Auto Scaling
EC2 VMs can be placed into Auto Scaling Groups which can be dynamically created and destroyed based on metrics such as CPU utilisation or load averages.
By default, EC2 auto-scaling operations are performed immediately, without warning and without awareness of the workload running on EC2 instances.
- Auto-scale terminates on scale-in.
- Infrastructure patching terminates and replaces
Instance lifecycle
stateDiagram-v2
direction TB
PendingLifecycleHooks: Lifecycle hooks
state PendingLifecycleHooks {
PendingWait: Pending\u003A Wait
PendingProceed: Pending\u003A Proceed
[*] --> PendingWait
PendingWait --> PendingProceed
PendingProceed --> [*]
}
[*] --> Pending
Pending --> PendingLifecycleHooks: Initial launch
PendingLifecycleHooks --> InService
Pending --> InService
InService --> EnteringStandby: User puts instance into standby
EnteringStandby --> Standby
Standby --> InService: User returns instance to service
TerminatingLifecycleHooks: Lifecycle hooks
state TerminatingLifecycleHooks {
TerminatingWait: Terminating\u003AWait
TerminatingProceed: Terminating\u003AProceed
[*] --> TerminatingWait
TerminatingWait --> TerminatingProceed
TerminatingProceed --> [*]
}
InService --> Terminating: Scale-in
InService --> Terminating: Failed health check
Terminating --> TerminatingLifecycleHooks
TerminatingLifecycleHooks --> Terminated
Terminating --> Terminated
Terminated --> [*]
InService --> Detaching: User detaches instance
Detaching --> Detached
Detached --> [*]
Events
References
Backlinks