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Performing advanced Custom File Integrity Operator tasks

Reinitializing the database

If the File Integrity Operator detects a change that was planned, it might be required to reinitialize the database.

Procedure

  • Annotate the FileIntegrity custom resource (CR) with file-integrity.openshift.io/re-init:

    $ oc annotate fileintegrities/worker-fileintegrity file-integrity.openshift.io/re-init=

    The old database and log files are backed up and a new database is initialized. The old database and logs are retained on the nodes under /etc/kubernetes, as seen in the following output from a pod spawned using oc debug:

    Example output
     ls -lR /host/etc/kubernetes/aide.*
-rw-------. 1 root root 1839782 Sep 17 15:08 /host/etc/kubernetes/aide.db.gz
-rw-------. 1 root root 1839783 Sep 17 14:30 /host/etc/kubernetes/aide.db.gz.backup-20200917T15_07_38
-rw-------. 1 root root   73728 Sep 17 15:07 /host/etc/kubernetes/aide.db.gz.backup-20200917T15_07_55
-rw-r--r--. 1 root root       0 Sep 17 15:08 /host/etc/kubernetes/aide.log
-rw-------. 1 root root     613 Sep 17 15:07 /host/etc/kubernetes/aide.log.backup-20200917T15_07_38
-rw-r--r--. 1 root root       0 Sep 17 15:07 /host/etc/kubernetes/aide.log.backup-20200917T15_07_55

    To provide some permanence of record, the resulting config maps are not owned by the FileIntegrity object, so manual cleanup is necessary. As a result, any previous integrity failures would still be visible in the FileIntegrityNodeStatus object.

Machine config integration

In OpenShift Container Platform 4, the cluster node configuration is delivered through MachineConfig objects. You can assume that the changes to files that are caused by a MachineConfig object are expected and should not cause the file integrity scan to fail. To suppress changes to files caused by MachineConfig object updates, the File Integrity Operator watches the node objects; when a node is being updated, the AIDE scans are suspended for the duration of the update. When the update finishes, the database is reinitialized and the scans resume.

This pause and resume logic only applies to updates through the MachineConfig API, as they are reflected in the node object annotations.

Exploring the daemon sets

Each FileIntegrity object represents a scan on a number of nodes. The scan itself is performed by pods managed by a daemon set.

To find the daemon set that represents a FileIntegrity object, run:

$ oc -n openshift-file-integrity get ds/aide-worker-fileintegrity

To list the pods in that daemon set, run:

$ oc -n openshift-file-integrity get pods -lapp=aide-worker-fileintegrity

To view logs of a single AIDE pod, call oc logs on one of the pods.

$ oc -n openshift-file-integrity logs pod/aide-worker-fileintegrity-mr8x6
Example output
Starting the AIDE runner daemon
initializing AIDE db
initialization finished
running aide check
...

The config maps created by the AIDE daemon are not retained and are deleted after the File Integrity Operator processes them. However, on failure and error, the contents of these config maps are copied to the config map that the FileIntegrityNodeStatus object points to.