AnsibleNotes_LMS.txt

Ansible Notes

Create 2 instances and start them
    give them instance names to have
        *ansible-controller-machine* & 
        *ansible-host-machine*

Set up on ACM:
********************************

Step1: 
**************
go to vim /etc/ssh/sshd_config

	i
scroll down
remove the # for  password Authentication Yes
Add # for 	  password Authentication No

:wq!

Step 2:
**************
Create password for ec2-user

# passwd ec2-user
Newpassword:
ConfirmPassword:

********************
Step 3:
***********

Add ec2-user in sudoers files and give all permission

# vim /etc/sudoers

i
scroll down

under root add like this

ec2-user ALL=NOPASSWD: ALL

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Step 4:

Restart your sshd connection

# systemctl restart sshd

*******************

Repeat all the 4 steps on Host machine also and restart the sshd connection on host machine.

************************

Install Ansible on *ansible-controller-machine* ONLY:

Step 1:
*************

# yum list | grep ansible  // you will not find ansible package as default in yum

So install epel replositories and it will ass ansible to yum repository


	# yum install epel-release

// copy the command sudo amazon-linux-extras install epel and execute it

	# sudo amazon-linux-extras install epel

give y

Complete!

You will ansible package is now available with yum

	# yum list | grep ansible

//ansible will be available (wait for few seconds)


	# yum install ansible

press y
again press y
Complete!

	# ansible --version

version of ansible isntalled will be displayed.

*****************************************
CREATE INVENTORY ON ACM and ADD Host details
*****************************************

# vim /etc/ansible/hosts

Scroll down to end and add

[webservers]
paste private ip of host ==> 172.31.39.169
 (may have to use the 'Private IP DNS name (IPv4 only)' instead)

:wq!

***********************************************

OPEN SECURE SHELL CONNECTION 

***********************************************

Step 1: change to ec2-user

	# su - ec2-user

	# ssh-keygen

press enter
press enter
press enter

ssh key will be generated

Step 2: copy key on to the host

	# ssh-copy-id -i ec2-user@private ip of host  
        (may have to use the 'Private IP DNS name (IPv4 only)' instead)  

press yes
enter passowrd ==>

ssh connection will be done
In the message we will have a command to log into the host from ACM, execute it

	# ssh 'ec2-user@172.31.35.169'
    (may have to use the 'Private IP DNS name (IPv4 only)' instead)

we will be connected to the host

exit
back to ACM

*****************************************
Modules in ANSIBLE

1. adhoc ping command

# ansible -m ping webservers

response will be a pong from all hosts under webservers


Module2 : command

# ansible -m command -a "uptime" webservers

will give the uptime of hosts in webservers


To check all modules in ansible

# ansible-doc -l

use up arrow key and down arrow key to scroll up and down.
press q to exit
********************************

Playbook2 -- For TomCat

# sudo vim playbook2.yml

i

---
- hosts: webservers
  become: true
  become_user: root
  tasks:
  - name: install tomcat
    yum: name=tomcat state=present
  - name: start tomcat
    service: name=tomcat state=started
  - name: deploy war file
    get_url:
     url=https://tomcat.apache.org/tomcat-7.0-doc/appdev/sample/sample.war
     dest=/usr/share/tomcat/webapps
    notify: restart tomcat
  handlers:
   - name: restart tomcat
     service: name=tomcat state=restarted

Syntax check:

# ansible-playbook playbook2.yml --syntax-check

# ansible-playbook playbook2.yml

********************************************

playbook.yml (httpd) and deploy a html page

# sudo vim playbook.yml

i

---
- hosts: webservers
  become: true
  become_user: root
  tasks:
  - name: install httpd
    yum: name=httpd state=present
  - name: start httpd
    service: name=httpd state=started
  - name: deploy html file
    copy: src=/etc/ansible/index.html dest=/var/www/html
    notify: restart httpd
  handlers:
  - name: restart httpd
    service: name=httpd state=restarted

:wq!

Create file:
    /etc/ansible/index.html

Check syntax

	# ansible-playbook playbook.yml --syntax-check
Now run the playbook

	# ansible-playbook playbook.yml


*************************************

docker deployment

---
- hosts: webservers
  become: true
  become_user: root
  tasks:
  - name: install docker
    yum: name=docker state=present
  - name: start docker
    service: name=docker state=started
  - name: install git
    yum: name=git state=present
  - name: get the dockerfile from githib
    git: repo=https://github.com/Sonal0409/dockerdemo.git dest=/tmp/gitrepo
  - name: build dockerfile
    command: chdir=/tmp/gitrepo docker build -t deployimage:ansible .
  - name: run the dockerfile
    command: docker run -itd -P deployimage:ansible

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