Curator was written in Python, which allows it to be distributed as code which can run across a wide variety of systems, including Linux, Windows, Mac OS, and any other system or architecture for which a Python interpreter has been written. Curator was also written to be usable by the 4 most recent major release branches of Python: 2.7, 3.4, 3.5, and 3.6. It may even run on other versions, but those versions are not tested.
Unfortunately, this broad support comes at a cost. While Curator happily ran on Python version 2.6, this version had its last update more than 3 years ago. There have been many improvements to security, SSL/TLS and the libraries that support them since then. Not all of these have been back-ported, which results in Curator not being able to communicate securely via SSL/TLS, or in some cases even connect securely.
Because it is impossible to know if a given system has the correct Python
version, leave alone the most recent libraries and modules, it becomes nearly
impossible to guarantee that Curator will be able to make a secure and
error-free connection to a secured Elasticsearch instance for any
RPM/DEB installed modules. This has lead to an increased amount of
troubleshooting and support work for Curator. The precompiled binary packages
were created to address this.
The precompiled binary packages (APT/YUM, Windows) have been compiled with Python 3.6.5, which has all of the up-to-date libraries needed for secure transactions. These packages have been tested connecting to Security (5.x X-Pack) with self-signed PKI certificates. Connectivity via SSL or TLS to other open-source plugins may work, but is not guaranteed.
If you are encountering SSL/TLS errors in Curator, please see the list of common security error messages.