9.Loops.yml

--- # ------------------------------
# The playbook currently runs an echo command to print a fruit name.
# Apply a loop directive (with_items) to the task to print all fruits defined in the "fruits" variable.

# ------------------------------
#           BEFORE
# ------------------------------
#  name: Print list of fruits
#-
#  hosts: localhost
#  vars:
#    fruits:
#      - Apple
#      - Banana
#      - Grapes
#      - Orange
#  tasks:
#    -
#      command: echo "Apple"#
# ------------------------------
#           AFTER

- hosts: localhost
  vars:
    fruits:
      - Apple
      - Banana
      - Grapes
      - Orange
  tasks:
    - command: echo "{{ item }}"
      with_items: "{{fruits}}"

# To a more realistic use case. We are attempting to install multiple packages using yum module.
# The current playbook installs only a single package.

# ------------------------------
#           BEFORE
# ------------------------------
#-
#  name: Install required packages
#  hosts: localhost
#  packages:
#      -	httpd
#      -	binutils
#      -	glibc
#      -	ksh
#      -	libaio
#      -	libXext
#      -	gcc
#      -	make
#      -	sysstat
#      -	unixODBC
#      -	mongodb
#      -	nodejs
#      -	grunt
#
#  tasks:
#    -
#      yum: name=httpd state=present
# ------------------------------
#           AFTER
# ------------------------------
- name: Install required packages
  hosts: localhost
  vars:
    packages:
      - httpd
      - binutils
      - glibc
      - ksh
      - libaio
      - libXext
      - gcc
      - make
      - sysstat
      - unixODBC
      - mongodb
      - nodejs
      - grunt

  tasks:
    - yum: name="{{ item }}" state=present
      with_items: "{{ packages }}"