Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Automating AWS

Automating AWS

Using Octopus, Cloud Formation and Powershell DSC to build immutable phoenix environments in AWS

Andrew Best

July 19, 2016
Tweet

More Decks by Andrew Best

Other Decks in Programming

Transcript

  1. Page Birds-eye view / Copyright ©2014 by Readify Pty Ltd

    3 Step 1: Deploy infrastructure Step 2: Bootstrap instances Step 3: Deploy software
  2. Page / Copyright ©2014 by Readify Pty Ltd 5 Deploy

    Infrastructure Bootstrap Instances Register Tentacle Deploy Software Fire Project Trigger Nothing up my sleeve…
  3. Page / Copyright ©2014 by Readify Pty Ltd 6 Deploy

    Infrastructure Bootstrap Instances Register Tentacle Deploy Software Fire Project Trigger Nothing up my sleeve…
  4. Page Step 1: Deploy infrastructure › Deploy.ps1 › Package and

    upload bootstrapping resources to S3 › Package and upload configuration variables to S3 › Do we need to deploy a new stack? › Yes - New-CFNStack › No - New-CFNChangeSet › CloudFormation resource creation based on template / Copyright ©2014 by Readify Pty Ltd 7
  5. Page / Copyright ©2014 by Readify Pty Ltd 8 Deploy

    Infrastructure Bootstrap Instances Register Tentacle Deploy Software Fire Project Trigger Nothing up my sleeve…
  6. Page Step 2: Bootstrap instances › EC2 userdata › cfn-init.exe

    › AWS::CloudFormation::Init › Powershell DSC › Octopus tentacle › tentacle.exe --register-with / Copyright ©2014 by Readify Pty Ltd 9
  7. Page / Copyright ©2014 by Readify Pty Ltd 10 Deploy

    Infrastructure Bootstrap Instances Register Tentacle Deploy Software Fire Project Trigger Nothing up my sleeve…
  8. Page Step 3: Deploy software › Prior to Octopus 3.4

    => DSC › Octopus 3.4 => Project Triggers › Software is deployed by Octopus via the Project Trigger › DSC polls a local health check endpoint › ASG waits to be signalled before completion › DSC => cfn-signal.exe › fin / Copyright ©2014 by Readify Pty Ltd 11
  9. Page / Copyright ©2014 by Readify Pty Ltd 12 Deploy

    Infrastructure Bootstrap Instances Register Tentacle Deploy Software Fire Project Trigger Nothing up my sleeve…
  10. Page Updating CF stacks What updating stacks used to be

    like / Copyright ©2014 by Readify Pty Ltd 14 Are you feeling lucky?
  11. Page CloudFormation Change Sets › Supply your updated template to

    a Change Set via New-CFNChangeSet › AWS diffs the updated template against the current stack › A detailed list of what changes and what doesn’t is provided › Details the dependency chain and how it is effected / Copyright ©2014 by Readify Pty Ltd 16
  12. Page Immutability › Rev infrastructure package => refresh instances ›

    CI + CloudFormation can do this for us › Inject version into Launch configuration userdata › Triggers a replacement of the launch configuration › How do we stay HA while our infrastructure refreshes? / Copyright ©2014 by Readify Pty Ltd 17
  13. Page AutoScaleGroup Update Policies › Allows an ASG to stay

    HA while undergoing a refresh › Keeps a number of instances in service while terminating stale and creating fresh instances › Works with cfn-signal.exe to ensure updates are successful › Rolls back on failure / Copyright ©2014 by Readify Pty Ltd 18
  14. Page Deploying feature branches › The Dream: › Developer checks

    in code on a feature branch › The feature branch is built by our CI service of choice › Once complete, our CI service then invokes Octopus and triggers an isolated stack of hardware to be deployed for it › Once the hardware is ready, the feature branch’s payload is automatically deployed to it by Octopus › From check-in to our feature running on new, isolated compute. Ready to test and destroy when we are done / Copyright ©2014 by Readify Pty Ltd 20
  15. Page Octopus 3.4 › Introduces new features that allow us

    to work with a tonne more flexibility in elastic environments › Multi-tenancy › Project Triggers / Auto Deploy Overrides › Machine Policies / Copyright ©2014 by Readify Pty Ltd 21
  16. Page Setup › We have built a new feature ryan

    on an isolated feature branch! We push the code up to our repository › Our CI service notices this and creates a release for our feature branch package, with a semver version number 1.0.0-ryan0001 / Copyright ©2014 by Readify Pty Ltd 22
  17. Page Octo 3.4 – Multi-tenancy › We created a tenant

    ryan0001for our feature branch –we are using the semver from the built package as a naming convention › Allows us to isolate and group sets of machines within an environment › Allows us to configure projects with tenant-specific variables › Allows us to control what software gets deployed to what sets of machines via triggers within an environment / Copyright ©2014 by Readify Pty Ltd 23
  18. Page Octo 3.4 – Auto Deploy Overrides › We created

    an auto deploy override for our feature branch tenant ryan0001 for the feature branch package version 1.0.0-ryan0001 › Part of Project Triggers › Auto Deploy Overrides allow us to say ‘when a project trigger fires, and the machine that triggered it is for a given tenant, deploy an explicit version of the project to the machine, not the default’ / Copyright ©2014 by Readify Pty Ltd 24
  19. Page Octo 3.4 – Machine Policies › When our instances

    register with Octopus via tentacle.exe, they indicate a machine policy › When we clean up our CloudFormation, how do we ensure Octopus is cleaned up as well? › Old way: AWS Lambda › New way: Octopus Machine Policies › Healthchecks and unavailable machines › Cleanup unavailable machines / Copyright ©2014 by Readify Pty Ltd 25