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Why Would I Want To Containerise My Life? Scott Coulton, Health Direct

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Audience: Beginner – Intermediate

About: In today’s world of agile IT containers have become the new buzz word just like cloud was a few years back. Why would we move our applications to containers? What is the business and operational enhancements can I expect? What are some real world problems with using containers in anger?

Speaker Bio: Scott Coulton – DevOps Solution Architect, Health Direct

Scott Coulton is a solutions architect with 10 years of experience in the managed services and hosting space. He has extensive experience in architecture, and rolling out systems and network solutions for national and multinational companies with a wide variety of technologies, including AWS, Puppet, Docker, Cisco, VMware, Microsoft and Linux. His design strengths are in cloud computing, automation and the security space.

OpenStack Australia Day - Sydney 2016
http://australiaday.openstack.org.au/sydney-2016/

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Why Would I Want To Containerise My Life? Scott Coulton, Health Direct

  1. 1. Why containerise your life ?
  2. 2. The agenda ● So you decided to use containers ● The pitfalls of starting to use containers ● We have the solution to that problem ● Is this ready for production ?
  3. 3. Have you ever danced with the devil in the pale moonlight ?
  4. 4. The devil does not change, he changes you Quote “The Joker, Batman 1989” This quote is so relevant when starting out with containers. If you want to be successful you have to change the way you think about solutions, your operational processes and CD/CI pipelines. Trying to fit old solution methodology will cause you technical debt.
  5. 5. So you decided to use containers
  6. 6. Where do you start ? So there is a lot of buzz around containers at the moment. So why should you spend the time and money to move your applications to containers ? We will answer this question from three different perspectives ● The Dev ● Infrastructure ● The business
  7. 7. The dev Why would Dev’s want to use containers ? ● Quick build times ● Run code locally that is the same code as production ● More efficient unit test cycles ● The container becomes the artifact ● Makes the CD/CI process simple
  8. 8. Infrastructure So what about the infra guys and girls ? ● The application is abstract from the host operating system ● In true ‘devops’, it’s infra as code ● It creates a collaborative environment ● Brings down operational overhead ● Makes the CD/CI process simple
  9. 9. The business It’s all about the bottom dollar, so how do we justify the change ● Collaboration breeds efficiency ● Increased quality of releases ● Containers are platform agnostic ● Language agnostic
  10. 10. Where do we start Now we see the benefits, where do we start ? ● Pick a small application or service ● Make sure it works ● Gain business trust
  11. 11. The pitfalls of starting to use containers
  12. 12. It can’t be all fairy floss and rainbows Now we have a few ideas of services or apps to containerise. What real world issues will come up. ● Do we run 1 container per compute resource ● Where does our data or state reside ● How do we handle failures ● What about the way my data is structured
  13. 13. Do we run 1 container per compute resource ? If we run containers 1:1 with compute resources what’s the point ? ● So we need a solution to scale That word ‘scale’ needs to be defined ● Are we talking on the same compute resource ● Does this mean across AZ’s ● What about completely different datacentres What about application routing within a compute resource ?
  14. 14. Where does our data or state reside ? Containers and stateless services are like a mirage in heaven. Unfortunately not all applications can be stateless. So how do we handle this ? ● Should the data live inside the container ● Maybe map a drive to the compute resource ● Can we split the compute from the state
  15. 15. How do we handle failures What happens to application failure within a container ? ● How can we design for failure ● What measures can we put in place to prevent failure ● Can we auto heal containers
  16. 16. How do I structure my data There are so many moving parts to building an image, creating the container and the release process. ● What configuration lives where ● How can I test my container ● With so many parts what does my source control structure look like
  17. 17. We have the solution to that problem
  18. 18. This is how we scale So let’s define scale !!! For the same for the same compute node we have to following options ● Docker Compose https://docs.docker.com/compose/
  19. 19. This is how we scale For more complex scaling needs like across multiple compute nodes or AZ’s. We would use a container scheduler. ● Docker Swarm https://docs.docker.com/swarm/ ● Google’s Kubernetes http://kubernetes.io/ ● Apache Mesos https://mesos.apache.org/ ● Hashicorp Nomad https://www.nomadproject.io/
  20. 20. Our data is safe If we need to give our state to our container applications. We have options depending on our design choices ● Kubernetes http://kubernetes.io/docs/user-guide/volumes/ ● Flocker https://clusterhq.com/flocker/introduction/
  21. 21. This is how we protect ourselves from failure Service discovery is the backbone to our container schedulers. Service discovery dynamically updates the locations of our containers as they move between compute nodes. ● Consul https://www.consul.io/ ● Etcd https://coreos.com/etcd/
  22. 22. How is my data structured Dockerfile ● Base configurations for the container ● Arguments for runtime ● Live in it’s own git repo Run time ● Volume, CPU, Mem constraints ● Runtime args ● Name of container
  23. 23. How is my data structured CD/CI ● Unit test should live with the Dockerfile Unit test can be written in various languages. ● Golang ● Ruby ● Python
  24. 24. Is this production ready
  25. 25. Let’s tie it all together Kubernetes
  26. 26. Let’s tie it all together Docker Swarm with Flocker
  27. 27. Let’s tie it all together Mesos
  28. 28. Questions
  29. 29. About me https://forge.puppet.com/scottyc https://github.com/scotty-c https://hub.docker.com/u/scottyc/ @scottcoulton scottyc

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