Category Archives: Virtualisation


My DockerCon Europe agenda

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I’ve spent quite a bit of time recently familiarising myself with the ‘cloud native’ landscape (blog posts are in draft format and will hopefully get finished one day soon) and to that end I’m attending DockerCon Europe next week to immerse myself even further.  I’m going to be a fish out of water!  I’m used to attending VMworld where I know the technology and a large number of people whereas I only know a couple of people attending and only have a passing familiar with many of the technologies and vendors. Given the energy around the container space I’m envisaging an overwhelming experience like my first VMworld six years ago. You can view my full agenda online but there are a couple of sessions I’m particularly keen to attend.

The first is ‘cgroups, namespaces, and beyond: what are containers made from?‘ which promises a deep dive into container structure along with a comparison of different container runtimes. I’ve read about alternatives LXC, rkt, & systemd-nspawn a bit  and it’s particularly relevant to me as VMware’s container initiative, vSphere Integrated Containers, goes about creating the container using hypervisor mechanisms rather than Linux kernel primitives. Being able to articulate the rationale and benefits of this to VMware customers will be key. Incidentally for those who attended VMworld this year there was a great session all about it – INF5229 – Docker and Fargo: Exploding the Linux Container Host.

Another session which should have some lively debate is live migrating a container: pros, cons, and gotchas (a concept I tweeted about back in April). The obvious question is always ‘why would you want to do that? containers are stateless and immutable – deploy and destroy!’ but the naysayers would claim that containers will also be used to deploy stateful applications in which case this is a must have feature (just as vMotion is nowadays). The presenter is the maintainer of the CRIU project and also works for Odin whose product manages both VMs and containers (so they have both expertise and a desire for it to work!).

Hopefully I’ll follow up with a blogpost detailing my thoughts after the event. If you’re attending get in touch – it’d be nice to see a friendly face!

VMware certification exams – 25% discounts (2015 offer)

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Igreenf you’re in the market to take a VMware certification exam, there’s some good news – provided you’re quick. For the next couple of days (while VMworld US is running, August 30th-4th September 2015) you can book VCP and VCAP/VCIX exams at a cool 25% offeven if you’re not at the conference! Like last year it’s only 25% (in earlier years it was 50% and if you’re attending the conference in person it still is) but every little helps.

Sadly the period of time to actually sit the exam has been shortened (see below) compared to previous years but if you want to blitz multiple certification tracks you can – you’re not limited to just one.

The codes you need to register with are;

  • VCPWDF25 – for the VCP exams (VCP-DCV, VCP-DT, VCP-Cloud/CMA, VCP-NV)
  • VCPADWDF25 – for the VCAP exams (VCAP-DCA, VCAP-DCD, VCIX-NV)


  • You MUST book the exam while VMworld US is running, 30th August to 4th September 2015. You don’t have to be attending the conference, it’s just the period of time the offer is valid.
  • You MUST take the exam by October 15th, 2015

What are you waiting for? Head over to VMware Certification and get registered certification junkies!

Chromecast causing wifi interference – resolved

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Summary: I’ve found Google’s Chromecast to be a great streaming device but in rare cases it can misbehave and cause wireless access issues.

I bought my first Chromecast the day they were released in the UK (March 18th 2014), totally by chance, and I’m a big fan. Once setup they’re simple enough to use that my 2yr old son can now use a tablet to power on our TV and watch a program of his choosing via BBC iPlayer or Plex without any help from me – and that’s something my in-laws can’t manage. I’m not sure it’s socially a good thing but at least the technology works!

Chromecast wifi analyzerHowever I have noted a few issues, notably with their use of wifi. When you first plug in the Chromecast it’s in ‘master’ mode which means it acts as an access point, thus allowing you to join its wireless network with a tablet and configure it (and also opening up at least one vulnerability). Once the initial setup is complete however it’s supposed to go into ‘managed’ mode which means it should stop being an access point and act only as a wireless client but mine was still intermittently acting as an AP and therefore causing interference, as seen by Wifi Analyser (highly recommended by the way). In my case (and for others too) I saw additional wifi signals, always on the same channel as my home wifi, and the signal strength was greater than my home wifi when I was near the Chromecast. The Chromecasts didn’t broadcast an SSID (it showed as ‘?’ in Wifi Analyser) with a MAC address starting in fa:86:ca, which belongs to Google (although none of the OUI lookup databases seemed to know it).

This useful article about how Chromecast uses the Wifi network, including packet captures, goes into some possible causes although it’s been 18 months since the Chromecast was released and firmware updates may have resolved some issues mentioned.

How do I fix it?

The fix, at least for me, was a factory reset of the Chromecast – hardly worth of a blogpost! However I’d ‘reset’ mine several times by simply going into the Chromecast utility on an iPad (or Android tablet) and after a reboot I’d go through the setup again (inputting wireless password, naming the device etc) and that DIDN’T fix the issue. A factory reset can be done by holding down the power button on the Chromecast for 25 seconds until the light on the device flashes or via the Chromecast app (detailed walkthrough here).

It’s also worth checking that it’s running the latest firmware (31432 as of May 22nd 2015, according to Wikipedia) – it should update automatically (and in fact you can’t stop it doing so which isn’t ideal) but sometimes a factory reset gives it the kick up the proverbial it needs to update. If you need help the official Google Chromecast forum is a good place to start as is the online troubleshooting wizard.


