Configuration file - Locations and Configurations

In a Kubernetes cluster, the master node is responsible for managing the cluster's control plane components. These components include the API server, scheduler, controller manager, and etcd (the cluster's key-value store). Configuration files for these components are typically found in various locations on the master node. Here's an overview of some common configuration files and their locations:


How do you see your kube-api server in your existing cluster. It depends on how you setup your cluster. If you set it up with Kubeadm tool. Kubeadm deploys the kupe-api server as a Pod 

Location: /etc/kubernetes/manifests/kube-apiserver.yaml

In a non kube admin setup you can inspect the kube-api service 

cat /etc/systemd/system/kube-apiservice.service


kube-apiserver:

If kube-apiservers is installed using kubeadm tool

Location: /etc/kubernetes/manifests/kube-apiserver.yaml

Description: The kube-apiserver is the Kubernetes API server that exposes the Kubernetes API. It is the front-end for the Kubernetes control plane.

Configuration Options: Some common configuration options include:

--etcd-servers: Specifies the URL for connecting to etcd.

--service-cluster-ip-range: Defines the range of IP addresses for Kubernetes services.

kube-controller-manager:


Location: /etc/kubernetes/manifests/kube-controller-manager.yaml

Description: The kube-controller-manager runs controller processes that regulate the state of the cluster. It includes controllers such as Node Controller, Replication Controller, and Endpoints Controller.

Configuration Options: Some common configuration options include:

--leader-elect: Enables leader election for controller manager.

--use-service-account-credentials: Specifies whether to use service account credentials for the controller manager.

kube-scheduler:


Location: /etc/kubernetes/manifests/kube-scheduler.yaml

Description: The kube-scheduler is responsible for scheduling pods onto nodes in the cluster based on resource availability and scheduling policies.

Configuration Options: Some common configuration options include:

--kubeconfig: Specifies the path to the kubeconfig file for connecting to the Kubernetes API server.

--leader-elect: Enables leader election for the scheduler.

etcd:


Location: /etc/kubernetes/manifests/etcd.yaml (assuming static pod manifests are used)

Description: etcd is a distributed key-value store used by Kubernetes to store cluster state, configuration, and other important data.

Configuration Options: Some common configuration options include:

--data-dir: Specifies the directory path for storing etcd data.

--listen-peer-urls: Defines the URLs on which etcd listens for peer connections.

These are just a few examples of configuration files for Kubernetes master node components. The actual configuration may vary based on the specific deployment environment and configuration management practices. It's important to consult the official Kubernetes documentation and relevant documentation for your Kubernetes distribution for detailed information on configuration options and best practices. Additionally, always make sure to securely manage and maintain these configuration files to ensure the security and reliability of your Kubernetes cluster.




 

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