How to create Pod from REST API

Question

How can I create a Pod using REST API ?

I checked the Kubernetes API documentation:
https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.10/#-strong-write-operations-strong--54

They are writing that need to use POST request:
POST /api/v1/namespaces/{namespace}/pods

I have this YAML of simple nginx pod:

cat > nginx-pod.yaml <<EOF
apiVersion: v1
kind: Pod
metadata:
  name: nginx1
spec:
  containers:
  - name: nginx
    image: nginx:1.7.9
    ports:
    - containerPort: 80
EOF

score 11 · Accepted Answer · answered Jul 04 '18 at 14:48

11

Need to translate the YAML file to JSON file:

cat > nginx-pod.json <<EOF
{
    "apiVersion": "v1",
    "kind": "Pod",
    "metadata": {
        "name": "nginx1"
    },
    "spec": {
        "containers": [
            {
                "name": "nginx",
                "image": "nginx:1.7.9",
                "ports": [
                    {
                        "containerPort": 80
                    }
                ]
            }
        ]
    }
}
EOF

Use the curl command like that:

curl -k -v -X POST -H "Authorization: Bearer <JWT_TOKEN>" -H "Content-Type: application/json" https://127.0.0.1:6443/api/v1/namespaces/default/pods -d@nginx-pod.json

Of course, the token you are using should have permissions to create pod.

If someone has a way to do it without converting to JSON, please share.

answered Jul 04 '18 at 14:48

E235

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Does this still work in Azure function? – justyy Oct 17 '22 at 09:43
1

It should work, it's a basic POST request – E235 Oct 17 '22 at 11:32
so, sending to 127.0.0.1 in azure function? – justyy Oct 17 '22 at 13:25
1

No, you will need to replace it with the master node IP. You can check it by running `kubectl cluster-info` – E235 Oct 18 '22 at 04:24
ok, but in Azure Function, I don't have access to "kubectl" – justyy Oct 18 '22 at 08:30
So how your run commands? for example, how you list the pods? – E235 Nov 02 '22 at 15:17
Anyway, notice that the question was about "REST API", I supposed this is not the case in your question so you need to check how to call API functions from Azure Function – E235 Nov 02 '22 at 15:20

score 5 · Answer 2 · answered Jul 30 '20 at 03:17

Adding an answer as per the author's request.

We can use the Yaml file directly as follows.

curl -k -X POST -H 'Content-Type: application/yaml' \
-H "Authorization: Bearer <JWT_TOKEN>" --data '
apiVersion: v1
kind: Pod
metadata:
  name: nginx1
spec:
  containers:
  - name: nginx
    image: nginx:1.7.9
    ports:
    - containerPort: 80
' "https://127.0.0.1:6443/api/v1/namespaces/default/pods"

One weird thing is that If I try to pass YAML file in curl's data(@file.yaml) It throws an error. Seems YAML content type doesn't accept binary hence I used cat to pass the contents. So the following will also work.

curl -k -X POST -H 'Content-Type: application/yaml' -H "Authorization: Bearer <JWT_TOKEN>"\
 --data "$(cat nginx-pod.yaml)" "https://127.0.0.1:6443/api/v1/namespaces/default/pods"

Reference:

Kubernetes API reference
Kubernetes Deployment curl example - Example 1 is created based on this.

How to create Pod from REST API

2 Answers2

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