What is the use of a pause image in Kubernetes?
The pause container is a container which holds the network namespace for the pod. Kubernetes creates pause containers to acquire the respective pod’s IP address and set up the network namespace for all other containers that join that pod.
references:
1, https://www.ianlewis.org/en/almighty-pause-container
2, https://groups.google.com/forum/#!topic/kubernetes-users/jVjv0QK4b_o