Monday, April 27, 2020

How to configure Puppet Master and integrate with Puppet Agent/nodes on Ubuntu 18.0.4 | Puppet Master and Agent integration

Puppet uses Client/Server model. The server does all the automation of tasks on nodes/servers that have a client(agent) installed. The work of the Puppet agent is to send facts to the puppet master and request a catalog based on certain interval level(default time 30 mins). Once it receives a catalog, Puppet agent applies it to the node by checking each resource the catalog describes. It makes relevant changes to attain the desired state. The work of the Puppet master is to control configuration information.  Each managed agent node requests its own configuration catalog from the master.

Please find the steps needed for Integrating Puppet master and agent on Ubuntu 18.0.4:
Watch the steps in YouTube video:


a) One Ubuntu instance for Puppet Master - this instance should have 4 GB RAM, in AWS instance type should be at least t2.medium.
 Master ubuntu EC2 should have a security group to ensure that below ports are open in security firewall
        * TCP 8140 - Agents will talk to the master on this port(puppet enterprise)
        * TCP 22 - To login to the server/instance using SSH

b) one Ubuntu instance as node which will have agent installed - This can be micro instance.

1 Steps for Puppet Master:
Modify Puppet Master Hosts file to add hostname of Puppet Master
sudo vi /etc/hosts

(Add puppet master ip address and puppet next to it like shown below)

Download Puppet Master installation packages

curl -O
sudo dpkg -i puppet6-release-bionic.deb
sudo apt-get update

Install Puppet Master

sudo apt-get install puppetserver -y
sudo ufw allow 8140
sudo systemctl enable puppetserver.service

(the above command is to start the service during starting the Ubuntu instance)
sudo systemctl start puppetserver.service           
(The above command is for starting the server and this may take some time)

sudo systemctl status puppetserver.service

Now press q to come out of window.

Verify version of Puppet Master

apt policy puppetserver

2 - Steps for Puppet Agent

Step 2.1 First edit the hosts file on the puppet agent by modifying /etc/hosts
sudo vi /etc/hosts

# Please add Puppet Master server IP address and space and enter puppet
puppet_master_ip_address   puppet

(please do not use public DNS name, use only private IP address)  

Press Ctrl O for saving and then enter
Press Ctrl X for exit after saving

Step 2.2 — Installing Puppet Agent on server node that Puppet master will manage
curl -O
sudo dpkg -i puppet6-release-bionic.deb
sudo apt-get update
sudo apt-get install puppet-agent -y
sudo systemctl enable puppet
sudo systemctl restart puppet
sudo systemctl status puppet


Now press q to come out of window.

Step 3 - Signing certificates on Puppet Master
The first time you run the Puppet agent, it generates an SSL certificate and sends a signing request to the Puppet master. After the Puppet master signs the agent's certificate, it will be able to communicate  with and control the agent node.

First list the unsigned certificates on puppet master EC2 instance

sudo /opt/puppetlabs/server/bin/puppetserver ca list

The above command will list agent ip address.
  "your_puppet_Agent_Ec2_private_dns_name"  (SHA256) 46:19:79:3F:70:19:0A:FB:DA:3D:C8:74:47:EF:C8:B0:05:8A:06:50:2B:40:B3:B9:26:35:F6:96:17:85:5E:7C

Now sign the Puppet agent IP address.
sudo /opt/puppetlabs/server/bin/puppetserver ca sign --certname 

Step 4 - Verifying installation by creating Manifests in Puppet Master

The puppet manifest file is the actual file which contains the configuration details for the agents. This file is centrally stored at Puppet Master.

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

#copy the below yellow lines in the above file
    file {'/tmp/puppet_test.txt':                        # resource type file and filename
    ensure  => present,                      
       # make sure it exists
    mode    => '0644',                       
       # file permissions
  content => "Hello from Puppet master to agent on ${ipaddress_eth0}!\n",  # Print the eth0 IP fact

Press Ctrl O for saving and then enter
Press Ctrl X for exit after saving

Step 5 - Apply Manifests in Puppet Agent
apply the changes in puppet agent by executing below command:
sudo /opt/puppetlabs/bin/puppet agent --test


You should see a file being modified in /tmp/puppet_works.txt in agent(node).
You can confirm by typing this command on puppet node 

sudo cat /tmp/puppet_test.txt
Hello from Puppet master to agent on IP_address!!

That's it! you have set up Puppet Master and configured agent on the target node successfully!

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