kubectl not found error in jenkins pipeline - kubernetes

Question

stage('Deploy Test chart') {
steps{
container('ubuntu-kubectl-helm') {
script {
kubeconfig(credentialsId: 'kubeconfig-test'){
sh "which kubectl"
sh "kubectl config view"
sh "kubectl get nodes"
sh "kubectl get pods -n jenkins-new"
sh "kubectl get pods -n test"
}
}
}
}
}
We have 3 containers to run the whole pipeline. and we create an Ubuntu container to run Kubernetes on it(we have install kubectl on it). when we run this step as a part of the whole pipe line. It gives us errors.
ERROR: Failed to run "kubectl version". Returned status code 127.
stdout:
sh: 47: kubectl: not found
But when we run this step separately as a pipeline, then the pipeline is working and we get the results.Now we are stuck and not able to figure out how to proceed further.
We also checked the environment path and checked if it was running on the Ubuntu container or not.

Answer 1

Inside Jenkins you need to install kubectl. Same if you want to use docker in your pipeline.
Here my Dockerfile which does it.
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
USER jenkins