Puppet out of sync in foreman

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The phrase "Out of sync" in Foreman means that no config management reports have been received within the past puppet_interval (30 mins or so). You should be trying to determine if reports are being sent and that they're showing in Foreman, and if not, whether there's an error or config issue on either the agent or master preventing their upload.

Remember: reports are sent from the agent to the master at the end of a run, then from the master to Foreman via a report processor (script).

1. Are reports listed for the host? When was the last report? Are new reports being stored, but under a different hostname? Look at incoming reports under Monitor > Reports > Config management in the UI, and deselect the default eventful = true search at the top to see all reports.
2. Is the Puppet agent running? Is it actually applying a catalog every 30 minutes? Check its log file, usually syslog (/var/log/messages, /var/log/syslog etc.) to check it's running regularly. Does it report in if you run puppet agent -t?
3. Is the agent logging any errors that may prevent a report being uploaded?
4. Are any report upload requests reaching Foreman? tail -f /var/log/foreman/production.log during an agent run and look for POST "/api/reports", which should finish with Completed 201 Created.
5. Does the master log any errors? The Puppet master typically logs to syslog again, or if using Puppet Server, under /var/log/puppetlabs/.