monikagm – Best DevOps

Ansible Variable Lab & Excercise – Part 2

monikagm — Mon, 06 Sep 2021 11:00:46 +0000



- name: This sets up an httpd webserver
  hosts: localhost
  vars_files:
    - vars-file.yaml

  tasks:
  - name: Install the httpd apps
    yum:
      name={{ servicename }}
      state=latest
  - name: 
    ansible.builtin.service:
      name={{ servicename }}
      state=started



servicename: httpd
2.Assigment 2 – Create a playbook and setup a webserver(httpd) and use httpd as a variable decalared using prompt



- name: This sets up an httpd webserver
  hosts: localhost
  vars_prompt:
    - name: "servicename"
      prompt: "Enter service name"
      private: false

  tasks:
  - name: Install the httpd apps
    yum:
      name={{ servicename }}
      state=latest
  - name: 
    ansible.builtin.service:
      name={{ servicename }}
      state=started
  - name: Print the vars
    ansible.builtin.debug:
      msg: Service name {{ servicename }}



Assigment 3 – Create a playbook and setup a webserver(httpd) and find a list of .txt file in some directory and output using register variables



- name: This sets up an httpd webserver
  hosts: localhost
  vars_prompt:
    - name: "servicename"
      prompt: "Enter service name"
      private: false

  tasks:
  - name: Install the httpd apps
    yum:
      name={{ servicename }}
      state=latest
  - name: 
    ansible.builtin.service:
      name={{ servicename }}
      state=started
  - name: Print the vars
    ansible.builtin.debug:
      msg: Service name {{ servicename }}
  - name: 
    shell: "find *.txt"
    args:
      chdir: "/home/centos/ansible/monika"
      register: find_output
Assigment 4 – Create a playbook and setup a webserver(httpd), copy a index.html and interpolate variables in template file decalared in playbook.




- name: This sets up an httpd webserver
  hosts: localhost
  vars_prompt:
    - name: "servicename"
      prompt: "Enter service name"
      private: false

  tasks:
  - name: Install the httpd apps
    yum:
      name={{ servicename }}
      state=latest
  - name: 
    ansible.builtin.service:
      name={{ servicename }}
      state=started
  - name: Print the vars
    ansible.builtin.debug:
      msg: Service name {{ servicename }}
  - name: copy index.html
    ansible.builtin.template:
     src: index.html.j2
     dest: /var/www/html/
 -  name: Start service httpd, if not started
    ansible.builtin.service:
     name: "{{servicenamename}}"
     state: started

Ansible Variable example

monikagm — Mon, 06 Sep 2021 10:38:22 +0000

Declare variables with vars:

- name: To create group deploy
  hosts: web
  vars:
    groupname: deploy    
    firstname: Monika
    lastname: GM

  tasks:
  - name: to create group deploy
    ansible.builtin.group:
      name={{ groupname }}
      state=present

Declare variables in external file:

- name: To create group deploy
  hosts: web
  vars_files:
    - vars-file.yaml

  tasks:
  - name: to create group deploy
    ansible.builtin.group:
      name={{ groupname }}
      state=present

vars-file.yaml
groupname: deploy    
firstname: Monika
lastname: GM

Declare variables in include file:

- name: To create group deploy
  hosts: web
  vars_files:
    - vars-file.yaml

  tasks:
  - name: to create group deploy
    ansible.builtin.group:
      name={{ groupname }}
      state=present
  - name: include default step variables
    include_vars: var-include.yml
  - name: Print the variable value
    ansible.builtin.debug:
      msg: welcome {{ firstname }} {{ lastname }}

vars-file.yaml
groupname: deploy    
firstname: Monika
lastname: GM

* scope is higher if you define in include file
* value of variable will be value defined in include file

Declare variables using prompt:

- name: To create group deploy
  hosts: web
  vars_files:
    - vars-file.yaml
  vars_prompt:
    - name: "myname"
      prompt: "enter your name?"
      private: false

  tasks:
  - name: to create group deploy
    ansible.builtin.group:
      name={{ groupname }}
      state=present
  - name: include default step variables
    include_vars: var-include.yml
  - name: Print the vars
    ansible.builtin.debug:
      msg: Enter your name{{ myname }}

vars-file.yaml
groupname: deploy    
firstname: Monika
lastname: GM

* scope is higher if you pass from prompt

Declare variables command line	:
cmd: ansible-playbook -i inventory creategroup.yaml -e firstname=monika -e lastname=gm



