initial commit

1_introduction.txt

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+what is ansible?
+it is automation tool, whwre we can automate all repetitive process.
+
+Ansible Inventory:
+A list of managed nodes provided by one or more ‘inventory sources’. Your inventory can specify information specific to each node, like IP address.
+
+Ansible Playbooks:
+Ansible Playbooks are lists of tasks that automatically execute against hosts.
+
+Ansible Modules :
+various kind of command, which we can execute on rmemote system for desired output.
+ansible module which contain on -> docs.ansible.com 
+
+Ansible Variables:
+variable is that may assume any one of a set of values, if you want to use file multiple time, then create a variable named as file, so whenever u want
+to use this file at that time u can give, variable name so it will get the data from variable property.
+
+Ansible Conditionals:
+we can give conditions, once it met condition, it will do the appropriate action on it.  
+
+Ansible Loops :
+ansible can execute multiple times. example- 1 to 10
+
+Ansible Roles:
+you can easily reuse them and share them with other users.
+
+how to find syntax for ansible?
+docs.ansible.com
+example for ansible automation? automatic turn on and turn off, configuraion, install apahe, patching..!
+
+use case of ansible:
+--------------------
+provisoning
+configuration management
+continous delivery
+application deployment
+security compliance
+
+
+

2_installation.txt

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+doc refer:
+----------
+https://docs.ansible.com/ansible/latest/installation_guide/installation_distros.html#installing-ansible-on-fedora-or-centos
+
+important
+----------
+ansible only we can install linux based os, we cannot use anible on windows as master system, although we can manage windows
+instance. 
+
+fedrora, centos, amazon linux, linux:
+--------------------------------------
+install epel repo
+------------------
+amazon linux:- amazon-linux-extras install install epel
+fedora, centos, rhel:- yum install epel
+
+install ansible
+---------------
+yum install ansible

3_inventory parameter.txt

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+ansible_ssh_user(ansible_user) - username through ssh
+ansible_ssh_pass - passowrd through ssh
+ansible_private_key_file - private key file name
+ansible_user - username
+ansible_connection - ssh/winrm/localhost
+ansible_host - hostname
+ansible_port - which port want to connect
+

3_remote system configuration.txt

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+1) create pasword for remote system
+2) suppress host key checking:-
+goto ansible.cf file and search for host key checking and uncomment it
+3) with password authentication:-
+goto ansible host file add following line
+
+method one by using password:
+-----------------------------
+ip_address/hostname ansible_ssh_user=username ansible_ssh_pass=password
+
+command for check ping 
+## ansible all -m ping 
+
+method two by using ssh key:
+----------------------------
+ip_address/hostname ansible_ssh_user=ec2-user ansible_private_key_file=key_destination
+
+command for check ping 
+## ansible all -m ping 
+
+method three by using password less authentication:
+---------------------------------------------------
+ip_address/hostname ansible_ssh_user=username
+
+command for check ping 
+## ansible all -m ping 
+---------------------------------------------------------------------------------------------------------
+how to create sepperate inventory file:-
+-----------------------------------------
+we can create sepperate inventory file as well..!
+
+create file "any_custom_name" example: targets
+
+use the same synatx (take any one):
+-----------------------------------
+ip_address/hostname ansible_ssh_user=ec2-user ansible_private_key_file=key_destination (password auth)
+ip_address/hostname ansible_ssh_user=username ansible_ssh_pass=password (ssh key auth)
+ip_address/hostname ansible_ssh_user=username (password less auth)
+
+try to ping with cited command:
+ansible groupname/target_name -m ping -i inventory_file_name
+
+ansible command
+----------------
+ansible all/host -m ping 
+ansible-playbook playbook_name
+

4_learn yaml.txt

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+ansible use yaml to configure (yet another markup language)
+
+key/value pair:
+--------------
+name: apple
+color: red
+place: kashmir
+(keep to leave small space in bewteen fullcoln and value)
+
+array/list:
+-----------
+fruits:
+-  orange
+-  apple
+-  grapes
+
+veg:
+-  tomato
+-  carrot
+- cauliflower
+
+dictionary
+----------
+banana:
+  calory: 100g
+  fat: 0.4g
+  carbs: 27g
+
+grapes:
+  calory: 120g
+  fat:  0.6g
+  carbs: 110g
+
+
+example;
+--------
+fruits:
+  - banana:
+      calories: 105
+      fat: 0.4g
+      carbs: 27g
+  - grapes:
+      calories: 105
+      fat: 0.4g
+      carbs: 27g
+
+

