79 lines
3.0 KiB
Markdown
79 lines
3.0 KiB
Markdown
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# Tomcat 10 container image
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## Description
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Apache Tomcat (Tomcat for short) is a free and open-source implementation of the
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Jakarta Servlet, Jakarta Expression Language, and WebSocket technologies. It
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provides a pure Java HTTP web server environment that can run Java code. It is a
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Java web application server and not a complete JEE application server.
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## Usage
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By default, the image launches Tomcat with the same configuration as the one
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that comes with SUSE Linux Enterprise Server. The difference is that logging is
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sent to stdout, meaning that the `podman logs tomcat` command displays Tomcat
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logs.
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For security reasons, the image runs as the **tomcat** user and is installed
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on a micro base container without a package manager.
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To deploy an application, copy the `.war` file into
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`$CATALINA_BASE/webapps` (either during a container build or by bind-mounting
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the directory), and launch the container using the following command:
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```ShellSession
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$ podman run -d --rm -p 8080:8080 registry.opensuse.org/opensuse/apache-tomcat:10.1-openjdk22
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```
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The deployed webapp is then accessible via `http://localhost:8080/$webapp_name`.
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### How to use the image with rootless Podman
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The container image can be used in rootless mode with Podman. Keep in mind that
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Podman remaps the `tomcat` user in the container to a different user on the
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host. This user does not have write access to the mounted directory. To avoid
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permission issues change permissions of the shared directory to `0777` as
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follows:
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```ShellSession
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$ chmod 0777 /path/to/my/app
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$ podman run --rm -d -v /path/to/my/app:/usr/share/tomcat/webapps:z \
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-p 8080:8080 registry.opensuse.org/opensuse/apache-tomcat:10.1-openjdk22
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```
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## Configuration
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The main Tomcat configuration files (for example
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`/etc/tomcat/logging.properties`) are stored in `/etc/tomcat/`.
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Tomcat's runtime options can be configured using the environment variables
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`JAVA_OPTS` and `CATALINA_OPTS`. `JAVA_OPTS` specifies general options used for
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the JVM, whereas `CATALINA_OPTS` specifies Tomcat's flags. You can pass the
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options to the container runtime using the `-e` flag:
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```ShellSession
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$ podman run -it --rm \
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-e JAVA_OPTS="-Xmx1024m" -p 8080:8080 \
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registry.opensuse.org/opensuse/apache-tomcat:10.1-openjdk22
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```
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The image ships with `CATALINA_HOME` set to `/usr/share/tomcat`
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and `CATALINA_BASE` set to `/usr/share/tomcat`.
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## Upgrading from Tomcat 9
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Tomcat 9 implements Java EE 8, and Tomcat 10
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implements Jakarta EE 9. Before upgrading from version 9, consult the
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[upstream migration guide](https://tomcat.apache.org/migration-10.html).
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## Licensing
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`SPDX-License-Identifier: MIT`
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This documentation and the build recipe are licensed as MIT.
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The container itself contains various software components under various open source licenses listed in the associated
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Software Bill of Materials (SBOM).
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This image is based on [openSUSE Tumbleweed](https://get.opensuse.org/tumbleweed/).
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