Salt (SaltStack)

Salt (SaltStack) is an open-source configuration management and remote execution tool designed for infrastructure automation at scale. Originally created by Thomas Hatch in 2011 and acquired by VMware (Broadcom) in 2020, Salt has over 14,000 stars as of 2026 and remains a powerful platform for managing thousands of servers. Salt uses a high-speed message bus (ZeroMQ) and a parallel execution engine to communicate with and manage large numbers of devices simultaneously, making it particularly well-suited for environments with thousands of nodes. Key features include: remote execution (executing commands and scripts across thousands of servers in parallel with sub-second communication via the ZeroMQ message bus), configuration management (defining infrastructure state using YAML-based SLS Salt State files, with idempotent state application ensuring systems converge to the desired configuration), event-driven automation (reacting to system events and state changes in real-time using the Salt Reactor, enabling auto-remediation and dynamic scaling), pillar data (securely storing and distributing sensitive configuration data like passwords and API keys to specific minions), grains (system facts and properties collected from managed nodes, used for targeting and conditional configuration), targeting (selecting nodes for execution based on grain matching, IP ranges, compound expressions, and node groups), Salt modules (thousands of built-in execution modules for package management, service control, file operations, cloud provisioning, database management, and more), Salt Cloud (provisioning virtual machines across AWS, Azure, GCP, VMware, and other cloud providers), Salt SSH (agentless execution via SSH without requiring the Salt minion), beacons (monitoring files, services, and system events for changes and triggering reactions), orchestration (coordinating multi-step workflows across multiple systems), and Salt API (REST API for integrating with external systems).