Error

Error Code: 76

MongoDB Error 76: No Replication Enabled

📦 MongoDB

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Description

MongoDB Error 76, 'No Replication Enabled', signifies that the database instance is not configured as part of a replica set or that the configured replica set has not been properly initialized. This error typically arises when attempting to execute commands or operations that require replication features on a standalone server or an uninitialized replica set member.

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Error Message

No Replication Enabled

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Known Causes

3 known causes

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Standalone Instance

The MongoDB server is running as a standalone instance and has not been configured to be part of a replica set.

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Uninitialized Replica Set

The MongoDB instance is configured with a replica set name, but the replica set itself has not been initialized using the `rs.initiate()` command.

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Missing Configuration

The `mongod` process was started without the necessary `replSet` configuration parameter, preventing it from forming or joining a replica set.

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Solutions

3 solutions available

1. Configure a Replica Set medium

Set up a MongoDB replica set to enable replication and address the error.

Ensure you have at least two MongoDB instances running (or plan to start them). These will form your replica set.

Stop all running MongoDB instances that you intend to include in the replica set.

Modify the configuration file (e.g., `mongod.conf`) for each MongoDB instance to include replica set configuration. The key parameters are `replication.replSetName` and `net.bindIp` (ensure it's accessible to other members).

replication:
  replSetName: "myReplicaSet"

net:
  port: 27017
  bindIp: 0.0.0.0 # Or specific IPs accessible by other members

Start each MongoDB instance with the updated configuration. Use the `--replSet` option if not using a config file, but the config file is recommended for persistence.

mongod --config /path/to/your/mongod.conf

Connect to one of the MongoDB instances using the mongo shell.

mongo

Initialize the replica set. Replace `member_hostname_or_ip:port` with the actual connection strings for each member of your replica set.

rs.initiate( {
   _id: "myReplicaSet",
   members: [
      { _id: 0, host: "member1_hostname_or_ip:27017" },
      { _id: 1, host: "member2_hostname_or_ip:27017" },
      { _id: 2, host: "member3_hostname_or_ip:27017" }
   ]
} )

Verify the replica set status by checking `rs.status()` in the mongo shell. You should see all members in an `PRIMARY` or `SECONDARY` state.

rs.status()

2. Connect to a Standalone Instance easy

If you intend to run a single MongoDB instance without replication, ensure your connection string or configuration reflects this. This is a quick fix if replication is not required.

Review your application's connection string or MongoDB driver configuration. If it's trying to connect to a replica set (e.g., includes `replicaSet=...` parameter), remove it.

mongodb://hostname:port/database?replicaSet=myReplicaSet  <-- Remove replicaSet parameter

Ensure your `mongod.conf` file does not have the `replication.replSetName` parameter configured. If it does, comment it out or remove it.

replication:
  # replSetName: "myReplicaSet"

net:
  port: 27017
  bindIp: 127.0.0.1

Restart the `mongod` process with the corrected configuration.

mongod --config /path/to/your/mongod.conf

3. Check MongoDB Version Compatibility medium

Ensure your MongoDB version supports replica sets and that you are using the correct configuration syntax for your version.

Determine the MongoDB version you are running. You can check this by running `mongod --version` or `mongo --version`.

mongod --version

Consult the official MongoDB documentation for your specific version to confirm replica set support and the correct syntax for configuration files and `rs.initiate()` commands.

If you are using a very old version of MongoDB that does not support replica sets, consider upgrading to a supported version or proceeding with standalone configurations.

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Related Errors

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