Archives For ewan

kafka logoI couldn’t find an Apache Kafka Visio stencil, so I’ve created one myself from the Kafka logo.

It’s available here: Apache Kafka Visio stencil

Just download the zip file and copy the stencil file inside it to “My Documents\My Shapes” in your user directory, and it should automatically appear inside Visio’s “My Stencils” section. If you run into any problems or have any suggestions, let me know in the comments below.

The AWS CLI run-instances documentation isn’t great on how to assign a public IP Address in a VPC when you create a new instance, so this is a quick note on how to do it.

There’s a bug report on Unable to use –associate-public-ip-address but the fix mentioned isn’t very clear on the formatting, but this command line works:

aws ec2 run-instances --image-id ami-f0b11187 --key-name your-ssh-key-name --instance-type t2.micro --network-interfaces '[ { "DeviceIndex": 0, "Groups": ["sg-123456"], "SubnetId": "subnet-123456", "DeleteOnTermination": true, "AssociatePublicIpAddress": true } ]'

You obviously need to change the “Groups” value to a valid security group in your own VPC, and SubnetID to a subnet-id in your VPC (plus pick the right AMI for image-id), but after that you will be able to create an instance with a public IP!

Technology, however good it is, will never give you a strategy, IT or otherwise, and your choice of a particular piece of technology over another is not a strategic decision.

I see this a lot recently in articles and blog posts.

Not IT Strategy

  • “We have containers as part of our IT strategy”
  • “VMware vSphere is our strategic platform”
  • “Embracing Java for development is our strategy”
  • “Our strategy is to move to micro-services”

These may all be sound technology choices, but they are reflections of strategic choices, not strategic decisions themselves.

The strategic decisions are things like the ones below

IT Strategy

  • Any IT systems that are revenue generating for the company will be developed in-house, to ensure we control our own destiny
  • We will move to an IT brokerage model, where business users will be directed to external suppliers for engagement of any required applications or services
  • Where a suitable option is available, all our existing and new applications will be migrated to an external SaaS platform

From these strategic decisions (and these are still fairly tactical in my mind), you will end up making a series of technical decisions, but please don’t confuse them for strategy themselves.

IT Strategy Outcomes

  • We use CloudFoundry, because we are rapidly switching to “Web-scale” application and operational models, and this choice accellerates and eases the transition
  • We use VMware vSphere, because we want to minimise the impact, and maximise the capabilities when transitioning from the legacy IT model of 1 server for 1 application, to a newer approach where hardware and software are decoupled
  • We keep much of our software development in-house to give us a competitive advantage over our competitors who use off-the-shelf packages, and needed a standard language in place to maximise code-reuse

If you remember one simple thing about technology and IT strategy, make it this:

If you mention a piece of technology, it’s almost certainly not strategy.