Configuring TLS Security for Cloudera Manager
Cloudera Manager supports three levels of TLS security. It is necessary to work through the configuration of Level 1, and then Level 2 TLS to be able to configure Level 3 encryption. The configurations build on each other to reach Level 3 which is the strongest level of TLS security.
- Level 1 (Good) - This level only configures encrypted communication between the browser and Cloudera Manager, and between Agents and the Cloudera Manager Server. See Configuring TLS Encryption Only for Cloudera Manager followed by Level 1: Configuring TLS Encryption for Cloudera Manager Agents for instructions. Level 1 encryption prevents snooping of commands and controls ongoing communication between the Agents and Cloudera Manager.
- Level 2 (Better) - This level includes encrypted communication between the Agents and the Server, as well as strong verification of the Cloudera Manager Server certificate by the Agents. See Level 2: Configuring TLS Verification of Cloudera Manager Server by the Agents. Level 2 provides Agents with an additional level of security by verifying trust for the certificate presented by the Cloudera Manager Server.
- Level 3 (Best) - Encrypted communication between the Agents and the Server. Level 3 TLS includes encrypted communication between the Agents and the Server, strong verification of the Cloudera Manager Server certificate by the Agents and authentication of Agents to the Cloudera Manager Server using self-signed or CA-signed certs. See Level 3: Configuring TLS Authentication of Agents to the Cloudera Manager Server. Level 3 addresses the untrusted network scenario where you need to prevent cluster Servers being spoofed by untrusted Agents running on a host. Cloudera recommends you configure Level 3 TLS encryption for untrusted network environments before enabling Kerberos authentication. This provides secure communication of keytabs between the Cloudera Manager Server and verified Agents across the cluster.
To enable TLS encryption for all connections between your Web browser running the Cloudera Manager Admin Console and the Cloudera Manager Server, see the first 2 steps of Level 1: Configuring TLS Encryption for Cloudera Manager Agents.
For more details on how various aspects of HTTPS communication are handled by the Cloudera Manager Agents and the Cloudera Management Services daemons, see HTTPS Communication in Cloudera Manager.