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resource_aws_autoscaling_group.go
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resource_aws_autoscaling_group.go
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package aws
import (
"fmt"
"log"
"strings"
"time"
"github.com/hashicorp/terraform/helper/resource"
"github.com/hashicorp/terraform/helper/schema"
"github.com/awslabs/aws-sdk-go/aws"
"github.com/awslabs/aws-sdk-go/service/autoscaling"
)
func resourceAwsAutoscalingGroup() *schema.Resource {
return &schema.Resource{
Create: resourceAwsAutoscalingGroupCreate,
Read: resourceAwsAutoscalingGroupRead,
Update: resourceAwsAutoscalingGroupUpdate,
Delete: resourceAwsAutoscalingGroupDelete,
Schema: map[string]*schema.Schema{
"name": &schema.Schema{
Type: schema.TypeString,
Required: true,
ForceNew: true,
},
"launch_configuration": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
"desired_capacity": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Computed: true,
},
"min_size": &schema.Schema{
Type: schema.TypeInt,
Required: true,
},
"max_size": &schema.Schema{
Type: schema.TypeInt,
Required: true,
},
"default_cooldown": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Computed: true,
ForceNew: true,
},
"force_delete": &schema.Schema{
Type: schema.TypeBool,
Optional: true,
Computed: true,
ForceNew: true,
},
"health_check_grace_period": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Computed: true,
},
"health_check_type": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Computed: true,
ForceNew: true,
},
"availability_zones": &schema.Schema{
Type: schema.TypeSet,
Required: true,
ForceNew: true,
Elem: &schema.Schema{Type: schema.TypeString},
Set: schema.HashString,
},
"load_balancers": &schema.Schema{
Type: schema.TypeSet,
Optional: true,
ForceNew: true,
Elem: &schema.Schema{Type: schema.TypeString},
Set: schema.HashString,
},
"vpc_zone_identifier": &schema.Schema{
Type: schema.TypeSet,
Optional: true,
Computed: true,
ForceNew: true,
Elem: &schema.Schema{Type: schema.TypeString},
Set: schema.HashString,
},
"termination_policies": &schema.Schema{
Type: schema.TypeSet,
Optional: true,
Computed: true,
ForceNew: true,
Elem: &schema.Schema{Type: schema.TypeString},
Set: schema.HashString,
},
"tag": autoscalingTagsSchema(),
},
}
}
func resourceAwsAutoscalingGroupCreate(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).autoscalingconn
var autoScalingGroupOpts autoscaling.CreateAutoScalingGroupInput
autoScalingGroupOpts.AutoScalingGroupName = aws.String(d.Get("name").(string))
autoScalingGroupOpts.LaunchConfigurationName = aws.String(d.Get("launch_configuration").(string))
autoScalingGroupOpts.MinSize = aws.Long(int64(d.Get("min_size").(int)))
autoScalingGroupOpts.MaxSize = aws.Long(int64(d.Get("max_size").(int)))
autoScalingGroupOpts.AvailabilityZones = expandStringList(
d.Get("availability_zones").(*schema.Set).List())
if v, ok := d.GetOk("tag"); ok {
autoScalingGroupOpts.Tags = autoscalingTagsFromMap(
setToMapByKey(v.(*schema.Set), "key"), d.Get("name").(string))
}
if v, ok := d.GetOk("default_cooldown"); ok {
autoScalingGroupOpts.DefaultCooldown = aws.Long(int64(v.(int)))
}
if v, ok := d.GetOk("health_check_type"); ok && v.(string) != "" {
autoScalingGroupOpts.HealthCheckType = aws.String(v.(string))
}
if v, ok := d.GetOk("desired_capacity"); ok {
autoScalingGroupOpts.DesiredCapacity = aws.Long(int64(v.(int)))
}
if v, ok := d.GetOk("health_check_grace_period"); ok {
autoScalingGroupOpts.HealthCheckGracePeriod = aws.Long(int64(v.(int)))
}
if v, ok := d.GetOk("load_balancers"); ok && v.(*schema.Set).Len() > 0 {
