Docker Composeネットワーク（開発者向けの仕組み）

What is Docker?

Docker is an open-source platform that uses container-based concepts to automate the deployment and scaling of applications inside lightweight, portable containers. In simple words, a Docker container puts all the application code and its dependencies together within one unit, consistent across environments—from a developer's laptop to the test server or production cloud servers.

Containers do not behave like traditional virtual machines (VMs) because they share a host system's operating system kernel. Therefore, containers are much more efficient and faster to start. Indeed, Docker containers guarantee consistent behavior across all stages of the development cycle.

In fact, Docker images are templates for descriptions of containers that hold the application environment. This set also includes toolkits for managing container life cycles. One example is Docker Compose, which you can use to orchestrate applications that consist of multiple containers. Then there's Docker Hub, a registry for sharing images.

What are Docker Compose Networks?

Docker Compose networks allow services running in a Docker Compose application to talk to each other within the same encapsulated environments. If you define more than one service in a docker-compose.yml file, Docker Compose creates a default network automatically, so that those services can communicate with each other using service names as hostnames. Essentially, it allows the user to define their own network and multiple services with the network created.

Default Bridge Network: If you define no network for your containers when you run docker-compose up, Docker automatically creates a bridge network. All containers can communicate with each other with their service name as hostname on this default driver network.

Custom Networks: With these options, users can define one or two custom networks and even more as user-defined networks. You can define custom networks within your container port and docker-compose.yml file. By assigning services to these networks, you control how containers may communicate:

• Internal networks isolate services from others.
• Multiple networks allow some services to communicate with one another while denying others such access.

Service Discovery: Every service gets a hostname equal to its name in the configuration. That is, you can refer to another service in one container by using the name of the other service. For example, in the web service, you would use db to refer to the IP of the database container.

Network Modes: You can also set network modes to use host, bridge, or none for services. The most commonly used is a bridge, which isolates container traffic.

# Create a custom bridge network
docker network create --driver bridge my_bridge_network

# Run containers and connect to the custom network
docker run -d --name container1 --network my_bridge_network busybox sleep 3600
docker run -d --name container2 --network my_bridge_network busybox sleep 3600

# Create a custom bridge network
docker network create --driver bridge my_bridge_network

# Run containers and connect to the custom network
docker run -d --name container1 --network my_bridge_network busybox sleep 3600
docker run -d --name container2 --network my_bridge_network busybox sleep 3600

# Run a container using the host network
docker run -d --network host nginx

# Run a container using the host network
docker run -d --network host nginx

# Create an overlay network for use in a Docker Swarm cluster
docker network create -d overlay my_overlay_network

# Deploy a service in the Swarm cluster
docker service create --name web --network my_overlay_network nginx

# Create an overlay network for use in a Docker Swarm cluster
docker network create -d overlay my_overlay_network

# Deploy a service in the Swarm cluster
docker service create --name web --network my_overlay_network nginx

# Run a container with no network
docker run -d --network none busybox sleep 3600

# Run a container with no network
docker run -d --network none busybox sleep 3600

# Create a Macvlan network
docker network create -d macvlan \
  --subnet=192.168.1.0/24 \
  --gateway=192.168.1.1 \
  -o parent=eth0 macvlan_network

# Run a container on the Macvlan network
docker run -d --network macvlan_network busybox sleep 3600

# Create a Macvlan network
docker network create -d macvlan \
  --subnet=192.168.1.0/24 \
  --gateway=192.168.1.1 \
  -o parent=eth0 macvlan_network

# Run a container on the Macvlan network
docker run -d --network macvlan_network busybox sleep 3600

# Create an IPvlan network
docker network create -d ipvlan \
  --subnet=192.168.1.0/24 \
  --gateway=192.168.1.1 ipvlan_network

# Run a container on the IPvlan network
docker run -d --network ipvlan_network busybox sleep 3600

# Create an IPvlan network
docker network create -d ipvlan \
  --subnet=192.168.1.0/24 \
  --gateway=192.168.1.1 ipvlan_network

# Run a container on the IPvlan network
docker run -d --network ipvlan_network busybox sleep 3600

# Pull IronSecureDoc Docker image
docker pull ironsoftwareofficial/ironsecuredoc

# Pull IronSecureDoc Docker image
docker pull ironsoftwareofficial/ironsecuredoc

# Run a container with network isolation and environment variables
docker container run --rm -p 8080:8080 \
  -e IronSecureDoc_LicenseKey=<IRONSECUREDOC_LICENSE_KEY> \
  -e ENVIRONMENT=Development \
  -e HTTP_PORTS=8080 \
  ironsoftwareofficial/ironsecuredoc:latest

# Run a container with network isolation and environment variables
docker container run --rm -p 8080:8080 \
  -e IronSecureDoc_LicenseKey=<IRONSECUREDOC_LICENSE_KEY> \
  -e ENVIRONMENT=Development \
  -e HTTP_PORTS=8080 \
  ironsoftwareofficial/ironsecuredoc:latest

# POST a document for encryption using cURL
curl -X 'POST' \
  'http://localhost:8080/v1/document-services/pdfs/encrypt?user_password=demo' \
  -H 'accept: */*' \
  -H 'Content-Type: multipart/form-data' \
  -F 'pdf_file=@test.pdf;type=application/pdf'

# POST a document for encryption using cURL
curl -X 'POST' \
  'http://localhost:8080/v1/document-services/pdfs/encrypt?user_password=demo' \
  -H 'accept: */*' \
  -H 'Content-Type: multipart/form-data' \
  -F 'pdf_file=@test.pdf;type=application/pdf'

Conclusion

Docker networking is crucial in controlling application interactions and their communication with other applications and the rest of the world through different drivers and configurations for diverse application needs. The default bridge network configuration allows basic isolation as services can be exposed to host systems through port mapping, as exemplified by the IronSecureDoc application. It facilitates easier management and configuration of containerized applications, enhancing the operational flexibility and scalability of the application.

IronSecureDoc, an advanced document processing tool, leverages Docker's capabilities in terms of containerization, allowing rapid and reliable application deployment. This ensures support for multiple environments while seamlessly integrating Docker networking with IronSecureDoc, making the integration of applications easy, accessible, and manageable.

Consequently, it streamlines workflows, improves efficiency, and enhances operations, especially when processing documents. This ultimately enriches both development and deployment experiences, making it a valuable solution for modern software applications. For more information on IronSecureDoc licensing, please follow this page. To learn more about many of the product offerings from Iron Software, follow this link.