How can I make Jenkins CI with Git trigger on pushes to master

Question

I m trying to set up Jenkins-ci for a project using GitHub  I ve already set up Jenkins with the appropriate plugins  I want Jenkins to run build scripts only whenever someone on the project pushes to master  So far I ve been able to set it up so that a build will be triggered anytime anyone pushes to anywhere  but that is too broad  I ve done this with post-receive service hooks on Git   I ve read the Jenkins wiki  and a couple of tutorials  but this particular detail is missing    is it something to do with polling maybe  Or should work be done on the Git side  so that Git only triggers Jenkins when master is changed

User · Answer

As of version 0 5  the GitHub plugin for Jenkins can trigger a build when a change is pushed to GitHub

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For GitLab  use these steps    Go to your project s settings   Web hooks Enter the  Build Now  URL from your Jenkins project as a Push Event URL   http   server com jenkins job project name build delay 0sec for example Click Add Web Hook and then test hook   Then any time you commit to the repository  the web hook is triggered and a build is created  Be sure to set your Jenkins workspace to delete workspace before each build so you get a fresh copy of the new code

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In my current organization  we don t do this in master but do do it on both develop and release  branches  we are using Git Flow   in order to generate snapshot builds   As we are using a multi branch pipeline  we do this in the Jenkinsfile with the when   syntax      stage       when            expression                branch  develop                      This is detailed in this blog post  https   jenkins io blog 2017 01 19 converting-conditional-to-pipeline  longer-pipeline

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As already noted by gezzed in his comment  meanwhile there is a good solution  described in Polling must die  triggering Jenkins builds from a Git hook     Set the Jenkins job s build trigger to Poll SCM  but do not specify a schedule  Create a GitHub post-receive trigger to notify the URL  http   yourserver jenkins git notifyCommit url  lt URL of the Git repository gt  token  lt get token from git to build remotely gt   This will trigger all builds that poll the specified Git repository  However  polling actually checks whether anything has been pushed to the used branch    It works perfectly

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Manage Jenkins  configure system  GitHub Servers  On jenkins job   git credentials and Branch Specifier  give the branch you want to look for pushes       Webhook on github

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Continuous Integration with Jenkins  after code is pushed to repository from Git command  GUI    Create a job in Jenkins with only job name and select type of the project freestyle  Click OK  The next page doesn t add anything - just click Save  Go to the your local Git repository where you have the source code and navigate to the  git hooks folder  The hooks folder contains the few files  Check for the  post-commit   If not present  create a file   post-commit  without a file extension   C  work test   git hooks post-commit  Edit the  post-commit  file with the below command  Make sure it is present in your local source code hooks folder   curl -u userName apiToken -X POST http   localhost 8080 jenkins job jobName build token apiToken   Example   curl -u admin f1c55b3a07bb2b69b9dd549e96898384 -X POST http   localhost 8080 jenkins job Gitcommittest build token f1c55b3a07bb2b69b9dd549e96898384   5   userName  Jenkins user name  jobName  Job name of the build  apiToken  To get your API token  go to your Jenkins user page  top right in the interface   It is available in the  Configure  menu on the left of the page   Show API token  Make changes in your source code and commit the code to repository  Your job  http   localhost 8080 jenkins job Gitcommittest   should be building

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You need to specify the branch  By default it listens to anything  See the blog post Hudson  Git and Maven plugins

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My solution for a local git server   go to your local git server hook directory  ignore the existing update sample and create a new file literally named as  update   such as   gituser me   project git hooks  pwd  home gituser project git hooks gituser me   project git hooks  cat update    bin sh echo  XXX from  update file  curl -u admin 11f778f9f2c4d1e237d60f479974e3dae9 -X POST http   localhost 8080 job job4 pullsrc buildcontainer build token 11f778f9f2c4d1e237d60f479974e3dae9  exit 0 gituser me   project git hooks     The echo statement will be displayed under your git push result  token can be taken from your jenkins job configuration  browse to find it  If the file  update  is not called  try some other files with the same name without extension  sample    That s all you need

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Use the pull request builder plugin  https   wiki jenkins-ci org display JENKINS GitHub pull request builder plugin  It s really straightforward  You can then setup GitHub webhooks to trigger builds

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I hope this helps  How to trigger a Jenkins build on Git commit  It s just a matter of using curl to trigger a Jenkins job using the Git hooks provided by Git   The command curl http   localhost 8080 job someJob build delay 0sec can run a Jenkins job  where someJob is the name of the Jenkins job   Search for the  hooks  folder in your hidden  git folder  Rename the  post-commit sample  file to  post-commit   Open it with Notepad  remove the    Nothing  line and paste the above command into it   That s it  Whenever you do a commit  Git will trigger the post-commit commands defined in the file

