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Bug 1818086

Summary: [RFE] MCD should be blocking + warning on MachineConfigs that are trying to mount files as directories
Product: OpenShift Container Platform Reporter: Micah Abbott <miabbott>
Component: Machine Config OperatorAssignee: Antonio Murdaca <amurdaca>
Status: CLOSED NOTABUG QA Contact: Michael Nguyen <mnguyen>
Severity: low Docs Contact:
Priority: low    
Version: 4.5CC: smilner, wking
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Target Release: 4.5.0   
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Last Closed: 2020-05-20 17:44:07 UTC Type: Bug
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Description Micah Abbott 2020-03-27 16:07:28 UTC 
In BZ#1746968 and BZ#1817769, there was a fluentd DaemonSet that was configured to mount in `/etc/hostname` to a pod, but was incorrectly trying to mount it as a directory.

We had discussions in Slack about how to prevent this and it was suggested that the MCO could be of help.

Things that would be nice to have:
  - MCO blocks any MachineConfig that tries to mount `/etc/hostname` as a directory
  - MCO warns when an MC tried to do the same
  - MCO gains ability to do this for any file that is trying to be mounted as a directory

In the case of the `fluentd` DS, I'm not even sure that the MCO could detect the misconfiguration.  However, putting these kinds of protections in place may prevent potential problems in the future.
Comment 2 Steve Milner 2020-05-20 17:44:07 UTC 
Closing as this is an RFE and not a bug. This can be added in Jira for future enhancement.