InstanceTemplate should be usable in all selected zones.

[ValentinBouin]

Hello, 
I have a managed instance group, and when i want add more than 3 nodes, i have this error : 

 gcloud compute instance-groups managed resize mig_name --size=4 --region=europe-west1
ERROR: (gcloud.compute.instance-groups.managed.resize) Could not fetch resource:
- Invalid value for field 'size': '4'. InstanceTemplate should be usable in all selected zones.

In my instance template, i tried to remove : 
 - statefull disk
 - change machine type
 - change distribution_policy_target_shape (ANY, BALANCED , same result)
 - add all my zones in distribution_policy_zones
 - change regional or zonal instance template
 - activate instance redistribution 

Thanks 

[DamianS]

Hello @ValentinBouin  ,Welcome on Google Cloud Community.

Are you able to provide your Template config ? It might be possible that due to lack of support for either Network / HW or Disk config in one of your zone, you are getting such error. 
You can use the gcloud compute machine-types list --zone ZONE command to see available machine types in each zone

--
cheers,
DamianS
LinkedIn medium.com Cloudskillsboost

[ValentinBouin · Accepted solution]

Hello, thank you for your answer. Finally I found, I used google console and gcloud cli, but the message was not complete. With terraform : 
│ Reason: invalid, Message: Invalid value for field 'size': '4'. The instance template cannot be used to create more than one instance per zone in the instance group. This is because the instance template has attached a disk definition with a custom disk name and only one disk with a specific name can exist in a zone. To create more than one instance, set the name of the disk to instance name or Autogenerated


So, i remove the name of my statefull disk, and now all it's good ! 
Thanks