The selected method is used for all internal communication. For example, when a
client authenticates to a
mongos using one of the supported
mongos then uses the configured internal authentication method to
connect to the required
Enabling internal authentication also enables client authorization.
Keyfiles use SCRAM challenge and response authentication mechanism where the keyfiles contain the shared password for the members.
A key's length must be between 6 and 1024 characters and may only
contain characters in the base64 set. MongoDB strips whitespace
x20) for cross-platform
convenience. As a result, the following operations produce identical
echo -e "mysecretkey" > key1 echo -e "my secret key" > key1 echo -e "my secret key\n" > key2 echo -e "my secret key" > key3 echo -e "my\r\nsecret\r\nkey\r\n" > key4
Starting in MongoDB 4.2, keyfiles for internal membership authentication use YAML format to allow for multiple keys in a keyfile. The YAML format accepts content of:
- a single key string (same as in earlier versions),
- multiple key strings (each string must be enclosed in quotes), or
- sequence of key strings.
The YAML format is compatible with the existing single-key keyfiles that use the text file format.
If the keyfile contains a single key, you can specify the key string with or without quotes
my old secret key1
On UNIX systems, the keyfile must not have group or world permissions. On Windows systems, keyfile permissions are not checked.
You must store the keyfile on each server hosting the member of the replica set or sharded clusters.
|||(1, 2) For MongoDB's encrypted storage engine, the keyfile used for local key management can only contain a single key .|
MongoDB Configuration for Keyfile¶
To specify the keyfile, use the
security.keyFile setting or
--keyFile command line option.
For an example of keyfile internal authentication, see Update Replica Set to Keyfile Authentication.
Members of a replica set or sharded cluster can use x.509 certificates for internal authentication instead of using keyfiles. MongoDB supports x.509 certificate authentication for use with a secure TLS/SSL connection.
Starting in version 4.0, MongoDB disables support for TLS 1.0 encryption on systems where TLS 1.1+ is available. For more details, see Disable TLS 1.0.
Member Certificate Requirements¶
- A single Certificate Authority (CA) must issue all the x.509 certificates for the members of a sharded cluster or a replica set.
- The Distinguished Name (
DN), found in the member certificate's
subject, must specify a non-empty value for at least one of the following attributes: Organization (
O), the Organizational Unit (
OU) or the Domain Component (
The Organization attributes (