Implementing SSL Communication in a Patroni/etcd/Postgres Cluster

Problem:

The client seeks to configure SSL communication within an existing Patroni/etcd/Postgres cluster, specifically aiming to switch to HTTPS in the Patroni configuration file to secure communication between components.

Solution:

After a thorough analysis, the following recommendations were made:

Certificate Generation

Utilize OpenSSL or obtain a certificate from a trusted Certificate Authority (CA).
For self-signed certificates, execute a command like openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout private.key -out certificate.crt, customizing the certificate’s validity period and key size.

Configuration Update

Locate the HTTP or REST API section in the patroni.yml file.
Update SSL/TLS or HTTPS configuration options to reflect the paths of the generated certificate and private key files, e.g., ssl: True, ssl_cert_file: /path/to/certificate.crt, ssl_key_file: /path/to/private.key.

Restart Patroni

After modifying the patroni.yml file, restart the Patroni service or process to apply the new configuration settings.

Conclusion:

The client has acknowledged an understanding of the required steps to implement SSL communication within their Patroni/etcd/Postgres cluster and expressed readiness to proceed with the configuration changes. With proper guidance provided by the expert, the client is now equipped to enhance the security of their cluster by transitioning to HTTPS communication.