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Docker 认证(开发者工具如何工作)

What is Docker?

Docker is a free, open-source containerization platform that makes it easier to develop, deploy, and maintain applications. It provides a lightweight container that includes an application and all its dependencies, allowing it to run in various environments—from the developer's personal computer to a production server. These containers are more efficient and faster because they share the operating system kernel of the host system, unlike traditional virtual machines.

Docker Certification (How it Works for Developers): Figure 1

Docker is not just about the engine; it provides a model to create, manage, and share containers. A key component of this model is Docker images, shared via Docker Hub—a special type of repository for storing and distributing container images. Docker is prominent in cloud-based development workflows and DevOps for its scalability, portability, and efficiency. Docker is available in two versions: Docker Community Edition and Docker Enterprise Edition.

What is a Docker certificate?

A Docker certificate is a digital document used to establish secure communications between a Docker client and a Docker server, such as a Docker daemon or a Docker registry, using HTTPS. It is a crucial component of Docker's TLS configuration, ensuring secure client-server interactions. This is particularly useful when deploying Docker in production or distributed environments.

Features of Docker Certificates

  • TLS/SSL Authentication: TLS/SSL certificates authenticate clients and servers to confirm their legitimacy.
  • Encryption: Certificates encrypt data transmission between client and server, ensuring data privacy.
  • Mutual Authentication: Mutual TLS uses certificates for bi-directional authentication between client and server, ensuring security by requiring verification of both parties before data exchange.

Types of Certificates in Docker

  • Server Certificate: Authenticates the Docker daemon to clients. It is installed on the server hosting Docker.
  • Client Certificate: Granted to clients for authentication with a server, signed by a trusted CA.
  • CA Certificate: Used by both parties, issued to sign server or client certificates to build trust.

Using a Custom Certificate Authority (CA)

To trust a custom CA, configure Docker to recognize it by storing the CA certificate in /etc/docker/certs.d/<your-registry>/ca.crt on your Docker host.

Using Docker with TLS

The Docker daemon can be secured with TLS by generating server and client certificates and configuring Docker to use them for communication.

Generate Certificates

To generate the necessary certificates using OpenSSL:

# Generate CA private key
openssl genrsa -aes256 -out ca-key.pem 4096

# Generate CA certificate
openssl req -new -x509 -days 365 -key ca-key.pem -sha256 -out ca.pem
# Generate CA private key
openssl genrsa -aes256 -out ca-key.pem 4096

# Generate CA certificate
openssl req -new -x509 -days 365 -key ca-key.pem -sha256 -out ca.pem
SHELL

Docker Certification (How it Works for Developers): Figure 2

Generate client and server keys and certificates:

# Generate server private key
openssl genrsa -out server-key.pem 4096

# Create server certificate signing request (CSR)
openssl req -subj "/CN=your-server" -sha256 -new -key server-key.pem -out server.csr

# Sign the server certificate using the CA
openssl x509 -req -days 365 -sha256 -in server.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out server-cert.pem
# Generate server private key
openssl genrsa -out server-key.pem 4096

# Create server certificate signing request (CSR)
openssl req -subj "/CN=your-server" -sha256 -new -key server-key.pem -out server.csr

# Sign the server certificate using the CA
openssl x509 -req -days 365 -sha256 -in server.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out server-cert.pem
SHELL

Finally, configure Docker to use these certificates by placing them in the appropriate directories and updating the Docker daemon configuration.

Configure Docker Daemon

Modify the Docker daemon configuration to use the generated certificates:

{
  "tls": true,
  "tlsverify": true,
  "tlscacert": "/etc/docker/ca.pem",
  "tlscert": "/etc/docker/server-cert.pem",
  "tlskey": "/etc/docker/server-key.pem",
  "hosts": ["tcp://0.0.0.0:2376", "unix:///var/run/docker.sock"]
}

Restart the Docker daemon to apply these settings.

Docker Certification Exam

The Docker Certified Associate (DCA) is an esteemed certification validating expertise in Docker capabilities. It entails approximately 55 multiple-choice and multiple-select questions in a 90-minute online proctored exam, covering domains such as orchestration, image management, installation and configuration, networking, security, and storage. Though there are no strict prerequisites, having at least six months of practical Docker experience is recommended. The certification is valid for two years. Preparation includes studying Docker documentation, practicing CLI commands, and using mock exams, enhancing career prospects in DevOps and container orchestration. Learn more about Docker training here.

What is IronSecureDoc?

IronSecureDoc is a product by Iron Software designed to secure documents, notably PDFs, through robust encryption and user permissions. Organizations benefit from advanced AES-256 encryption protocols, restricting access to sensitive information. Custom permissions govern printing, editing, or copying, thus enforcing authorized access. It supports password protection and digital signatures, ensuring document integrity and security, with watermarking options.