A new challenge…joining VMware

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Summary: An unexpected career change!

I’m excited to announce that from late July I’m going to be joining VMware as a Senior Technical Marketing Engineer.  The role will be a change compared to all of my previous roles which have entailed operating infrastructure as an end user and more recently as a service provider whereas I’ll now be focused on marketing for a vendor, albeit from a technical perspective. I’m excited because my skillset has gravitated around VMware/virtualisation/cloud for quite a few years and this role will require knowledge of areas I’ve not previously been responsible for, in particular the 3rd platform (think cloud native applications, containers etc) and VMware’s competition.   I think it’s an interesting time to join VMware as the world of ‘cloud native applications’ finally seems to be meeting the enterprise infrastructure world via technologies like Docker and the relationship with Pivotal is becoming more, well, pivotal! Time will tell if VMware (or I) live up to expectations….my imposter syndrome is at an all time high right now. :-)

This job is only possible for me, living as I do on a remote island in the English channel, because I’ll be working remotely – which is a first for me and something I’m both looking forward to and concerned about. I’ve always enjoyed the social interaction in an office environment and building relationships remotely is a different experience – though one I think social media has prepared me well for. Time to soak up those home working/office blogposts!

As with everything in life there’s a compromise and obviously I’m compromising my independent viewpoint. It’s always been a luxury to have (almost) complete freedom of speech without company politics being a concern – as an end user I was largely free to say exactly what I felt, good or bad. However hard I try I don’t believe I can be ‘independent’ when all my focus (and livelihood) depends on improving VMware products – we all have biases – so blog disclaimer or not you’ll have to interpret anything I say through the lens of a vendor employee. To my friends who work for other vendors – let’s make sure our choice of employer doesn’t affect our relationship!

I still intend to engage fully with the community. It keeps me honest, keeps me learning, and is one of the most enjoyable parts of my career, even if I can no longer attend TechFieldDay events. If I can walk the line between corporate expectations and my personal thoughts, which very few seem to manage, I’ll be a happy man.

I’d like to take this opportunity to thank Sure International for a great year – if you happen to be in the Channel Islands you should check our their cloud solutions! Thanks for reading and hopefully this next step in my career will lead to more great content in the future.



Ed at InTechWeTrust podcast

InTechWeTrust episode 32 – Netapp, containers, AWS and more

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I recently attended the tech.unplugged event in London (my thoughts on it are here) and the London VMUG the following day, and was in the right place at the right time to take part in the InTechWeTrust podcast, episode 32. For those not familiar with this podcast it’s run by a prominent team of bloggers who have a background in enterprise infrastructure and has been going since last September. You can listen to the podcast directly via the player below or your usual choice of subscription (iTunes etc) – just head on over to the InTechWeTrust website for all the links.

Make sure you listen to the last 15 mins with EMEA CTO Joe Baguley – very interesting.

InTechWeTrust Episode 32 – Containers, Project Photon/Lightwave, AWS, Netapp, CoHo Data + more!

I’d like to use this blogpost to follow up on some of the topics discussed and my contributions.

...on ‘containers’. Sometimes I find myself speaking on a topic of which I’m by no means an expert – I try to avoid it as I’m all about facts, impartiality (as far as that’s possible) and I’m a believer that your reputation is sacrosanct (not just in the bloggersphere) but you can’t learn without getting out of your comfort zone. I’m not a developer. I have limited knowledge and minimal hands-on experience of containers. I have an understanding on where they fit into an overall architecture, who’s getting value from them, and at least an inkling of their potential but I’m clearly no expert. My comments about Docker building a platform (with an implied degree of vendor lock-in) vs Rocket’s ‘more open’ ambitions largely came from reading this blogpost from Rocket, this great Reddit thread discussing what it means, plus a good summary from GigaOm. Clearly this still needs to play out – the stakes are high and it’s going to be an interesting ride!
If anyone can point me to other resources with more information I’d be very grateful!

…on Photon/Lightwave/Photon. This was discussed with Joe Baguley after I’d left the podcast but the interesting soundbites for me were ‘a new direction for VMware’, the fact that containers are seen to be the boundary between VMware and Pivotal (hence why Photon/Lightwave are VMware yet Lattice is Pivotal), and the idea that containers may become embedded in vSphere itself. Interesting times!

…on Netapp. There’s been a recurring discussion about Netapp on the last few episodes and a good Linked-In discussion. I was a Netapp user for over five years (and I’ve written quite a few Netapp blogposts) and while I’ve not kept an eye on their latest releases I’ve always felt they weren’t vocal enough in the social media space, especially since Vaughn Stewart jumped ship to Pure Storage. This has improved with Nick Howell’s useful DatacentreDude blog and podcast but I still don’t see enough innovation. Flash, tiering, and scale out have all been addressed but never in a convincing way – the gravity of the core ONTAP OS seems all consuming. This would seem to be borne out in their upcoming layoffsAgain, happy to be educated otherwise!

…AWS finances. They’re now available – plenty of articles to digest. As predicted it made the mainstream BBC news, Simon Wardly waded in, and there’s a good Business Insider article with a great quote;

Amazon? The online bookstore that turned into a kind of Best Buy/Wal-Mart online? A giant of enterprise computing? No way.