I am using Kubernetes deployment. I wish to start the pods one by one. Not all at once. Is there any way. I do not want to use statefulSet.
kind: Deployment
metadata:
name: my-deployment
labels:
app: my-app
spec:
replicas: 3
selector:
matchLabels:
app: my-app
template:
metadata:
labels:
app: my-app
spec:
containers:
- name: my-app
image: my-container-image
ports:
- name: https
containerPort: 8443
volumeMounts:
- mountPath: /tmp
name: app-vol
restartPolicy: Always
imagePullSecrets:
- name: regcred
volumes:
- name: app-vol
persistentVolumeClaim:
claimName: app-volI wish to start the pods one by one. Not all at once. Is there any way. I do not want to use statefulSet.
Unfortunately you are trying to accomplish something with Deployment that is achievable with Statefulset. Is it possible to achieve the desired effect with deployment? A similar one can be obtained, but it will require creating a custom script and it will be a non-standard solution.
However, this will not be a recommended solution. Statefulset works well for feed control during starts, and you shouldn't use anything else here.
To sum up: you should change the assumptions a bit and accept the statefulset, thanks to which you will achieve the result you want, or you should not control the order in which the pods are run.
As rohatgisanat mentioned in the comment:
Deployments do not guarantee ordered starts. StatefulSets are the way to achieve what you require.