0.0/ 16 # Expose a different port range for NodePort services service_node_port_range: 30000- 32767 pod_security_policy: false # Enable AlwaysPullImages Admission controller plugin # Available as of v0.2.0 always_pull_images: false secrets_encryption_config: enabled: true Kubernetes API Server Options Services: kube-api: # IP range for any services created on Kubernetes # This must match the service_cluster_ip_range in kube-controller service_cluster_ip_range: 10.43. The Kubernetes API REST service, which handles requests and data for all Kubernetes objects and provide shared state for all the other Kubernetes components. This only applies to Rancher v2.0.5 and v2.0.6. Note for Rancher 2 users If you are configuring Cluster Options using a Config File when creating Rancher Launched Kubernetes, the names of services should contain underscores only: kube_api. These snapshots can be used to restore etcd.īy default, RKE will deploy a new etcd service, but you can also run Kubernetes with an external etcd service. You can enable etcd to take recurring snapshots. It also supports adding and removing etcd nodes to the cluster. RKE supports running etcd in a single node mode or in HA cluster mode.
Etcd is a reliable, consistent and distributed key-value store. Kubernetes uses etcd as a store for cluster state and data. To configure advanced options for Kubernetes services such as kubelet, kube-controller, and kube-apiserver that are not documented below, see the extra_args documentation for more details. Note: All services support additional custom arguments, Docker mount binds, and extra environment variables. Based on the roles of the node, the containers deployed may be different. For more, see the CNI project page on GitHub.To deploy Kubernetes, RKE deploys several core components or services in Docker containers on the nodes. You just learned a bit about the usage of CNI for networking within Kubernetes. There are many aspects of container orchestration and management with Kubernetes. Hence, there are multiple CNI plugins that do things differently to satisfy various use cases. And as you know, networking is a complex topic with a variety of user needs. Why are there multiple plugins?ĬNI provides the specifications for various plugins. Note: CNI plugins are executable and support ADD, DEL, CHECK, VERSION commands, as discussed above. The CNI plugin performs the required operations and reports the result.ĬNI is called twice by K8s (kubelet) to set up loopback and eth0 interfaces for a pod.The container runtime also provides related network configuration and container-specific data to the plugin.When the container runtime expects to perform network operations on a container, it (like the kubelet in the case of K8s) calls the CNI plugin with the desired command.
#WHAT IS KUBERNETES KUBELET HOW TO#
Get started with Red Hat OpenShift Service on AWS.Interactive course: Create a cluster in Red Hat OpenShift Service on AWS with S….Interactive course: Getting started with OpenShift.ADD creates a new network interface for the container, and details of what is to be added are passed to CNI via JSON payload. The container runtime calls the CNI plugin with verbs such as ADD, DEL, CHECK, etc. The container/pod initially has no network interface. Where does CNI fit in?ĬNI is used by container runtimes, such as Kubernetes (as shown below), as well as Podman, CRI-O, Mesos, and others. It then assigns an IP address to the interface and sets up the routes consistent with the IP Address Management section by invoking the appropriate IP Address Management (IPAM) plugin. What is CNI?Ī CNI plugin is responsible for inserting a network interface into the container network namespace (e.g., one end of a virtual ethernet (veth) pair) and making any necessary changes on the host (e.g., attaching the other end of the veth into a bridge). This article de-mystifies what CNI means and does. If you have worked with Kubernetes (K8s) and tried to learn some of its inner workings, either on the job or in a training course, you must have learned a bit about Container Network Interface (CNI).
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