[Jenkins] 1. Install Jenkins

(1.) Download and install JavaSDK（Java SE Development Kit）

​http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html​

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(2.) Download Jenkins from https://jenkins.io/download/​

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(3.) After installing it, you will see this screen:

Use Finder to navigate into '/Users/Shared/Jenkins/Home/' and modify the permission of secrets folder, then open initialAdminPassword file, copy the password.

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(4.) Install suggested plugins

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(5.) Create your first admin user

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(6.) Finally you will get this screen