How to docker for war package

War package is a packaging format for Web applications, which usually contains static files, Java classes and other resource files of Web applications. War packages can be deployed through Docker containers, allowing us to manage and maintain web applications more efficiently. This article will use examples to introduce how to deploy the War package into a Docker container.

1. Install Docker

Before we begin, we need to install Docker first. For Linux systems, you can install it with the following command:

sudo apt-get install docker-ce

After the installation is completed, we need to start the Docker service:

sudo systemctl start docker

In order to use the Docker command conveniently, we can add the current user to Docker Group:

sudo usermod -aG docker $USER

2. Write Dockerfile

Dockerfile is the build file of the Docker image and is used to describe how to build the Docker image. We can build a Docker image containing a web application through Dockerfile.

The following is a simple Dockerfile example:

FROM tomcat:9.0.44-jdk11-openjdk

COPY myapp.war /usr/local/tomcat/webapps/

In the above Dockerfile, the base image is first specified as tomcat:9.0.44-jdk11-openjdk. Then use the COPY command to copy our War package to Tomcat's webapps directory.

3. Build the Docker image

After having the Dockerfile, we need to use the docker build command to build the Docker image:

docker build -t myapp:v1 .

Among them, the -t parameter is used for the image Specify a name and version number. Here we name the image myapp:v1. The final "." indicates the current directory, which is the directory where the Dockerfile is located.

Docker will read the Dockerfile and build the image according to the description. After the build is completed, we can use the docker images command to view the list of all images to confirm whether our application image was built successfully.

docker images

4. Run the Docker container

After we have the image, we can start a Docker container through the docker run command:

docker run -d -p 8080:8080 myapp:v1

Among them, the -d parameter indicates the container Running in the background, the -p parameter is used to specify that the port inside the container is mapped to the port on the host. Here we map Tomcat's default port 8080 to the host's port 8080. The final myapp:v1 indicates the name and version of the Docker image we want to run.

After the operation is completed, we can visit http://localhost:8080/myapp through the browser to check whether the web application is running normally.

5. Update Deployment

When updating the web application, we can directly replace the corresponding War package. If we have a new myapp_new.war, during the deployment process, we only need to copy it to Tomcat's webapps directory and restart the Docker container.

docker cp myapp_new.war <container_id>:/usr/local/tomcat/webapps/
docker restart <container_id>

6. Summary

Through Docker’s deployment method, we can deploy and manage web applications more simply and conveniently. This article introduces how to deploy the War package into a Docker container and provides a simple example for your reference. Of course, the specific deployment method needs to be adjusted and optimized according to the actual situation.

The above is the detailed content of How to docker for war package. For more information, please follow other related articles on the PHP Chinese website!