Build images as part of Jenkins Worker on Kubernetes - docker

Question

I have Jenkins deployed on kubernetes (AWS EKS), and a node designated for the jenkins pipelines tasks.
I have a pipeline which I want to build a docker image, so here is how my pipelines looks:
pipeline {
agent {
kubernetes {
defaultContainer 'jnlp'
yaml """
apiVersion: v1
kind: Pod
spec:
nodeSelector:
illumex.ai/noderole: jenkins-worker
containers:
- name: docker
image: docker:latest
imagePullPolicy: Always
command:
- cat
tty: true
volumeMounts:
- mountPath: /var/run/docker.sock
name: docker-sock
volumes:
- name: docker-sock
hostPath:
path: /var/run/docker.sock
"""
}
}
stages {
stage('build') {
steps {
container('system') {
sh """
docker system prune -f
"""
However, my job fails with:
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
I think it's permissions issue. However, since the containers are created as part of the pipeline, so for which user I should give permission?

Answer 1

On your Jenkins machine, ensure docker is installed and the user jenkins is in the docker group.
Installing the docker plugin is not enough.
Same for kubectl must be installed on the Jenkins machine.
FROM jenkins/jenkins
ARG HOST_UID=1004
ARG HOST_GID=999
USER root
RUN apt-get -y update && \
apt-get -y install apt-transport-https ca-certificates curl gnupg-agent software-properties-common && \
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add - && \
add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) stable" && \
apt-get update && \
apt-get -y install docker-ce docker-ce-cli containerd.io
RUN curl -L "https://github.com/docker/compose/releases/download/1.26.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose \
&& chmod +x /usr/local/bin/docker-compose \
&& ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose \
&& curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
RUN echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | tee /etc/apt/sources.list.d/kubernetes.list \
&& apt-get -y update \
&& apt install -y kubectl
RUN usermod -u $HOST_UID jenkins
RUN groupmod -g $HOST_GID docker
RUN usermod -aG docker jenkins
FROM base
RUN kubectl version
USER jenkins