Example of a working pod with the kubernetes-ci plugin

[Sébastien Douche]

Hi folks,
I try with the kubernetes-ci to create a pod with a container to do some
work (get source code, compile it, etc) and a jnlp container (only used
to connect to the Jenkins server). The goal is to avoid the adding of
the jnlp binary into all my containers. So I tried this:

----------------------------------------
apiVersion: "v1"
kind: "Pod"
metadata:
name: "k8s-slave"
labels:
name: "k8s-slave"
spec:
containers:
- name: "jenkins-slave"
image: "jenkinsci/jnlp-slave"
volumeMounts:
- mountPath: /home/jenkins
name: workspace-volume
env:
- name: "JENKINS_URL"
value: "https://XXX"
- name: "golang"
image: "golang:1.6.3-alpine"
volumeMounts:
- mountPath: /home/jenkins
name: workspace-volume
volumes:
- emptyDir: {}
name: workspace-volume
----------------------------------------

And a trivial job which try to access on the golang container:

----------------------------------------
git clone https://github.com/hashicorp/terraform.git
mkdir -p /go/src/github.com/hashicorp
ln -s `pwd` /go/src/github.com/hashicorp/terraform
cd /go/src/github.com/hashicorp/terraform && make core-dev
----------------------------------------

It doesn't work 'cause the job have access on the jnlp fs and not the
golang one. What is missing to access on the golang container?



Thanks.


--
Sébastien Douche <s...@nmeos.net>
Twitter: @sdouche
http://douche.name

[Carlos Sanchez]

You can't just jump from a container to another, can only share through network or shared filesystem.
http://kubernetes.io/docs/user-guide/pods/

I suggest using the Kubernetes Jenkins plugin that can do exactly what you want using pipeline
https://github.com/jenkinsci/kubernetes-plugin/blob/master/README.md#pipeline-support

[Sébastien Douche]

On Wed, Nov 23, 2016, at 22:12, Carlos Sanchez wrote:

Hi Carlos

> I suggest using the Kubernetes Jenkins plugin that can do exactly what
> you want using pipeline
> https://github.com/jenkinsci/kubernetes-plugin/blob/master/README.md#pipeline-support

Doesn't work for me:
https://issues.jenkins-ci.org/browse/JENKINS-39695

[Daniel Serodio]

Hi Carlos,

I'm trying to understand how composing multiple containers (one with the JNLP slave, another with Maven) in a Pod Template but I can't get the example pipeline to work. The Jenkins logs show that it's "Waiting for slave to connect", and after 100 tries it gives up, deletes the Pod and creates a new one ad infinitum.

Using "kubectl get pods" I can see that the 2 containers have been created and the Pod is running, but it won't connect to the Jenkins master.

The example pipeline uses a maven and a golang images, but none of them knows how to connect to Jenkins using JNLP. The README says that "The jnlp agent image used can be customized by adding it to the template", but it seems that I need to include a JNLP image in the pod template so that it can talk to Jenkins.

[Carlos Sanchez]

On Tue, Dec 6, 2016, 22:37 Daniel Serodio <dser...@gmail.com> wrote:

Hi Carlos,

I'm trying to understand how composing multiple containers (one with the JNLP slave, another with Maven) in a Pod Template but I can't get the example pipeline to work. The Jenkins logs show that it's "Waiting for slave to connect", and after 100 tries it gives up, deletes the Pod and creates a new one ad infinitum.

Using "kubectl get pods" I can see that the 2 containers have been created and the Pod is running, but it won't connect to the Jenkins master.

You need to get the pod logs to see why it is not connecting. kubectl logs pods/... jnlp

The example pipeline uses a maven and a golang images, but none of them knows how to connect to Jenkins using JNLP. The README says that "The jnlp agent image used can be customized by adding it to the template", but it seems that I need to include a JNLP image in the pod template so that it can talk to Jenkins.

On Wednesday, November 23, 2016 at 7:12:24 PM UTC-2, Carlos Sanchez wrote:

You can't just jump from a container to another,  can only share through network or shared filesystem.
http://kubernetes.io/docs/user-guide/pods/

I suggest using the Kubernetes Jenkins plugin that can do exactly what you want using pipeline
https://github.com/jenkinsci/kubernetes-plugin/blob/master/README.md#pipeline-support

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[Joe Rhaman]

Carlos,

This Plugin clearly doesn't work.... Please provide a detailed how to at least rather on how this works.

This is turning out to be a complete waste of time. 

Joe

[Carlos Sanchez]

On Saturday, January 28, 2017 at 6:36:55 PM UTC+1, Joe Rhaman wrote:

Carlos,

This Plugin clearly doesn't work.... Please provide a detailed how to at least rather on how this works.

This is turning out to be a complete waste of time. 

Considering that are over 1200 installations, I think it is safe to assume that it does work for most people.

There are examples at https://github.com/jenkinsci/kubernetes-plugin

As I mentioned in the previous mail, in order to see why pods can't connect to jenkins you need to get the pod logs in Kubernetes side: kubectl logs pods/{your pod id} jnlp

[Vamsi krishna]

@carlos   

i checked the logs but there is nothing showing in the logs.... jenkins is running outside of the cluster.. so i cant use the jenkins if i run outside the cluster.

[Carlos Sanchez]

Yes it totally does. You need to open the ports from agent to master

On Tue, Mar 20, 2018, 21:19 Fadi Al-Farah <fara...@gmail.com> wrote:

I'm also interested in this.. Does this plugin support having a Jenkins master running somewhere else and the slaves in the k8s cluster?

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