Kubernetes Cluster

A Kubernetes cluster is a set of nodes that run containerized applications. This guide explains how to integrate on-prem Kubernetes clusters with Cloudaware.

To see how Cloudaware seamlessly integrates with Kubernetes Cluster in action, request a demo.

Prerequisites

If the Kubernetes cluster is private, configure the TunHub gateway first. Use the TunHub route URL, e.g., https://tunhub.cloudaware.com:12345 as Cluster URL.

Add a Kubernetes cluster

Log in to Cloudaware → Admin.
Find Kubernetes in integrations. Click +ADD.
Fill out the form:
WHERE
Cluster Name – the cluster name
Cluster URL – the cluster URL^*

*If Kubernetes cluster is public, use the direct web link.

If Kubernetes cluster is private, install the Breeze agent, set up TunHub gateway and use the TunHub route URL, e.g., https://tunhub.cloudaware.com:12345.

Select one of the following authentication methods:

Option 1: Kubernetes certificate

1) Select Using Kubernetes Certificate. Click GET NEW CERTIFICATE REQUEST.

2) Enter the username that will be utilized in Kubernetes. Click Generate. The certificate in .csr format is generated.

3) Sign the Cloudaware certificate request that will be used by Kubernetes control plane node. For example:

CODE

openssl x509 -req -in cloudaware_test.csr -CA /etc/kubernetes/pki/ca.crt -CAkey /etc/kubernetes/pki/ca.key -CAcreateserial -out cloudaware_test.crt -days 3650

4) Configure RBAC authorization for the user. Create a custom Cluster role node-reader to allow Cloudaware to fetch cluster node data:

CODE

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: node-reader
rules:
- apiGroups: [""]
  resources: ["nodes"]
  verbs: ["get", "watch", "list"]

Create a role binding. For example:

CODE

kubectl create -f cloudaware-user.yaml

Two bindings are in use. The first binds the default view role; the second binds the custom node-reader role:

CODE

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: cloudaware_test-binding
subjects:
- kind: User
  name: cloudaware_test
  namespace: default
  apiGroup: ""
roleRef:
  kind: ClusterRole
  name: view
  apiGroup: ""
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: cloudaware_test-binding2
subjects:
- kind: User
  name: cloudaware_test
  namespace: default
  apiGroup: ""
roleRef:
  kind: ClusterRole
  name: node-reader
  apiGroup: ""

5) Once the certificate is signed, go back to Cloudaware. Click UPLOAD SIGNED CERTIFICATE and upload the certificate file. Click Save.

Option 2: Kubernetes service account

Ensure kubectl is installed and configured.

1) Select Using Kubernetes Service Account.

2) Launch kubectl to access the cluster that will be added to Cloudaware. Create required Kubernetes objects with the following manifest:

CODE

apiVersion: v1
kind: ServiceAccount
metadata:
 name: cloudaware-sa
 namespace: default
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
 name: cloudaware-node-reader
rules:
- apiGroups: [""]
 resources: ["nodes"]
 verbs: ["get", "watch", "list"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
 name: cloudaware-node-reader-binding
subjects:
- kind: ServiceAccount
 name: cloudaware-sa
 namespace: default
 apiGroup: ""
roleRef:
 kind: ClusterRole
 name: cloudaware-node-reader
 apiGroup: ""
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
 name: cloudaware-view-binding
subjects:
- kind: ServiceAccount
 name: cloudaware-sa
 namespace: default
 apiGroup: ""
roleRef:
 kind: ClusterRole
 name: view
 apiGroup: ""

The manifest creates a service account cloudaware-sa and grants it with the cluster-wide read-only access, along with the permissions to get/list/watch cluster nodes. Learn more on Kubernetes RBAC here.

2) Save the manifest to a file, e.g. cloudaware-sa.yaml, and apply it:

CODE

kubectl create -f cloudaware-sa.yaml

3) Retrieve the service account token:

CODE

kubectl get secret $(kubectl get secret | awk '/cloudaware-sa/{print $1}') -o jsonpath={.data.token} | base64 -d

The token is stored as a Kubernetes secret. This command reads and decodes it. Learn more on Service Account Tokens here.

4) Go back to Cloudaware. Paste the service account token in the integration form. Click SAVE.

A green light in the ‘Status’ column indicates a successful configuration. If the light is red, contact support@cloudaware.com.
To view Kubernetes-related data, go to Cloudaware CMDB Navigator. Select KUBERNETES in the left-hand menu.

List of Kubernetes objects

Cloudaware supports the following Kubernetes objects:

Kubernetes Cluster CA10K__CaKubernetesCluster__c
Kubernetes Cluster Config Map CA10K__CaKubernetesClusterConfigMap__c
Kubernetes Cluster Daemon Set CA10K__CaKubernetesClusterDaemonSet__c
Kubernetes Cluster Deployment CA10K__CaKubernetesClusterDeployment__c
Kubernetes Cluster Endpoint CA10K__CaKubernetesClusterEndpoint__c
Kubernetes Cluster HPA CA10K__CaKubernetesClusterHpa__c
Kubernetes Cluster Ingress CA10K__CaKubernetesClusterIngress__c
Kubernetes Cluster Limit Range CA10K__CaKubernetesClusterLimitRange__c
Kubernetes Cluster Namespace CA10K__CaKubernetesClusterNamespace__c
Kubernetes Cluster Network Policy CA10K__CaKubernetesClusterNetworkPolicy__c
Kubernetes Cluster Network Policy Rule CA10K__CaKubernetesClusterNetworkPolicyRule__c
Kubernetes Cluster Node CA10K__CaKubernetesClusterNode__c
Kubernetes Cluster Node Address CA10K__CaKubernetesClusterNodeAddress__c
Kubernetes Cluster Pod CA10K__CaKubernetesClusterPod__c
Kubernetes Cluster Pod Container CA10K__CaKubernetesClusterPodContainer__c
Kubernetes Cluster Pod Disruption Budget CA10K__CaKubernetesClusterPodDisruptionBudget__c
Kubernetes Cluster Replica Set CA10K__CaKubernetesClusterReplicaSet__c
Kubernetes Cluster Resource Quota CA10K__CaKubernetesClusterResourceQuota__c
Kubernetes Cluster Role CA10K__CaKubernetesClusterRole__c
Kubernetes Cluster Role Binding CA10K__CaKubernetesClusterRoleBinding__c
Kubernetes Cluster Secret CA10K__CaKubernetesClusterSecret__c
Kubernetes Cluster Service CA10K__CaKubernetesClusterService__c
Kubernetes Cluster Service Account CA10K__CaKubernetesClusterServiceAccount__c
Kubernetes Cluster Service Account Secret CA10K__CaKubernetesClusterServiceAccSecret__c
Kubernetes Cluster Stateful Set CA10K__CaKubernetesClusterStatefulSet__c
Kubernetes Cluster Storage Class CA10K__CaKubernetesClusterStorageClass__c