How to send Slack notification after a Jenkins pipeline build failed?

Question

I have a pipeline groovy script in Jenkins v2.19. Also I have a
"Slack Notification Plugin" v2.0.1 and "Groovy Postbuild Plugin" installed.

I can successfully send "build started" and "build finished" messages.

When a build fails, how can I send the "Build failed" message to a Slack channel?

Answer 1

Just in case if in Declarative Syntax,

Now, Jenkins provides post. You can check result at the end of pipeline.

https://jenkins.io/doc/book/pipeline/syntax/#post-example

Using like:

pipeline {
    stages { ... }
    post {
       // only triggered when blue or green sign
       success {
           slackSend ...
       }
       // triggered when red sign
       failure {
           slackSend ...
       }
       // trigger every-works
       always {
           slackSend ...
       }
    }
}

It would be used in every stage also. See the document link please.