Start 2 Instances in AWS:

Note down prive ip and Hostname of Puppetserver

private ip : 172.31.10.193
private hostname: ip-172-31-10-193.us-east-2.compute.internal

Note down prive ip and Hostname of PuppetAgent

private ip: 172.31.9.221
private hostname: ip-172-31-9-221.us-east-2.compute.internal

Start the AWS machines

Open 2 Bash instances
start one for puppet server
start one for puppetAgent

ON PUPPET SERVER
*************************
# sudo su -

# vim /etc/hosts      // open this file and add below details on top of file

Add the private ip and provate hostname of pupperserver first
Add the private ip and private hostname of puppet agent in next line

172.31.10.193 ip-172-31-10-193.us-east-2.compute.internal
172.31.9.221 ip-172-31-9-221.us-east-2.compute.internal

ON PuppetAGent
***********************
Repeat above steps:

# sudo su -

# vim /etc/hosts      // open this file and add below details on top of file

Add the private ip and provate hostname of pupperserver first
Add the private ip and private hostname of puppet agent in next line

172.31.10.193 ip-172-31-10-193.us-east-2.compute.internal
172.31.9.221 ip-172-31-9-221.us-east-2.compute.internal


Go back to PUPPETSERVER  -SETUP
**********************************

1. Download the puppet package 

# rpm -Uvh https://yum.puppetlabs.com/puppet5/puppet5-release-el-7.noarch.rpm

2. Download puppetserver now

# yum install puppetserver -y

3. Add server dns name in this file

# vim /etc/puppetlabs/puppet/puppet.conf

Add master private dns_hostname above vardir and after [master]

dns_alt_names=ip-172-31-10-193.us-east-2.compute.internal

4. Update JAVA_ARGS from 2g to 512m

# vim /etc/sysconfig/puppetserver

Update this line in above file

# Modify this if you'd like to change the memory allocation, enable JMX, etc
JAVA_ARGS="-Xms512m -Xmx512m -Djruby.logger.class=com.puppetlabs.jruby_utils.jruby.Slf4jLogger"

5.restart the system

# exec bash -l

6. Start puppetserver

# systemctl start puppetserver

It will take time start server.. meanwhile setup puppetAgent

***********************************
PuppetAGENT setup

1. download puppet package

# rpm -Uvh https://yum.puppetlabs.com/puppet5/puppet5-release-el-7.noarch.rpm

2. Download puppet package

# yum install puppet -y

3. vim /etc/puppetlabs/puppet/puppet.conf

Add master private hostname of server as given below, at the end of all #

server=ip-172-31-10-193.us-east-2.compute.internal

4. restart bash

# exec bash -l  

Check if puppet Server is started and only then start Agent

5. Start puppet

# systemctl start puppet

Complete set up

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

Check if host and server are connected or not.
Check if host is able to pull the catalogue form server or not.

On Agent machine:

command to pull catalogue is:

# puppet agent --test

it will give message as :
Exiting; no certificate found and waitforcert is disabled

That means, puppetagent has sent the facts to the master but master has not sigend the certificate.
once server/master signs the certificate, agent will be able to pull the catalogue and apply the configurations.

Go to PuppetServer machine to generate certificate and sign the certificate

#  puppet cert list --all

will give list of certificates for all the agents that are connected to the host

the first row has the certificate that for our agent and is not signed

ip-172-31-9-221.us-east-2.compute.internal

Copy it as given above and execute this command

# puppet cert sign ip-172-31-9-221.us-east-2.compute.internal

This will sign the certificate

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

Go to Agent

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

# puppet agent --test

Now catalogue will be applied.

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

Wite puppet code in puppetServer, code is written in declarative scripting language

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

Location for writing puppetcode is:

# cd /etc/puppetlabs/code/environments/production/manifests/

# ls

# vim site.pp

Also get the hostname of agent which will be given as node:
Go to Agent machine:
# hostname
ip-172-31-9-221.us-east-2.compute.internal
*******************


On ServerMachine
#vim site.pp   --code to create file info.txt on agents


node 'ip-172-31-9-221.us-east-2.compute.internal'{
file{'/info.txt':
 ensure => 'present',
 content => "file from server",
}
}

# puppet parser validate site.pp

just validate it, the agent has to pull the catalogue after 30 mins and chnages will be applied
we cannot wait for 30 mins so lets go to agent machien and manually pull the catalogue

On Agent machine:

# puppet agent --test

catalogue will be applied, file will be now on the agent

# cd /
# ls
 info.txt will be there

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

Lets add package and service in the site.pp

again go to site.pp

# vim site.pp

node 'ip-172-31-9-221.us-east-2.compute.internal'{
file{'/info1.txt':
 ensure => 'present',
 content => "file from server",
}
package{'httpd':
 ensure => 'present',
 }
service{'httpd':
 ensure => 'running',
 enable => true,
}
}

go to AGENT machine

# puppet agent --test

catalogue will be applied

httpd-2.4.46-1.amzn2.x86_64  will be there

# rpm -qa httpd

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

lets parametrize the code further

Selector:

# vim site.pp

node 'ip-172-31-9-221.us-east-2.compute.internal'{

class{'linux':
}
}

class linux{

file{'/info1.txt':
 ensure => 'present',
 content => "file from server",
}
package{'httpd':
 ensure => 'present',
 }
service{'httpd':
 ensure => 'running',
 enable => true,
}
}

:wq!