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Not related to Git  but below I will help with the Jenkins job configuration in detail with Mercurial  It may help others with a similar problem    Install the URL Trigger Plugin Go to the job configuration page and select Poll SCM option  Set the value to           Check the option   URLTrigger  - Poll with a URL  Now you can select some options like modification date change  URL content  etc  In the options  select URL content change  select first option     Monitor change of content Save the changes    Now  trigger some change to the Mercurial repository by some test check-ins   See that the Jenkins job now runs by detecting the SCM changes  When the build is run due to Mercurial changes  then  you will see text Started by an SCM change  Else  the user who manually started it

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Instead of triggering builds remotely  change your Jenkins project configuration to trigger builds by polling   Jenkins can poll based on a fixed internal  or by a URL   The latter is what you want to skip builds if there are not changes for that branch  The exact details are  in the documentation  Essentially you just need to check the  Poll SCM  option  leave the schedule section blank  and set a remote URL to hit JENKINS URL job name polling   One gotcha if you have a secured Jenkins environment is unlike  build  the  polling URL requires authentication  The instructions here have details   For example  I have a GitHub Post-Receive hook going to username apiToken JENKIS URL job name polling

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Above answers are correct but i am addressing to them who are newbie here for their simplicity   especially for setting build trigger for pipeline   Consider you have two Github branches  1 master  2 dev  and Jenkinsfile  where pipeline script is written  and other files are available on each branch   Configure new Pipeline project  for dev branch     1 Code integration with git-plugin and cron based approach Prerequisite git plugin should be installed and configure it with your name and email    General section Check checkbox -  This project is parameterized    and add Name-SBRANCH Default Value- refs remotes origin dev  Build triggers section  Check checkbox -  Poll SCM  and schedule as per need for checking commits e g     1          to check every minute Pipeline definition section Select - Pipeline script from SCM     select git     addRepository URL    add git credentials     choose advanced     add Name- origin  RefSpec-   refs heads dev refs remotes origin dev  dev is github branch       Branches to build -   SBRANCH   Parameter name from ref 1st point      Script Path     Jenkinsfile      Uncheck Lightweightcheckout Apply     save     2 Code integration  github-plugin and webhook approach Prerequisite Github plugin should be installed and Github server should be configured  connection should be tested if not consider following configuration  Configure Github plugin with account on Jenkins  GitHub section Add Github server if not present API URL  https   api github com Credentials  Add secret text  Click add button  select type secret text  with value Personal Access Token  Generate it from your Github accounts     settings     developer setting     personal access token     add token     check scopes     copy the token  Test Connection     Check whether it is connected to your Github account or not Check checkbox with Manage Hooks In advance sub-section just select previous credential for  shared secret   Add webhook if not added to your repository by   Go to Github Repository setting      add webhook     add URL http   Public IP Jenkins PORT github-webhook  Or if you don t have Public IP use ngrok  Install  authenticate  get public IP from command   ngrok http 80 use your jenkins port  then add webhook      add URL http   Ngrok IP github-webhook  Test it by delivering payload from webhook page and check whether you get 200 status or not    If you have Github Pull requests plugin configure it also with published Jenkins URL    General section Check checkbox -  Github project  add project URL - github link ending with   git    General section Check checkbox -  This project is parameterized  and add Name-SBRANCH Default Value- refs remotes origin dev  Build triggers section Check checkbox -  GitHub hook trigger for GITScm polling  Pipeline def n section  Select - Pipeline script from SCM     select git     addRepository URL     add git credentials    choose advanced     add Name- origin  RefSpec-   refs heads dev refs remotes origin dev   dev is github branch        Branches to build -   SBRANCH   Parameter name from ref 1 st point      Script Path     Jenkinsfile     Uncheck Lightweightcheckout Apply     save

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Generic Webhook Trigger Plugin can be configured with filters to achieve this   When configured with   A variable named ref and expression   ref  A filter with text  ref and filter expression like  refs heads master     Then that job will trigger for every push to master  No polling   You probably want more values from the webhook to actually perform the build  Just add more variables  with JSONPath  to pick what you need   There are some use cases here  https   github com jenkinsci generic-webhook-trigger-plugin tree master src test resources org jenkinsci plugins gwt bdd

[git] How can I make Jenkins CI with Git trigger on pushes to master?

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