5_system shutdown.txt

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+to create dierctory
+-------------------
+to shutdown vm
+---------------
+- name: this is ansible automation
+  become: true
+  hosts: all
+  tasks:
+    - name: shutdown hosts
+      command: mkdir /mydir
+-----------------------------------------------------------------------------------------------------
+to shutdown vm
+---------------
+- name: this is ansible automation
+  become: true
+  hosts: all
+  tasks:
+    - name: shutdown hosts
+      command: /sbin/shutdown -h now
+----------------------------------------
+- name: tets
+  hosts: all
+  become: yes
+  tasks:
+  - name: shutdown hosts
+    command: /sbin/shutdown -h now
+---------------------------------------------------------------------------------------------------------

6_a_module.txt

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+module types
+------------
+command
+--------
+- command
+- expect
+- raw
+- script
+- shell
+
+database
+--------
+- mongoDB
+- mssql
+- mysql
+- postgresql
+- proxysql
+- vertica
+
+windows
+-------
+- win_copy
+- win_command
+- win_file
+- win_msg
+- win_service
+system
+-------
+- user
+- group
+- hostname
+- iptables
+- lvg
+- lvol
+- make
+- mount
+- ping
+- timezone
+-systemd
+-service
+
+files
+------
+- acl
+- archive
+- copy
+- file
+- find
+- lineinfile
+- replace
+- stat
+- template
+- unarchive
+
+cloud
+-----
+- amazon
+- azure
+- gcp
+- vmware
+- digital ocean
+
+more
+-----

6_b_module_example.txt

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+refer- https://docs.ansible.com/ansible/2.5/modules/command_module.html#command-module
+create directory by using command/shell module:
+-----------------------------------------
+- name: automation
+  hosts: all
+  become: true
+  tasks:
+    - name: execute directory
+      command: mkdir /home/newDir
+
+
+refer: https://docs.ansible.com/ansible/latest/collections/community/general/apache2_module_module.html
+--------------------------------------------------------------------------------
+install webserver by using httpd module
+---------------------------------------
+- name: installing apache by usign httpd
+  hosts: all
+  become: true
+  tasks:
+    - name: (httpd module)
+      yum:
+        name: httpd
+        state: present
+    - name: (service module)
+      service:
+        name: httpd
+        state: present
+
+copy shell script from master to node by usign script module
+------------------------------------------------------------
+- name: copy code from master to node
+  hosts: all
+  become: root
+  tasks:
+  - name: copy
+    script: /file/path/script.sh
+
+[example-2]
+------------
+- name: playbok for automate script
+  hosts: all
+  become: root
+  tasks:
+  - name: copy from master to node
+    script: /etc/ansible/script.sh
+
+[shell script]
+--------------
+#!/bin/bash
+sudo yum install httpd -y
+sudo systemctl start httpd.service
+sudo wget -P /var/www/html https://www.free-css.com/assets/files/free-css-templates/download/page284/pet-shop.zip
+sudo unzip -o /var/www/html/pet-shop.zip -d /var/www/html/
+sudo cp -rf /var/www/html/pet-shop-website-template/* /var/www/html/
+
+wget -P for purticulr directory
+unzip -o from overwrite
+unzip -d for save in purticular directory
+
+
+lineinfile module add a line in file
+------------------------------------
+- name: installing apache by usign httpd
+  hosts: all
+  become: true
+  tasks:
+  - name: add line in resolv file
+    lineinfile:
+      path: /etc/resolv.conf
+      line: nameserver 192.168.1.1

6_c_important_commands.txt

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+1 ansible [hostname] -m ping 
+
+2 ansible-playbook play_book_name
+
+3 --check (not going to execute but i will give idea about plays, can understand the chnages in upcming script)
+
+4 -vvv , -vvvv (use for connection debugging)
+
+5 --version (to check version of ansible)
+
+6 --list-hosts  (outputs a list of matching hosts; does not execute anything else)
+
+7 --syntax-check (to check syntax)
+
+8 --diff (not going to execute but i will give idea about plays, can understand the chnages in upcming script)
+

7_variables.txt

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+variable
+--------
+component of ansible, where we can store values and we can use with global scop.
+
+we can create sepparte 'variable file' or we can create 'vars' in inside playbook
+
+example: variable in same file
+- hosts: all
+  name: play
+  become: true
+  vars: 
+    var1: var1
+    var2: reshma
+  tasks:
+  - name: first task
+    lineinfile:
+      path: /etc/resolv.conf
+      line: '{{var1}}'
+
+-------------------------------------------------------------------
+mention variable in different file
+----------------------------------
+create one more file var.yml
+
+goto playbook add path of 'vars_file: /etc/ansible/var.yml'
+
+- hosts: all
+  name: play
+  become: true
+  vars_files: /etc/ansible/var.yml
+  tasks:
+  - name: first task
+    lineinfile:
+      path: /etc/resolv.conf
+      line: '{{var1}}'