How to Trigger Jenkins Job from Slack

Jenkins job can be triggered in many ways using poll SCM, webhooks. Well, you can also trigger a Jenkins job from Slack as well.  We will be leveraging Slash commands feature from Slack.

Slash Commands allow users to invoke your app by typing a string into the message composer box.

Pre-requisites:
Make sure you have already created a channel in Slack.

Steps in Jenkins:

Create a Token for the build job you want to trigger from Slack
Go to Jenkins --> Click on the Job you would like to trigger from Slack --> Configure
Go to build triggers section.

We will be using the following URL to trigger builds from Slack
http://jenkins_dns_name/job/jobName/build?token=myToken

Allow anonymous read only access
Go to Manage Jenkins --> Configure Global security, click on Allow anonymous read only access.
Apply, Save.

Steps in Slack:

1. Go to the channel from where you would like to trigger builds.

2. Channel settings --> Click on Integrations --> Add an app

Type slash commands and add it

Click on view in app directory

Click on Add to Slack

Enter a command - single word something like /build (it should be one word no spaces or characters)

Click on Add Slash command integration
Enter Jenkins URL, like mentioned below:
http://jenkins_dns_name/job/jobName/build?token=myToken

Method as GET

and scroll down click on the check box like below

And click Save integration

Go to channel, enter the command as shown below:
/build

and press enter

Now your build job should run instantly in Jenkins.