Puppet run on the Satellite client shows the `Debug: Failed to load library msgpack for feature msgpack` debug message.

Environment

• Red Hat Satellite 6

Issue

• The following debug message is observed during puppet run on the client registered with Satellite server.

  # puppet agent --test --debug|grep msgpack
  Debug: Failed to load library 'msgpack' for feature 'msgpack'
  Debug: Puppet::Network::Format[msgpack]: feature msgpack is missing
  Debug: Failed to load library 'msgpack' for feature 'msgpack'
  Debug: Puppet::Network::Format[msgpack]: feature msgpack is missing
  

Resolution

• Install the rubygem-msgpack package which will remove the mentioned debug message.

  # yum install rubygem-msgpack
  

• To use the msgpack, add the following line in [main] or [agent] section of puppet.conf file.

  preferred_serialization_format =  msgpack
  

• The debug message is harmless and it only fills up the logs.

For more KB articles/solutions related to Red Hat Satellite 6.x Puppet Issues, please refer to the Red Hat Satellite Consolidated Troubleshooting Article for Red Hat Satellite 6.x Puppet Issues

Root Cause

• The msgpack is an efficient serialisation format used by puppet when communicating between master and agent. This format requires rubygem-msgpack package, which if not installed will give the mentioned debug message.

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