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Add configurable file-existence and HTTP health checks

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Add a section to the config file called "health". Within this section,
"filecheckers" and "httpcheckers" list checks to run. Each check
specifies a file or URI, a time interval for the check, and a threshold
specifying how many times the check must fail to reach an unhealthy
state.

Document the new options in docs/configuration.md.

Add unit testing for both types of checkers. Add an UnregisterAll
function in the health package to support the unit tests, and an
Unregister function for consistency with Register.

Fix a string conversion problem in the health package's HTTP checker.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
This commit is contained in:
Aaron Lehmann 2015-08-18 17:19:46 -07:00
parent e4b93d1e6d
commit b09b0ffcf9
6 changed files with 428 additions and 3 deletions
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6
health/checks/checks.go
View file

@ -2,9 +2,11 @@ package checks
import (
"errors"
"github.com/docker/distribution/health"
"net/http"
"os"
"strconv"
"github.com/docker/distribution/health"
)
// FileChecker checks the existence of a file and returns and error
@ -28,7 +30,7 @@ func HTTPChecker(r string) health.Checker {
return errors.New("error while checking: " + r)
}
if response.StatusCode != http.StatusOK {
return errors.New("downstream service returned unexpected status: " + string(response.StatusCode))
return errors.New("downstream service returned unexpected status: " + strconv.Itoa(response.StatusCode))
}
return nil
})