Docker Certification (How it Works for Developers): Figure 3 - IronSecureDoc: The PDF Security and Compliance Server

IronSecureDoc is developer-friendly, adaptable to applications running through Docker or other environments, crucial in industries like health, finance, and legal, where document confidentiality is paramount.

How Certificates Enhance IronSecureDoc Security

  • Authentication: Allows user or system authentication on secured documents, granting only authorized access, vital for compliance, especially in regulated sectors like finance and healthcare.
  • Encryption: Utilizes public key encryption to ensure only individuals with corresponding private keys can access files, preventing unauthorized access.
  • Digital Signatures: Supports digital signing, confirming document origin and integrity, thereby building trust and fulfilling legal standards for digital transactions.

Install and Running IronSecureDoc

To pull the IronSecureDoc Docker image from the repository, execute:

docker pull ironsoftwareofficial/ironsecuredoc
docker pull ironsoftwareofficial/ironsecuredoc
SHELL

Docker Certification (How it Works for Developers): Figure 4

Use the below command to run IronSecureDoc in a Docker container:

docker container run --rm -p 8080:8080 -e IronSecureDoc_LicenseKey=<IRONSECUREDOC_LICENSE_KEY> -e ENVIRONMENT=Development -e HTTP_PORTS=8080 ironsoftwareofficial/ironsecuredoc:latest
docker container run --rm -p 8080:8080 -e IronSecureDoc_LicenseKey=<IRONSECUREDOC_LICENSE_KEY> -e ENVIRONMENT=Development -e HTTP_PORTS=8080 ironsoftwareofficial/ironsecuredoc:latest
SHELL

This command creates a running instance of IronSecureDoc.

Using IronSecureDoc

IronSecureDoc's REST API allows document redaction, certification, and encryption upon installation and launch in Docker. See documentation for more details.

Docker Certification (How it Works for Developers): Figure 5

To encrypt a document via IronSecureDoc API, use:

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'
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'
SHELL

This command sends the document to IronSecureDoc for encryption.

Conclusion

Docker certificates and IronSecureDoc offer a secure framework for managing documents in containerized environments. Docker certificates ensure encrypted and authenticated communication between Docker clients and servers, supporting the secure deployment and management of container-hosted applications like IronSecureDoc. This framework limits access to trusted entities, preventing unauthorized actions within server environments.

IronSecureDoc enhances document-specific security through encryption, access control, and digital signatures, protecting both infrastructure and sensitive data. For licensing information about IronSecureDoc, visit this page. For more about Iron Software's offerings, click here.

常见问题解答

如何确保 Docker 客户端和服务器之间的通信安全?

您可以通过使用 Docker 证书来确保 Docker 客户端和服务器之间的通信安全,这些证书使用 TLS/SSL 身份验证来加密数据传输并验证客户端和服务器的合法性。

什么是 Docker 证书以及它如何工作?

Docker 证书是一种数字证书,用于通过 HTTPS 在 Docker 客户端和服务器之间建立安全通信。它确保相互认证和加密,保障生产环境中的数据交换。

开发人员如何在容器化环境中增强文档安全性?

开发人员可以使用 IronSecureDoc 在容器化环境中增强文档安全性,该软件提供 AES-256 加密、密码保护和数字签名。它与 Docker 无缝集成,允许安全的文档管理。

什么是 Docker Certified Associate 考试?

Docker Certified Associate(DCA)考试验证您在 Docker 方面的专业知识,涵盖编排、镜像管理和安全等主题。考试包含大约 55 个问题,有效期为两年。

我如何使用 Docker 实施文档安全?

您可以通过从仓库中拉取 IronSecureDoc Docker 镜像并在 Docker 容器中运行它来实现文档安全。这使您能够利用诸如加密和身份验证之类的高级安全功能。

证书在文档安全中起到什么作用?

证书在文档安全中起着至关重要的作用,能够通过使用公钥加密防止未经授权的访问,支持数字签名以确保文档完整性,并启用身份验证和访问控制。

Docker 和 IronSecureDoc 如何协同工作以确保数据安全?

Docker 和 IronSecureDoc 可以通过使用 Docker 证书确保安全通信,利用 IronSecureDoc 的功能来加密和管理容器化应用程序中的文档,从而共同确保数据安全。

在文档安全中使用 Docker 的好处是什么?

在文档安全中使用 Docker 允许通过轻量级容器高效部署和管理应用程序,同时 Docker 证书确保安全的客户端-服务器交互,增强整体安全性。

Curtis Chau
技术作家

Curtis Chau 拥有卡尔顿大学的计算机科学学士学位,专注于前端开发,精通 Node.js、TypeScript、JavaScript 和 React。他热衷于打造直观且美观的用户界面,喜欢使用现代框架并创建结构良好、视觉吸引力强的手册。

除了开发之外,Curtis 对物联网 (IoT) 有浓厚的兴趣,探索将硬件和软件集成的新方法。在空闲时间,他喜欢玩游戏和构建 Discord 机器人,将他对技术的热爱与创造力相结合。