A self-contained binary that waits for multiple network addresses to become available before executing commands.
is_ready is a lightweight, dependency-free command-line tool that waits for multiple network addresses (like host:port combinations) to become accessible before executing a command. It solves the problem of coordinating startup order for interconnected services, particularly in containerized environments like Docker, ensuring dependent services (e.g., databases, caches) are ready before applications start.
DevOps engineers and developers working with Docker, Docker Compose, or container orchestration who need to manage service dependencies during startup, especially in multi-service applications.
Developers choose is_ready over alternatives because it can wait for multiple addresses simultaneously (unlike single-address tools) and is a standalone binary with zero external dependencies, ensuring portability and simplicity in constrained environments like minimal container images.
Wait for multiple services to become available with zero dependencies
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Can wait for multiple addresses like github.com:80 and google.com:80 at once, unlike alternatives that handle only one, as demonstrated in the examples.
Runs as a standalone binary with no external libraries, ensuring portability and simplicity, especially in minimal container images like Alpine.
Optimized for Docker workflows with official container images and examples for Dockerfiles and Docker Compose, making it easy to embed in containerized deployments.
Allows setting custom timeouts for waiting attempts, with a default of 30 seconds, providing flexibility for different network conditions.
Only performs basic TCP connectivity checks; does not support HTTP status codes, UDP, or custom health checks, which limits use in complex service readiness scenarios.
As a niche tool, it lacks extensive documentation, community support, or integrations compared to more established alternatives like wait-for-it.
While optimized for Docker, this focus may reduce its utility in non-containerized environments or with other orchestration tools like Kubernetes.
is_ready is an open-source alternative to the following products:
wait-for-it is a pure bash script that waits for a TCP host/port to become available, commonly used in containerized applications to handle service dependencies.
wait-for is a shell script utility used in Docker and development environments to wait for a service (like a database) to become available before starting an application.