoverflow.com/questions/2953081/how-can-i-write-a-heredoc-to-a-file-in-bash-script

https://www.tecmint.com/use-heredoc-in-shell-scripting/

cat << EOF > Filename.txt

---

---

---

EOF

tee abc.txt << EOF

- name: Testing Ansible

  hosts: localhost

  tasks:

  - name: Echo Message

    debug: msg="Ansible is working"

=====================================================================

https://stackoverflow.com/questions/64723019/what-is-difference-between-running-the-commands-ansible-and-ansible-playbook/64723156#64723156

Ansible scripts are called playbooks.

By definition

A playbook is a list of plays. A play is minimally a mapping between a set of hosts selected by a host specifier (usually chosen by groups but sometimes by hostname globs) and the tasks which run on those hosts to define the role that those systems will perform. There can be one or many plays in a playbook.

https://docs.ansible.com/ansible/latest/reference_appendices/glossary.html#term-plays

Then, you execute your playbooks with the command ansible-playbook, for example this command execute the playbook test.yml on all servers in your inventory file:

ansible-playbook test.yml -i inventory all

with ansible command you can execute just a tasks against your servers, for example this command execute a task with the module ping on all servers in your inventory file:

ansible -m ping -i inventory all

Then the difference is with ansible-playbook you can execute a playbook with a lot of tasks and with ansible you just can execute a task.

Welcome to ansible world. Red Hat offers an introductory course of ansible you can take it, It'll help you a lot.

https://www.redhat.com/en/services/training/do007-ansible-essentials-simplicity-automation-technical-overview

=====================================================================

https://geekflare.com/ansible-installation-windows/

ansible-playbook TestAnsible1.yml

ansible-playbook TestAnsible1.yml --connection=local

https://www.tutorialworks.com/ansible-run-playbook/#see-an-example-playbook

ansible-playbook -i hosts --extra-vars "person=Dave" site.yml

=====================================================================

Ansible : Install - CYGWIN

 How to install Ansible on Windows? (geekflare.com)

SSM - How to setup Session Manager of Systems Manager AWS

https://www.youtube.com/watch?v=-ASMtZBrx-k - Follow this  - Just 2 Steps 

1) Install Agent on EC2 as per their OS

2) Attach SSMIAMRole to EC2

https://docs.aws.amazon.com/systems-manager/latest/userguide/ssm-agent-get-version.html

yum info amazon-ssm-agent

apt list amazon-ssm-agent

https://docs.aws.amazon.com/systems-manager/latest/userguide/agent-install-ubuntu-64-snap.html

sudo snap list amazon-ssm-agent

snap list

sudo snap services amazon-ssm-agent

============

AWS SSM Session Manager for Shell Access to EC2 Instances | Temporary SSH Credentials | Security

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