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Kubernetes cheat sheet
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| # See logs of K8s cluster | |
| https://kubernetes.io/docs/tasks/debug-application-cluster/debug-cluster/#looking-at-logs | |
| # show k8s api-server logging | |
| sudo journalctl -u kube-apiserver --follow | |
| #see https://kubernetes.io/docs/reference/kubectl/cheatsheet/ | |
| # Retrieve cluster info | |
| kubectl cluster-info dump | |
| # every component with namespace kube-system | |
| kubectl get all --namespace kube-system | |
| # every component | |
| kubectl get all --all-namespaces | |
| # etcd | |
| ## get all etcd entries | |
| ETCDCTL_API=3 etcdctl --endpoints=https://127.0.0.1:2379 --cacert=/etc/etcd/ca.pem --cert=/etc/etcd/kube-apiserver.pem --key=/etc/etcd/kube-apiserver-key.pem get / --prefix --keys-only | |
| # Networking | |
| kubectl get nodes --output json | |
| # Flannel logging | |
| kubectl logs -n kube-system kube-flannel-ds-cw7kf -c kube-flannel | |
| kubectl get pod kube-flannel-ds-cw7kf --namespace kube-system -o yaml | |
| # Kube-DNS | |
| kubectl describe pods -l k8s-app=kube-dns -n kube-system | |
| kubectl get nodes --output=jsonpath='{range .items[*]}{.status.addresses[?(@.type=="InternalIP")].address} {.spec.podCIDR} {"\n"}{end}' | |
| # CoreDNS | |
| kubectl describe pod/coredns-65db874f4f-lz5hl --namespace kube-system |
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