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docs: Mixed spot + on-demand instance documentation (#967)

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* Add example for lauch config with mixed lifecycles

* Set what on-demand instance is

* Tweak wording

Co-authored-by: Thomas O'Neill <toneill@new-innov.com>
Co-authored-by: Daniel Piddock <daniel.piddock@teamcmp.com>
This commit is contained in:
Thomas O'Neill
2020-08-14 09:58:34 -04:00
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parent 1c81227044
commit c508d12b69
1 changed files with 24 additions and 0 deletions
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docs/spot-instances.md
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@@ -83,6 +83,30 @@ Launch Template support is a recent addition to both AWS and this module. It mig
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```
## Using Launch Templates With Both Spot and On Demand
Example launch template to launch 2 on demand instances of type m5.large, and have the ability to scale up using spot instances and on demand instances. The `node.kubernetes.io/lifecycle` node label will be set to the value queried from the EC2 meta-data service: either "on-demand" or "spot".
`on_demand_percentage_above_base_capacity` is set to 25 so 1 in 4 new nodes, when auto-scaling, will be on-demand instances. If not set, all new nodes will be spot instances. The on-demand instances will be the primary instance type (first in the array if they are not weighted).
```hcl
worker_groups_launch_template = [{
name = "mixed-demand-spot"
override_instance_types = ["m5.large", "m5a.large", "m4.large"]
root_encrypted = true
root_volume_size = 50
asg_min_size = 2
asg_desired_capacity = 2
on_demand_base_capacity = 3
on_demand_percentage_above_base_capacity = 25
asg_max_size = 20
spot_instance_pools = 3
kubelet_extra_args = "--node-labels=node.kubernetes.io/lifecycle=`curl -s http://169.254.169.254/latest/meta-data/instance-life-cycle`"
}]
```
## Important Notes
An issue with the cluster-autoscaler: https://github.com/kubernetes/autoscaler/issues/1133