As a professional operation and maintenance engineer, I must know Docker and K8s. They are also skills and knowledge that we often use in our follow-up work. Therefore, when participating in interviews, we will always be asked: What is the difference between docker and k8s? Below we Let's introduce it in detail through this article.
Docker and K8s are two different technologies. Docker is a containerization technology, while K8s is a container orchestration technology. The main difference lies in its usage scenarios and application scope.
Docker is an open source containerization platform that packages an application and its dependencies into a portable container so that the application can run anywhere. Docker containers can run on a computer and be moved between different computers, enabling fast and reliable application deployment. The Docker container itself is independent and can run without any special environment settings, and each Docker container can have its own network port and IP address.
In contrast, K8S is a container orchestration platform capable of managing multiple Docker containers and combining them into a whole. K8s provides a way to dynamically manage Docker containers, which can balance them to different nodes in the cluster, and automatically deploy, upgrade and scale applications.
The development and deployment of Docker containers is very simple, but for multi-container applications, it is necessary to manually write start and stop scripts and realize the interconnection between containers. K8s provides more advanced deployment, upgrade and scaling capabilities, and can automate a large number of operations, thereby improving productivity and efficiency.
Advantages of Docker and Kubernetes
Advantages of Docker:
① Isolation: Docker containers are isolated from each other, and each container runs its own process, file system, and network interface, thus ensuring the independence and security of the application container.
② Portability: Docker containers can run anywhere without modification, thus enabling rapid distribution, deployment and porting of applications in different environments.
③ Simplicity: The Docker container only contains the required components and software packages, unlike a virtual machine that needs to run the entire operating system, so it has smaller storage and memory overhead.
④Repeatability: The process of building and deploying Docker containers can be automated, thus ensuring the repeatability and consistency of applications.
Advantages of Kubernetes:
①Scalability: K8S can quickly scale applications to cope with different traffic and load changes, improving production efficiency and flexibility.
② Robustness: K8S can automatically deploy, expand, update and roll back containers, so that online applications have higher availability and robustness.
③Adaptiveness: K8S can automatically deploy, migrate, and delete containers according to resource requirements, thereby realizing the adaptiveness of applications and avoiding resource waste and performance bottlenecks.
④Observability: K8S provides rich monitoring and logging functions, which can monitor and debug applications and containers in a fine-grained manner.