IBMi.org – Bart's blog

IBM i and PowerVM features and tools

Monthly Archives: February 2014

How to restrict usage of ssh keys for specific hosts only.

In this post I would like to show you how to restrict a ssh connection for a specific host only.

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viosvrcmd – the backdoor to the PHyp?

The title is provocative, but if we agree that Virtual I/O Server is part of the POWER Hypervisor it’s absolutely true. The command viosvrcmd is a HMC command which allows to perform any non-interactive VIO commands by a HMC user which has the taskrole authority – ‘VirtualIOServerCommand’ and visibility to a VIOS LPAR without be prompting for VIOS user and password.

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