I am trying to autoscale my StatefulSet on Kubernetes. In order to do so, I need to get the current number of pods.
When dealing with deployments:
kubectl describe deployments [deployment-name] | grep desired | awk '{print $2}' | head -n1
This outputs a number, which is the amount of current deployments.
However, when you run
kubectl describe statefulsets
We don't get back as much information. Any idea how I can get the current number of replicas of a stateful set?
kubectl get sts web -n default -o=jsonpath='{.status.replicas}'
This also works with .status.readyReplicas and .status.currentReplicas
From github.com/kubernetes:
// replicas is the number of Pods created by the StatefulSet controller.
Replicas int32// readyReplicas is the number of Pods created by the StatefulSet controller that have a Ready Condition.
ReadyReplicas int32// currentReplicas is the number of Pods created by the StatefulSet controller from the StatefulSet version
// indicated by currentRevision.
CurrentReplicas int32
you should be running one of the below command
master $ kubectl get statefulsets
NAME DESIRED CURRENT AGE
web 4 4 2m
master $
master $ kubectl get sts
NAME DESIRED CURRENT AGE
web 4 4 2m
number of running pods
---------------------
master $ kubectl describe sts web|grep Status
Pods Status: 4 Running / 0 Waiting / 0 Succeeded / 0 Failed
another way
------------
master $ kubectl get sts --show-labels
NAME DESIRED CURRENT AGE LABELS
web 4 4 33s app=nginx
master $ kubectl get po -l app=nginx
NAME READY STATUS RESTARTS AGE
web-0 1/1 Running 0 56s
web-1 1/1 Running 0 55s
web-2 1/1 Running 0 30s
web-3 1/1 Running 0 29s
master $ kubectl get po -l app=nginx --no-headers
web-0 1/1 Running 0 2m
web-1 1/1 Running 0 2m
web-2 1/1 Running 0 1m
web-3 1/1 Running 0 1m
master $
master $
master $ kubectl get po -l app=nginx --no-headers | wc -l
4
