How to access docker services

Docker is a popular containerization platform that helps users easily build, publish, and run applications. Docker runs on a variety of operating systems and can be used with almost any programming language. If you are a Docker user, you probably already know how to run applications in a local Docker container. However, in a real production environment, you need to understand how to provide services externally over the network. This article will explain how to access Docker's services and show you how to use port mapping and networking in Docker.

1. Using Port Mapping

When you run a service in Docker, by default the service is only accessible locally and not from other computers. In order for a service to be accessible, you need to expose the service to the public network via port mapping. Port mapping is a technique for mapping internal Docker ports to external computers. Here are some steps to do this:

Step 1: Run the service in Docker

First, you need to run your service in Docker locally. For example, if you are running a web application, you will need to use the appropriate Docker commands to run the application in a container.

Step 2: Find the IP address of the Docker container

Next, you need to find the IP address of the Docker container. You can run the following command to get the IP address of the container:

docker inspect <container_name> | grep "IPAddress"

Note: where is the name of the container you want to query. Typically, the name of the container is the same as the name of the application.

Step 3: Map the container port to the host port

Next, you need to map the container port to the host port. For example, if your application runs on port 80 in the container, you need to map that port to port 8080 on the host. You can use the following command to perform this operation:

docker run -p 8080:80 -d <image_name>

Note: where -p refers to mapping the port to host port 8080, -d refers to running the container in daemon mode, is The name of the Docker image running the application.

Step 4: Access the container by hostname

Finally, you can access the container using the hostname or IP address. If you have mapped the container's port to the host's port 8080, you can access the service in the following way:

http://<hostname>:8080

Note: where is the name or IP address of the computer you want to access.

2. Using Docker Network

In addition to using port mapping, Docker also supports using Docker Network to access services in containers. Docker Network is a network of containers that allows containers to communicate with each other and makes it easier for containers to communicate with external computers. Here are some steps to do this:

Step 1: Create a Docker network

First, you need to create a Docker network. You can use the following command to create a network:

docker network create <network_name>

Note: where is the name of the Docker network you want to create.

Step 2: Start the container and use Docker networking

Next, you need to start the container using Docker networking. You can use the following command to start the container and connect to the network you created:

docker run --name <container_name> --network <network_name> -d <image_name>

Note: --name refers to specifying a name for the container, --network refers to specifying the network for the container, is the name of the Docker network you want to use, is the name of the Docker image that runs the application.

Step 3: Access the service via container name

Finally, you can access the service using the container name. If you have connected the container to the Docker network, you can access the service using the container name. For example, if you want to access a container with the container name my_app, you can access the service using:

http://my_app

Note: You do not need to specify a port number because Docker networking already exposes the service to the local network.

Conclusion

With the above method, you can access the service in Docker. Port mapping helps you expose services to the public network, and Docker networking helps you communicate with other services in containers. Choosing the appropriate method depends on your specific needs and circumstances. When using Docker, make sure to follow security best practices and protect your containers and services from attacks.

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