Puppet – Automating Infrastructure Configuration
#

What is Puppet?
#

Puppet is an open-source configuration management tool that automates the provisioning, configuration, and management of infrastructure. It ensures that your systems are configured consistently and correctly according to predefined policies.

Why is Puppet a Configuration Management Tool?
#

Automates Setup: Ensures systems are consistently configured.
Infrastructure as Code: Uses a declarative language to define configurations.
Consistency: Enforces policies across systems, reducing configuration drift.

Use Cases
#

Provisioning: Automate setup of new servers.
Configuration: Maintain consistent system configurations.
Deployment: Automate software installations and updates.
Compliance: Ensure systems meet regulatory standards.

Dependencies
#

Puppet Agent: Installed on managed nodes.
Puppet Master: Central server distributing configurations.
Modules/Manifests: Code defining resource states.

Setting Up Puppet
#

To set up Puppet, you need a master server (Puppet Master) and one or more agent servers (Puppet Agents). Here’s a simplified guide:

Initial Setup
#

Update your repositories:
#

         sudo apt update

     sudo apt upgrade

Install Docker:

 sudo apt install docker.io

Pull the Puppet image:

sudo docker pull puppet

Create the Puppet Master container:

 sudo docker run --name puppet-master -it puppet7

Start the Docker service:

  sudo systemctl start docker

Run the Puppet Master container:

sudo docker start puppet-master

Check if the container is running:

```
 sudo docker ps -a
```
Installing Puppet Server:
```
  apt install puppetserver
```
Enter the container and install necessary utilities:
```
apt install vim net-tools
```
If you encounter issues with broken packages, run the following commands:
```
  apt update && sudo apt upgrade
```
comm : apt –fix-broken install

  apt clean

 apt autoremove && sudo apt-get autoremove

```
  apt-get install puppet-agent   
```

 apt-get install puppet-module-puppetlabs-mailalias-core

```
 apt-get install puppetserver 
```

else
Check the Java version:
```
 java -version 
```
(Note : Adjust Java configuration if necessary to manage system memory usage)
Check Puppet service:
```
 netstat -ntulp
```
(If you see port 8140, it means Puppet is listening to all ports.)
Set up the Certificate Authority:
```
  /opt/puppetlabs/bin/puppetserver ca setup
```
**
Check system information:**
```
 facter -p
```
Find the Fully Qualified Domain Name (FQDN):
```
 facter -p | grep fqdn 
```
Create a .pp file for Puppet configurations:
```
  puppet apply filename.pp 
```
Creating the Puppet Agent
Create the Puppet Agent container using the same image:
```
  sudo docker run --name puppet-agent01 -it puppet
```
(Note : Start and run the Puppet Agent container as described earlier)
Install Puppet Agent in the container:
```
  apt install puppet-agent 
```
Establishing Communication
Update /etc/hosts with IP and FQDN:
```
 vi /etc/hosts  (Note: Add the IP and FQDN at the end of the file) 
```
Run commands in the Puppet Agent container to establish communication with the master:
```
  /opt/puppetlabs/bin/puppetserver ca setup 
```
In the Puppet Master container, configure autosign in /etc/puppetlabs/puppet/puppet.conf:
autosign = true
In the Puppet Agent container, test the connection to the Puppet Master:
```
     puppet agent --test puppet_masterfqdn 
```
Managing Puppet Policies for both(master & agent )
In the Puppet Master container, navigate to:
```
cd /etc/puppetlabs/code/environments/production/manifests/ 
```
(Note : In this directory create this file )
Create init.pp and site.pp files to define policies and configurations.
In the Puppet Agent container, run the following command to apply policies from the master:
To run again you have to run this command again and again :
```
 puppet agent --test puppet_masterfqdn
```
P.S.
If you spot any mistakes, please don’t hesitate to point them out. We’re all here to learn together! 😊
Haris
FAST (NUCES)
BS Computer Science | Class of 2027
📌 GitHub: https://github.com/Zenvila
📌 LinkedIn: https://www.linkedin.com/in/haris-shahzad-7b8746291/
📌 Member: COLAB (Research Lab)

Puppet – Automating Infrastructure Configuration#

What is Puppet?#

Why is Puppet a Configuration Management Tool?#

Use Cases#

Dependencies#

Setting Up Puppet#

Initial Setup #

Update your repositories:#