[SOLVED] Jenkins CLI to install Jenkins plugins

Jenkins CLI to install Jenkins plugins - error UnknownHostException

I'm trying to use Jenkins CLI to install a Jenkins plugin with command:

java -jar jenkins-cli.jar -s http://localhost:8080 -auth @cred install-plugin https://updates.jenkins.io/download/plugins/htmlpublisher/1.31/htmlpublisher.hpi

and got the error

Installing a plugin from https://updates.jenkins.io/download/plugins/htmlpublisher/1.31/htmlpublisher.hpi

ERROR: Unexpected exception occurred while performing install-plugin command.
java.net.UnknownHostException: updates.jenkins.io
        at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:229)
        at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.base/java.net.Socket.connect(Socket.java:609)
        at java.base/sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:305)
        at java.base/sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)
        at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:182)
        at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:507)
        at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:602)
        at java.base/sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:266)
        at java.base/sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:373)
        at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:207)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1187)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1081)
        at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:193)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1592)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1520)
        at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:250)
        at java.base/java.net.URL.openStream(URL.java:1165)
        at org.apache.commons.io.FileUtils.copyURLToFile(FileUtils.java:1068)
        at hudson.cli.InstallPluginCommand.run(InstallPluginCommand.java:110)
        at hudson.cli.CLICommand.main(CLICommand.java:251)
        at hudson.cli.CLIAction$ServerSideImpl.run(CLIAction.java:299)
        at hudson.cli.CLIAction$1.lambda$opened$0(CLIAction.java:154)
        at java.base/java.lang.Thread.run(Thread.java:829)

What I have tried out:

Using another server: java -jar jenkins-cli.jar -s http://localhost:8080 -auth @cred install-plugin https://get.jenkins.io/plugins/htmlpublisher/1.31/htmlpublisher.hpi and got the same error
Install a similar plugin from the Jenkins UI and this worked successfully.

Jenkins version: Jenkins 2.401.2

Appreciate for your help.

Solution

You can also try to directly download the hpi file and install it:

A logged-in Jenkins administrator may upload the file from within the web UI:

Navigate to the Manage Jenkins > Manage Plugins page in the web UI.
Click on the Advanced tab.
Choose the .hpi file under the Upload Plugin section.
Upload the plugin file.
Restart Jenkins master in order the changes to take effect.