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Nor is it supposed to. An emptyDir is shared between multiple containers in one pod, not between multiple pods in a deployment (which may be scheduled to different nodes).

Any idea how to share between pods in a deployment without Longhorn or NFS?

I mean there are other similar things, but you cannot share storage without.. shared.. storage A hostPath will work if you have exactly one node (or are ok with one set of data per node shared with pods on a given node, but separate from other nodes)