Puppet_Notes.txt

Manifest 1:
-----------
site.pp: 

We'll begin by creating the default manifest, site.pp, in the default location

/etc/puppetlabs/code/environments/production/manifests/site.pp

file {'/tmp/hellodevops':                        # resource type file and filename

  ensure  => present,                             # make sure it exists

  mode    => '0644',                              # file permissions

  content => "It works on ${ipaddress_eth0}!\n",  # Print the eth0 IP fact 
}
puppet parser validate site.pp # fir syntax errors


By default Puppet Server runs the commands in its manifests by default every 30 minutes. If the file is removed, the ensure directive will cause it to be recreated. The mode directive will set the file permissions, and the content directive add content to the directive.

We can also test the manifest on a single node using puppet agent --test. Note that --test is not a flag for a dry run; if it's successful, it will change the agent's configuration.


/opt/puppetlabs/bin/puppet agent --test  # run on Nodes

You can check the log file on the Puppet master to see when Puppet last compiled the catalog for an agent, which indicates that any changes required should have been applied.

 tail /var/log/puppetlabs/puppetserver/puppetserver.log
 
 
 Manifest 2:
 -----------
 site.pp
 
 # execute 'apt-get update'
exec { 'apt-update':                    # exec resource named 'apt-update'
  command => '/usr/bin/apt-get update'  # command this resource will run
}

# install apache2 package
package { 'apache2':
  require => Exec['apt-update'],        # require 'apt-update' before installing
  ensure => installed,
}

# ensure apache2 service is running
service { 'apache2':
  ensure => running,
}

# install mysql-server package
package { 'mysql-server':
  require => Exec['apt-update'],        # require 'apt-update' before installing
  ensure => installed,
}

# ensure mysql service is running
service { 'mysql':
  ensure => running,
}

# install php5 package
package { 'php7.0':
  require => Exec['apt-update'],        # require 'apt-update' before installing, v5 for os < v16
  ensure => installed,
}

# ensure info.php file exists
file { '/var/www/html/info.php':
  ensure => file,
  content => '<?php  phpinfo(); ?>',    # phpinfo code
  require => Package['apache2'],        # require 'apache2' package before creating
}



Manifest 3:
-----------
tou may use node definitions with class also

node 'nodename'{
class{'linux':}
}

node 'node2'{
other code
}

class linux{
# execute 'apt-get update'
exec { 'apt-update':                    # exec resource named 'apt-update'
  command => '/usr/bin/apt-get update'  # command this resource will run
}

# install apache2 package
package { 'apache2':
  require => Exec['apt-update'],        # require 'apt-update' before installing
  ensure => installed,
}

# ensure apache2 service is running
service { 'apache2':
  ensure => running,
}
}



Manifest 4:
-----------
site.pp
# remove git on remote node
node 'ip-172-31-23-98.ap-south-1.compute.internal'{
class{'linux':}
}
class linux{
# execute 'apt-get update'
$soft=['git','vim']
exec { 'apt-update':
  command => '/usr/bin/apt-get update'
}

# install soft
package {$soft:
  require => Exec['apt-update'],
  ensure => installed,
}
}


Puppet Environment:
-------------------
  By default node is connecting to production and calling site.pp
we can create another env on master.

/etc/puppetlabs/code/environments# mkdir QA
/etc/puppetlabs/code/environments# cd QA
/etc/puppetlabs/code/environments/QA# mkdir manifests
/etc/puppetlabs/code/environments/QA# cd manifests/

create manifest here
site.pp

node 'ip-172-31-23-98.ap-south-1.compute.internal'{
file{'/tmp/QAEnvFile':
 ensure => 'present',
 content => " created from QA ENV"
}
}

NOW go back to Nodes
open /etc/puppetlabs/puppet/puppet.conf
edit and enter below value

environment=QA

/opt/puppetlabs/bin/puppet agent --test

 Automatic Pull:
 --------------
 
 go to node puppet.conf and edit runinterval=1m or 2m
  /etc/puppetlabs/puppet# vi puppet.conf
  runinterval=1m
  
now you will see the change on node in 1 min
 
Modules:
-----------

we are building a project with modules.. 
php, apache,mysql,code

go to production folder om master
mkdir modules
cd modules

puppet module generate ravi-site --environment production

now module will be created (it asks a few questions.. just follow)

root@ip-172-31-26-231:/etc/puppetlabs/code/environments/production/modules/ravi-site# ls -ltr
total 28
drwxr-xr-x 2 root root 4096 Dec  9 09:35 tests
drwxr-xr-x 3 root root 4096 Dec  9 09:35 spec
-rw-r--r-- 1 root root 2891 Dec  9 09:35 README.md
-rw-r--r-- 1 root root  633 Dec  9 09:35 Rakefile
-rw-r--r-- 1 root root  268 Dec  9 09:35 metadata.json
drwxr-xr-x 2 root root 4096 Dec  9 09:35 manifests
-rw-r--r-- 1 root root  242 Dec  9 09:35 Gemfile

Go to Manifests.. it has init.pp
now init.pp contains default class with the name we have, now start editing.

step1: edit class section with below code

class site {
 package{'php-mysql':,
  ensure => 'present',
    }
 package{'php-xml':,
  ensure => 'present',
    }
 }

By default our nodes talk to only site.pp under production/manifests.

Now we need to include our init.pp as part of site.pp


our site.pp: 
------------
node 'ip-172-31-23-98.ap-south-1.compute.internal'{
class{'linux':}
class{'site':}   # this is from our site module
}
class linux{
# execute 'apt-get update'
$soft=['git','vim']
exec { 'apt-update':
  command => '/usr/bin/apt-get update'
}

# install soft
package {$soft:
  require => Exec['apt-update'],
  ensure => installed,
}
}


=====================================================================================

node 'ip-172-31-12-122.us-east-2.compute.internal'{

file {'/tmp/node1':                        # resource type file and filename
  ensure  => present,                             # make sure it exists
  mode    => '0644',                              # file permissions
  content => "It works on ${ipaddress_eth0}!\n",  # Print the eth0 IP fact
}

class{'node1':}

}

node 'ip-172-31-0-235.us-east-2.compute.internal'{

file {'/tmp/node2':                        # resource type file and filename
  ensure  => present,                             # make sure it exists
  mode    => '0644',                              # file permissions
  content => "It works on ${ipaddress_eth0}!\n",  # Print the eth0 IP fact
}
class{'node2':}
}

class node1{
# execute 'apt-get update'
exec { 'apt-update':                    # exec resource named 'apt-update'
  command => '/usr/bin/apt-get update'  # command this resource will run
}

# install apache2 package
package { 'nginx':
  require => Exec['apt-update'],        # require 'apt-update' before installing
  ensure => installed,
}

# ensure apache2 service is running
service { 'nginx':
  ensure => running,
}
}

class node2{
# execute 'apt-get update'
exec { 'apt-update':                    # exec resource named 'apt-update'
  command => '/usr/bin/apt-get update'  # command this resource will run
}

# install apache2 package
package { 'apache2':
  require => Exec['apt-update'],        # require 'apt-update' before installing
  ensure => installed,
}

# ensure apache2 service is running
service { 'apache2':
  ensure => running,
}
}



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