What are the differences between enabling SSH access to a pod and a container in Kubernetes?

[dmitrii_fediuk]

Сomparing enabling SSH access to a pod and a container in Kubernetes is meaningless.

1. Understanding Pods and Containers
   • A pod is the smallest deployable unit in Kubernetes, representing one or more containers that share the same network and storage.
   • All processes and applications run inside containers within a pod.
2. SSH Access in Kubernetes
   • SSH access is established to a container because it contains the file system and runtime environment.
   • The pod itself does not have an environment separate from its containers to connect to via SSH.
3. Inevitability of Targeting Containers
   • When using commands like kubectl exec, you are inherently accessing a container within a pod.
   • If a pod has multiple containers, you must specify which container to target using -c <container_name>.
4. Meaninglessness of the Comparison
   • Enabling SSH access to a pod without specifying a container is not feasible because all operations occur within containers.
   • The pod serves as a logical grouping and does not host processes independently of its containers.
5. Conclusion
   • Comparing enabling SSH access to a pod versus a container is meaningless.
   • SSH access is always to a container inside a pod, and the pod cannot be accessed separately from its containers.

[dmitrii_fediuk]

• What are the differences between enabling SSH access to a pod and a service in Kubernetes?
• Is it necessary to open port 22 at the service's level in Kubernetes for SSH access to a container via ssh?
• Is it necessary to open port 22 at the container's level in Kubernetes for SSH access to a container via ssh?