Web archive

GeoServer is packaged as a standalone servlet for use with existing application servers such as Apache Tomcat and Jetty.


GeoServer has been mostly tested using Tomcat, and so is the recommended application server. GeoServer requires a newer version of Tomcat (7.0.65 or later) that implements Servlet 3 and annotation processing. Other application servers have been known to work, but are not guaranteed.


  1. Make sure you have a Java Runtime Environment (JRE) installed on your system. GeoServer requires a Java 11 or Java 17 environment,available from OpenJDK, Adoptium, or provided by your OS distribution.


    For more information about Java and GeoServer compatibility, please see the section on Java Considerations.

  2. Navigate to the GeoServer Download page.

  3. Select the version of GeoServer that you wish to download. If you’re not sure, select Stable release.

    These instructions are for GeoServer 2.26-SNAPSHOT which is provided as a Nightly release. Testing a Nightly release is a great way to try out new features, and test community modules. Nightly releases change on an ongoing basis and are not suitable for a production environment.

  4. Select Web Archive on the download page: geoserver-2.26.x-latest-war.zip

  5. Download and unpack the archive.

  6. Deploy the web archive as you would normally. Often, all that is necessary is to copy the geoserver.war file to the application server’s webapps directory, and the application will be deployed.


    A restart of your application server may be necessary.

Tomcat Hardening

Hide the Tomcat version in error responses and its error details.

To remove the Tomcat version, create following file with empty parameters

cd $CATALINA_HOME (where Tomcat binaries are installed)
mkdir -p ./lib/org/apache/catalina/util/
cat > ./lib/org/apache/catalina/util/ServerInfo.properties <<EOF

Additionally add to server.xml the ErrorReportValve to disable showReport and showServerInfo. This is used to hide errors handled globally by tomcat in host section.

vi ./conf/server.xml

Add to <Host name=... section this new ErrorReportValve entry:

     <Host name="localhost"  appBase="webapps"
           unpackWARs="true" autoDeploy="true">


       <Valve className="org.apache.catalina.valves.ErrorReportValve" showReport="false" showServerInfo="false" />


Why, if security by obscurity does not work?

Even though this is not the final solution, it at least mitigates the visible eye-catcher of outdated software packages.

Let’s take the attackers point of view.

Response with just HTTP status:

HTTP Status 400 – Bad Request

Ok, it looks like a Tomcat is installed.

Default full response:

HTTP Status 400 – Bad Request
Type Status Report
Message Invalid URI
Description The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).
Apache Tomcat/7.0.67

Ahh, great, the software is not really maintained. Tomcat is far outdated from Dec. 2015 (6 years old as of today Jan. 2022) with a lot of unfixed vulnerabilities.

Notice: For support reason, the local output of version.sh still outputs the current version

 Server number:  7.0.67


Use your container application’s method of starting and stopping webapps to run GeoServer.

To access the Web administration interface, open a browser and navigate to http://SERVER/geoserver . For example, with Tomcat running on port 8080 on localhost, the URL would be http://localhost:8080/geoserver.

If you see the GeoServer Welcome page, then GeoServer is successfully installed.


GeoServer Welcome Page


Update regularly at least the container application! And repeat the hardening process.

There are a lot of geoserver installations visible with outdated Tomcat versions.


  1. Stop the container application.

  2. Remove the GeoServer webapp from the container application’s webapps directory. This will usually include the geoserver.war file as well as a geoserver directory.