In a previous article I discussed bridges and showed how the Linux utilities bridge-utils and iproute2 could be used to create virtual bridges within a system. This is great for simple set up but when deploying a cloud environment a bit more functionality is required and that’s where Open vSwitch comes in.Continue reading
I have a number of Ubuntu 14.04 virtual machines installed under VirtualBox running on Windows 8.1 and occasionally I find it useful to have the VirtualBox additions installed. Unfortunately for me the documented process doesn’t seem to work. Whenever I mount the ISO image using Devices –> Insert Guest Additions CD Image… I find that /media/cdrom is empty whereas you would expect to find the install script. This article explains how I install the additions.Continue reading
I recently started taking the Udacity course on Computer Networking and while it looks like a good course it suffers from the same problem all the Udacity courses seem to suffer from: really badly put together examples and quizzes. It’s a shame because the material itself is generally of a really high quality. The problem I hit here was after starting up the virtual machine they provide for learning against I found I didn’t have a connection to the Internet. The instructions mention putting the network adaptor into bridged mode but nothing about what to do if the adaptor doesn’t configure itself.Continue reading
If you are on Windows and need to “shell” into a Linux machine then PuTTY is the tool of choice. For password based logins it’s as simple as entering the IP address or name of the machine you want to connect to but for key based logins things get a little more complicated. This guide will show you how to generate a key pair and use it to quickly and efficiently log into a machine. The target machine that I will be logging into is a virtual machine living in an OpenStack cloud, by default these machines don’t allow password based login.Continue reading
For a couple of years now I’ve run a small VMWare virtualization system for my business. Broadly speaking it’s gone well and been fairly uneventful. The only panic came when I transitioned from the free to the small business version of the software – I installed more memory than was allowed in the free version, rather than just ignoring it the system refused to boot any VMs! Unfortunately I’ve never really had the time to fully explore what I could do with the system and I’ve long felt that there was more to be had. Rather than shell out more money on VMWare toys though I thought it was high time I learnt about OpenStack.
One of the servers I manage is currently running Ubuntu 12.04 (Precise Pangolin) but in a little over a month 14.04 (Trusty Tahr) will be making an appearance. Now there’s no good reason for me to be rushing out an upgrading but it’s got to be done at some point so I thought I’d get my hands on a nightly build of 14.04 to see what’s changed.Continue reading
I’ve been installing a new ESXi 5 based VMWare server recently. The machine contains an LSI MegaRAID 9260-4i RAID card and four decent sized disks. The host operating system installed fine and I thought everything was going well until I got almost to the point of completion when I went to check that error reporting was working. To my surprise there was no information available on the state of the RAID array.Continue reading
I recently installed Hyper-V on a spare machine to have a bit of a play with it and to find out if it would be suitable for a little virtualization I would like to do. Everything was going really well up to the point where I wanted to manage the server. For the life of me I couldn’t figure out how to start the Hyper-V manager.Continue reading