[RFE] Nested pods

[dapiced]

Feature request description

Hi, is it possible to have a master pod that would contain several slave pods (with their containers) ? i don't have a specific case but i think it will be a good idea to finetune the nested pods concept...

Tell me if this is on you plan or maybe I'm wrong.... just let know your thought about these nested pods concept

thanks

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[baude]

thanks for your request. could you elaborate on why this would be needed and helpful?

[dapiced]

HI, here is what i mean.

Hierarchical Organization: Allows for a more organized structuring of containers, facilitating the management and understanding of relationships between services.
Increased Isolation: Each level of pods could offer an additional layer of isolation, enhancing security and stability.
Resource Management: A hierarchy of pods could enable finer resource allocation, controlling CPU and memory limits at different levels.
Modular Deployment: Facilitates the deployment of service subsets, allowing for updates or restarts of specific parts of the application without affecting the whole.
Scalability: Allows for independent scaling of service subsets, optimizing resource utilization.

Here are some concrete examples of nested pods

Example 1: Web Application with Support Services
Main Pod: Web Application
Pod 1: Web Server (Nginx)
Pod 1.1: Application Containers (Node.js)
Pod 1.2: Session Management Containers (Redis)
Pod 2: Database
Pod 2.1: Database Server (PostgreSQL)
Pod 2.1.1: Backup Containers (Backup Service)
Pod 2.1.2: Monitoring Containers (Prometheus)

Example 2: Microservices System
Main Pod: Microservices System
Pod 1: Authentication Service
Pod 1.1: API Containers (Spring Boot)
Pod 1.2: Token Management Containers (JWT Service)
Pod 2: Payment Service
Pod 2.1: Payment Processing Containers (Python)
Pod 2.2: Transaction Validation Containers (Go)

Example 3: Development Environment
Main Pod: Development Environment
Pod 1: Online IDE (Theia)
Pod 1.1: IDE Containers
Pod 1.2: Compilation Containers (GCC)
Pod 2: Development Services
Pod 2.1: Test Servers (JUnit)
Pod 2.2: Deployment Servers (Ansible)

These examples illustrate how a hierarchical structure of pods could be used to organize and manage containers more effectively.

[Luap99]

I don't think it would make sense, this seems quite complex as you now have pod dependencies and the cgroup management does not look straight forward either.

Also I am not aware of a nested pod design anywhere. At the very least this would be incompatible with k8s yaml.

I feel like all of this could be handled via external scripts already so I would be against this.