Elastic Load Balance (ELB)
After ELB is configured, AS automatically binds instances to the load balancer when adding instances, and unbinds instances from the load balancer when removing instances.
Elastic Cloud Server (ECS)
The instances added in a scaling action can be managed and maintained on the ECS console.
Cloud Eye
If an alarm-triggered policy is configured, AS triggers scaling actions when an alarm triggering condition specified in Cloud Eye is met. Table 1 lists the AS metrics supported by Cloud Eye.
Metric |
Description |
Formula |
Description |
---|---|---|---|
CPU Usage |
CPU usage (%) of an AS group |
CPU usage of all instances in an AS group/Number of vCPUs of all instances in the AS group |
N/A |
Memory Usage |
Memory usage (%) of an AS group |
Used memory of all instances in an AS group/Total memory of all instances in the AS group |
This metric is unavailable if the image has no VM tools installed. |
Number of Instances |
Number of available instances in an AS group |
Total number of functional instances in an AS group |
N/A |
Inband Incoming Rate |
Number of incoming bytes summarized over the instances in an AS group per second |
(Total number of inband incoming bytes summarized over all instances in an AS group/Total number of instances in the AS group)/Monitoring period |
N/A |
Inband Outgoing Rate |
Number of outgoing bytes summarized over the instances in an AS group per second |
(Total number of inband outgoing bytes summarized over all instances in an AS group/Total number of instances in the AS group)/Monitoring period |
N/A |
Disks Read Rate |
Number of bytes read from all instances in an AS group per second |
(Total number of bytes read from all instances in an AS group/Total number of instances in the AS group)/Monitoring period |
N/A |
Disks Write Rate |
Number of bytes written to all instances in an AS group per second |
(Total number of bytes written to all instances in an AS group/Total number of instances in the AS group)/Monitoring period |
N/A |
Disks Read Requests |
Number of read requests sent to all instances in an AS group per second |
(Total number of read requests sent to all instances in an AS group/Total number of instances in the AS group)/Monitoring period |
N/A |
Disks Write Requests |
Number of write requests sent to all instances in an AS group per second |
(Total number of write requests sent to all instances in an AS group/Total number of instances in the AS group)/Monitoring period |
N/A |
OSs determine whether the Memory Usage, Inband Outgoing Rate, and Inband Incoming Rate metrics are supported. For details, see Elastic Cloud Server User Guide.