k8s 如何 Failover?- 每天5分钟玩转 Docker 容器技术(127)

上一节我们有 3 个 nginx 副本分别运行在 k8s-node1 和 k8s-node2 上。现在模拟 k8s-node2 故障,关闭该节点。

等待一段时间,Kubernetes 会检查到 k8s-node2 不可用,将 k8s-n

The difference between Kubernetes and Docker lies in their scope and functionality within the container ecosystem. Docker is a platform designed for creating, running, and managing containers on a single host. It simplifies the process of packaging applications and their dependencies into isolated environments that can run consistently across different systems. Docker is particularly useful for developers who want to ensure that their applications run the same way in development, testing, and production environments[^1]. On the other hand, Kubernetes, often abbreviated as k8s, is a container orchestration system that manages containerized applications across a cluster of hosts. It provides a framework for automating deployment, scaling, and operations of application containers across clusters of hosts. Kubernetes is designed to handle the complexity of running applications at scale, offering features such as self-healing mechanisms, load balancing, and rolling updates. To illustrate how Docker can be used, here's a simple example of a Dockerfile that creates an image for a Python application: ```dockerfile # Use an official Python runtime as a parent image FROM python:3.8-slim # Set the working directory in the container WORKDIR /app # Copy the current directory contents into the container at /app COPY . /app # Install any needed packages specified in requirements.txt RUN pip install --no-cache-dir -r requirements.txt # Make port 80 available to the world outside this container EXPOSE 80 # Define environment variable ENV NAME World # Run app.py when the container launches CMD ["python", "app.py"] ``` This Dockerfile sets up a Python environment, copies the application code, installs dependencies, and runs the application. To build and run this Docker image, you would use commands like: ```bash docker build -t my-python-app . docker run -p 4000:80 my-python-app ``` Kubernetes, however, would come into play when you need to manage multiple instances of such containers across a cluster, ensuring that the desired state of the application is maintained, and automatically handling failover and scaling based on the defined policies. In summary, Docker is used for creating and running containers, whereas Kubernetes is used for orchestrating and managing those containers at scale. While Docker focuses on the container lifecycle on a single node, Kubernetes takes care of the broader picture, managing the deployment and operation of containers across multiple nodes in a cluster[^1].
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