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12.3. Enabling Encryption for an Existing Container Native Storage Setup

You can configure network encryption for an existing Container Native Storage setup for both I/O encryption and management encryption.

12.3.1. Enabling I/O encryption for a Volume

Enable the I/O encryption between the servers and clients for a volume:

Note

The servers are the OpenShift nodes on which Red Hat Gluster Storage pods are running.
The clients are the remaining OpenShift nodes on which Red Hat Gluster Storage is not running.
  1. Stop all the application pods that have the Red Hat Gluster Storage volumes.
  2. Stop the volume. 
    # oc rsh <gluster_pod_name> gluster volume stop VOLNAME
    The gluster pod name is the name of one of the Red Hat Gluster Storage pods of the trusted storage pool to which the volume belongs.
  3. Set the list of common names for clients allowed to access the volume. Be sure to include the common names of all the servers. 
    # oc rsh <gluster_pod_name> gluster volume set VOLNAME auth.ssl-allow 'server1,server2,server3,client1,client2,client3'

    Note

    If you set auth.ssl-allow option with * as value, any TLS authenticated clients can mount and access the volume from the application side. Hence, you set the option's value to * or provide common names of clients as well as the nodes in the trusted storage pool.
  4. Enable client.ssl and server.ssl on the volume. 
    # oc rsh <gluster_pod_name> gluster volume set VOLNAME client.ssl on
# oc rsh <gluster_pod_name> gluster volume set VOLNAME server.ssl on
  5. Start the volume. 
    # oc rsh <gluster_pod_name> gluster volume start VOLNAME
  6. Start the application pods to use the I/O encrypted Red Hat Gluster Storage volumes.

12.3.2. Enabling Management Encryption

Though, Red Hat Gluster Storage can be configured only for I/O encryption without using management encryption, management encryption is recommended. On an existing installation, with running servers and clients, schedule a downtime of volumes, applications, clients, and other end-users to enable management encryption.
You cannot currently change between unencrypted and encrypted connections dynamically. Bricks and other local services on the servers and clients do not receive notifications from glusterd if they are running when the switch to management encryption is made.
  1. Stop all the application pods that have the Red Hat Gluster Storage volumes.
  2. Stop all the volumes. 
    # oc rsh <gluster_pod_name> gluster volume stop VOLNAME
  3. Stop the Red Hat Gluster Storage pods. 
    # oc delete daemonset glusterfs
  4. On deletion of daemon set the pods go down. To verify if the pods are down, execute the following command: 
    # oc get pods
  5. Create the /var/lib/glusterd/secure-access file on all OpenShift nodes. 
    # touch /var/lib/glusterd/secure-access
  6. Create the Red Hat Gluster Storage deamonset by executing the following command: 
    # oc process glusterfs | oc create -f -
  7. On creation of daemon set the pods are started. To verify if the pods are started, execute the following command: 
    # oc get pods
  8. Start all the volumes. 
    # oc rsh <gluster_pod_name> gluster volume start VOLNAME
  9. Start the application pods to use the management encrypted Red Hat Gluster Storage.
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