K8s Components

Kube-apiserver

  1. Authenticate user

  2. Validate request

  3. Retrieve data

  4. Update ETCD

  5. Scheduler

  6. Kubelet

  • In kube-apiserver service we define location of etcd server --etcd-server=https://127.0.0.1:2379

  • View api-server option

cat /etc/kubernetes/manifests/kube-apiserver.yaml
cat /etc/systemd/system/kube-apiserver.service
ps -aux | grep kube-apiserver

Kube-controller manager

  • Watch Status

  • Remediate situation

  • Node Monitor Period = 5s

  • Node Monitor Grace Period = 40s

  • Pod Eviction Timeout = 5m

Different Controllers in kube control manager

  • Node Controller

  • PV-Binder Controller

  • Replication Controller

  • Service account controller

  • Stateful-Set

  • Replicaset

  • CronJob

  • Job Controller

  • PV Protection Controller

  • Deployment Controller

  • Namespace Controller

  • Endpoint Controller

Kube Scheduler:

  1. Filter Nodes

  2. Rank Nodes

Kubelet:

  1. Register Node

  2. Create Pods

  3. Monitor node & Pods

  • With the command, kubeadm doesn't deploy kubelet by default

Kube-proxy:

  • Deployed as daemonset on cluster

PreviousETCDNextK8s Objects

Last updated