How to install a plugin in Jenkins manually

Installing a plugin from the Update center results in:

Checking internet connectivity Failed to connect to http://www.google.com/. Perhaps you need to configure HTTP proxy? Deploy Plugin Failure - Details hudson.util.IOException2: Failed to download from http://updates.jenkins-ci.org/download/plugins/deploy/1.9/deploy.hpi

Is it possible to download the plugin and install it manually into Jenkins?

Yes, you can. Download the plugin (*.hpi file) and put it in the following directory:

<jenkinsHome>/plugins/

Afterwards you will need to restart Jenkins.

1. Download the plugin.
2. Inside Jenkins: Manage Jenkins → Manage Plugins → There is a tab called Advanced and on that page there is an option to upload a plugin (the extension of the file must be hpi).

Sometimes, when you download plugins you may get (.zip) files then just rename with (.hpi) and use the UI to install the plugin.

If you use Docker, you should read this file: https://github.com/cloudbees/jenkins-ci.org-docker/blob/master/plugins.sh

Example of a parent Dockerfile:

FROM jenkins
COPY plugins.txt /plugins.txt
RUN /usr/local/bin/plugins.sh /plugins.txt

plugins.txt

<name>:<version>
<name2>:<version2>