Upgrade Puppet Server

Upgrade Puppet Server to adopt features and functionality of newer versions.

Upgrading the puppetserver package effectively upgrades Puppet Server. The puppetserver package, in turn, depends on the puppet-agent package, and your node’s package manager automatically upgrades puppet-agent if the new version of puppetserver requires it.

Important: During an upgrade, Puppet Server doesn't perform its usual functions, including maintaining your site's infrastructure. If you use a single primary server, plan the timing of your upgrade accordingly and avoid reconfiguring any managed servers until your primary server is back up. If you use multiple load-balanced servers, upgrade them individually to avoid downtime or problems synchronizing configurations.

On your Puppet Server node, run the command appropriate to your package installer:
Yum:
```
yum update puppetserver
```
Apt:
```
apt-get update
apt-get install --only-upgrade puppetserver
```
If you pinned Puppet packages to a specific version, remove the pins.

For yum packages locked with the versionlock plugin, edit /etc/yum/pluginconf.d/versionlock.list to remove the lock.
On apt systems, remove .pref files from /etc/apt/preferences.d/ that pin packages, and use the apt-mark unhold command on each held package.
After upgrading the puppet-agent package, make sure to restart the puppetserver service.