[jira] [Created] (KNOX-2157) Knox should check if it's actually up&running

["Sandor Molnar (Jira)" <ji...@apache.org>]

Sandor Molnar created KNOX-2157:
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             Summary: Knox should check if it's actually up&running
                 Key: KNOX-2157
                 URL: https://issues.apache.org/jira/browse/KNOX-2157
             Project: Apache Knox
          Issue Type: New Feature
          Components: Server
    Affects Versions: 1.3.0, 1.2.0, 1.1.0
            Reporter: Sandor Molnar
            Assignee: Sandor Molnar
             Fix For: 1.4.0


As of now, Knox returns a success code in case the process is being created. There should be another way to check if the server is actually up&running and is capable of serving incoming requests.


 My proposal is:
 * the Knox startup script should be modified to run a basic Admin API check in case {{--test-gateway-url}} is defined in the startup command. If this is blank or non-defined we fallback to the existing PID-based check
 * two more optional arguments will be defined for this feature:
 ** {{--test-gateway-retry-attempts}}: indicates the number of tries the startup script should execute before it fails. Defaults to 5.
 ** {{--test-gateway-retry-sleep}}: the amount of time that the test process will wait or sleep before a retry is issued. Defaults to 2s.

The new-style check will use {{curl}} and will return success in case {{$GATEWAY_TEST_URL/gateway/admin/api/v1/version/}} returns an HTTP response with code 200. If this is not true; the startup script should return an error code.



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