Github webhooks - pre-push hooks

Question

My requirement is that whenever developers are pushing to github, then before the push a CI build should trigger on Jenkins server. If that build fails, then push to github

Answer 1

This isn't generally the workflow possible with GitHub.
You would rather use a "guarded commits" model with 2 GitHub repo:

• one for pushing, where you can enable a CI service like, for instance, Travis (or your own CI server),
• one for valid commits (the ones that passed CI), pushed by Travis (as in this question), and used by developer to sync their repo (pull only, no push)

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that's what the requirement is for my project, which can't be changed

In that case, It is best to follow Building a CI server which will:

• detect the pushes and trigger a compilation
• push back on dedicated branch for valid comimt (it could be the master branch for instance)

That means the devs should push only to a "dev" branch, monitored by your server, and your CI engine would push those commits to the master branch if the compilation passes.