How to troubleshoot plugin installation failure in Jenkins?

To resolve the issue of failed Jenkins plugin installation, you can try the following methods:

1. Check the internet connection of Jenkins: Make sure the Jenkins server can access the internet in order to download and install plugins. You can try accessing the internet through a browser or test the network connection using the curl command.
2. Check the Jenkins plugin source configuration: Log in to the Jenkins admin interface, go to “Manage Jenkins” -> “Manage Plugins” -> “Advanced” tab, make sure the plugin source configuration is correct. You can try switching the mirror address of the plugin source or use the default plugin source.
3. Restart Jenkins service: Try restarting the Jenkins service to ensure that previous installation attempts did not cause conflicts. You can restart the service through the Jenkins management interface or via the command line.
4. Manually install plugins: If you’re unable to install a plugin through the plugin management interface, you can try manually installing it. First, locate the plugin’s HPI file (with a .hpi extension) in Jenkins’ plugin directory (default is JENKINS_HOME/plugins), then copy the file to that directory. Finally, restart the Jenkins service, and the plugin should be automatically loaded.
5. Check Jenkins logs: Examine the error messages in Jenkins’ log files (located in JENKINS_HOME/logs by default) for more detailed information about any plugin installation failures. Based on the error messages in the logs, you can attempt to take appropriate corrective action.

If the above methods still do not solve the problem, consider upgrading Jenkins to the latest version or consult the Jenkins community or relevant forums for further assistance.