explicitely document how to run puppet everywhere

howto/puppet.md

@@ -363,6 +363,19 @@ As a bonus, this query will show the number of hosts running each release:
  [PuppetDB API]: https://puppet.com/docs/puppetdb/4.3/api/index.html
  [fact API]: https://puppet.com/docs/puppetdb/4.3/api/query/v4/facts.html
 
+## Running Puppet everywhere
+
+There are many ways to [run a command on all hosts (see next
+section)][], but the TL;DR: is to basicaully use [cumin](howto/cumin)
+and run this command:
+
+[run a command on all hosts (see next section)]: #batch-jobs-on-all-hosts
+
+    cumin -o txt -b 5 '*' 'puppet agent -t'
+
+But before doing this, consider doing a [progressive
+deployment](#progressive-deployment) instead.
+
 ## Batch jobs on all hosts
 
 With that trick, a job can be ran on all hosts with