Hack The Sec-Leading Resource Of Linux Tutorial: Foreman

How to Add Puppet Nodes to Foreman – CentOS 7 / Ubuntu 14.04

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Puppet Nodes to Foreman – CentOS 7 / Ubuntu 14.04 
Puppet is an open-source configuration management tool. It runs on many Unix-like systems as well as on Microsoft Windows, and includes its own declarative language to describe system configuration. 
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfyaHydR2dsd1VxEV8holOMAFNMnvGjL0OPYRu4Efz8smXMdvWTT47kx5zHrkRK31WTfrDo31tMb9m9lXyI8M_YdP0XRDUzVJloYX5BMP4xGU5saG4qdA5LiIHAl5mUf7BtaCvBhE2yn5s/s1600/puppet-labs-hackthesec.co.in.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="315" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfyaHydR2dsd1VxEV8holOMAFNMnvGjL0OPYRu4Efz8smXMdvWTT47kx5zHrkRK31WTfrDo31tMb9m9lXyI8M_YdP0XRDUzVJloYX5BMP4xGU5saG4qdA5LiIHAl5mUf7BtaCvBhE2yn5s/s320/puppet-labs-hackthesec.co.in.png" width="320" /></a></div>
 
Puppet is produced by Puppet Labs, founded by Luke Kanies in 2005. It is written in Ruby and released as free software under the GNU General Public License (GPL) until version 2.7.0 and the Apache License 2.0 after that. 
 
Foreman (also known as The Foreman) is an open source complete life cycle systems management tool for provisioning, configuring and monitoring of physical and virtual servers. Foreman has deep integration to configuration management software, with Puppet, Chef, Salt and other solutions through plugins, which allows you to automate repetitive tasks, deploy applications and manage change to deployed servers. 
 
 
Foreman provides provisioning on bare-metal (through managed DHCP, DNS, TFTP, and PXE-based unattended installations), virtualization and cloud. Foreman provides comprehensive, auditable interaction facilities including a web frontend, a command line interface, and a robust REST API. 
 
 
<ul style="text-align: left;">
<li><a href="http://www.hackthesec.co.in/2016/06/how-to-install-foreman-on-centos-7-rhel.html" style="font-family: verdana, geneva, sans-serif; font-size: x-large; line-height: 26px;" target="_blank">How To Install Foreman on CentOS 7 / RHEL 7 / Ubuntu 14.04</a></li>
</ul>
 
 
INSTALLATION :- 
 
Make sure your system (both puppet server and client) is able to resolve the hostname each other, either use /etc/hosts file or DNS server. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">vi /etc/hosts</pre>
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">192.168.2.10 server.hackthesec.local server # Foreman
192.168.2.20 centos.hackthesec.local centos # CentOS 7 Agent
192.168.2.30 ubuntu.hackthesec.local ubuntu # Ubuntu 14.04 Agent</pre>
 
Install Puppet Agent on CentOS 7: 
Puppetlabs repository in order to get a puppet agent packages from official source. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">rpm -ivh https://yum.puppetlabs.com/puppetlabs-release-el-7.noarch.rpm

yum -y install puppet
</pre>
Install Puppet Agent on Ubuntu 14.04: 
Puppet agent, we have to configure Puppetlabs repository on Ubuntu 14.04. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">wget https://apt.puppetlabs.com/puppetlabs-release-trusty.deb
sudo dpkg -i puppetlabs-release-trusty.deb

sudo apt-get update

sudo apt-get install puppet
</pre>
Configure puppet agent on CentOS 7 / Ubuntu 14.04: 
Once the installation is done, we will need to update the "/etc/puppet/puppet.conf" file. 
 
