Daily Puppet -2

It has been a while since I wrote something on this blog(Not that there are people expecting something in here). However, it is mostly for my reference. Puppet is something which I am interested in learning and making amends since sometime to learn it. I did some learning and later dropped it like many other my learning projects.

So, I learnt how to create Users and Home directories.

As usual I have revise the basics.

The resources are manifests, can be a USER, SOFTWARE, SERVICE etc. They have to be defined in the manifests folder of their own for their better manageability.

/etc/puppet/modules

root@ubuntu:/etc/puppet/modules# ls -l

drwxr-xr-x 3 root root 4096 Jun 9 19:25 homedirs

drwxr-xr-x 3 root root 4096 Jun 9 19:25 users

As shown in the above snippet, two modules have been created.

Each of this module folders will have a manifest folder within it

A very good demo is here,

http://theruddyduck.typepad.com/theruddyduck/2013/11/using-puppet-to-configure-users-groups-and-passwords-for-cloudera-manager.html

this blog has wonderful crisp explanation

Let us examine on init.pp file

root@ubuntu:/etc/puppet/modules/users/manifests# pwd

/etc/puppet/modules/users/manifests

cat init.pp

class users {

group {'edinhazard':

ensure => present,

}

user {'edinhazard':

ensure => present,

gid => 'edinhazard',

shell => '/bin/bash',

home => '/home/edinhazard',

managehome => 'true',

password => '$1$CcKAjalB$nUN4y42rmL5ptKs6413Id0',

}

}

this init.pp file first defines a class called “users”

within the class “users”, we define objects that can be assigned to a user.

Next we look at another module which is “homedirs”.

root@ubuntu:/etc/puppet/modules/homedirs# cat manifests/init.pp

class homedirs {

file{"/home/edinhazard":

ensure => "directory",

owner => "edinhazard",

group => "edinhazard",

}

}

here we are making sure the home directory created for user 'edinhazard' has the right permissions.

Once defining these how do we call them to be installed on the nodes?

there is a file in the “/etc/puppet/manifests” folder named 'nodes.pp'. Assign the modules to the node 'desktop' as shown below.

root@ubuntu:/etc/puppet/manifests# cat nodes.pp

node 'desktop' {

include users

include homedirs

}

Now we apply the configuration on the client, i.e., “desktop”

From the CLIENT Node, we run puppet agent --test

puppet agent --test

Info: Retrieving plugin

Info: Caching catalog for desktop.home

Info: Applying configuration version '1402368999'

Notice: /Stage[main]/Users/Group[edinhazard]/ensure: created

Notice: /Stage[main]/Users/User[edinhazard]/ensure: created

Notice: Finished catalog run in 0.71 seconds

Lets now see, if the desired user has been created,

cat /etc/passwd | grep edin

edinhazard:x:1001:1001::/home/edinhazard:/bin/bash

root@desktop:/home# ls -l | grep edin

drwxr-xr-x 2 edinhazard edinhazard 4096 Jun 22 11:59 edinhazard

So, puppet did what has been asked to do. This is a simple configuration applied

Syntax reference

http://www.puppetcookbook.com/posts/create-home-directory-for-managed-users.html