Trigger a build on applying a tag

Question

I want to achieve the following:

1. Anyone in the dev team creates a tag i.e. Demo_Build_1 to dev branch.
2. TeamCity should be able to detect this new tag and build only this tag.

I have enabled "treat tag as a branch" checkbox in VCS configuration.

I have tried configuring it but I am not able to get it working. Following is my VCS setting:
and following is how I have configured my build trigger:

I don't want to trigger a build manually. My idea is that TeamCity should be able to pick up this new tag and run the build. Any pointers to achieve this objective would be helpful.

Answer 1

You've got it nearly right. You can use configuration parameter teamcity.vcsTrigger.runBuildInNewEmptyBranch=true to tell TeamCity to build on tag creation -- https://youtrack.jetbrains.com/issue/TW-43606. Otherwise TeamCity won't trigger a build when you see a new tag.