In this post I would like to show you how to restrict a ssh connection for a specific host only.
Continue reading “How to restrict usage of ssh keys for specific hosts only.”
Category: VIOS
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.
Live Partition Mobility on IBM i – step by step
It’s pretty new feature on IBM i, for AIX its availably since 2007. In VMware world its called VMotion. In my opinion it is still not very popular. Software vendors must still adopt their software for seamless migrations. But IBM gave us a technology which works very well.
Continue reading “Live Partition Mobility on IBM i – step by step”
VIOS commands from IBM i point of view
Many IBM i administrators do afraid a VIOS shell. Yes, its different, completely different what we know from IBM i interface. In this post I want to show you a few commands which you know from a ‘green screen’ against its equivalent in a VIOS shell.
Managing the Virtual Media Repository
Virtual media repository is very useful PowerVM feature. Some older IBM i administrators probably remember similar function available in iSeries ages ago. In short way, it allows to share CD/DVD images on a frame/server layer.
I use it very often, because it allows load a SLIC without physical access to a server. Practically you can install an IBM i OS, on completely new POWER server, which doesn’t even have a physical CD/DVD drive.
In this post I’d like to show different methods how to manage the Virtual Media Repository. Continue reading “Managing the Virtual Media Repository”
Backing up a VIOS to an IBM i
If an administrator run a VIOS within IBM i environment only, he needs to do backups anyway.
The most efficient way how to do it, is perform backups to a NFS file system exported by an IBM i .
Changing WWPN of a virtual fiber adapter
You’ve probably noticed WWPNs are automatically generated by a HMC. But you might get to the point when you need specific World Wide Port Name. Each HBA must have an unique number. That’s why IBM didn’t give us a choice, and generates these strings automatically. First few characters (C050760….) define a virtual resource. The rest of the string is unique. A serial number of a console is used to generate distinctive identifier. The problem is when you do some maintenance work, and you lost your ‘old’ WWPN, or you need to migrate to a different VIOS. In most situation you can reconfigure your SAN infrastructure. But if you need to keep a WWPN, you can explicitly set it from a HMC command line. Continue reading “Changing WWPN of a virtual fiber adapter”
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