Example – 1 For CENTOS / RHEL

---
- name: Update web servers
  hosts: web
  vars:
    myname: "Rajesh Kumar"

  tasks:
  - name: Install Apache in centos7
    ansible.builtin.yum:
      name: httpd
      state: latest
    when: ( ansible_os_family == "RedHat" and ansible_system == "Linux")
  - name: Copy index.html
    ansible.builtin.copy:
      src: index.html
      dest: /var/www/html/index.html
  - name: Starting a Apache Server
    ansible.builtin.service:
      name: httpd
      state: started
    when: 
      - ansible_os_family == "RedHat"
      - ansible_distribution_major_version == "7"
      - ansible_system == "Linux"
  - name: My Name is Equals to Rajesh Kumar
    debug:
      msg: "My Name is Equals to Rajesh Kumar"
    when: myname == "Rajesh Kumar"
  - name: Ansible print when ubuntu
    debug:
      msg: "I am ubuntu"
    when: ansible_os_family == "Debian"
  - name: My Name is not Equals to Rajesh Kumar
    debug:
      msg: "My Name is not Equals to Rajesh Kumar"
    when: myname != "Rajesh Kumar"

	---
	- name: Update web servers
	hosts: web
	vars:
	myname: "Rajesh Kumar"
	tasks:
	- name: Install Apache in centos7
	ansible.builtin.yum:
	name: httpd
	state: latest
	when: ( ansible_os_family == "RedHat" and ansible_system == "Linux")
	- name: Copy index.html
	ansible.builtin.copy:
	src: index.html
	dest: /var/www/html/index.html
	- name: Starting a Apache Server
	ansible.builtin.service:
	name: httpd
	state: started
	when:
	- ansible_os_family == "RedHat"
	- ansible_distribution_major_version == "7"
	- ansible_system == "Linux"
	- name: My Name is Equals to Rajesh Kumar
	debug:
	msg: "My Name is Equals to Rajesh Kumar"
	when: myname == "Rajesh Kumar"
	- name: Ansible print when ubuntu
	debug:
	msg: "I am ubuntu"
	when: ansible_os_family == "Debian"
	- name: My Name is not Equals to Rajesh Kumar
	debug:
	msg: "My Name is not Equals to Rajesh Kumar"
	when: myname != "Rajesh Kumar"

view raw Example1.yaml hosted with by GitHub

	# We can also check if a variable is empty using similar manner.
	- hosts: all
	tasks:
	- shell: cat /etc/temp.txt
	register: output
	- name: Ansible when variable is empty example
	debug:
	msg: "empty"
	when: output.stdout == ""

view raw Example10.yaml hosted with by GitHub

	---
	# this is a demo of conditional executions using 'when' statements, which can skip
	# certain tasks on machines/platforms/etc where they do not apply.
	- hosts: all
	remote_user: root
	vars:
	favcolor: "red"
	dog: "fido"
	cat: "whiskers"
	ssn: 8675309
	tasks:
	- name: "do this if my favcolor is blue, and my dog is named fido"
	shell: /bin/false
	when: favcolor == 'blue' and dog == 'fido'
	- name: "do this if my favcolor is not blue, and my dog is named fido"
	shell: /bin/true
	when: favcolor != 'blue' and dog == 'fido'
	- name: "do this if my SSN is over 9000"
	shell: /bin/true
	when: ssn > 9000
	- name: "do this if I have one of these SSNs"
	shell: /bin/true
	when: ssn in [ 8675309, 8675310, 8675311 ]
	- name: "do this if a variable named hippo is NOT defined"
	shell: /bin/true
	when: hippo is not defined
	- name: "do this if a variable named hippo is defined"
	shell: /bin/true
	when: hippo is defined

view raw Example11.yaml hosted with by GitHub

	# note that Ansible facts and vars like ansible_os_family can be used
	# directly in conditionals without double curly braces
	tasks:
	- name: "shut down Debian flavored systems"
	command: /sbin/shutdown -t now
	when: ansible_os_family == "Debian"

