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[GCE] Support Managed Instance Groups #842



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@supertom supertom commented Jul 20, 2016

[GCE] Support for Managed Instance Groups


This PR aims to add support for Managed Instance Groups (MIGs) on GCE. Basic support for AutoScalers has also been added.

The following methods have been added (with supporting classes).

  • gce.ex_get_instancetemplate(template)
  • gce.ex_list_instancetemplates()
  • gce.ex_get_instancegroupmanager(name, zone)
  • gce.ex_list_instancegroupmanagers()
  • gce.ex_create_instancegroupmanager(name, zone, template, size)
  • gce.ex_destroy_instancegroupmanager(instance_group)
  • gce.ex_instancegroupmanager_resize(instance_group, num_instances)
  • gce.ex_instancegroupmanager_recreate_instances(instance_group, list_of_instances)
  • gce.ex_instancegroupmanager_list_managed_instances(instance_group)
  • gce.ex_get_autoscaler(as_name, as_zone)
  • gce.ex_create_autoscaler(as_name, as_zone, my_instance_group, autoscaler_policy, description)
  • gce.ex_list_autoscalers(as_zone)

(Some) Tests and fixtures have also been added.

Useful Links

Example Usage

print gce.ex_list_autoscalers()
print gce.ex_list_instancetemplates()
print gce.ex_list_instancegroupmanagers()
print gce.ex_instancegroupmanagers_list_managed_instances()

# Create an Instance Group
ig_name = 'my-instance-group-foo7'
ig_zone = 'us-central1-c'
it_name = 'my-instance-template-1'

template = gce.ex_get_instancetemplate(it_name)
instance_group = gce.ex_create_instancegroupmanager(ig_name, ig_zone, template, 5, 'base-foo', "my description")
print instance_group

print gce.ex_instancegroupmanager_resize(instance_group, 4)
print gce.ex_instancegroupmanager_recreate_instances(instance_group)

# add autoscaling to the instance group
autoscaler_policy = {
  "maxNumReplicas": 7,
  "minNumReplicas": 4,
  "coolDownPeriodSec": 35,
  "cpuUtilization": {"utilizationTarget": .66}

new_as = gce.ex_create_autoscaler(
  as_name, as_zone, my_instance_group, autoscaler_policy,
  description='My desc for this autoscaler')
print new_as
print gce.ex_list_autoscalers(as_zone)

# Update AutoScaler
updated_as = gce.ex_get_autoscaler(as_name, as_zone)
updated_as.policy['coolDownPeriodSec'] = 71
updated_as.policy['cpuUtilization']['utilizationTarget'] = .14
print gce.ex_update_autoscaler(updated_as)

# Delete the Instance Group.  VMs are also deleted.
deleted = gce.ex_destroy_instancegroupmanager(instance_group)
print deleted # returns True


  • ready_for_review

Checklist (tick everything that applies)

  • Code linting (required, can be done after the PR checks)
  • Documentation
  • Tests
  • ICLA (required for bigger changes)
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@tonybaloney tonybaloney commented Jul 20, 2016

Good work Tom. Do you have an ICLA signed btw?

:type size: ``str``
:param zone: Zone to wich the Instance Group belongs
:type zone: ``str``

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erjohnso Jul 28, 2016

Consider also allowing GCEZone. Same with other methods.

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@erjohnso erjohnso commented Jul 28, 2016

Small nit about allowing other param types, but otherwise LGTM!

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Contributor Author

@supertom supertom commented Aug 12, 2016

@tonybaloney I thought I did have an ICLA on file, but I didn't, so thanks for asking. It's now on file with Apache.

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@tonybaloney tonybaloney commented Aug 12, 2016

That's cool @supertom, I don't have access to check them. I won't ask again!

… Groups in libcloud.

The following methods have been added (with supporting classes).

* gce.ex_get_instancetemplate(template)
* gce.ex_list_instancetemplates()
* gce.ex_get_instancegroupmgr(name, zone)
* gce.ex_list_instancegroupmgrs()
* gce.ex_create_instancegroupmgr(name, zone, template, size)
* gce.ex_destroy_instancegroupmgr(instance_group)

Basic AutoScaler support has also been added.

Tests and fixtures have also been added.  Some documentation, unrelated to this feature, has also been fixed.
@supertom supertom force-pushed the supertom:libcloud_gce-group-instance-support branch from cd7d591 to 6df8fe6 Aug 15, 2016
@asfgit asfgit closed this in 214677f Aug 17, 2016
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3 participants