apiVersion: serving.knative.dev/v1
kind: Service
metadata:
name: showcase
namespace: default
spec:
template:
metadata:
annotations:
autoscaling.knative.dev/min-scale: "0"
...
Scale bounds determine the minimum and maximum numbers of replicas that can serve an application at any given time. You can set scale bounds for an application to help prevent cold starts or control computing costs.
The minimum number of replicas that can serve an application is determined by the min-scale
annotation. If scale to zero is not enabled, the min-scale
value defaults to 1
.
The min-scale
value defaults to 0
replicas if the following conditions are met:
The min-scale
annotation is not set
Scaling to zero is enabled
The class KPA
is used
min-scale
annotationapiVersion: serving.knative.dev/v1
kind: Service
metadata:
name: showcase
namespace: default
spec:
template:
metadata:
annotations:
autoscaling.knative.dev/min-scale: "0"
...
Using the Knative (kn
) CLI to set the min-scale
annotation provides a more streamlined and intuitive user interface over modifying YAML files directly. You can use the kn service
command with the --scale-min
flag to create or modify the min-scale
value for a service.
Knative Serving is installed on the cluster.
You have installed the Knative (kn
) CLI.
Set the minimum number of replicas for the service by using the --scale-min
flag:
$ kn service create <service_name> --image <image_uri> --scale-min <integer>
$ kn service create showcase --image quay.io/openshift-knative/showcase --scale-min 2
The maximum number of replicas that can serve an application is determined by the max-scale
annotation. If the max-scale
annotation is not set, there is no upper limit for the number of replicas created.
max-scale
annotationapiVersion: serving.knative.dev/v1
kind: Service
metadata:
name: showcase
namespace: default
spec:
template:
metadata:
annotations:
autoscaling.knative.dev/max-scale: "10"
...
Using the Knative (kn
) CLI to set the max-scale
annotation provides a more streamlined and intuitive user interface over modifying YAML files directly. You can use the kn service
command with the --scale-max
flag to create or modify the max-scale
value for a service.
Knative Serving is installed on the cluster.
You have installed the Knative (kn
) CLI.
Set the maximum number of replicas for the service by using the --scale-max
flag:
$ kn service create <service_name> --image <image_uri> --scale-max <integer>
$ kn service create showcase --image quay.io/openshift-knative/showcase --scale-max 10