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The official documentation, “Migrating data from MongoDB 3 to 5”, wants to dump the MongoDB databases in 3.6 and then restore this data into the newly deployed MongoDB 5.

One issue with this process is that we can’t run the two MongoDB versions in parallel on Kubernetes because the provided helm charts and container for MongoDB 3.6 stop running after Kubernetes 1.21. On the other side, the helm chart providing MongoDB 5 can’t be installed on those old Kubernetes versions. So the process to update is:

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