How to set up envVars in container in Jenkins pipeline with Kubernetes plugin - kubernetes

Question

I'm setting up a Jenkins pipeline with Kubernetes, there is an option to set environment variables for a container in containerTemplate. Is there some option to override those values in container i.e.:
container(
name: 'my-container',
envVars: [
envVar(key: $KEY, value: $VALUE)
]) {
...
}
because some variables are derived during build stages and cannot be set up in podTemplate. The example above unfortunately does not work.

Answer 1

Note that as of this writing as per the docs:
The container statement allows to execute commands directly into each container. This feature is considered ALPHA as there are still some problems with concurrent execution and pipeline resumption
I believe there is not an option. However, you can try setting the variables in the sh command. For example:
def label = "mypod-${UUID.randomUUID().toString()}"
podTemplate(label: label, containers: [
containerTemplate(name: 'maven', image: 'maven:3.3.9-jdk-8-alpine', ttyEnabled: true, command: 'cat'),
containerTemplate(name: 'golang', image: 'golang:1.8.0', ttyEnabled: true, command: 'cat')
]) {
node(label) {
stage('Get a Maven project') {
git 'https://github.com/jenkinsci/kubernetes-plugin.git'
container('maven') {
stage('Build a Maven project') {
sh 'MYENV1=value1 MYEVN2=value2 mvn -B clean install'
}
}
}
stage('Get a Golang project') {
git url: 'https://github.com/hashicorp/terraform.git'
container('golang') {
stage('Build a Go project') {
sh """
mkdir -p /go/src/github.com/hashicorp
ln -s `pwd` /go/src/github.com/hashicorp/terraform
MYENV1=value1 MYEVN2=value2 cd /go/src/github.com/hashicorp/terraform && make core-dev
"""
}
}
}
}
}