What
is Puppet?
Puppet
is IT automation software that helps system administrators manage
infrastructure throughout its lifecycle, from provisioning and
configuration to orchestration and reporting. Using Puppet, you can
easily automate repetitive tasks, quickly deploy critical
applications, and proactively manage change, scaling from 10s of
servers to 1000s, on-premise or in the cloud.
How
the puppet works?
It
works like this..Puppet agent is a daemon that runs on all the client
servers(the servers where you require some configuration, or the
servers which are going to be managed using puppet.)
All
the clients which are to be managed will have puppet agent installed
on them, and are called nodes in puppet.
Puppet Master:This machine contains all the configuration for different hosts. Puppet master will run as a daemon on this master server.
Puppet Agent:This is the daemon that will run on all the servers, which are to be managed using puppet. Puppet agent will go and ask the configuration for itself from the puppet master server at a specific time interval.
The
connection between puppet agent and master is made in a secure
encrypted channel with the help of SSL.
If
suppose the puppet agent has already applied the required
configuration and there are no new changes then it will do nothing.
Note:
You
can also manually ask puppet agent to go and fetch the configuration
from the puppet master server whenever required. People manage puppet
agent to fetch configuration through a cron. But managing puppet
agent to automatically fetch data, by running it as a daemon on every
node is a good idea.
30
minutes is the default interval when puppet agent daemon will go and
fetch config data from puppet master.
As
shown in the above figure puppet master server has all the
configuration options for Host
1(or call it the first node), Host 2(node 2),Host 3(node 3).
An
important fact to note is that it is the client(puppet agent or
nodes) who go and fetches the configuration data from the puppet
master server at a regular interval.
Now
there are multiple steps involved whenever a puppet agent of any node
connects
to
a puppet master server for fetching data. These steps are mentioned
below.
Step
1:Whenever
a client node connects to the master, the master server analyzes the
configuration to be applied to the node, and how
to apply that
configs on the node.
Step
2:Puppet
master server Takes and collects all the resources and configurations
to be applied to the node, and compiles it and make it a catalog.
This catalog is given to the puppet agent of the node.
Step
3: Puppet
agent will apply the configuration on the node, according to the
catalog, and then reply back, and submit the report
of
the configuration applied to the puppet master server.
How does Puppet Work with Different Platforms?
This
is possible with the help of a tool called as Facter. Whenever the
agent connects to the puppet master server for
configuration data, Facter tool is used to give the complete details
about the node(agent) to the puppet master. Facter will provide
almost all information about the agent node. The information is very
much detailed. See an example output of Facter below.
[root@myvm1 ~]# facter architecture => i386 augeasversion => 0.10.0 boardmanufacturer => Intel Corporation boardproductname => 440BX Desktop Reference Platform boardserialnumber => None domain => sarath.com facterversion => 1.6.6 fqdn => myvm1.sarath.com hardwareisa => i686 hardwaremodel => i686 hostname => myvm1 id => root interfaces => eth0,lo,sit0 ipaddress => 192.168.159.128 ipaddress_eth0 => 192.168.159.128 ipaddress_lo => 127.0.0.1 is_virtual => true kernel => Linux kernelmajversion => 2.6 kernelrelease => 2.6.18-128.el5 kernelversion => 2.6.18 lsbdistcodename => Tikanga
the
output of facter is much more detailed than the above example output
shown.
Puppet
master gets the complete
information about
the node, and takes a decision with the help of that information on
how to apply the configuration.
For
example if suppose the node is debian then to install a package
puppet will use apt-get instead of yum.
You
can do stuff's like if the IP address is this, then apply this
gateway to the server. And you can also add custom made facts to a
node, and do configuration based on that fact(this makes puppet much
more customizable).
You
require Facter tool to be installed on all the nodes, where you want
to apply configuration using puppet. Without Facter, there is no way
through which puppet server will get all information about the agent.
Puppet detailed workflow
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