When a system is connected to the Internet, handed over to customers, or otherwise placed in an uncontrolled environment, there is a risk that the server may get compromised. Linux servers are no exception to this. Proper security policies, internet firewalls, and packet filtering all act to minimize this risk and impact. When running Linux servers as z/VM guests, we also need to consider interactions between the Linux virtual machines and the z/VM host. As this type of interaction is not limited to network connectivity, firewalls are less effective in controlling it. The purpose of this paper is to provide guidance in hardening a z/VM system to run Linux virtual machines in a hostile environment.
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