75 lines
2.7 KiB
Markdown
75 lines
2.7 KiB
Markdown
|
# Tomcat 9 container image
|
||
|
|
|
||
|
|
|
||
|
|
## Description
|
||
|
|
Apache Tomcat (Tomcat for short) is a free and open-source implementation of the
|
||
|
|
Jakarta Servlet, Jakarta Expression Language, and WebSocket technologies. It
|
||
|
|
provides a pure Java HTTP web server environment that can run Java code. It is a
|
||
|
|
Java web application server and not a complete JEE application server.
|
||
|
|
|
||
|
|
|
||
|
|
## Usage
|
||
|
|
By default, the image launches Tomcat with the same configuration as the one
|
||
|
|
that comes with SUSE Linux Enterprise Server. The difference is that logging is
|
||
|
|
sent to stdout, meaning that the `podman logs tomcat` command displays Tomcat
|
||
|
|
logs.
|
||
|
|
|
||
|
|
For security reasons, the image runs as the **tomcat** user and is installed
|
||
|
|
on a micro base container without a package manager.
|
||
|
|
|
||
|
|
To deploy an application, copy the `.war` file into
|
||
|
|
`$CATALINA_BASE/webapps` (either during a container build or by bind-mounting
|
||
|
|
the directory), and launch the container using the following command:
|
||
|
|
```ShellSession
|
||
|
|
$ podman run -d --rm -p 8080:8080 registry.opensuse.org/opensuse/apache-tomcat:9-openjdk17
|
||
|
|
```
|
||
|
|
|
||
|
|
The deployed webapp is then accessible via `http://localhost:8080/$webapp_name`.
|
||
|
|
|
||
|
|
|
||
|
|
### How to use the image with rootless Podman
|
||
|
|
|
||
|
|
The container image can be used in rootless mode with Podman. Keep in mind that
|
||
|
|
Podman remaps the `tomcat` user in the container to a different user on the
|
||
|
|
host. This user does not have write access to the mounted directory. To avoid
|
||
|
|
permission issues change permissions of the shared directory to `0777` as
|
||
|
|
follows:
|
||
|
|
|
||
|
|
```ShellSession
|
||
|
|
$ chmod 0777 /path/to/my/app
|
||
|
|
$ podman run --rm -d -v /path/to/my/app:/usr/share/tomcat/webapps:z \
|
||
|
|
-p 8080:8080 registry.opensuse.org/opensuse/apache-tomcat:9-openjdk17
|
||
|
|
```
|
||
|
|
|
||
|
|
|
||
|
|
## Configuration
|
||
|
|
|
||
|
|
The main Tomcat configuration files (for example
|
||
|
|
`/etc/tomcat/logging.properties`) are stored in `/etc/tomcat/`.
|
||
|
|
|
||
|
|
Tomcat's runtime options can be configured using the environment variables
|
||
|
|
`JAVA_OPTS` and `CATALINA_OPTS`. `JAVA_OPTS` specifies general options used for
|
||
|
|
the JVM, whereas `CATALINA_OPTS` specifies Tomcat's flags. You can pass the
|
||
|
|
options to the container runtime using the `-e` flag:
|
||
|
|
```ShellSession
|
||
|
|
$ podman run -it --rm \
|
||
|
|
-e JAVA_OPTS="-Xmx1024m" -p 8080:8080 \
|
||
|
|
registry.opensuse.org/opensuse/apache-tomcat:9-openjdk17
|
||
|
|
```
|
||
|
|
|
||
|
|
The image ships with `CATALINA_HOME` set to `/usr/share/tomcat`
|
||
|
|
and `CATALINA_BASE` set to `/usr/share/tomcat`.
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
## Licensing
|
||
|
|
|
||
|
|
`SPDX-License-Identifier: MIT`
|
||
|
|
|
||
|
|
This documentation and the build recipe are licensed as MIT.
|
||
|
|
The container itself contains various software components under various open source licenses listed in the associated
|
||
|
|
Software Bill of Materials (SBOM).
|
||
|
|
|
||
|
|
This image is based on [openSUSE Tumbleweed](https://get.opensuse.org/tumbleweed/).
|