hashicorp/consul-template

Features

• Configuration File Generation - Generates physical configuration files on disk by populating templates with service discovery and secret data.
• Configuration Renderers - Generates configuration files by populating templates with real-time data from Consul and Vault.
• Key Retrievals - Retrieves values from a key-value store by path using defaults or existence checks.
• Prefix-Based Key Retrievals - Returns all keys and values under a specific prefix from a registry.
• Go Template Rendering - Uses Go's text/template engine to dynamically render configuration files by injecting discovery and secret data.
• Configuration-Driven Templating Engines - Functions as a template engine that generates configuration files based on cluster catalog and health data.
• Dynamic Configuration Management - Generates application configuration files from Consul and Vault that update automatically when values change.
• Post-Render Command Executions - Consul Template runs shell scripts or commands automatically after templates render to reload applications or restart services.
• Consul Service Discovery - Integrates with Consul for automatic service discovery and health monitoring to drive configuration templates.
• Service Discovery Integrations - Provides integration with service registries to dynamically populate configuration files with healthy service instances.
• Automated Secret Rotation - Automatically tracks credential expiration and refreshes rotating secrets to ensure continuous service availability.
• Secret Management Integrations - Integrates with external secret management services to securely retrieve credentials and certificates for local deployment.
• Secret Retrieval Interfaces - Provides mechanisms for securely fetching credentials and sensitive data from protected stores to populate configuration files.
• Secrets Management - Provides comprehensive management of secrets from HashiCorp Vault, including versioning and lease renewal.
• Secret Vault Integrations - Extracts sensitive credentials from Vault using KV v2 engines and token unwrapping.
• Long-Polling Queries - Uses long-polling blocking queries to monitor remote key-value stores for immediate template re-rendering.
• Service Discovery Registries - Maintains dynamic registries of service locations, node details, and key-value pairs for configuration rendering.
• Service Instance Discovery - Identifies and links to active, healthy service instances via a registry to ensure traffic is routed to available nodes.
• Dynamic Configuration Retrieval - Implements real-time retrieval of service information and key-value pairs from a registry to enable dynamic configurations.
• Data Format Transformations - Converts data structures into JSON, YAML, TOML, or base64 strings with pretty-printing.
• File-Change-Triggered Commands - Executes external shell commands or scripts automatically after a template update to notify or restart services.
• Infrastructure Bootstrapping Templates - Renders system files and environment variables based on cluster state during node deployment or startup.
• Template Functions - Injects custom functions into the template engine to provide specialized data processing or logic.
• Signal-Based Reloading - Triggers application settings refresh by sending OS signals to child processes when configuration files change.
• Cluster Node Management - Allows fetching details for all nodes or specific nodes within a cluster catalog for environment-specific configuration.
• Distributed Render Synchronization - Uses leader election to render templates once and share the output via a global key-value store.
• Distributed Lock Coordination - Prevents simultaneous configuration updates across multiple instances using a shared distributed locking mechanism.
• Distributed Locks - Employs distributed locks to synchronize updates across instances and prevent simultaneous service restarts.
• Query Deduplication - Elects a single instance to fetch shared data and distribute results to others to reduce API load.
• Orchestrator Data Retrieval - Retrieves service discovery data and secrets from a cluster manager to populate configuration templates.
• Rendering Pipeline Plugins - Executes external binaries during the rendering pipeline to process data and return results as strings.
• Resource Querying - Enables querying of services and variables registered within a cluster orchestrator to use as template data.
• Configuration-Driven Process Management - Spawns application processes after rendering and manages their lifecycle via reload or termination signals.
• PKI Automation - Automates the retrieval and rotation of PEM-encoded certificates and keys from a PKI engine.
• Atomic File Writes - Ensures configuration integrity by writing updates to temporary files before performing an atomic rename.
• Standalone Binary Plugin Executions - Executes external binaries to process template data and returns the output as a string.
• Process Supervisors - Manages the lifecycle of child processes, automatically restarting or reloading them when configuration templates change.
• Configurable File Writing - Saves template content to specific paths with configurable file permissions and ownership.
• Process Supervision - Monitors child processes and automatically restarts or reloads them when underlying configuration templates are updated.
• Custom Data Processing Plugins - Executes external plugins with optional payloads to perform custom data processing during the rendering pipeline.

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