Roll it out, roll it back, never redeploy
Blog post from Railway
Feature flags have been introduced on Railway to provide a safer and more flexible way to manage feature rollouts in production environments. This approach allows developers to toggle features on or off at runtime without requiring redeployment, facilitating a controlled and gradual release process. By integrating feature flags into the dashboard, CLI, SDK, and MCP, developers can create flags, set default values, and define targeting rules to specify conditions under which features are enabled for specific user groups. This system simplifies the process of rolling out new features incrementally, starting with internal teams and expanding to a percentage of users, while allowing for quick rollbacks if issues arise. Feature flags act like dynamic environment variables, updating without redeploys and offering clear, reproducible evaluations of why a user sees a particular feature state. The system prioritizes default values to prevent unexpected behavior from conflicting rules, ensuring a stable production environment. While currently resolving to literal values, Railway is exploring further applications of this context-based resolution system.
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