Instance Groups

Question 1

Instance Group

Answer 1

Ans. Group of VM instances managed as a single entity
–> Manage group of similar VMs having similar lifecycles as ONE UNIT

Question 2

Two Types of Instance Groups

Answer 2

1. Managed : Identical VMs created using a template. Features: Auto scaling, auto healing and managed releases
2. Unmanaged : Different configuration for VMs in same group. Does NOT offer auto scaling, auto healing & other services. NOT Recommended unless you need different kinds of VMs

Question 3

Cool-down period :

Answer 3

How long to wait before looking at auto scaling metrics again?

Question 4

Scale In Controls :

Answer 4

Prevent a sudden drop in no of VM instances

Question 5

Autohealing :

Answer 5

Configure a Health check with Initial delay (How long should you wait for your app to initialize before running a health check?)

Question 6

Rolling updates :

Answer 6

Release new version step by step (gradually). Update a percentage of instances to the new version at a time.

Question 7

Canary Deployment :

Answer 7

Test new version with a group of instances before releasing it across all instances.