In a Linux environment, Jenkins is typically installed and integrated with SVN to manage Maven-based projects. To begin, navigate to the Jenkins homepage and click on "Manage Jenkins," then select "Manage Plugins" to install necessary plugins such as SVN, Maven, and SSH.
Next, go back to the Jenkins home page and click on "Manage Jenkins" again, then choose "Global Tool Configuration" to set up tools like JDK and Maven.
After configuring the tools, the next step is to create a new job. On the Jenkins homepage, click "New Item," enter a name for your project, and select "Freestyle project."
You can then modify the project name and configure the source code management by adding the SVN repository URL along with the username and password.
When building the project, there are several scenarios. One common approach is to use Maven for the build process via the plugin. Another option involves using shell commands to build and deploy the application directly.
For deployment, you can use the "Deploy to Container Plugin" to publish the project to Tomcat. This requires the Tomcat username and password, which should be configured in the `tomcat-users.xml` file located in the Tomcat configuration directory.
Another method involves using shell scripts to build the project and deploy it manually. In this case, when starting Tomcat, make sure to include the command `export BUILD_ID=dontKillMe` to prevent the build from being killed.
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, you might encounter errors such as "Permission denied." This issue often arises because the Jenkins user does not have the required permissions to access certain directories or files.
To resolve this, first, check the ownership and permissions of the target directory. For instance, if the directory `/alidata/ejoined/server/apache-tomcat-8365` is owned by the root user, the Jenkins user may not have the necessary access rights.
To fix this, you can change the ownership of the directory or adjust its permissions using the `chmod` command. For example:
```bash
chmod -R 755 /alidata/ejoined/server/apache-tomcat-8365
```
Additionally, ensure that the Jenkins service is running under the correct user account. The configuration file for Jenkins is usually located at `/etc/sysconfig/jenkins`. Open this file and modify the `JENKINS_USER` parameter to the desired user, such as `root`.
After making these changes, restart the Jenkins service using the command:
```bash
service jenkins restart
```
Once the service is restarted, try rebuilding the project through Jenkins. If everything is configured correctly, the build and deployment should succeed without permission issues.
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