Docker clients are unable to connect to docker and app nodes show all pods in an "Unknown" status

Solution Verified - Updated -

Issue

  1. Docker service is running but clients are unable to connect to docker (e.g. docker ps)

    # docker ps
    Cannot connect to the Docker daemon. Is the docker daemon running on this host?
    
  2. All pods are in an "Unknown" state except for the Twistlock pod which is in a "NodeLost" state.

    $ oc get pods
    NAME                            READY  STATUS    RESTARTS  AGE
    twistlock-defender-ds-pfwq4     1/1    NodeLost  1         1d
    logging-fluentd-2-hnr22         1/1    Unknown   1         1d
    hawkular-cassandra-1-smb5r      0/1    Unknown   0         1d
    hawkular-metrics-kmrqs          0/1    Unknown   225       1d
    

Environment

OpenShift Container Platform

  • OpenShift Container Platform 3.7

Twistlock

  • Twistlock 2.2
  • Twistlock 2.3
  • Twistlock 2.4 (when using a blocking policy)

Twistlock is a self-certified partner of Red Hat.

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