There are two section on the agent node's puppet config file, a [main] and [master] section. Add the following settings to your [main] settings. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">vi /etc/puppet/puppet.conf</pre>
Comment or Delete "templatedir=$confdir/templates" line and enter your details Foreman (Puppet Master) in "server = hostname" line 
<pre style="background-color: whitesmoke; border-radius: 4px; border: 1px solid rgb(204, 204, 204); box-sizing: border-box; margin-bottom: 10px; overflow: auto; padding: 9.5px; word-break: break-all; word-wrap: break-word;">[main]
logdir=/var/log/puppet
vardir=/var/lib/puppet
ssldir=/var/lib/puppet/ssl
rundir=/var/run/puppet
factpath=$vardir/lib/facter
#templatedir=$confdir/templates
### Add Below Lines ###
server = server.hackthesec.local
report = true
pluginsync = true</pre>
Edit /etc/default/puppet to enable puppet service. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">vi /etc/default/puppet</pre>
Setting this to "yes" allows the puppet agent service to run. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">START=yes</pre>
To enable and run puppet agent service. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">puppet resource service puppet ensure=running enable=true</pre>
Sign Puppet Agent certificate: 
Now, you will have to sign the certificates of puppet agents in order to work with Foreman, issue the following command to list down the unsigned certificates. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">[root@hackthesec server ~]# puppet cert list
"ubuntu.hackthesec.local" (SHA256) 35:D1:B5:67:52:1C:1C:BH:6H:DD:3C:2E:B0:28:D7:15:52:95:32:95:1F:37:29:2G:5F:D7:4C:F5:DB:94:A1:B2</pre>
In the above output, "ubuntu.hackthesec.local" is the puppet agent. To sign the certificate follow below command 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">[root@hackthesec server ~]# puppet cert sign ubuntu.hackthesec.local
Notice: Signed certificate request for ubuntu.hackthesec.local
Notice: Removing file Puppet::SSL::CertificateRequest ubuntu.hackthesec.local at '/var/lib/puppet/ssl/ca/requests/ubuntu.hackthesec.local.pem'</pre>
Console Mode: 
Open your Foreman web console, go to Infrastructure –> Smart proxies. Click Certificates button. 
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You see  agent certificate (ubuntu.hackthesec.local) is pending to be signed. To sign, click Sign button. 
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After that your agent (ubuntu.hackthesec.local) is signed successfully. 
To verify the node go to Hosts –> All Hosts. Verify that the new node (ubuntu.hackthesec.local) has been added to Foreman. 
Troubleshooting 
In case if you want to remove the puppet agent from the Puppet master, run. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">[root@hackthesec server ~]# puppet cert clean ubuntu.hackthesec.local
Notice: Revoked certificate with serial 3
Notice: Removing file Puppet::SSL::Certificate ubuntu.hackthesec.local at '/var/lib/puppet/ssl/ca/signed/ubuntu.hackthesec.local.pem'
Notice: Removing file Puppet::SSL::Certificate ubuntu.hackthesec.local at '/var/lib/puppet/ssl/certs/ubuntu.hackthesec.local.pem'</pre>
In case, if you want to re-register the puppet agent that you just deleted in previous step. Follow the below procedure. 
 
Stop the puppet service. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">service puppet stop</pre>
Delete the puppet agent ssl directory. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">rm -rf /var/lib/puppet/ssl/certs</pre>
Start the puppet service. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">service puppet start</pre>
Now, you can go and run the "puppet cert list" command on Foreman (puppet master) server to see the signing request, approve it incase you required. 
 
 
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<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div>
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How to Add Puppet Nodes to Foreman – CentOS 7 / Ubuntu 14.04

Puppet Nodes to Foreman – CentOS 7 / Ubuntu 14.04 Puppet is an open-source configuration management tool. It runs on many Unix-like system...

How To Install Foreman on CentOS 7 / RHEL 7 / Ubuntu 14.04

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Install Foreman on CentOS 7 / RHEL 7 / Ubuntu 14.04.3 
Foreman (also known as The Foreman) is an open source complete life cycle systems management tool for provisioning, configuring and monitoring of physical and virtual servers. Foreman has deep integration to configuration management software, with Puppet, Chef, Salt and other solutions through plugins, which allows you to automate repetitive tasks, deploy applications and manage change to deployed servers. 
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Foreman provides provisioning on bare-metal (through managed <a href="http://www.hackthesec.co.in/search/label/DHCP" target="_blank">DHCP</a>, DNS, TFTP, and PXE-based unattended installations), virtualization and cloud. Foreman provides comprehensive, auditable interaction facilities including a web frontend, a command line interface, and a robust REST API. 
 
