[kubernates] 008. Pod Lifecycle

Pod Creation

1. kubectl → kube-apiserver → etcd → Deployment create
2. kube-controller-manager → Deployment detect → ReplicatSet create
3. kube-controller-manager → ReplicatSet detect → Pod create
4. kube-scheduler → node scheduling for pod → kube-apiserver → kubelet → containerd
5. kubelet → probe check → container

Service Connection

• kubelet → kube-proxy → request connect network → iptables update → calico connect to container

Secret Mount

• Mounted on the node’s memory area

HPA

• HPA metrics → kube-controller-manager → metrics-server → kubele -> containerd

Key Commands

• systemctl status kubelet : kubelet status check
• journalctl -u kubelet | tail -10 : kubelet logs check
• systemctl status containerd : containerd status check
• journalctl -u containerd | tail -10 : containerd logs check
• kubectl get nodes -o wide : node status check
• kubectl describe node k8s-master : node detail check
• kubectl get pods -A -o wide : pod status check
• kubectl get events -A : cluster events check
• kubectl events -n anotherclass-123 --types=Warning : warning events check
• kubectl logs -n anotherclass-123 <pod-name> --tail 10 : pod logs check
• kubectl logs -n anotherclass-123 <pod-name> -f : pod logs follow
• kubectl logs -n anotherclass-123 <pod-name> --since=1m : pod logs from last 1 minute

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