kubectl Commands
8 May 2023 · Read time 8 min
Installing kubectl
To use gcloud to install kubectl according to the Google GKE instructions:
gcloud components install kubectl
sudo apt-get install kubectl
Use curl to install kubectl according to the Kubernetes website:
curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
kubectl cluster-info dump
This is an expanded listing using the cluster info command (many hundreds of lines).
kubectl cluster-info dump
# Example response for a very long cluster information dump
# -----------------------------------------------------------
# {
# "kind": "NodeList",
# "apiVersion": "v1",
# "metadata": {
# "resourceVersion": "8685921"
# },
# "items": [
# {
# "metadata": {
# "name": "gke-cluster-1-default-pool-36e9706c-0fxb",
# "uid": "0b89edcc-d46b-4783-84f9-a7672f0bd922",
# ...
# ... several hundred lines
# ...
# 13. __clone @ 0x122293 in /usr/lib/x86_64-linux-gnu/libc-2.31.so
# (version 21.8.10.1.altinitystable (altinity build))
# 2023.04.14 06:24:31.919921 [ 115 ] {} <Debug> DNSResolver: Updated DNS cache
# 2023.04.14 06:24:35.915268 [ 54 ] {} <Debug> DiskLocal: Reserving 1.00 MiB on disk `default`, having unreserved 97.44 GiB.
# ==== END logs for container clickhouse of pod default/chi-first-first-1-1-0 ====
kubectl exec - Enter a ClickHouse pod
To enter the pod and run the ClickHouse client directly, first locate the nodename of the cluster using the watch or k9s or find it from the ACM.
kubectl exec -it chi-first-first-0-0-0 -- bash
# You are now inside the pod, run a list command:
root@chi-first-first-0-0-0:/# ls
## bin boot cloud-connect.pem dev docker-entrypoint-initdb.d entrypoint.sh etc home kubectl kubectl.sha256 lib lib32 lib64 libx32 media mnt opt proc root run sbin srv sys tmp usr var
# To exit out of the pod
exit
# ubuntu@ip-123-45-67-890:~$
kubectl get ns
This lists the currently registered Kubernetes namespaces in the current cluster-1 using the kubectl get ns command.
kubectl get ns command to list all of the namespaces.
kubectl get pod
List the CPU pods in a ClickHouse cluster.
kubectl get pod -o=custom-columns=NAME:.metadata.name,STATUS:.status.phase,NODE:.spec.nodeName
# Example response to list pods
# ------------------------------
# NAME STATUS NODE
# chi-first-first-0-0-0 Running gke-cluster-1-default-pool-36e9706c-xj7p
# chi-first-first-0-1-0 Running gke-cluster-1-default-pool-aa3988ca-nth7
# chi-first-first-1-0-0 Running gke-cluster-1-default-pool-36e9706c-0fxb
# chi-first-first-1-1-0 Running gke-cluster-1-default-pool-36e9706c-wrbm
kubectl get pvc
List the storage volumes.
kubectl get pvc
# Example response to list volumes
# --------------------------------
# NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
# pd-ssd-chi-first-first-0-0-0 Bound pvc-5bc72a03-2ae5-41d1-9e93-92b92829c435 100Gi RWO premium-rwo 8d
# pd-ssd-chi-first-first-0-1-0 Bound pvc-ec8f143d-c51d-4125-938a-76ad103fb7f2 100Gi RWO premium-rwo 8d
# pd-ssd-chi-first-first-1-0-0 Bound pvc-014d010b-d282-4b47-91ef-b332bd381a28 100Gi RWO premium-rwo 8d
# pd-ssd-chi-first-first-1-1-0 Bound pvc-c11d5819-1935-4b6f-ad54-60fa196fe013 100Gi RWO premium-rwo 8d
kubectl get all -n zoo1ns
To list the Zookeeper nodes:
kubectl get all -n zoo1ns
# Example response to list zookeeper nodes and services
# -----------------------------------------------------
# NAME READY STATUS RESTARTS AGE
# pod/zookeeper-0 1/1 Running 0 8d
#
# NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
# service/zookeeper ClusterIP 10.72.131.73 <none> 2181/TCP,7000/TCP 8d
# service/zookeepers ClusterIP None <none> 2888/TCP,3888/TCP 8d
#
# NAME READY AGE
# statefulset.apps/zookeeper 1/1 8d
kubectl describe storageclass
List Storage Classes. (See ACM 》 Resources Configuration 》 Storage Classes )
kubectl describe storageclass
# Example response to list all the storage
# ----------------------------------------
# Name: premium-rwo
# IsDefaultClass: No
# Annotations: components.gke.io/component-name=pdcsi,components.gke.io/component-version=0.13.7,components.gke.# io/layer=addon
# Provisioner: pd.csi.storage.gke.io
# Parameters: type=pd-ssd
# AllowVolumeExpansion: True
# MountOptions: <none>
# ReclaimPolicy: Delete
# VolumeBindingMode: WaitForFirstConsumer
# Events: <none>
#
#
# Name: standard
# IsDefaultClass: No
# Annotations: components.gke.io/layer=addon,storageclass.kubernetes.io/is-default-class=false
# Provisioner: kubernetes.io/gce-pd
# Parameters: type=pd-standard
# AllowVolumeExpansion: True
# MountOptions: <none>
# ReclaimPolicy: Delete
# VolumeBindingMode: Immediate
# Events: <none>
#
#
# Name: standard-rwo
# IsDefaultClass: Yes
# Annotations: components.gke.io/layer=addon,storageclass.kubernetes.io/is-default-class=true
# Provisioner: pd.csi.storage.gke.io
# Parameters: type=pd-balanced
# AllowVolumeExpansion: True
# MountOptions: <none>
# ReclaimPolicy: Delete
# VolumeBindingMode: WaitForFirstConsumer
# Events: <none>
kubectl config view
To verify the config file is updated with the correct credentials, review it by running the kubctl config view command.
kubctl config view.svg command to verify that the config file is updated with credentials.
gcloud container clusters list
This lists the current container information with the gcloud container clusters list command.
gcloud container clusters list command.
kubectl clusterinfo
Run the kubectl clusterinfo command to list the Kubernetes control plan and services.
At this point the Google set up is complete.
Now you can use Altinity.Cloud Anywhere to connect Google GKE to the Altinity Cloud Manager.
kubectl clusterinfo command.
kubectl version
The computer or cloud compute instance that you use to communicate with Google Cloud requires installation of the Google CLI and Kubernetes.
The following list of software needs to be installed:
- kubectl (
kubectl get namespaces)
version checks that some items you do not have
Checking Versions To make sure the prerequisites have been met, check the versions of the installed software.
# Version checks
kubectl version --short # v1.27.1
cat /etc/os-release # Ubuntu 20.04
altinitycloud-connect version # Altinity 0.20.0
gcloud version # Google Cloud SDK 429.0.0
kubectl version --short
# Client Version: v1.26.3
# Kustomize Version: v4.5.7
# Unable to connect to the server: net/http: TLS handshake timeout
# Another variation to display version
kubectl version --output=yaml
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