How to deploy tomcat with docker

Docker is a lightweight containerization technology designed to enable applications to have the same behavior and performance in different environments. Tomcat is a popular Java web application server that is widely used to develop and run Java web applications. This article will introduce how Docker deploys Tomcat.

First, we need to install Docker and run the Docker engine. Relevant installation guides can be found on the Docker official website.

Next, we need to download the Tomcat image. Docker Hub is a platform for centralized management of Docker images. We can search and download Tomcat images here. Alternatively, use the following command in the command line terminal to download the Tomcat image:

docker pull tomcat

This will download the latest Tomcat image. If you require a specific version of Tomcat, specify the version tag. For example, to download Tomcat 9, you can use the following command:

docker pull tomcat:9

After the download is complete, we can run the Tomcat container. Before running the container, we need to copy the Tomcat application into the container. To do this, create a Tomcat application directory locally and copy the application files to it. Assuming that the directory of the Tomcat application is /path/to/tomcat_app, you can use the following command to run the Tomcat container:

docker run -d --name my-tomcat -p 8080:8080 -v /path/to/tomcat_app:/usr/local/tomcat/webapps tomcat

This will start a file named my-tomcat of the new container and map the container's 8080 port to the host's 8080 port. The -v option mounts the Tomcat application directory /path/to/tomcat_app into the container's /usr/local/tomcat/webapps directory. This way, the Tomcat server inside the container can access the application files.

Next, we can test whether the Tomcat container is working properly by visiting http://localhost:8080. If everything is fine, Tomcat will display the default welcome page.

If you need to stop or delete the Tomcat container, you can use the following command:

Stop the container:

docker stop my-tomcat

Delete the container:

docker rm my-tomcat

To use in a different environment To deploy Tomcat, simply copy the Tomcat application files to the appropriate directory and run the same docker run command. Deploying Tomcat using Docker will greatly simplify the application deployment and maintenance process.

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