CFEngine vs Rex

CFEngine automates infrastructure, security, and compliance by moving managed systems toward a state defined in policy. Users describe desired infrastructure states in CFEngine’s domain-specific language, and lightweight agents work to bring each device into compliance. By default, an agent contacts the CFEngine hub every five minutes. The system runs on embedded devices, servers, cloud systems, and mainframes, and is designed for tens or hundreds of thousands of nodes. Enterprise adds the Mission Portal web interface, reporting backed by an SQL database, REST APIs, compliance reports, policy analysis, alerts, inventory and change reporting, file-integrity monitoring, and performance monitoring. Dashboards provide compliance and performance views, alerts, and customizable sharing. Secure bootstrap uses mutual authentication, key exchange, and encrypted TLS communication. Community Edition is free under GNU GPL, supports Linux, and includes community support. Enterprise is free for up to 25 hosts; pricing beyond that is available on request. The supported operating systems listed include Linux distributions and Windows.

Rex is a free, open-source automation framework for managing local computers and remote machines over SSH. It runs self-hosted and agentless on Linux and Windows, with support also listed for RHEL/CentOS, Fedora, OpenWRT, BSDs, and Solaris. Projects keep inventory, environments, authentication details, and tasks in a Rexfile. You can combine local or remote execution, push or pull management, and imperative or declarative styles. Tasks can install packages, upload configuration files, start services, and trigger actions when files change. Rex uses a DSL compatible with Perl syntax and can be extended with Perl modules or custom code. Authentication documentation covers passwords, SSH keys, passphrases, external credential sources, and ssh-agent. The control host needs Perl and dependencies; managed hosts need Perl 5 and a valid SSH account. Installation is recommended through CPAN, with package-manager and source options. Apache 2.0 licensing applies to Rex and its parts.