# puppet parser validate site.pp

Go to Agent

# puppet agent --test

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

Add parametrize the package name: SELECTORS

# vim site.pp

$httpdservice=$osfamily?{
'RedHat' => 'httpd',
'Debian' => 'apache2',
default => 'httpd',
}

node 'ip-172-31-9-221.us-east-2.compute.internal'{

class{'linux':
}
}

class linux{

file{'/info1.txt':
 ensure => 'present',
 content => "file from server",
}
package{$httpdservice:
 ensure => 'present',
 }
service{$httpdservice:
 ensure => 'running',
 enable => true,
}
}

:wq!

Agent

# puppet agent --test

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

Array Variables in code:
***********************************

$httpdservice=$osfamily?{
'RedHat' => 'httpd',
'Debian' => 'apache2',
default => 'httpd',
}

node 'ip-172-31-9-221.us-east-2.compute.internal'{

class{'linux':
}
}

class linux{

file{'/info1.txt':
 ensure => 'present',
 content => "file from server",
}

$admintools=['git','nano','screen']
package{$admintools:
 ensure => 'present',
}


package{$httpdservice:
 ensure => 'present',
 }
service{$httpdservice:
 ensure => 'running',
 enable => true,
}
}

:wq!
# puppet parser validate site.pp

Agent

# puppet agent --test

git willbe installed, nano and screen are already there

# git --version
# nano --version
# screen --version

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

MODULES:
*********************

We can write our own module and call it in site.pp

manifests] # cd ..
production] # ls

we have modules

production] # cd modules/
modules] # ls
modules] # puppet module generate sonal-deploy
press enter
press enter
press enter
press enter
press enter
modules] # ls
deploy will be there
modules] # cd deploy/
deploy] # ls
examples  Gemfile  manifests  metadata.json  Rakefile  README.md  spec

all these subdirectories will be there and we are interested in manifests directory

deploy] # cd manifests
# ls
init.pp will be there

mainfests] vim init.pp

remove the comments and add docker package and start docker service

class deploy {

package{'docker':
 ensure => 'present',
}
service{'docker':
 ensure => 'running',
 enable => true,
}

}

manifests] # cd ..
deploy] cd ..
modules] cd..
production] ls
# cd manifests
# ls
# vim site.pp

call the class from modules directory

i

$httpdservice=$osfamily?{
'RedHat' => 'httpd',
'Debian' => 'apache2',
default => 'httpd',
}

node 'ip-172-31-9-221.us-east-2.compute.internal'{

class{'linux':
}

class{'deploy':
}
}

class linux{

file{'/info1.txt':
 ensure => 'present',
 content => "file from server",
}
$admintools=['git','nano','screen']
package{$admintools:
 ensure => 'present',
}
package{$httpdservice:
 ensure => 'present',
 }
service{$httpdservice:
 ensure => 'running',
 enable => true,
}

:wq!

# puppet parser validate site.pp

AGENT

# puppet agent --test

# docker --version

***************************
go back to modules directory and now pull module from forge

# cd ..
production] # cd modules
modules]# puppet module install puppetlabs-vcsrepo

# ls
deploy  vcsrepo

# cd deploy
# ls
# cd manifests
# vim init.pp

class deploy {

package{'docker':
 ensure => 'present',
}
service{'docker':
 ensure => 'running',
 enable => true,
}
vcsrepo { '/tmp/gitrepo':
  ensure   => present,
  provider => git,
  source   => 'https://github.com/Sonal0409/dockerdemo.git',
}
}

:wq!

# puppet parser validate init.pp

Agent:
*******


# puppet agent --test

# cd /tmp
# ls
# git repo will be there


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

Lets pull another module docker to build the dockerfile and generate containers

***********************
cd ..
cd ..
modules] # puppet module install puppetlabs-docker

# ls
docker will be there

# cd deploy
# ls
# cd manifests
# vim init.pp


class deploy {

package{'docker':
 ensure => 'present',
}
service{'docker':
 ensure => 'running',
 enable => true,
}
vcsrepo { '/tmp/gitrepo':
  ensure   => present,
  provider => git,
  source   => 'https://github.com/Sonal0409/dockerdemo.git',
}
docker::image { 'myimage:puppet':
  docker_file => '/tmp/gitrepo/dockerfile'
}
docker::run { 'c1':
  image   => 'myimage:puppet',
  ports   => '8080',
}

}


:wq!
# puppet parser validate init.pp

Agent
*********

# puppet agent --test

it may fail..with ruby error.. run agian

# puppet agent --test

# docker images

# docker ps -a

Access application from web:

http://18.220.30.216:32768/sample/

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