- name: To create group deploy
  hosts: web
  vars_files:
    - vars-file.yaml
  vars_prompt:
    - name: "myname"
      prompt: "enter your name?"
      private: false

  tasks:
  - name: to create group deploy
    ansible.builtin.group:
      name={{ groupname }}
      state=present
  - name: include default step variables
    include_vars: var-include.yml
  - name: Print the vars
    ansible.builtin.debug:
      msg: Enter your name{{ myname }}

vars-file.yaml
groupname: deploy    
firstname: Monika
lastname: GM

tasks that can be done using Ansible ad-hoc commands

monikagm — Mon, 06 Sep 2021 10:35:49 +0000

To archive or Zip files and folders || Achieve module
To ping Remote host || ping module
To install packages || yum module
To manage cron job or schedule job ||cron
To reboot remote machine||reboot
To verify service status|| service
To download a file from URL || get_url module
To check uptime of host || command or shell module
To copy file content to another file||copy
To delete whole directory and files||file module
To create directory ||file module
To verify all pre-requisite packages or installed || yum module

Ansible Playbook Lab & Excercise – Part 2

monikagm — Mon, 06 Sep 2021 05:42:29 +0000

#first.yaml
- name: To create group deploy
  hosts: web

  tasks:
  - name: to create group deploy
    group:
      name: deploy
      state: present



#second.yaml
---
- name: To create group deploy which is part of deploy
  hosts: web

  tasks:
  - name: to create group deploy which is part of deploy
    user:
      name: deploy-user
      group: deploy
      state: present

#third.yaml
 ---
- name: to install package
  hosts: web

  tasks:
  - name: to install package
    yum:
      name: httpd
      state: present



#fourth.yaml
---
- name: to start and enable the service
  hosts: web

  tasks:
  - name: to start and enable the service
    service:
      name: httpd


#fifth.yaml
     
---
- name: create a file
  hosts: web

  tasks:
  - name: create a file
   file:
    path: /var/www/html
    state: file

#sixth.yaml
---
- name:  to reboot a self machine
  hosts: web

  tasks:
  - name:  to reboot a self machine
   reboot:
    reboot_timeout: 3600
   
---
- name: to install a package
  hosts: web

  tasks:
  - name: to install a package
   yum:
      name: git
      state: present

---
- name: to clone git repo
  hosts: web

  tasks:
  - name: to clone git repo
   git:
      dest: /home/centos/monika
      repo: "https://github.com/scmgalaxy/ansible-role-template"

monikagm — Sat, 04 Sep 2021 11:31:57 +0000

1 new message

# To create Deplo group
ansible localhost -m ansible.builtin.group -a"name=deploy state=present" -b
#To create User in deploy group
ansible localhost -m user -a"name=deploy-user password=welcome123 groups=deploy state=present shell=/bin/bash" -b
#Install httpd
ansible localhost -m yum -a"state=present name=httpd" -b
#start and enable the service named “httpd”
ansible localhost -m service -a"name=httpd state=started" -b
# create a file called “index.html” in /var/www/html with some dummy html contents.
ansible localhost -m copy -a"dest=/var/www/html src=index.html" -b

# “second.html” in /var/www/html/second.html with some dummy html contents.
ansible localhost -m copy -a"dest=/var/www/html src=second.html" -b

#install a package called “git”, “wget”
ansible localhost -m yum -a"state=present name=git" -b
ansible localhost -m yum -a"state=present name=wget" -b

#to clone git repo. https://github.com/scmgalaxy/ansible-role-template.
ansible localhost -m ansible.builtin.git -a"repo=https://github.com/scmgalaxy/ansible-role-template dest=/home/centos/monika" -b

#Restart machine
ansible localhost -m reboot

#Ansible commands to touch a file called “devopsschool.txt” in /opt/ and delete after using ansible adhoc command.
ansible localhost -m file -a"name=devopesschool.txt state=touch creates=/opt" -b
ansible localhost -m file -a"name=devopesschool.txt state=absent creates=/opt" -b