Puppet Client Installation Steps

I am sharing the steps to be followed to install Puppet on CentOS.
I will not cover the steps to followed to CentOS.

• Install CentOS
• Edit the /etc/ssh/sshd_config file, ensure Permit Root Login is YES
• Install Yum Repo for Puppet 

$rpm -ivh http://yum.puppetlabs.com/puppetlabs-release-el-6.noarch.rpm ]

         [ Please validate the arch of the Linux distribution you are using ]

• Now install puppet using Yum  

$yum install puppet 

• Edit the puppet.conf file to add the puppet server. Also add puppet server in the /etc/hosts to make sure it points to the right server node.

[main]

    # The Puppet log directory.

    # The default value is '$vardir/log'.

    logdir = /var/log/puppet

    # Where Puppet PID files are kept.

    # The default value is '$vardir/run'.

    rundir = /var/run/puppet

    # Where SSL certificates are kept.

    # The default value is '$confdir/ssl'.

    ssldir = $vardir/ssl

[agent]

    # The file in which puppetd stores a list of the classes

    # associated with the retrieved configuratiion.  Can be loaded in

    # the separate ``puppet`` executable using the ``--loadclasses``

    # option.

    # The default value is '$confdir/classes.txt'.

    classfile = $vardir/classes.txt

    # Where puppetd caches the local configuration.  An

    # extension indicating the cache format is added automatically.

    # The default value is '$confdir/localconfig'.

    localconfig = $vardir/localconfig

server = puppet1.mylabserver.com

• test the setup by using the command $puppet agent -t

[root@host2 puppet]# puppet agent -t

Info: Creating a new SSL key for host2.mylabserver.com

Info: csr_attributes file loading from /etc/puppet/csr_attributes.yaml

Info: Creating a new SSL certificate request for host2.mylabserver.com

Info: Certificate Request fingerprint (SHA256): 02:85:1F:AF:BF:04:32:93:A6:64:5B:CE:04:5B:CF:99:BF:1B:C9:D6:BA:20:84:0E:E4:F3:84:D4:2C:D8:F4:B3

Exiting; no certificate found and waitforcert is disabled

• Sign the certificate at the master node :

[root@puppet1 ~]# puppet cert list

  "host2.mylabserver.com" (SHA256) 02:85:1F:AF:BF:04:32:93:A6:64:5B:CE:04:5B:CF:99:BF:1B:C9:D6:BA:20:84:0E:E4:F3:84:D4:2C:D8:F4:B3
[root@puppet1 ~]# puppet cert sign host2.mylabserver.com
Notice: Signed certificate request for host2.mylabserver.com
Notice: Removing file Puppet::SSL::CertificateRequest host2.mylabserver.com at '/etc/puppetlabs/puppet/ssl/ca/requests/ashsethi2.mylabserver.com.pem'

• Now when you run puppet agent -t on the host2 node, it will show that it is recognised by the puppet server, in this case puppet1.mylabserver.com