Category archives: ACM

All Things related to systems and lab administration at the JHU ACM

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(This post is related to the ACM cluster build.  However, it is really generic systems stuff and not terribly related to the actual cluster build.  It is much more closely related to quirks of JHU networking.)

The Problem

JHU has two distinct networks - firewalled and firewall-free.  (In truth there are more and there are ...

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So I've mentioned that I've been fighting networking again in the ACM cluster.  I've been reworking the network.  This whole adventure began after a conversation with the very knowledgeable nwf, who pointed out that JHU runs two different networks that the ACM systems need access to - CSNet (the JHU Computer Science department ...

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As part of my ACM cluster creation obsession, I wanted to make the Cisco 2900XL switches we have autoconfigure.  I'm not terribly familiar with how these switches operate and, rather than reconfigure all of them at once, I'd much rather be able to reboot (reload, in cisco parlence) them and have them come ...

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In part 3 of this series, we got the management node set up to route traffic and generally properly configured.  Now its time to actually install xCat!

Choices

Many xCat guides recommend downloading the RPMs and manually installing those.  The benefit of this route is that you need no network connection to your management node for this ...

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In part 2 of this series, I covered the network design - the last theoretical piece of design we need.  Now let's do some practical stuff!  In this section I'm going to cover base network setup and keepalived installation on the management node.

Prerequisites

For this I've assumed you already have a set ...

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Welcome to part 2 of my series of posts on building the ACM VM cluster!  Part 1 covered the hardware and software that will be used in the cluster.  Part 2 is going to focus on network design.

Introduction

Typically in clusters there are two networks (usually represented by IP ranges, though sometimes actually ...

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So I have a vision for the ACM systems - I'd like to make it so we are as redundant as possible and we can do updates to systems without having to take them offline.  The obvious answer to this is using VMs, in a cluster.  Fortunately, the ACM recently received a donation of the old DLMS ...

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I intended to make the first post here be about the technology under the site and how to set up a similar site.  I will still write that one, but in the meantime a much more interesting problem has come up and I wish to share it with you.

This post is about the various ...

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