RedHat / CentOS / CloudLinux 7

rpm -ivh https://yum.puppetlabs.com/puppetlabs-release-pc1-el-7.noarch.rpm
yum -y install puppet-agent
yum install redhat-lsb-core
/opt/puppetlabs/bin/puppet resource service puppet ensure=running enable=true

Ubuntu 16.04

wget https://apt.puppetlabs.com/puppetlabs-release-pc1-xenial.deb
sudo dpkg -i puppetlabs-release-pc1-xenial.deb
sudo apt-get update
sudo apt-get install puppet-agent
sudo systemctl enable puppet
sudo systemctl start puppet