I would like to benchmark my system by creating many pods running the same container. I'm using the following example:

apiVersion: v1
kind: Pod
metadata:
  name: cuda-vector-add
spec:
  restartPolicy: OnFailure
  containers:
    - name: cuda-vector-add
      # https://github.com/kubernetes/kubernetes/blob/v1.7.11/test/images/nvidia-cuda/Dockerfile
      image: "k8s.gcr.io/cuda-vector-add:v0.1"
      resources:
        limits:
          nvidia.com/gpu: 1 # requesting 1 GPU

How can I run this YAML file multiple times such that a new pod with a different name is created?

CodePudding user response：

Creating several similar objects to benchmark some component in Kubernetes, I would either sed the resources name from some file/template, eg:

#!/bin/sh

# make sure my-bench.yaml resource names are set to/based on PLACEHOLDER_NAME
for count in $(seq 1 10)
do
    sed "s|PLACEHOLDER_NAME|bench-$count|" my-bench.yaml | kubectl apply -f-
done

This can be useful when you have lots of objects, keeping your script readable.

When I don't have a lot of yaml to write, I would just use cat, eg:

#!/bin/sh

for count in $(seq 1 10)
do
    cat <<EOF | kubectl apply -f-
apiVersion: v1
kind: Pod
metadata:
  name: bench-$count
  namespace: my-bench-ns
spec:
...
EOF
done

While as suggested by @replicaSets and @karan525: when working with a deployment/replicaset/... you should be able to scale out, adding replicas.

CodePudding user response：

You can use replicas in spec. All pods created will have different names but the container in every one of them will be the same