Jenkins plugin to access Kubernetes API

[olivier blanc]

I am looking for a Jenkins plugin to interact with kubernetes api from jenkins pipeline.

Is there such a plugin ?

Thanks

Olivier

[James Nord]

Why do you want a plugin? Logic is best done in scripts that can be debugged locally outside of Jenkins leaving pipeline to do orchestration and reporting.  Is there a reason you can not use kubectl directly?

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[olivier blanc]

I have a first version that works fine with scripts, I am trying to figure out if using API could be easier for my users.

The point is that I am running Jenkins outside kubernetes.

So to access Kube master, I have to open ssh and run kubectl with command line arguments, or prepare either Yaml/Json datas and send then through the Api.

All datas to build the pods are determine dynamically during the pipeline.

Thanks for your suggestions and help

Olivier

[JonathanRRogers]

There are several Kubernetes plugins, but I suspect the "Kubernetes Cli" plugin might be most applicable to your situation.

https://plugins.jenkins.io/kubernetes-cli

[sagar utekar]

Have you solved this issue, I am also looking for solution for same thing.

[olivier blanc]

I tried Kubernetes cli plugin and it feets pretty well to my needs.
Regards
Olivier

[olivier blanc]

Here is a code example :

label = "worker-${UUID.randomUUID().toString()}"

cloudName="MyCloudNameDefinedInJenkinsMainConfiguration"

podTemplate (

    cloud: cloudName,

    label: label,

    yaml: """

apiVersion: v1

kind: Pod

metadata:

  labels:

    some-label: ${label}

spec:

  containers:

    - name: jnlp

      image: ${registry_docker}/dgfip/jnlp-slave-k8s:latest

    - name: maven-jdk8

      image: ${registry_docker}/tools/maven:3.5.3-jdk-8

      imagePullPolicy: Always

      command:

      - cat

      tty: true

      volumeMounts:

      - mountPath: /root/.m2

        name: m2

  volumes: 

    - name: m2

      persistentVolumeClaim:

        claimName: m2-pvc

  imagePullSecrets:

    - name: regsecret-registry

"""

)

{

    node (label) {

      stage('Préparation environnement')

{
           
          // Example to create namespace
                name =" myNamespace"

nom_secret_k8s = "regsecret-registry"

user_secret_k8s = "dockerUser"

pass_secret_k8s="dockerPassword"

email_secret_k8s="nor...@somehost.somedomain"
                auth="${user_secret_k8s}:${pass_secret_k8s}".bytes.encodeBase64().toString()

json='{"auths":{"https://my-registry:port":{"username":"${user_secret_k8s}","password":"${pass_secret_k8s}","email":"${email_secret_k8s}","auth":"${auth}"}}}'

yamlStructure = [

"apiVersion": "v1",

"data": [

".dockerconfigjson": "${json}.bytes.encodeBase64().toString()

],

"kind": "Secret",

"metadata": [

"name": "${nom_secret_k8s}",

"namespace": "${name}"

],

"type": "kubernetes.io/dockerconfigjson"

]

yamlSecretFile= "${WORKSPACE}/${env.BUILD_TAG}_secret.yaml"

writeYaml file: yamlSecretFile, data: yamlStructure

withKubeConfig(

caCertificate: kube_ca,

credentialsId: kube_credentials,

serverUrl: kube_api_url

) {

script {

try {

sh "kubectl create namespace ${name} && kubectl apply -f ${yamlSecretFile} --validate=false"

}

catch (error) {

print "creating namespace and/or secret :"

print error.toString()

print error.getMessage()

print error.printStackTrace()

throw error

}

finally {

sh " rm ${yamlSecretFile}"

}

}

}

...

You will have to deal with string replacement in the last part. But this is the idea.

You also hava to setup properly you kubernetes cli  configuration in jenkins main configuration.

You will also have to provide a JNLP slave client with Kubectl installed.

Here is the Dockerfile that I used :

FROM jenkinsci/jnlp-slave:alpine

MAINTAINER Me M...@SomeDomain.com>

ENV KUBE_LATEST_VERSION="v1.12"

USER root

WORKDIR /

RUN apk add --update -t deps curl tar gzip ca-certificates git \

 && curl -L https://storage.googleapis.com/kubernetes-release/release/${KUBE_LATEST_VERSION}/bin/linux/amd64/kubectl -o /usr/local/bin/kubectl \

 && chmod +x /usr/local/bin/kubectl \

 && apk del --purge deps \

 && rm /var/cache/apk/*

USER jenkins

Let me know if you need more