Satellite installer fails with docker manifest error

Environment

Satellite 6.6

Issue

Running satellite-installer fails with

/usr/share/gems/gems/kafo-3.0.0/lib/kafo/puppet_module.rb:69:in `parse': No Puppet module parser is installed and no cache of the file /usr/share/foreman-installer/modules/foreman/manifests/plugin/docker.pp is available. Please check debug logs and install optional dependencies for the parser. (Kafo::ParserError)

Resolution

Please remove or comment out the following line in the answer files (foreman-answers.yaml, satellite-answers.yaml or any other where the line is present):

foreman::plugin::docker: false

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

Root Cause

Foreman docker plugin is deprecated and not used anymore.

Diagnostic Steps

The following logs are present in the installer log:

root@satellite.example.com:~satellite-installer --scenario satellite                         --certs-server-cert "/root/sat_cert/satellite_cert.pem"                         --certs-server-key "/root/sat_cert/satellite_cert_key.pem"                         --certs-server-ca-cert "/root/sat_cert/ca_cert_bundle.pem"                         --certs-update-server --certs-update-server-ca
/usr/share/gems/gems/kafo-3.0.0/lib/kafo/puppet_module.rb:69:in `parse': No Puppet module parser is installed and no cache of the file /usr/share/foreman-installer/modules/foreman/manifests/plugin/docker.pp is available. Please check debug logs and install optional dependencies for the parser. (Kafo::ParserError)
        from /usr/share/gems/gems/kafo-3.0.0/lib/kafo/configuration.rb:96:in `block in modules'
        from /usr/share/gems/gems/kafo-3.0.0/lib/kafo/configuration.rb:96:in `map'
        from /usr/share/gems/gems/kafo-3.0.0/lib/kafo/configuration.rb:96:in `modules'
        from /usr/share/gems/gems/kafo-3.0.0/lib/kafo/configuration.rb:214:in `params'
        from /usr/share/gems/gems/kafo-3.0.0/lib/kafo/configuration.rb:224:in `preset_defaults_from_puppet'
        from /usr/share/gems/gems/kafo-3.0.0/lib/kafo/kafo_configure.rb:285:in `set_parameters'
        from /usr/share/gems/gems/kafo-3.0.0/lib/kafo/kafo_configure.rb:100:in `initialize'
        from /usr/share/gems/gems/clamp-1.1.2/lib/clamp/command.rb:132:in `new'
        from /usr/share/gems/gems/clamp-1.1.2/lib/clamp/command.rb:132:in `run'
        from /usr/share/gems/gems/kafo-3.0.0/lib/kafo/kafo_configure.rb:163:in `run'
        from /usr/sbin/satellite-installer:8:in `<main>'

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