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Viewing Resource Information: 1. Nodes: ShortCode = no A Node is a worker machine in Kubernetes and may be either a virtual or a physical machine, depending on the cluster. Each Node is managed by the control plane. A Node can have multiple pods, and the Kubernetes control plane automatically handles scheduling the pods across the Nodes in the cluster.
| Commands | Description |
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| kubectl get node | To list down all worker nodes. | | kubectl delete node <node_name> | Delete the given node in cluster. | | kubectl top node | Show metrics for a given node. | | kubectl describe nodes | grep ALLOCATED -A 5 | Describe all the nodes in verbose. | | kubectl get pods -o wide | grep <node_name> | List all pods in the current namespace, with more details. | | kubectl get no -o wide | List all the nodes with mode details. | | kubectl describe no | Describe the given node in verbose. | | kubectl annotate node <node_name> | Add an annotation for the given node. | | kubectl uncordon node <node_name> | Mark my-node as schedulable. | | kubectl label node | Add a label to given node |
2. Pods Shortcode = po Pods are the smallest deployable units of computing that you can create and manage in Kubernetes.
| Commands | Description |
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| kubectl get po | To list the available pods in the default namespace. |
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| kubectl describe pod <pod_name> | To list the detailed description of pod. |
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| kubectl delete pod <pod_name> | To delete a pod with the name. |
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| kubectl create pod <pod_name> | To create a pod with the name. |
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| Kubectl get pod -n <name_space> | To list all the pods in a namespace. |
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| Kubectl create pod <pod_name> -n <name_space> | To create a pod with the name in a namespace. |
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3. Namespaces Shortcode = ns In Kubernetes, namespaces provide a mechanism for isolating groups of resources within a single cluster. Names of resources need to be unique within a namespace, but not across namespaces.
| Commands | Description |
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| kubectl create namespace <namespace_name> | To create a namespace by the given name. |
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| kubectl get namespace | To list the current namespace in a cluster. |
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| kubectl describe namespace <namespace_name> | To display the detailed state of one or more namespaces. |
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| kubectl delete namespace <namespace_name> | To delete a namespace. |
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| kubectl edit namespace <namespace_name> | To edit and update the definition of a namespace. |
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4. Services Shortcode = services In Kubernetes, a Service is an abstraction which defines a logical set of Pods and a policy by which to access them (sometimes this pattern is called a micro-service).
| Commands | Description |
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| kubectl get services | To list one or more services. |
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| kubectl describe services <services_name> | To list the detailed display of services. |
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| kubectl delete services -o wide | To delete all the services. |
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| kubectl delete service < service_name> | To delete a particular service. |
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5. Deployments A Deployment provides declarative updates for Pods and ReplicaSets.The typical use case of deployments are to create a deployment to rollout a ReplicaSet, declare the new state of the pods and rolling back to an earlier deployment revision.
| Commands | Description |
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| kubectl create deployment <deployment_name> | To create a new deployment. |
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| kubectl get deployment | To list one or more deployments. |
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| kubectl describe deployment <deployment_name> | To list a detailed state of one or more deployments. |
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| kubectl delete deployment<deployment_name> | To delete a deployment. |
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6. DaemonSets A DaemonSet ensures that all (or some) Nodes run a copy of a Pod. As nodes are added to the cluster, Pods are added to them. As nodes are removed from the cluster, those Pods are garbage collected. Deleting a DaemonSet will clean up the Pods it created.
| Command | Description |
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| kubectl get ds | To list out all the daemon sets. |
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| kubectl get ds -all-namespaces | To list out the daemon sets in a namespace. |
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| kubectl describe ds [daemonset_name][namespace_name] | To list out the detailed information for a daemon set inside a namespace. |
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7. Events Kubernetes events allow us to paint a performative picture of the clusters.
| Commands | Description |
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| kubectl get events | To list down the recent events for all the resources in the system. |
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| kubectl get events --field-selector involvedObject.kind != Pod | To list down all the events except the pod events. |
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| kubectl get events --field-selector type != Normal | To filter out normal events from a list of events. |
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8. Logs Logs are useful when debugging problems and monitoring cluster activity. They help to understand what is happening inside the application.
| Commands | Description |
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| kubectl logs <pod_name> | To display the logs for a Pod with the given name. |
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| kubectl logs --since=1h <pod_name> | To display the logs of last 1 hour for the pod with the given name. |
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| kubectl logs --tail-20 <pod_name> | To display the most recent 20 lines of logs. |
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| kubectl logs -c <container_name> <pod_name> | To display the logs for a container in a pod with the given names. |
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| kubectl logs <pod_name> pod.log | To save the logs into a file named as pod.log. |
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9. ReplicaSets A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time. As such, it is often used to guarantee the availability of a specified number of identical Pods.
| Commands | Description |
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| kubectl get replicasets | To List down the ReplicaSets. |
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| kubectl describe replicasets <replicaset_name> | To list down the detailed state of one or more ReplicaSets. |
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| kubectl scale --replace=[x] | To scale a replica set. |
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10. Service Accounts A service account provides an identity for processes that run in a Pod.
| Commands | Description |
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| kubectl get serviceaccounts | To List Service Accounts. |
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| kubectl describe serviceaccounts | To list the detailed state of one or more service accounts. |
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| kubectl replace serviceaccounts | To replace a service account. |
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| kubectl delete serviceaccounts <name> | To delete a service account. |
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