Use pxctl with security enabled

Once a storage cluster with security enabled is running, a cluster admin must set up a pxctl context on each node in order to interact with the system.

The following steps will guide an operator-based storage admin to setup pxctl contexts on each node:

1. Retrieve the admin token from the namespace in which Portworx was installed and store it in a variable ADMIN_TOKEN:

   ADMIN_TOKEN=$(kubectl -n kube-system get \
     secret px-admin-token -o json \
   | jq -r '.data."auth-token"' \
   | base64 -d)

2. Find the portworx pod which is running on the node in which the admin wants to interact with:

   kubectl -n kube-system get pods -l name=portworx -o wide

   Copy the desired portworx pod for the next command.

3. Save the admin token in the pxctl context for that pod:

   kubectl -n kube-system exec -ti <portworx_pod> -- /opt/pwx/bin/pxctl context create admin --token=$ADMIN_TOKEN

4. Exec into the portworx container to perform any pxctl commands:

   kubectl -n kube-system exec -ti <portworx_pod> /bin/bash