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Model block devices #12

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ianunruh opened this issue Nov 2, 2013 · 0 comments
Open

Model block devices #12

ianunruh opened this issue Nov 2, 2013 · 0 comments
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modeling

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@ianunruh
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ianunruh commented Nov 2, 2013

We should consider modeling block devices that can be attached to managed instances.

IMPORTANT: This will only work with an instance that is clustered (like a MySQL slave). Otherwise, there will be service downtime.

Instance replacement workflow w/ block devices

  1. Provision a new instance, bring instance to setup stage
  2. Inform dependent instances that the old instance is going away
  3. Bring old instance to undeploy stage
  4. Detach volume from old instance, wait until volume is detached
  5. Attach volume to new instance
  6. Bring new instance to the deploy stage
  7. Inform dependent instances that the new instance is ready
  8. Terminate old instance

Sequence diagram
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