Puppet is an open source configuration management utility. It runs on mostly all Unix/Linux flavors as well as on Microsoft Windows, and includes its own declarative language to describe system configuration.
With Puppet, repetitive tasks are automated away, so sysadmins can quickly deploy business applications, scaling easily from tens of servers to thousands, both on-premise and in the cloud.
Puppet is written in a declarative language, means you tell Puppet what results you want, rather than how to get there.
Puppet is produced by Puppet Labs, founded by Luke Kanies in 2005. It is written in Ruby and released as free software under the GPL.
Most of Puppet’s functionality comes from a single puppet command, which has many sub-commands.
Most importantly there is a sub-command called resource. The resource subcommand can inspect and modify resources interactively.
[root@server manifests]# puppet resource service
service { 'NetworkManager':
ensure => 'running',
enable => 'true',
}
service { 'abrt-ccpp':
ensure => 'running',
enable => 'true',
}
service { 'abrt-oops':
ensure => 'running',
enable => 'true',
}
service { 'abrtd':
ensure => 'running',
enable => 'true',
}
This command inspected every service on the system, whether running or stopped.
Similarly you can use user or group or package to see all the users or groups or packages in a particular machine.
Resource is
identified by a title, it has a number of attributes (which are defined
by the type), and each attribute has a value.
[root@server manifests]# puppet resource user bbee
user { 'bbee':
ensure => 'present',
comment => 'Bumble_Bee',
gid => '500',
home => '/home/bbee',
password =>
'$6$Pjmnk8u7w6vTbUmz$2d.H3EjNSdm9rKLMzgTYfYb1rZaMxt1qTs106zDUWb8OfvyEVpOOYBPq8tXkfCLo3XElMYpAATRVMnRkk5LJx1',
password_max_age => '99999',
password_min_age => '0',
shell => '/bin/bash',
uid => '500',
}
[root@server manifests]#
By firing puppet resource user bbee, what puppet will do it will fetch all the attributes of the user bbee and print that to your command line. If incase the user is not there in the machine it will say that the user is absent.
[root@server ~]# puppet resource user sunny
user { 'sunny':
ensure => 'absent',
}
[root@server ~]#
Now suppose if you want to create this user on the machine, either you can use useradd command or system-config-users if you are a RHEL user but just think about it that you want to add the user but you don't know how to add the user.
Puppet can help you to get this done, either you can write a manifest for it or you can fire below command on the CLI.
[root@server ~]# puppet resource user sunny comment=Sunny_B
notice: /User[sunny]/ensure: created
user { 'sunny':
ensure => 'present',
comment => 'Sunny_B',
}
[root@server ~]#
Now if you again try to search the user sunny on this machine it will show all its attributes:
[root@server ~]# puppet resource user sunny
user { 'sunny':
ensure => 'present',
comment => 'Sunny_B',
gid => '501',
home => '/home/sunny',
password => '!!',
password_max_age => '99999',
password_min_age => '0',
shell => '/bin/bash',
uid => '501',
}
[root@server ~]#
To delete the user just type in absent instead of present.
[root@server ~]# puppet resource user sunny ensure=absent
The core sub-commands of puppet are:
Puppet can do lot of things, to know more about it you can go to puppetlabs official website.
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