autoScalingGroupOpts.LoadBalancerNames = expandStringList(
v.(*schema.Set).List())
}
if v, ok := d.GetOk("vpc_zone_identifier"); ok && v.(*schema.Set).Len() > 0 {
exp := expandStringList(v.(*schema.Set).List())
strs := make([]string, len(exp))
for _, s := range exp {
strs = append(strs, *s)
}
autoScalingGroupOpts.VPCZoneIdentifier = aws.String(strings.Join(strs, ","))
}
if v, ok := d.GetOk("termination_policies"); ok && v.(*schema.Set).Len() > 0 {
autoScalingGroupOpts.TerminationPolicies = expandStringList(
v.(*schema.Set).List())
}
log.Printf("[DEBUG] AutoScaling Group create configuration: %#v", autoScalingGroupOpts)
_, err := conn.CreateAutoScalingGroup(&autoScalingGroupOpts)
if err != nil {
return fmt.Errorf("Error creating Autoscaling Group: %s", err)
}
d.SetId(d.Get("name").(string))
log.Printf("[INFO] AutoScaling Group ID: %s", d.Id())
if err := waitForASGCapacity(d, meta); err != nil {
return err
}
return resourceAwsAutoscalingGroupRead(d, meta)
}
func resourceAwsAutoscalingGroupRead(d *schema.ResourceData, meta interface{}) error {
g, err := getAwsAutoscalingGroup(d, meta)
if err != nil {
return err
}
if g == nil {
return nil
}
d.Set("availability_zones", g.AvailabilityZones)
d.Set("default_cooldown", g.DefaultCooldown)
d.Set("desired_capacity", g.DesiredCapacity)
d.Set("health_check_grace_period", g.HealthCheckGracePeriod)
d.Set("health_check_type", g.HealthCheckType)
d.Set("launch_configuration", g.LaunchConfigurationName)
d.Set("load_balancers", g.LoadBalancerNames)
d.Set("min_size", g.MinSize)
d.Set("max_size", g.MaxSize)
d.Set("name", g.AutoScalingGroupName)
d.Set("tag", g.Tags)
d.Set("vpc_zone_identifier", strings.Split(*g.VPCZoneIdentifier, ","))
d.Set("termination_policies", g.TerminationPolicies)
return nil
}
func resourceAwsAutoscalingGroupUpdate(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).autoscalingconn
opts := autoscaling.UpdateAutoScalingGroupInput{
AutoScalingGroupName: aws.String(d.Id()),
}
if d.HasChange("desired_capacity") {
opts.DesiredCapacity = aws.Long(int64(d.Get("desired_capacity").(int)))
}
if d.HasChange("launch_configuration") {
opts.LaunchConfigurationName = aws.String(d.Get("launch_configuration").(string))
}
if d.HasChange("min_size") {
opts.MinSize = aws.Long(int64(d.Get("min_size").(int)))
}
if d.HasChange("max_size") {
opts.MaxSize = aws.Long(int64(d.Get("max_size").(int)))
}
if d.HasChange("health_check_grace_period") {
opts.HealthCheckGracePeriod = aws.Long(int64(d.Get("health_check_grace_period").(int)))
}
if err := setAutoscalingTags(conn, d); err != nil {
return err
} else {
d.SetPartial("tag")
}
log.Printf("[DEBUG] AutoScaling Group update configuration: %#v", opts)
_, err := conn.UpdateAutoScalingGroup(&opts)
if err != nil {
d.Partial(true)
return fmt.Errorf("Error updating Autoscaling group: %s", err)
}
return resourceAwsAutoscalingGroupRead(d, meta)
}
func resourceAwsAutoscalingGroupDelete(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).autoscalingconn
// Read the autoscaling group first. If it doesn't exist, we're done.
// We need the group in order to check if there are instances attached.
// If so, we need to remove those first.
g, err := getAwsAutoscalingGroup(d, meta)
if err != nil {
return err
}
if g == nil {
return nil
}
if len(g.Instances) > 0 || *g.DesiredCapacity > 0 {
if err := resourceAwsAutoscalingGroupDrain(d, meta); err != nil {
return err
}
}
log.Printf("[DEBUG] AutoScaling Group destroy: %v", d.Id())
deleteopts := autoscaling.DeleteAutoScalingGroupInput{AutoScalingGroupName: aws.String(d.Id())}
// You can force an autoscaling group to delete
// even if it's in the process of scaling a resource.
