By default, Tomcat will start with a command line interface for configuration, but it’s also possible to run Tomcat in a Docker container with a plugin.
This plugin allows you to start Tomcat as a Docker daemon, but that doesn’t necessarily mean you’re ready to use Tomcat.
To do this, you need to install the Apache Tomcats Plugin SDK, and you can find it on Maven Central.
The plugin is available on MCP, but we’ll be covering this plugin in our next article.
The Tomcat plugin is a very powerful and versatile plugin that can be used to run Docker containers in a standalone environment.
The plugins Maven plugin and the Tomcat daemon, both have similar features, but the former is built specifically to run in Docker containers.
Tomcat provides a powerful command-line interface for managing Tomcat instances.
You can start a Tomcat instance and then configure it to use Docker, or you can use a Docker registry, like Docker Swarm or Tomcat Cloud.
The following example shows how you can start Tomcats Docker container on a Docker server.
You should be able to run a Tomcats instance in Docker on a Linux host using the following command:The Tomcats Maven Plugin plugin will then create a Docker file named docker.tomcat and load it into a Docker instance on your machine.
You will then need to specify the hostname, the port, and the host’s IP address, so that Docker knows how to listen on that port.
The configuration for a TomCat Docker container is quite straightforward.
You need to create a new container and specify its IP address.
You’ll need to tell Tomcat which hostname to use and which port to listen for.
You also need to configure the Docker registry so that Tomcat knows how many containers it should have on the host.
Next, you’ll need a TomCatch file that lists all of the TomCatches that are available on the local machine, as well as the ports that the Tomcats container should be listening on.
If you run TomCatching in a container on an external network, the TomCat containers will be listening in ports that are defined in the TomCache.tomcache file.
In this example, the Dockerfile includes the following lines to list all available TomCats:After you’ve created a TomClaws file that contains all of your TomCasts, you can run the following to start the TomClaw service.
This will run a Docker application in the localhost Docker container.
Once the container starts, you should be prompted to specify a hostname and port.
The Tomcat service will then listen on the port specified in the Docker container and start up TomCaught on the TomCLaws file.
If you run the Tom Claws service on a different port, you will be prompted for an administrator password.
If your port is not specified, the service will default to listening on the default port of 9001.
You can use this service to start or stop Tomcat containers on your local machine using the docker-compose command.
This command starts the Tom Caught service in the container.
You must specify a port number, as the Tomclaws service only listens on a port that’s specified in Dockerfile.tomclaws.example.com.
Once you’ve specified a port, Docker will listen on port 9001 on the container and the service itself will run.
Next we’ll see how you might use this to launch Tomcat on a remote Docker server using the Docker Remote API.
The Docker Remote Plugin provides an API for connecting to a Tom Claw container.
The Docker Remote Interface is a RESTful service that lets you interact with Tom ClAW containers, so you can get information about them, set their containers’ permissions, and manage their permissions.
For this example we’ll use TomClAW to connect to TomClawk, which is a Tom Cat application that lets users view and manage the container’s status.
The remote Docker API requires that you create a Tomcatch file in the same directory as the Docker file that you want to connect.
For our example, we’ll create a file named tomcat.tomcatch.
This file should have a line that looks like this:This tells Docker to create an HTTP request for the Tomcatcher application to use to connect back to TomCat.
The command for connecting back is:The response is a JSON file that looks something like this, which you can inspect with the docker inspect command:You can then inspect the response with docker inspect tomcat response .
Here’s what the response looks like:The output looks something similar to this:As you can see, the JSON output contains the same data that you would expect to see from the TomTom service.
The key difference here is that the response doesn’t contain the container ID or port number that the Docker