Build applications using Golang's web framework Revel framework and Docker

With the continuous development of Internet technology, more and more enterprises and teams adopt microservice architecture to develop and deploy applications. Among them, using Docker containers for application deployment and management is an increasingly popular way. For developers who use Golang language to develop web applications, the Revel framework is a simple, easy-to-use, efficient and stable web framework that can be easily used in conjunction with Docker containers.

This article will introduce the process of building a web application using the Revel framework and Docker container. Specifically, it will start with installing and configuring the environment, step by step how to create Revel applications and Docker images, and finally demonstrate how to use Docker containers to run and deploy applications.

1. Installation and configuration environment

First, install and configure the Golang and Docker environments. For the installation and configuration of Golang, please refer to the official documentation. To download and install Docker, please refer to https://docs.docker.com/engine/install/. In addition, you can use Docker Desktop to simplify the installation and configuration of Docker, which supports Windows, macOS and Linux operating systems. For details, please refer to https://www.docker.com/products/docker-desktop.

2. Creating a Revel application

Next, you need to create a new Revel application. You can use the Revel CLI tool to quickly create an application. The specific commands are as follows:

$ go get github.com/revel/revel
$ go get github.com/revel/cmd/revel
$ revel new myapp

Among them, the first line of command will get the main code of the Revel framework, and the second line of command will get the Revel CLI tool. The third line of command will create a new Revel application named myapp using the Revel CLI tool. When creating an application, you can choose from different application templates such as RESTful API, Web Application, WebSocket Server, etc.

After creating the application, you can see the structure of the application in the myapp directory. The main files include the app directory (containing the main logic of the application), the conf directory (containing the application's configuration files), and the public directory (containing resources such as static files).

3. Build a Docker image

After completing the creation of the Revel application, you need to package the application into a Docker image to facilitate deployment and running in different environments.

First, you need to create a file named Dockerfile in the myapp directory and define the build instructions of the Docker image in it. The following is a simple Dockerfile example:

FROM golang:alpine
MAINTAINER xxx@xxx.com

RUN apk add --no-cache git

WORKDIR /go/src/app

COPY . .

RUN go get -d -v ./...
RUN go install -v ./...

CMD ["app"]

The principle of the above Dockerfile file is to download the alpine version of Golang, and then copy all the files in the myapp program directory to the named app directory. Next, the dependent libraries will be downloaded and installed, and the application will be compiled and installed in the /bin directory. Finally, use the CMD command to run the myapp application.

Next, use the following command to build the Docker image:

$ docker build -t myapp .

Among them, "-t" specifies the label of the Docker image, here it is set to "myapp", which means building the myapp application A Docker image. Note that since this command uses the Dockerfile in the current directory to build the image, you need to run this command in the myapp directory.

4. Run and deploy the application

After completing the construction of the Docker image, you need to run and deploy the application.

First, you can use the following command to run the Docker container:

$ docker run -p 9000:9000 myapp

Among them, "-p" specifies the mapping between the container port and the host port. Here, the container port 9000 is mapped to the host port 9000. . After using the above command, you should be able to access the application by accessing http://localhost:9000 in the browser.

To simplify deploying and managing applications, you can use Docker Compose to manage multiple containers. First, you need to create a file named docker-compose.yml and define relevant service information in it. The following is a simple example:

version: '3'
services:
  myapp:
    build: .
    container_name: myapp
    ports:
      - "9000:9000"

In the above example, the myapp service contains Docker image building instructions, Docker container name and port mapping information. You can use the following commands to start and stop the application:

$ docker-compose up
$ docker-compose down

The Docker-compose up command will start all defined services, while the Docker-compose down command will stop all services and delete corresponding containers, networks and other resources.

Summary

This article introduces the process of building an application using Golang's Web framework Revel framework and Docker. Specifically, you first need to install and configure Golang and Docker environments, then use the Revel CLI tool to create a new Revel application, secondly package the application into a Docker image, and finally use Docker containers to run and deploy the application. Through the above steps, Revel applications can be easily deployed and run, and combined with Docker containers, applications can be managed and deployed more efficiently.

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