// Normally, you would set the min-size and max-size to 0,0
// and then delete the group. This bypasses that and leaves
// resources potentially dangling.
if d.Get("force_delete").(bool) {
deleteopts.ForceDelete = aws.Boolean(true)
}
// We retry the delete operation to handle InUse/InProgress errors coming
// from scaling operations. We should be able to sneak in a delete in between
// scaling operations within 5m.
err = resource.Retry(5*time.Minute, func() error {
if _, err := conn.DeleteAutoScalingGroup(&deleteopts); err != nil {
if awserr, ok := err.(aws.APIError); ok {
switch awserr.Code {
case "InvalidGroup.NotFound":
// Already gone? Sure!
return nil
case "ResourceInUse", "ScalingActivityInProgress":
// These are retryable
return awserr
}
}
// Didn't recognize the error, so shouldn't retry.
return resource.RetryError{Err: err}
}
// Successful delete
return nil
})
if err != nil {
return err
}
return resource.Retry(5*time.Minute, func() error {
if g, _ = getAwsAutoscalingGroup(d, meta); g != nil {
return fmt.Errorf("Auto Scaling Group still exists")
}
return nil
})
}
func getAwsAutoscalingGroup(
d *schema.ResourceData,
meta interface{}) (*autoscaling.AutoScalingGroup, error) {
conn := meta.(*AWSClient).autoscalingconn
describeOpts := autoscaling.DescribeAutoScalingGroupsInput{
AutoScalingGroupNames: []*string{aws.String(d.Id())},
}
log.Printf("[DEBUG] AutoScaling Group describe configuration: %#v", describeOpts)
describeGroups, err := conn.DescribeAutoScalingGroups(&describeOpts)
if err != nil {
autoscalingerr, ok := err.(aws.APIError)
if ok && autoscalingerr.Code == "InvalidGroup.NotFound" {
d.SetId("")
return nil, nil
}
return nil, fmt.Errorf("Error retrieving AutoScaling groups: %s", err)
}
// Search for the autoscaling group
for idx, asc := range describeGroups.AutoScalingGroups {
if *asc.AutoScalingGroupName == d.Id() {
return describeGroups.AutoScalingGroups[idx], nil
}
}
// ASG not found
d.SetId("")
return nil, nil
}
func resourceAwsAutoscalingGroupDrain(d *schema.ResourceData, meta interface{}) error {
conn := meta.(*AWSClient).autoscalingconn
// First, set the capacity to zero so the group will drain
log.Printf("[DEBUG] Reducing autoscaling group capacity to zero")
opts := autoscaling.UpdateAutoScalingGroupInput{
AutoScalingGroupName: aws.String(d.Id()),
DesiredCapacity: aws.Long(0),
MinSize: aws.Long(0),
MaxSize: aws.Long(0),
}
if _, err := conn.UpdateAutoScalingGroup(&opts); err != nil {
return fmt.Errorf("Error setting capacity to zero to drain: %s", err)
}
// Next, wait for the autoscale group to drain
log.Printf("[DEBUG] Waiting for group to have zero instances")
return resource.Retry(10*time.Minute, func() error {
g, err := getAwsAutoscalingGroup(d, meta)
if err != nil {
return resource.RetryError{Err: err}
}
if g == nil {
return nil
}
if len(g.Instances) == 0 {
return nil
}
return fmt.Errorf("group still has %d instances", len(g.Instances))
})
}
var waitForASGCapacityTimeout = 10 * time.Minute
// Waits for a minimum number of healthy instances to show up as healthy in the
// ASG before continuing. Waits up to `waitForASGCapacityTimeout` for
// "desired_capacity", or "min_size" if desired capacity is not specified.
func waitForASGCapacity(d *schema.ResourceData, meta interface{}) error {
waitFor := d.Get("min_size").(int)
if v := d.Get("desired_capacity").(int); v > 0 {
waitFor = v
}
log.Printf("[DEBUG] Waiting for group to have %d healthy instances", waitFor)
return resource.Retry(waitForASGCapacityTimeout, func() error {
g, err := getAwsAutoscalingGroup(d, meta)
if err != nil {
return resource.RetryError{Err: err}
}
if g == nil {
return nil
}
healthy := 0
for _, i := range g.Instances {
if i.HealthStatus == nil {
continue
}
if strings.EqualFold(*i.HealthStatus, "Healthy") {
healthy++
}
}
log.Printf(
"[DEBUG] %q has %d/%d healthy instances", d.Id(), healthy, waitFor)
if healthy >= waitFor {
return nil
}
return fmt.Errorf("Waiting for healthy instances: %d/%d", healthy, waitFor)
})
}