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kubectl-topology
A kubectl plugin that provides insight into the topology of a Kubernetes cluster.
Introduction
kubectl-topology provides insight into the topology of a Kubernetes cluster.
At the moment, this essentially means the distribution of nodes and pods across regions and zones:
$ kubectl topology pod --all-namespaces
NAMESPACE NAME NODE REGION ZONE
kube-system kube-dns-5f886bf8d8-s7pcc gke-gke-1-p-1-50120dfc-26gm europe-west1 europe-west1-d
kube-system kube-dns-5f886bf8d8-zhm42 gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system kube-dns-autoscaler-8687c64fc-d5jvm gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system kube-proxy-gke-gke-1-p-1-50120dfc-26gm gke-gke-1-p-1-50120dfc-26gm europe-west1 europe-west1-d
kube-system kube-proxy-gke-gke-1-p-1-7023cbca-cz4b gke-gke-1-p-1-7023cbca-cz4b europe-west1 europe-west1-c
kube-system kube-proxy-gke-gke-1-p-1-8e1077f6-17st gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system l7-default-backend-8f479dd9-dkspg gke-gke-1-p-1-50120dfc-26gm europe-west1 europe-west1-d
kube-system metrics-server-v0.3.1-5c6fbf777-z7jxq gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
ns-1 nginx gke-gke-1-p-1-7023cbca-cz4b europe-west1 europe-west1-c
kubectl-topology requires nodes to be adequately labeled with the
topology.kubernetes.io/{region,zone}
labels, or with their deprecated (as of Kubernetes 1.17) equivalents,
failure-domain.beta.kubernetes.io/{region,zone}
Installation
kubectl-topology can be installed using Krew:
$ kubectl krew install topology
Alternatively, kubectl-topology can be installed by running
$ go get github.com/bmcustodio/kubectl-topology/cmd/kubectl-topology
or by cloning this repository, running
$ make build
and copying ./bin/kubectl-topology to a directory in your $PATH.
Usage & examples
Node topology
To list nodes by zone and region, run
$ kubectl topology node
NAME REGION ZONE
gke-gke-1-p-1-50120dfc-26gm europe-west1 europe-west1-d
gke-gke-1-p-1-7023cbca-cz4b europe-west1 europe-west1-c
gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
To list nodes in a specific zone (e.g. europe-west1-b), run
$ kubectl topology node --zone europe-west1-b
NAME REGION ZONE
gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
To list nodes in a specific region (e.g. europe-west1), run
$ kubectl topology node --region europe-west1
NAME REGION ZONE
gke-gke-1-p-1-50120dfc-26gm europe-west1 europe-west1-d
gke-gke-1-p-1-7023cbca-cz4b europe-west1 europe-west1-c
gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
NOTE: --region and --zone are mutually exclusive.
Pod topology
To list pods across all namespaces and the region and zones they are in, run
$ kubectl topology pod --all-namespaces
NAMESPACE NAME NODE REGION ZONE
kube-system kube-dns-5f886bf8d8-s7pcc gke-gke-1-p-1-50120dfc-26gm europe-west1 europe-west1-d
kube-system kube-dns-5f886bf8d8-zhm42 gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system kube-dns-autoscaler-8687c64fc-d5jvm gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system kube-proxy-gke-gke-1-p-1-50120dfc-26gm gke-gke-1-p-1-50120dfc-26gm europe-west1 europe-west1-d
kube-system kube-proxy-gke-gke-1-p-1-7023cbca-cz4b gke-gke-1-p-1-7023cbca-cz4b europe-west1 europe-west1-c
kube-system kube-proxy-gke-gke-1-p-1-8e1077f6-17st gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system l7-default-backend-8f479dd9-dkspg gke-gke-1-p-1-50120dfc-26gm europe-west1 europe-west1-d
kube-system metrics-server-v0.3.1-5c6fbf777-z7jxq gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
ns-1 nginx gke-gke-1-p-1-7023cbca-cz4b europe-west1 europe-west1-c
To list pods in the europe-west1-b zone across all namespaces, run
$ kubectl topology pod --all-namespaces --zone europe-west1-b
NAMESPACE NAME NODE REGION ZONE
kube-system kube-dns-5f886bf8d8-zhm42 gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system kube-dns-autoscaler-8687c64fc-d5jvm gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system kube-proxy-gke-gke-1-p-1-8e1077f6-17st gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system metrics-server-v0.3.1-5c6fbf777-z7jxq gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
To list pods in the europe-west1 region across all namespaces, run
$ kubectl topology pod --all-namespaces --region europe-west1
NAMESPACE NAME NODE REGION ZONE
kube-system kube-dns-5f886bf8d8-s7pcc gke-gke-1-p-1-50120dfc-26gm europe-west1 europe-west1-d
kube-system kube-dns-5f886bf8d8-zhm42 gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system kube-dns-autoscaler-8687c64fc-d5jvm gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system kube-proxy-gke-gke-1-p-1-50120dfc-26gm gke-gke-1-p-1-50120dfc-26gm europe-west1 europe-west1-d
kube-system kube-proxy-gke-gke-1-p-1-7023cbca-cz4b gke-gke-1-p-1-7023cbca-cz4b europe-west1 europe-west1-c
kube-system kube-proxy-gke-gke-1-p-1-8e1077f6-17st gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
kube-system l7-default-backend-8f479dd9-dkspg gke-gke-1-p-1-50120dfc-26gm europe-west1 europe-west1-d
kube-system metrics-server-v0.3.1-5c6fbf777-z7jxq gke-gke-1-p-1-8e1077f6-17st europe-west1 europe-west1-b
ns-1 nginx gke-gke-1-p-1-7023cbca-cz4b europe-west1 europe-west1-c
To list pods in the europe-west1-c zone and in ns-1 only, run
$ kubectl topology pod --namespace ns-1 --zone europe-west1
NAMESPACE NAME NODE REGION ZONE
ns-1 nginx gke-gke-1-p-1-7023cbca-cz4b europe-west1 europe-west1-c
NOTE: --region and --zone are mutually exclusive.
License
Copyright 2020 bmcustodio
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.