Health Checks - distribution/distribution

Health checks are configurations that verify the health of a service or node in a distributed system. They are used to ensure that services are running and able to handle requests. Health checks can be implemented in various ways, such as HTTP requests, script checks, or TCP checks.

The OCI Distribution Specification, which the project https://github.com/distribution/distribution/ adheres to, supports health checks through the “Image Configuration” section of the specification. This section allows for the definition of health checks, including the type of check (HTTP, TCP, or command), the interval and timeout for the check, and the expected response for HTTP checks.

The Go programming language, which is used to implement the project, has libraries for handling HTTP requests and running scripts, making it well-suited for implementing health checks.

Here are some examples of health check configurations in various formats:

HTTP Health Check (HCL format for Consul)

check {
name     = "HTTP Check"
type     = "http"
port     = "80"
path     = "/health"
interval = "5s"
timeout  = "2s"
}

TCP Health Check (HCL format for Consul)

check {
name     = "TCP Check"
type     = "tcp"