How secure is data in a OpenVZ container?

I want to discuss data security/access from outside in OpenVZ containers.

Can the node admin access data that is inside a container? Is there any way to prevent this? Can the admin spy on data in ram from the container or is it encrypted (by OpenVZ) ?

Mounting an encrypted FS container is not really ideal because it has to be mounted manually after each restart, or is there a way to automount without storing the PW locally?

Any advise to secure / encrypt data is welcome.

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