use the kubernetes api - Container Service for Kubernetes

The Kubernetes API provides a resource-based (RESTful) programming interface over HTTP. It supports standard HTTP requests, such as POST, PUT, PATCH, DELETE, and GET, to query, create, update, and delete cluster resources. You can use cURL commands or other programming methods to access the Kubernetes API. This topic provides examples of how to manage Pods and Deployments using cURL commands.

Obtain KubeConfig Access Credentials

Log on to the ACK console.
Click Go to RAM console to go to the Resource Access Management Quick Authorization page. Then, click Confirm.

After you grant the authorization, refresh the console to use ACK.
In the navigation pane on the left, click Clusters.
On the Clusters page, find the cluster that you want to manage and click the name of the cluster or click Details in the Actions column. The details page of the cluster appears.
Click the Connection Information tab. View the cluster access credential in the KubeConfig section. Save the KubeConfig file locally.

Run the following commands to extract CA, Key, and APIServer information from the KubeConfig file.

cat  ./kubeconfig |grep client-certificate-data | awk -F ' ' '{print $2}' |base64 -d > ./client-cert.pem
cat  ./kubeconfig |grep client-key-data | awk -F ' ' '{print $2}' |base64 -d > ./client-key.pem
APISERVER=`cat  ./kubeconfig |grep server | awk -F ' ' '{print $2}'`

Use cURL Commands to Operate the Kubernetes API

Run the following command to view all namespaces in the current cluster.

curl --cert ./client-cert.pem --key ./client-key.pem -k $APISERVER/api/v1/namespaces

The following examples show common operations for managing Pods and Deployments using cURL commands.

Common Pod Operations

Run the following command to view all Pods in the default namespace.

curl --cert ./client-cert.pem --key ./client-key.pem -k $APISERVER/api/v1/namespaces/default/pods

Run the following command to create a Pod in JSON format.

cat nginx-pod.json
{
    "apiVersion":"v1",
    "kind":"Pod",
    "metadata":{
        "name":"nginx",
        "namespace": "default"
    },
    "spec":{
        "containers":[
            {
                "name":"nginx",
                "image":"nginx:alpine",
                "ports":[
                    {
                        "containerPort": 80
                    }
                ]
            }
        ]
    }
}

curl --cert ./client-cert.pem --key ./client-key.pem -k $APISERVER/api/v1/namespaces/default/pods -X POST --header 'content-type: application/json' -d@nginx-pod.json

Run the following command to create a Pod in YAML format.

cat nginx-pod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: nginx
  namespace: default
spec:
  containers:
  - name: nginx
    image: nginx:alpine
    ports:
    - containerPort: 80

curl --cert ./client-cert.pem --key ./client-key.pem -k $APISERVER/api/v1/namespaces/default/pods -X POST --header 'content-type: application/yaml' --data-binary @nginx-pod.yaml

Run the following command to query the status of a Pod.

curl --cert ./client-cert.pem --key ./client-key.pem -k $APISERVER/api/v1/namespaces/default/pods/nginx

Run the following command to query the logs of a Pod.

curl --cert ./client-cert.pem --key ./client-key.pem -k $APISERVER/api/v1/namespaces/default/pods/nginx/log

Run the following command to query Pod metrics using the metric-server API.

curl --cert ./client-cert.pem --key ./client-key.pem -k $APISERVER/apis/metrics.k8s.io/v1beta1/namespaces/default/pods/nginx

Run the following command to delete a Pod.

curl --cert ./client-cert.pem --key ./client-key.pem -k $APISERVER/api/v1/namespaces/default/pods/nginx -X DELETE

Common Deployment Operations

The following is an example of a YAML file for creating a Deployment.

cat nginx-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deploy
  labels:
    app: nginx
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image:  nginx:alpine
        ports:
        - containerPort: 80
        resources:
          requests:
            cpu: "2"
            memory: "4Gi"

curl --cert ./client-cert.pem --key ./client-key.pem -k $APISERVER/apis/apps/v1/namespaces/default/deployments -X POST --header 'content-type: application/yaml' --data-binary @nginx-deploy.yaml

Run the following command to view a Deployment.

curl --cert ./client-cert.pem --key ./client-key.pem -k $APISERVER/apis/apps/v1/namespaces/default/deployments

Run the following command to update a Deployment by modifying the number of replicas.

curl --cert ./client-cert.pem --key ./client-cert.pem -k $APISERVER/apis/apps/v1/namespaces/default/deployments/nginx-deploy -X PATCH -H 'Content-Type: application/strategic-merge-patch+json' -d '{"spec": {"replicas": 4}}'

Run the following command to update a Deployment by modifying the container image.

curl --cert ./client-cert.pem --key ./client-cert.pem -k $APISERVER/apis/apps/v1/namespaces/default/deployments/nginx-deploy -X PATCH -H 'Content-Type: application/strategic-merge-patch+json' -d '{"spec": {"template": {"spec": {"containers": [{"name": "nginx","image": "nginx:1.7.9"}]}}}}'