Configure a Compute Engine MIG in Application Design Center

Preview

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A Compute Engine managed instance group (MIG) is a collection of VM instances that use load balancing and automated services, like autoscaling and autohealing. With a MIG, you can manage a group of VM instances as one entity.

For more information, see the following:

• Compute Engine overview
• Managed instance groups (MIGs)

Required configuration parameters

If your template includes a Compute Engine MIG component, you must configure the following parameters before you deploy.

Parameter name	Description and constraints	Background information
Project ID	The App Hub service project where you want to create the Compute Engine MIG.	Set up App Hub
Region	region	About Regional MIGs
Instance Template	instanceTemplate	About Instance Templates

Optional configuration parameters

The following parameters are optional. To display advanced parameters, in the Configuration area, select Show advanced fields.

Feature	Parameter name	Description and constraint information	Background information
	MIG name	name
	Hostname	Hostname prefix for instances
	Target Size	targetSize	Create a MIG with autoscaling enabled.
	Max Replicas	autoscalingPolicy.maxNumReplicas	Create a MIG with autoscaling enabled
	Min replicas	autoscalingPolicy.minNumReplicas	Create a MIG with autoscaling enabled
	Autoscaling Mode	autoscalingPolicy.mode	Autoscaling mode
	Target Pools	targetPools[]	Add a managed instance group to a target pool
	Distribution Policy Target Shape	distributionPolicy.targetShape	feedbackRegional MIG target distribution shape
	Distribution Policy Zones	distributionPolicy.zones[]	Set a target distribution shape for VMs in a regional MIG
Stateful Disks	Device Name	statefulPolicy.preservedState.disks[]	Configuring stateful persistent disks in MIGs
	Delete Rule	statefulPolicy.preservedState.disks[].autoDelete	Configuring stateful persistent disks in MIGs
Stateful IPs	Interface Name	statefulPolicy.preservedState.internalIPs[]	Configuring stateful IP addresses in MIGs
	Delete Rule	statefulPolicy.preservedState.internalIPs[].autoDelete	Configuring stateful IP addresses in MIGs
	Is External	statefulPolicy.preservedState.externalIPs[]	Configuring stateful IP addresses in MIGs
Update Policy	Max Surge Fixed	updatePolicy.maxSurge.fixed	Maximum surge
	Instance Redistribution Type	updatePolicy.instanceRedistributionType	Proactive instance redistribution
	Max Surge Percent	updatePolicy.maxSurge.percent	Maximum surge
	Max Unavailable Fixed	updatePolicy.maxUnavailable.fixed	Maximum unavailable
	Max Unavailable Percent	updatePolicy.maxUnavailable.percent	Maximum unavailable
	Min Ready Sec	updatePolicy.minReadySec	Minimum wait time
	Replacement Method	updatePolicy.replacementMethod	Replacement method
	Minimal Action	updatePolicy.minimalAction	Minimal action
	Type	updatePolicy.type	Update type
	Most Disruptive Allowed Action	updatePolicy.mostDisruptiveAllowedAction	Most disruptive allowed action
	Health Check Name	name	Health checks overview
Health Check	Type	type	Health check categories, protocols, and ports
	Initial Delay Seconds	autoHealingPolicies[].initialDelaySec	Configure an autohealing policy in a MIG
	Check Interval Sec	checkIntervalSec	Configure an autohealing policy in a MIG
	Healthy Threshold	healthyThreshold	Configure an autohealing policy in a MIG
	Timeout Sec	timeoutSec	What makes a good autohealing health check
	Unhealthy Threshold	unhealthyThreshold	Configure an autohealing policy in a MIG
	Response	httpsHealthCheck.response	Success criteria for HTTP, HTTPS, and HTTP/2
	Proxy Header	httpsHealthCheck.proxyHeader	Headers
	Port	httpsHealthCheck.port	Health check categories, protocols, and ports
	Request	tcpHealthCheck.request	Success criteria for HTTP, HTTPS, and HTTP/2
	Request Path	httpsHealthCheck.requestPath	Success criteria for HTTP, HTTPS, and HTTP/2
	Host	httpsHealthCheck.host	Headers
	Enable Logging	logConfig.enable	Health check logging information
	Autoscaler Name	name	If empty, the name is derived from hostname.
	Autoscaling Enabled	Create an autoscaler for the MIG	Autoscaling groups of instances
	Cooldown Period	autoscalingPolicy.coolDownPeriodSec	Initialization period
Autoscaling CPU	Target	autoscalingPolicy.cpuUtilization.utilizationTarget	Scaling based on CPU utilization
	Predictive Method	autoscalingPolicy.cpuUtilization.predictiveMethod	Predictive autoscaling
Autoscaling Metric	Name	name	Autoscale to maintain a metric at a target value
	Target	autoscalingPolicy.customMetricUtilizations[].utilizationTarget	Autoscale to maintain a metric at a target value
	Type	autoscalingPolicy.customMetricUtilizations[].utilizationTargetType	Autoscale to maintain a metric at a target value
Scaling Schedules	Disabled	autoscalingPolicy.scalingSchedules[].disabled	Scaling based on schedules
	Duration Sec	autoscalingPolicy.scalingSchedules[].durationSec	Scaling schedule settings
	Min Required Replicas	autoscalingPolicy.scalingSchedules[].minRequiredReplicas	Scaling schedule settings
	Name		Creating a schaling schedule
	Schedule	autoscalingPolicy.scalingSchedules[].schedule	Scaling schedule settings
	Time Zone	autoscalingPolicy.scalingSchedules[].timeZone	Scaling schedule settings
Autoscaling Scale in Control	Fixed Replicas	autoscalingPolicy.scaleInControl.maxScaledInReplicas.fixed	Configure scale-in controls
	Percent Replicas	autoscalingPolicy.scaleInControl.maxScaledInReplicas.percent	Configure scale-in controls
	Time Window Sec	autoscalingPolicy.scaleInControl.timeWindowSec	Configure scale-in controls
Named Ports	Name	namedPorts[].name	Named ports
	Port	namedPorts[].port	Named ports
	Wait for Instances	Whether to wait for all instances to be created/updated before returning. If set to true, when the operation fails, Terraform continues trying until the timeout is reached.
MIG Timeouts	Create	Timeout for Terraform instance creation.
	Update	Timeout for Terraform instance update.
	Delete	Timeout for Terraform instance deletion.
Labels	Key	allInstancesConfig.properties.labels	Organize resources using labels
	Value	allInstancesConfig.properties.labels	Organize resources using labels