[aws-ec2] Instance creation and PlacementGroup options

[nbenaglia]

When creating an EC2 instance (new ec2.Instance), it should be possible to specify a placement group where instance belongs.

[rix0rrr]

Placement groups are a Launch Template feature, are they not?

[nbenaglia]

In AWS::EC2::Instance there's a PlacementGroup property:

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-instance.html#cfn-ec2-instance-placementgroupname

And from AWS Console you can launch an EC2, specify the placementGroup without passing through a launchTemplate.

[AGSaidi]

You can do this like the following, but it would be nice to be able to specify it in the constructor.

pg = CfnPlacementGroup(self, 'my-placement-group', strategy='cluster')
i = ec2.Instance(self, 'instance-of-mine',
            instance_type=...
i.instance.add_property_override('PlacementGroupName', pg.ref)

[github-actions]

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[comcalvi]

fixed by #24775

[rogerkenny]

I'm still not seeing a way to specify a placement group when launching an ec2 instance. Am I missing it?

[pahud]

@rogerkenny we'll add that support for ec2.Instance from here #30292

[smeikalr]

You can do this like the following, but it would be nice to be able to specify it in the constructor.

pg = CfnPlacementGroup(self, 'my-placement-group', strategy='cluster')
i = ec2.Instance(self, 'instance-of-mine',
            instance_type=...
i.instance.add_property_override('PlacementGroupName', pg.ref)

For Python and Launch Template:

launch_template = ec2.LaunchTemplate(...)
placement_group = ec2.CfnPlacementGroup(self, "my-placement-group", strategy="cluster")
launch_template.node.default_child.add_property_override("LaunchTemplateData.Placement.GroupName", placement_group.ref)