Manage Node-to-Node Encryption

Network traffic between the individual nodes of an Enterprise Analytics cluster can be encrypted, in order to optimize cluster-internal security.

Understanding Node-to-Node Encryption

Enterprise Analytics supports node-to-node encryption, whereby network traffic between the individual nodes of a cluster is encrypted.

Node-to-node encryption is managed by means of the Couchbase CLI. This page provides a sequence of calls, to exemplify how a cluster can be secured by means of node-to-node encryption. For a complete conceptual overview, see Node-to-Node Encryption.

Set Up Node-to-Node Encryption

The following sequence demonstrates how to set up node-to-node encryption for a cluster, using the Couchbase CLI. The sequence assumes:

The reader’s familiarity with the information provided at Node-to-Node Encryption.
A pre-existing cluster of two nodes, node1-devcluster.com and node2-devcluster.com, both running the latest version of Enterprise Analytics Enterprise Edition.
Node-to-node encryption initially disabled.
Auto-failover initially enabled.

Note that node-to-node encryption-enablement can also be performed when a cluster is being created. See Create a Cluster.

Proceed as follows:

Turn off auto-failover. Use the setting-autofailover CLI command, as follows
```
/opt/enterprise-analytics/bin/couchbase-cli
-c http://node1-devcluster.com:8091 \
-u Administrator \
-p password \
--enable-auto-failover 0
```
The value of 0 assigned to the --enable-auto-failover flag specifies that auto-failover be switched off. If the command is successful, the following output is displayed:
```
SUCCESS: Auto-failover settings modified
```
Enable node-to-node encryption for the cluster. Use the node-to-node-encryption CLI command:
```
/opt/enterprise-analytics/bin/couchbase-cli
-c http://node1-devcluster.com:8091 \
-u Administrator \
-p password \
--enable
```
The --enable flag enables node-to-node encryption for the cluster, at the default level of control. If the command is successful, the following output is displayed:
```
Turned on encryption for node: http://node1-devcluster.com:8091
Turned on encryption for node: http://node2-devcluster.com:8091
SUCCESS: Switched cluster encryption on
```
The output indicates that encryption has been successfully enabled for each node in the cluster.
Establish an appropriate encryption-level for the cluster. This is achieved by the setting-security CLI command, specifying the --cluster-encryption-level parameter. Its value can be control, meaning that server-management information passed between nodes is passed in encrypted form; all, meaning that all information passed between nodes, including data handled by services, is passed in encrypted form; or strict, meaning all with only encrypted communication permitted between nodes and between the cluster and external clients. (Note, however, that after strict has been specified, communication that occurs entirely on a single node using the loopback interface — whereby the machine is identified as either localhost or 127.0.0.1 — is still permitted in non-encrypted form.)

For example:
```
/opt/enterprise-analytics/bin/couchbase-cli
-c http://node1-devcluster.com:8091 \
-u Administrator \
-p password \
--set \
--cluster-encryption-level all
```
Passed as the value for the --cluster-encryption-level flag, all is specified as the new encryption-level for the cluster. If the command is successful, the following output is displayed:
```
SUCCESS: Security settings updated
```

/opt/enterprise-analytics/bin/couchbase-cli
-c node1-devcluster.com:8091 \
-u Administrator \
-p password \
--enable-auto-failover 1 \
--auto-failover-timeout 120 \
--enable-failover-of-server-groups 1 \
--max-failovers 2 \
--can-abort-rebalance 1

+ The parameter values specify that auto-failover be enabled with a timeout of 120 seconds; with a maximum of two, sequential automated failovers able to occur, prior to administrator intervention being required. Automated failover of server groups is enabled, as is the aborting of rebalance.

+ If the command succeeds, and the settings are successfully modified, the following output is displayed:

SUCCESS: Auto-failover settings modified

Confirm that node-to-node encryption is enabled, using the --get parameter to node-to-node-encryption:
```
/opt/enterprise-analytics/bin/couchbase-cli
-c http://node1-devcluster.com:8091 \
-u Administrator \
-p password \
--get
```
If the command is successful, the following output is displayed:
```
Node-to-node encryption is enabled
```
Confirm the established encryption-level, using the --get parameter to setting-security. Note that this call his here piped to the jq program, to optimize output-readability:
```
/opt/enterprise-analytics/bin/couchbase-cli
-c http://node1-devcluster.com:8091 \
-u Administrator \
-p password \
--get | jq '.'
```
If successful, the command returns a JSON document that contains the current security settings for the cluster. The first part of the output may be as follows:
```
{
  "disableUIOverHttp": false,
  "disableUIOverHttps": false,
  "tlsMinVersion": "tlsv1",
  "cipherSuites": [],
  "honorCipherOrder": true,
  "clusterEncryptionLevel": "all",
  "data": {
    "supportedCipherSuites": [
      "TLS_AES_256_GCM_SHA384",
      "TLS_CHACHA20_POLY1305_SHA256",
      "TLS_AES_128_GCM_SHA256",
      "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
            .
            .
            .
```
These contents include information about the cluster’s UI disablement settings, TLS minimum version, and ciper suites (listed per service). The output also contains the current encryption-level setting; which is here shown as all:

For information about UI disablement, see Manage Console Access.

This concludes the sequence of commands.