While adding the second agent [node] to the puppet master encountered this error. https://inode-2-blocks.blogspot.com

1. Exiting; no certificate found and waitforcert is disabled
Error:
[root@redcent65 puppet-enterprise-3.1.0-el-6-x86_64]# puppet agent --test
Exiting; no certificate found and waitforcert is disabled
[root@redcent65 puppet-enterprise-3.1.0-el-6-x86_64]#
Cause:
[On the Agent: Check to see if there are any pending certification requests]
[root@redcent65 /]# cd /etc/puppetlabs/puppet/ssl/
[root@redcent65 ssl]# ls
certificate_requests certs private private_keys public_keys
[root@redcent65 ssl]# cd certificate_requests/
[root@redcent65 certificate_requests]# ls
redcent65.pem
[root@redcent65 certificate_requests]#
[Result: I found one certificate request as seen above]
Resolution:
1. On the Agent: Delete the pending cert(s):
[root@redcent65 /]# rm -rf /etc/puppetlabs/puppet/ssl/*
2. Re-run the 'puppet-agent test' to create and submit new cert to the master.
[root@redcent65 /]# puppet agent --test
Info: Creating a new SSL key for redcent65
Info: Caching certificate for ca
Info: Creating a new SSL certificate request for redcent65

2. Info: Certificate Request fingerprint (SHA256):
50:8D:F7:CD:23:C3:2B:28:A8:BE:C0:CA:F4:FE:97:7D:E9:61:1A:13:DD:B7:36:FB:16:6F:61:A2:A2:2A:63:35
[root@redcent65 /]#
3. On the Master: run 'puppet cert --sign --all"
[root@redhatcentos puppet-enterprise-3.1.0-el-6-x86_64]# puppet cert --sign --all
Notice: Signed certificate request for redcent65
Notice: Removing file Puppet::SSL::CertificateRequest redcent65 at
'/etc/puppetlabs/puppet/ssl/ca/requests/redcent65.pem'
[root@redhatcentos puppet-enterprise-3.1.0-el-6-x86_64]#
4. On the Agent: Re-run the puppet agent test.
[root@redcent65 /]# puppet agent --test
Info: Retrieving plugin
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/facter_dot_d.rb
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/puppet_vardir.rb
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/ip6tables_version.rb
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/windows.rb
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/puppetdb_server_status.rb
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/iptables_version.rb
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/concat_basedir.rb
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/custom_auth_conf.rb
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/iptables_persistent_version.rb
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/pe_version.rb
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/root_home.rb
Info: Loading facts in /var/opt/lib/pe-puppet/lib/facter/postgres_default_version.rb
Info: Caching catalog for redcent65
Info: Applying configuration version '1386270074'
Notice: Finished catalog run in 0.16 seconds
[root@redcent65 /]#

3. 5. On the Master: Refreshing the page should make the agent Node show-up as shown in the figure
below.
Note: I ran into this issue while adding the second agent (node) and found the solution googling.
Information & Download:
http://info.puppetlabs.com/download-pe-3-1.html?
Documentation:
http://docs.puppetlabs.com/pe/latest/overview_whats_new.html
Demos, Case Studies, White papers:
http://puppetlabs.com/resources/overview-2

4. So what is Puppet [http://puppetlabs.com]?
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.
In short: Puppet is an open source configuration management tool to manage the configuration of Unixlike and Microsoft Windows systems.
For quick video:
http://www.youtube.com/watch?v=j8ImF23jZAg&feature=player_embedded
Is it free [as in open source] or commercial?
Puppet is available as both open source and commercial software. For the difference between the two,
please read the following article:
http://puppetlabs.com/puppet/enterprise-vs-open-source
FAQ:
http://puppetlabs.com/puppet/faq
How did I discover this software?
Well, that's interesting, until yesterday I had no clue about this software at all. I was basically browsing
jobs on the job sites and came across a term called 'puppet' and that led me to puppetlabs.com 
It's users as per Wikipedia:
Puppet is used by the Wikimedia Foundation,[5] ARIN, Reddit,[6] Dell, Rackspace, Zynga, Twitter, the
New York Stock Exchange, PayPal, Disney, Citrix Systems, Oracle, Yandex, the University of North Texas,
the Los Alamos National Laboratory, Stanford University, Lexmark and Google, among others.[7]
ashwinwriter@gmail.com