Kubectl Plugin

Kruise-tools provides commandline tools for kruise features, such as kubectl-kruise, which is a standard plugin of kubectl.

Install

Install via Krew

  1. Krew itself is a kubectl plugin that is installed and updated via Krew (yes, Krew self-hosts). First, install krew.

  2. Run kubectl krew install kruise to install kruise plugin via Krew.

  3. Then you can use it with kubectl-kruise or kubectl kruise.

  1. $ kubectl-kruise --help
  3. # or
  4. $ kubectl kruise --help

Install manually

  1. You can simply download the binary from the releases page. Currently linux, darwin(OS X), windows with x86_64 and arm64 are provided. If you are using some other systems or architectures, you have to download the source code and execute make build to build the binary.

  2. Extract and move it to system PATH.

  1. $ tar xvf kubectl-kruise-darwin-amd64.tar.gz
  2. $ mv darwin-amd64/kubectl-kruise /usr/local/bin/
  1. Then you can use it with kubectl-kruise or kubectl kruise.
  1. $ kubectl-kruise --help
  3. # or
  4. $ kubectl kruise --help

Upgrade

Upgrade via Krew

Run kubectl krew upgrade kruise to upgrade kruise plugin via Krew.

Upgrade manually

Same to install plugin manaully.

Usage

expose

Take a workload(e.g. deployment, cloneset), service or pod and expose it as a new Kubernetes Service.

  1. $ kubectl kruise expose cloneset nginx --port=80 --target-port=8000

scale

Set a new size for a Deployment, ReplicaSet, CloneSet, or Advanced StatefulSet.

  1. $ kubectl kruise scale --replicas=3 cloneset nginx

It equals to kubectl scale --replicas=3 cloneset nginx.

rollout

Available commands: history, pause, restart, resume, status, undo, approve.

  1. $ kubectl kruise rollout undo cloneset/nginx
  3. # built-in statefulsets
  4. $ kubectl kruise rollout status statefulsets/sts1
  6. # kruise statefulsets
  7. $ kubectl kruise rollout status statefulsets.apps.kruise.io/sts2
  9. # approve a kruise rollout resource named "rollout-demo" in "ns-demo" namespace
  10. $ kubectl-kruise rollout approve rollout-demo -n ns-demo

set

Available commands: env, image, resources, selector, serviceaccount, subject.

  1. $ kubectl kruise set env cloneset/nginx STORAGE_DIR=/local
  3. $ kubectl kruise set image cloneset/nginx busybox=busybox nginx=nginx:1.9.1

migrate

Currently it supports migrate from Deployment to CloneSet.

  1. # Create an empty CloneSet from an existing Deployment.
  2. $ kubectl kruise migrate CloneSet --from Deployment -n default --dst-name deployment-name --create
  4. # Create a same replicas CloneSet from an existing Deployment.
  5. $ kubectl kruise migrate CloneSet --from Deployment -n default --dst-name deployment-name --create --copy
  7. # Migrate replicas from an existing Deployment to an existing CloneSet.
  8. $ kubectl-kruise migrate CloneSet --from Deployment -n default --src-name cloneset-name --dst-name deployment-name --replicas 10 --max-surge=2

exec

Support switch to raw terminal mode, sends stdin to ‘bash’ in working sidecar container from cloneset myclone or pod and sends stdout/stderr from ‘bash’ back to the client

  1. # exec sidecar in pod
  2. $ kubectl kruise exec mypod -S sidecar-container -i -t -- bash

scaledown

Scaledown a cloneset with selective Pods.

  1. # Scale down 2 with  selective pods
  2. $ kubectl kruise scaledown cloneset/nginx --pods pod-a,pod-b

It will decrease replicas=replicas-2 of this cloneset and delete the specified pods.