1. Deployment Mechanism: Docker Machine is a tool that helps in creating and managing multiple Docker-host virtual machines, making it easier to install Docker Engine on them. On the other hand, Rancher is a powerful container management platform that simplifies the deployment, management, and scaling of containers across different environments.
2. Cluster Orchestration: Docker Machine focuses on single-host setups and does not provide built-in cluster orchestration capabilities, requiring third-party tools for managing clusters. In contrast, Rancher offers robust cluster orchestration features out of the box, allowing users to easily create and manage container clusters across various infrastructure environments.
3. Monitoring and Logging: Docker Machine does not natively include monitoring and logging capabilities, requiring additional tools to be integrated for comprehensive monitoring and logging. Rancher, on the other hand, provides built-in monitoring and logging features, making it easier for users to monitor the health and performance of their containerized applications.
4. Networking Features: Docker Machine offers basic networking features to connect containers running on individual hosts but lacks advanced networking functionalities for managing complex network environments. Rancher comes with advanced networking capabilities, including support for different networking plugins and overlay networks, facilitating seamless communication between containers across clusters.
5. User Interface: Docker Machine primarily relies on command-line interface (CLI) for interacting with and managing Docker hosts, which can be challenging for users who prefer graphical user interfaces. In contrast, Rancher provides an intuitive web-based user interface that simplifies container management tasks and offers a visual representation of container clusters, making it more user-friendly.
6. Scalability and Extensibility: Docker Machine is suitable for small to medium-scale deployments and may face limitations in managing large-scale container infrastructures seamlessly. Rancher, on the other hand, is designed to scale efficiently and is highly extensible, allowing users to integrate with various external tools and services to enhance their container management workflows.

In Summary, the key differences between Docker Machine and Rancher lie in their deployment mechanisms, cluster orchestration capabilities, monitoring and logging features, networking functionalities, user interfaces, and scalability/extensibility.