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Cheedge Lee
Cheedge Lee

Posted on • Originally published at notes-renovation.hashnode.dev

CKA Quick Check Points -- Logs & Configs

#cka #kubernetes #log #config

Quick recap for logs & configs. Details can click the title link or check the official doc.

1. Log

1.1 Files

  • /var/log/
    • Pod: /var/log/pods/<namespace>/<pod-name>/<container-name>.log
    • Etcd: /var/log/etcd.log
    • kubelet: /var/log/syslog

1.2 CMD 

# 1. components log grep kubelet /var/log/syslog journalctl -u [kubectl|kube-controller-manager|kube-scheduler|kube-apiserver|etcd|docker|containerd] kubectl logs <pod-name> -n kube-system # 2. Pod log kubectl describe pod <pod-name> -n kube-system kubectl logs <pod-name> -c <container-name> # use crictl or docker (in case when docker is used) to check the logs and process # crictl ps/logs
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1.3 sidecar

sidecar container used for logging

official doc

2. Config

2.1 Files

  • /etc/kubernetes/: most k8s configuration files.
    • /etc/kubernetes/manifest: static pod config files
  • /var/lib/kubelet/: kubelet related data and configuration.
  • /var/lib/etcd/: etcd data.
  • /etc/systemd/system/: systemd service configuration files.

2.2 CMD 

# View the active kubeconfig settings. kubectl config view # check the corresponding pods kubectl describe pod <pod-name> -n kube-system # use systemctl cat systemctl cat [kubectl|kube-controller-manager|kube-scheduler|kube-apiserver|etcd|docker|containerd] # can even use find find / | grep kubeadm
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3. Context 

kubectl config current-context
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4. Jobs 

kubectl delete jobs --all kubectl get pods -w
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