Description:
- A running user space around codes and its dependencies
- Machine Image
- Subject to Cold Start
- Make new vm instance is boot whenever in use
- Based on Linux technologies
- Foundation of the Linux process.
- Each Linux process has its own virtual memory address space, separate from all others, and Linux processes can be rapidly created and destroyed.
- Linux namespaces.
- Containers use Linux namespaces to control what an application can see, such as process ID numbers, directory trees, IP addresses, etc.
- It’s important to note that Linux namespaces are not the same thing as Kubernetes namespaces, which you’ll learn more about later in this course.
- Linux cgroups.
- Linux cgroups control what an application can use, such as its maximum consumption of CPU time, memory, I/O bandwidth, and other resources.
- Union file systems :
- to bundle everything needed into a neat package.
- This requires combining applications and their dependencies into a set of clean, minimal layers.
K8s container state:
| State | Desc |
|---|
| Waiting | |
| Running | |
| Terminated | |