<ul style="text-align: left;">
<li><a href="http://www.hackthesec.co.in/2016/06/how-to-add-puppet-nodes-to-foreman.html" style="font-family: verdana, geneva, sans-serif; line-height: 26px;" target="_blank">How to Add Puppet Nodes to Foreman – CentOS 7 / Ubuntu 14.04</a></li>
</ul>
 
INSTALLATION:- 
Before installing Foreman, make sure you have setup a FQDN for your server. 
 
Note: You should do this on both <a href="http://www.hackthesec.co.in/search/label/Centos" target="_blank">CentOS </a>and <a href="http://www.hackthesec.co.in/search/label/Ubuntu" target="_blank">Ubuntu</a>. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">vi /etc/hosts</pre>
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">192.168.2.10 server.hackthesec.local server</pre>
Also, do not forget to setup the valid hostname for the above host entry. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">vi /etc/hostname</pre>
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">server.hackthesec.local</pre>
Install Foreman on CentOS 7 / RHEL 7: 
Configure EPEL, Puppet and Foreman repositories. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">### CentOS 7 / RHEL7 ###

rpm -ivh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

rpm -ivh http://yum.puppetlabs.com/puppetlabs-release-el-7.noarch.rpm

rpm -ivh http://yum.theforeman.org/releases/1.9/el7/x86_64/foreman-release.rpm

### Enable the RHEL Optional and RHSCL repos on RHEL 7 ###

yum-config-manager --enable rhel-7-server-optional-rpms rhel-server-rhscl-7-rpms</pre>
Run the following command to download Foreman installer. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">yum -y install foreman-installer</pre>
Now, run the Foreman installer to start installing Foreman. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">foreman-installer</pre>
The installation run is non-interactive, but the configuration can be customized by supplying any of the options listed in foreman-installer –help, or by running foreman-installer -i for interactive mode. 
 
 
Once the installation is completed, you will see an output like below where you would find the initial username and password to access the Foreman. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">Success!
  * Foreman is running at https://server.hackthesec.local
      Initial credentials are admin / M8GEY5BH4cffgbuheu
  * Foreman Proxy is running at https://server.hackthesec.local:8443
  * Puppetmaster is running at port 8140
  The full log is at /var/log/foreman-installer/foreman-installer.log</pre>
Firewall Configuration: 
The following ports are used by the components of Foreman, needs to be allowed in IP tables (FirewallD) / Hardware Firewall. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">firewall-cmd --permanent --add-port=53/tcp
firewall-cmd --permanent --add-port=67-69/udp
firewall-cmd --permanent --add-port=80/tcp
firewall-cmd --permanent --add-port=443/tcp
firewall-cmd --permanent --add-port=3000/tcp
firewall-cmd --permanent --add-port=3306/tcp
firewall-cmd --permanent --add-port=5910-5930/tcp
firewall-cmd --permanent --add-port=5432/tcp
firewall-cmd --permanent --add-port=8140/tcp
firewall-cmd --permanent --add-port=8443/tcp
firewall-cmd --reload</pre>
Install Foreman on Ubuntu 14.04: 
Make sure you have setup a FQDN mentioned in prerequisites. Now, we will install Foreman on Ubuntu.Setup a puppet repository, 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">apt-get -y install ca-certificates
wget https://apt.puppetlabs.com/puppetlabs-release-trusty.deb
dpkg -i puppetlabs-release-trusty.deb</pre>
Enable the Foreman repo. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">echo "deb http://deb.theforeman.org/ trusty nightly" > /etc/apt/sources.list.d/foreman.list
echo "deb http://deb.theforeman.org/ trusty nightly" >> /etc/apt/sources.list.d/foreman.list
wget -q http://deb.theforeman.org/pubkey.gpg -O- | apt-key add -</pre>
Download the Foreman installer. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">apt-get update && apt-get -y install foreman-installer</pre>
Run the Foreman installer. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">foreman-installer</pre>
Once the installation is completed, you will see an output like below, 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">Success!
  * Foreman is running at https://server.hackthesec.local
      Initial credentials are admin / M8GEY5BH4cffgbuheu
  * Foreman Proxy is running at https://server.hackthesec.local:8443
  * Puppetmaster is running at port 8140
  The full log is at /var/log/foreman-installer/foreman-installer.log</pre>
Note down intial username and password, you need this for accessing Foreman’s dashboard. 
Configure Foreman (Optional): 
If your Foreman host is not visible in Hosts –> All Hosts tab, you should run below command which will send the first Puppet report to Foreman, automatically creating the host in Foreman’s database. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">puppet agent --test

Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Caching catalog for server.hackthesec.local
Info: Applying configuration version '1445821177'
Notice: Finished catalog run in 0.56 seconds</pre>
Puppet 3+ will show a warning the first time that the node can’t be found, this can be ignored. 
Access Foreman Web Console: 
Open up your favourite web browser, navigate to https://your-ip-address or https://FQDN 
 
You should get login page, enter your Foreman credentials. 
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Once you logged in, you will get an overview page. Like below. 
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To list down the available hosts, goto Hosts –> All Hosts from Menu. Since we do not have any puppet clients, All Hosts tab would only list your Foreman host, with an "O"status. This indicates its status is OK, with no changes made on the last Puppet run. 
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It is recommended to change the password of Admin user for security reasons. To do that, click UserName (Top right)  –> My Account, you would end up with an option to change a password. 
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Download and Install NTP module: 
One of the more important requirement of puppet is to have an accurate time-keeping, to do this, we will install Puppet NTP module for managing the NTP service. 
 
If you have Puppet 2.7.14 or higher, install the module automatically from Puppet Forge to our “production” environment (the default). 
 
 
Use following command to install NTP module on Foreman (Puppet master) host. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">[root@hackthesec server ~]# puppet module install -i /etc/puppet/environments/production/modules saz/ntp

Notice: Preparing to install into /etc/puppet/environments/production/modules ...
Notice: Downloading from https://forgeapi.puppetlabs.com ...
Notice: Installing -- do not interrupt ...
/etc/puppet/environments/production/modules
└── saz-ntp (v2.3.2)</pre>
In Foreman's web console, go to Configure > Puppet Classes and click Import from hostname (server.hackthesec.local) to read the available Puppet classes from the puppet master and populate Foreman's database. 
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Select the NTP module and click the update button. 
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After clicking the update button, you will see something like below. The "ntp" class will appear in the Puppet class list if installed correctly. Click on NTP class on the left. 
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Now, Click the Smart Class Parameter and then select server list on the left side. Tick the Override checkbox so Foreman manages the "server list" parameter of the class, then click Submit. 
 
Note: Change the default value if you want to use your own NTP servers. 
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Go to Hosts –> All Hosts, edit the Foreman host. 
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Go to Puppet Classes tab and expand the ntp module and click the + icon to add the ntp class to the host, then click submit. 
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This time, it will take you automatically to the host details page. Click on YAML, it will show the ntp class and the server list parameter, as passed to Puppet via the ENC (external node classifier) interface. 
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At last, run the following command on the Foreman host to see the NTP service automatically reconfigured by Puppet and the NTP module. 
<pre style="background: rgb(68, 67, 65); border-radius: 6px; border: 1px solid rgb(227, 227, 227); box-sizing: border-box; clear: none !important; color: white; font-family: monospace, serif; font-size: 14px; margin-bottom: 10px !important; margin-top: 10px !important; overflow: auto; padding: 10px !important; width: auto !important; word-break: break-all;">puppet agent --test</pre>
Verify the installation of NTP module by going to Hosts –> All Hosts –> Select Foreman Host –> Reports –> Select latest report. 
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<a href="http://www.hackthesec.co.in/">www.hackthesec.co.in</a></div>
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