pretendo-docker/scripts/run-in-container/mongodb-init.js

// Initiate the replica set. We need to set up the members like this because, by
// default, the first member uses the host 127.0.0.1, which causes the other
// servers to attempt to connect to their own loopback addresses.
rs.initiate({
    _id: "rs",
    members: [
        {
            _id: 0,
            host: "mongodb:27017",
        },
    ],
});

// Wait for the replica set to initiate
while (rs.status().hasOwnProperty("myState") && rs.status().myState != 1) {
    console.log("Waiting for replica set to initiate...");
    console.log(rs.status());
    sleep(1000);
}

// Log replica set configuration
console.log("Replica set configuration:");
console.log(rs.conf());
console.log("Replica set status:");
console.log(rs.status());