How to start tomcat under docker

Docker has become the most popular containerization platform. It provides a fast, reliable, and portable way to build, deploy, and run applications. Tomcat is an open source Servlet container under the Apache Foundation and the most important part of Java EE applications. How to start Tomcat under Docker is a question that Java developers are most concerned about. This article will teach you how to start Tomcat in a Docker container.

Step one: Create a Dockerfile
In Docker, we use the Dockerfile file to define the content and operation mode of the Docker image. The following is the simplest Dockerfile file content:

FROM tomcat:latest

This command downloads the image mainly based on the Tomcat container from the Docker image warehouse. Docker will cache the image on your local machine for future use.

Step 2: Build the Docker image

After creating the Dockerfile, we need to use the following command in the current directory to build the Docker image:

docker build -t my-tomcat .

This command uses The -t flag specifies the name of the built Docker image (here, my-tomcat), and a dot is added at the end of the file path to indicate that the current directory is the location of the Dockerfile file. Building the Docker image takes some time, depending on your network speed and the size of your Tomcat version.

Step 3: Start the Tomcat container

After completing the Docker image construction, we can use the following command to start the Tomcat container:

docker run -p 8080:8080 my-tomcat

This command uses the -p flag Create a mapping between the local port number 8080 and the port number 8080 inside the Tomcat container. We can enter http://localhost:8080 in the browser to access the Tomcat server.

Step 4: Customize the Tomcat management console account and password

By default, the default administrator account of the Tomcat container is tomcat. You can use the following command to customize the account and password to protect your management console:

docker run -p 8080:8080 -e TOMCAT_USERNAME=<your_username> -e TOMCAT_PASSWORD=<your_password> my-tomcat

This command uses the -e flag to specify environment variables. The TOMCAT_USERNAME and TOMCAT_PASSWORD variables are used to define customized account names and passwords. The account name and password will be used for authentication within the Docker container.

Step 5: Deploy the application to the Tomcat container

Now we assume that your application name is my-app.war and place the file in the local folder /path /to/myapp. We can deploy the application into the Tomcat container using the following command:

docker run -p 8080:8080 -v /path/to/myapp:/usr/local/tomcat/webapps my-tomcat

This command uses the -v flag to define a local file volume, where /path/to/myapp is the local location where your application is located Path, /usr/local/tomcat/webapps is the path where your Tomcat container web application is stored.

Now, we have successfully started Tomcat in the Docker container and deployed the application into the Tomcat container. If you wish to stop the Tomcat container, use the Ctrl C shortcut to close the terminal window.

Conclusion

Docker images provide Java developers with a more flexible, portable, and efficient development and deployment environment. Running Java applications in a Tomcat container can help us develop and test quickly and conveniently. When writing or testing Java applications, this article introduces some simple steps that can make it easier for Java developers to develop and test under Docker containers. Start Tomcat.

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