After Satellite 6.4 to 6.5 upgrade, "Something went wrong when retrieving the resource" when trying to view some Content Hosts.

Environment

• Red Hat Satellite 6.5
• Red Hat Satellite 6.6

Issue

• After upgrading from Satellite 6.4 to Satellite 6.5 successfully, seeing the below error when trying to view some Content Hosts :-

Something went wrong when retrieving the resource.

• The production.log shows the below error followed by a traceback :-

ActionView::Template::Error: undefined method `split' for nil:NilClass
/usr/share/foreman/app/models/nic/base.rb:90:in `type_name'
/usr/share/foreman/app/views/api/v2/interfaces/main.json.rabl:9:in `block in eval_source'
/opt/theforeman/tfm/root/usr/share/gems/gems/rabl-0.13.1/lib/rabl/builder.rb:152:in `node'
/opt/theforeman/tfm/root/usr/share/gems/gems/rabl-0.13.1/lib/rabl/builder.rb:114:in `block in compile_settings'
/opt/theforeman/tfm/root/usr/share/gems/gems/rabl-0.13.1/lib/rabl/builder.rb:113:in `each'

Resolution

IMPORTANT: Take a snapshot of the Satellite VM before making any of the following changes.

• The NIC information for some of the Content Hosts is missing after the upgrade, and this needs to be rectified.

• Execute the below command on the Satellite :-

# foreman-rake console
> Nic::Base.where(:type => ['Nic::Base', nil]).map{|i| i.update_column(:type, "Nic::Managed")}
> exit

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

• The Content Hosts for which the error is seen has been missing the NIC information.

Diagnostic Steps

• The /var/log/foreman/production.log file contains the detailed traceback which includes one of the Host IDs for which the NIC information is missing.
  E.g. In the below tracback the host with ID 108 is one of the problematic hosts :-

Processing by Api::V2::HostsController#show as JSON
[I|app|f228c819]   Parameters: {"apiv"=>"v2", "id"=>"108"}
2019-07-03T08:04:51 [I|app|] Started GET "/layouts/two-column-details.html" for <IP> at 2019-07-03 08:04:51 -0700
2019-07-03T08:04:51 [I|app|f228c819]   Rendered api/v2/hosts/show.json.rabl (160.8ms)
2019-07-03T08:04:51 [W|app|f228c819] Action failed
ActionView::Template::Error: undefined method `split' for nil:NilClass

• Trying to view the host information with hammer too results in the same error :-

# hammer host info --id=108
undefined method `split' for nil:NilClass

• List the NIC information for all the hosts with the below command, and check for the host with ID 108 :-

# echo "Nic::Base.pluck(:host_id, :type, :name)" >> query; foreman-rake console < query > interfaces.txt ; rm -rf query

The non-problematic hosts appear as :-

[190, "Nic::Managed", "<hostname_1>"]

The problematic hosts appear as :-

[180, nil, "<hostname_2>"]

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