docker exec -it mongodb1 mongosh

rs.initiate({ _id: "rs0", members: [ { _id: 0, host: "mongodb1:27017" }, { _id: 1, host: "mongodb2:27017" } ] });

rs.status();

use('testdb')

db.customers.insertOne({ name: "Jane Doe2", email: "jane.doe@example.com" })

db.customers.find().pretty()