Jenkins automated deployment

In a Linux environment, Jenkins is installed and integrated with SVN to manage a Maven-based project. To begin, navigate to the Jenkins homepage and click on "Manage Jenkins," then select "Manage Plugins" to install essential plugins such as Subversion (SVN), Maven, and SSH. After installing the necessary plugins, go back to the Jenkins home page and click on "Manage Jenkins" again, this time selecting "Global Tool Configuration." Here, configure tools like JDK and Maven to ensure they are correctly set up for your project. Next, create a new job by clicking on "New Item" from the Jenkins home page. Choose a free-style project and give it a meaningful name. Once the project is created, you can modify its settings as needed. In the project configuration, add the SVN repository URL and provide the username and password for access. When building the project, there are several scenarios to consider. One common approach is to use Maven for the build process via the plugin release method. Post-build actions can be configured using the "Deploy to Container Plugin" to deploy the application to a Tomcat server. This requires setting up the Tomcat user in the `tomcat-users.xml` file located in the `conf` directory of your Tomcat installation. Another option is to use shell commands for both building and deploying the project. When starting Tomcat through a script, it's important to include the command `export BUILD_ID=dontKillMe` to prevent the build process from being terminated prematurely. Here is an example of a deployment script: ```bash export BUILD_ID=dontKillMe rm -rf /alidata/ejoined/server/apache-tomcat-8365/webapps/ROOT cp -R /var/lib/jenkins/workspace/adsl-taobao-admin/target/ROOT.war /alidata/ejoined/server/apache-tomcat-8365/webapps/ tomcatpath="/alidata/ejoined/server/apache-tomcat-8365" pid=$(ps -ef | grep java | grep ${tomcatpath} | awk '{print $2}') kill -9 $pid rm -rf ${tomcatpath}/work/Catalina/localhost/* sleep 1 ${tomcatpath}/bin/startup.sh ``` However, some issues may arise, such as permission errors during execution. For instance, the script might fail with a "Permission denied" error. This often occurs because the Jenkins user does not have the necessary permissions to access certain directories or files. To resolve this, check the ownership and permissions of the target directories. Use the `chmod -R 755` command to grant appropriate permissions. Additionally, verify that the Jenkins service is running under the correct user account. Modify the Jenkins configuration file located at `/etc/sysconfig/jenkins`. Change the `JENKINS_USER` parameter to the desired user, such as `root`, and restart the Jenkins service with `service jenkins restart`. Once these changes are made, re-run the build process. You should now see successful results without any permission-related issues. This ensures a smooth and reliable automated deployment workflow.

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