{"id":7180,"date":"2018-01-24T10:21:08","date_gmt":"2018-01-24T02:21:08","guid":{"rendered":"http:\/\/rmohan.com\/?p=7180"},"modified":"2018-01-24T12:16:30","modified_gmt":"2018-01-24T04:16:30","slug":"jenkins-on-centos-7","status":"publish","type":"post","link":"https:\/\/mohan.sg\/?p=7180","title":{"rendered":"Jenkins on CentOS 7"},"content":{"rendered":"
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Jenkins is a free and open source CI (Continuous Integration) tool which is written in JAVA. Jenkins is widely used for project development, deployment, and automation. Jenkins allows you to automate the non-human part of the whole software development process. It supports version control tools, including AccuRev, CVS, Subversion, Git, Mercurial, Perforce, ClearCase and RTC, and can execute Apache Ant, Apache Maven and sbt based projects as well as arbitrary shell scripts and Windows batch commands. The creator of Jenkins is Kohsuke Kawaguchi.[3] Released under the MIT License.Jenkins’ security depends on two factors: 1. access control 2. protection from external threats.<\/p>\n
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  1. Access control can be customized via two ways, user authentication and authorization.<\/li>\n
  2. Protection from external threats such as CSRF attacks and malicious builds is supported as well.<\/li>\n<\/ol>\n

    Requirements<\/h2>\n

    It does not require any special kind of hardware, you’ll only need a CentOS 7 server and a root user access over it. You can switch from non root user to root user using sudo -i<\/code> command.<\/p>\n

    Update System<\/h2>\n

    It is highly recommended to install Jenkins on a freshly updated server. To upgrade available packages and system run below given command and it’ll do the job for you.<\/p>\n

    yum -y update<\/code><\/p>\n

    Install Java<\/h2>\n

    Before going through the installation process of Jenkins you’ll need to set up Java Virtual Machine or JDK to your system. Simply run following command to install Java.<\/p>\n

    yum -y install java-1.8.0-openjdk.x86_64<\/code>Once installation is finished you can check the version to confirm the installation, to do run following command.<\/p>\n

    java -version<\/code>The above command will tell you about the installation details of java. By running the above command you should see the following result on your terminal screen.<\/p>\n

    openjdk version \"1.8.0_131\"<\/span>\r\nOpenJDK Runtime Environment (<\/span>build 1.8.0_131-b12)<\/span>\r\nOpenJDK 64-Bit Server VM (<\/span>build 25.131-b12, mixed mode)<\/span>\r\n<\/code><\/pre>\n
    Next, you’ll need to setup two environment variables JAVA_HOME<\/code> and JRE_HOME<\/code> and to do so run following commands one by one.<\/p>\n
    cp \/etc\/profile \/etc\/profile_backup<\/code>echo 'export JAVA_HOME=\/usr\/lib\/jvm\/jre-1.8.0-openjdk' | sudo tee -a \/etc\/profile<\/code>echo 'export JRE_HOME=\/usr\/lib\/jvm\/jre' | sudo tee -a \/etc\/profile<\/code>source \/etc\/profile<\/code>Finally print them for review using following commands.<\/p>\n
    echo $JAVA_HOME<\/code>You should see following output.<\/p>\n
    \/usr\/lib\/jvm\/jre-1.8.0-openjdk\r\n<\/code><\/pre>\n
    echo $JRE_HOME<\/code><\/p>\n<\/article>\n<\/div>\n
    shell scirpt<\/strong><\/p>\n<\/div>\n<\/div>\n
    #!\/bin\/sh<\/p>\n
    yum install -y java<\/p>\n
    wget -O \/etc\/yum.repos.d\/jenkins.repo http:\/\/pkg.jenkins-ci.org\/redhat\/jenkins.repo<\/p>\n
    rpm –import https:\/\/jenkins-ci.org\/redhat\/jenkins-ci.org.key<\/p>\n
    yum install -y jenkins<\/p>\n
    yum install -y git<\/p>\n
    service jenkins start\/stop\/restart<\/p>\n
    chkconfig jenkins on<\/p>\n<\/section>\n
     <\/p>\n
    java<\/p>\n
    java -version<\/p>\n
    java -jar jenkins.war –httpPort=8080<\/p>\n
    # get jenkin-cli<\/p>\n
    wget http:\/\/localhost:8080\/jnlpJars\/jenkins-cli.jar<\/p>\n
    # jenkin-cli install plugin<\/p>\n
    java -jar jenkins-cli.jar -s http:\/\/localhost:8080 install-plugin checkstyle cloverphp crap4j dry htmlpublisher jdepend plot pmd violations warnings xunit –username=yang –password=lljkl<\/p>\n
    # safe restart<\/p>\n
    java -jar jenkins-cli.jar -s http:\/\/localhost:8080 safe-restart –username=yang –password=lljkl<\/p>\n
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    Install Jenkins<\/h2>\n
    We have installed all the dependencies required by Jenkins and now we are ready to install Jenkins. Run following commands to install latest stable release of Jenkins.<\/p>\n
    wget -O \/etc\/yum.repos.d\/jenkins.repo https:\/\/pkg.jenkins.io\/redhat-stable\/jenkins.repo<\/code>rpm --import https:\/\/pkg.jenkins.io\/redhat-stable\/jenkins.io.key<\/code>The above two commands will add the jenkins repository and also import the key. If in case you have previously imported the key from Jenkins then the rpm --import<\/code> will fail because you already have a key. Please ignore that and move on.<\/p>\n
    Now run following command to install Jenkins on your server.<\/p>\n
    yum -y install jenkins<\/code>Next, you’ll need to start Jenkins services and set it to run at boot time and to do so use following commands.<\/p>\n
    systemctl start jenkins.service<\/code>systemctl enable jenkins.service<\/code><\/p>\n<\/article>\n<\/div>\n<\/div>\n<\/div>\n
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    Connecting to a Git Repo<\/h3>\n
    You will probably want to connect to a git repository next. This is also somewhat dependent on the operating system you use, so I provide the steps to do this on CentOS as well:<\/p>\n