view raw Example2.yaml hosted with by GitHub

	# You can also use parentheses to group conditions:
	tasks:
	- name: "shut down CentOS 6 and Debian 7 systems"
	command: /sbin/shutdown -t now
	when: (ansible_distribution == "CentOS" and ansible_distribution_major_version == "6") or
	(ansible_distribution == "Debian" and ansible_distribution_major_version == "7")

view raw Example3.yaml hosted with by GitHub

	# Multiple conditions that all need to be true (a logical �and�) can also be specified as a list:
	tasks:
	- name: "shut down CentOS 6 systems"
	command: touch /opt/verizon.txt
	when:
	- ansible_distribution == "RedHat"
	- ansible_distribution_major_version == "7.5"

view raw Example4.yaml hosted with by GitHub

	#If a required variable has not been set, you can skip or fail using Jinja2�s defined test. For example:
	tasks:
	- shell: echo "I've got '{{ foo }}' and am not afraid to use it!"
	when: foo is defined
	- fail: msg="Bailing out. this play requires 'bar'"
	when: bar is undefined

view raw Example5.yaml hosted with by GitHub

	# Following is the simplest example of checking whether the value of a variable. We have created a variable test1 and checking if the value is �Hello World� using the when statement.
	- hosts: all
	vars:
	test1: "Hello World"
	tasks:
	- name: Ansible when variable equals example
	debug:
	msg: "Equals"
	when: test1 == "Hello World"

view raw Example6.yaml hosted with by GitHub

	# We can also set the reverse, i.e. if the variable is not equal to another value.
	- hosts: all
	vars:
	test1: "Bye World"
	tasks:
	- name: Ansible when variable not equals example
	debug:
	msg: "Not Equals"
	when: test1 != "Hello World"

view raw Example7.yaml hosted with by GitHub

	# We can also make a conditional statement based on whether the variable contains a particular string.
	- hosts: all
	vars:
	test1: "Bye World"
	tasks:
	- name: Ansible when variable contains string example example
	debug:
	msg: "Equals"
	when: test1.find("World") != -1

view raw Example8.yaml hosted with by GitHub

	#If the variable value is registered from a shell command you may have to use stdout.find to check the content.
	- hosts: all
	tasks:
	- shell: cat /etc/temp.txt
	register: output
	- name: Ansible when variable contains string example example
	debug:
	msg: "Equals"
	when: output.stdout.find("World") != -1

view raw Example9.yaml hosted with by GitHub

Example – 1 For Ubuntu

- name: Update web servers
  hosts: web
  vars:
    myname: "Rajesh Kumar"

  tasks:
  - name: Install Apache in ubuntu
    ansible.builtin.apt:
      name: apache2
      state: latest
    when: ( ansible_os_family == "Debian" and ansible_system == "Linux")
  - name: Copy index.html
    ansible.builtin.copy:
      src: index.html
      dest: /var/www/html/index.html
  - name: Starting a Apache Server
    ansible.builtin.service:
      name: apache2
      state: started
    when: 
      - ansible_os_family == "Debian"
      - ansible_distribution_major_version == "20"
      - ansible_system == "Linux"
  - name: My Name is Equals to Rajesh Kumar
    debug:
      msg: "My Name is Equals to Rajesh Kumar"
    when: myname == "Rajesh Kumar"
  - name: Ansible print when ubuntu
    debug:
      msg: "I am ubuntu"
    when: ansible_os_family == "Debian"
  - name: My Name is not Equals to Rajesh Kumar
    debug:
      msg: "My Name is not Equals to Rajesh Kumar"
    when: myname != "Rajesh Kumar"

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Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 1

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 2

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 3

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 4

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 5

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 6

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 7

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 8

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 9

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 10

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 11

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 12

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 13

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 14

Beginner to Advanced Complete Ansible Tutorial in 15 hours 6-2021 Part – 15

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Rajesh Kumar

I’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I am working at Cotocus. I blog tech insights at DevOps School, travel stories at Holiday Landmark, stock market tips at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at I reviewed , and SEO strategies at Wizbrand. 

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