docker - 将 Marathon Health Check 与命令协议(protocol)和容器一起使用时的奇怪行为

Question

我无法弄清楚为什么以下请求不会在 Marathon 中开始健康检查。容器已启动，但状态仍为 Deploying

{
  "id": "bridged-webapp",
  "cmd": "python3 -m http.server 8080",
  "cpus": 0.1,
  "mem": 64.0,
  "instances": 1,
  "container": {
     "type": "DOCKER",
     "docker": {
       "image": "python:3",
        "network": "BRIDGE",
        "portMappings": [
           { 
             "containerPort": 8080,
             "hostPort": 31313,
             "servicePort": 9000,
             "protocol": "tcp"
           }
        ]
      }
    },
  "healthChecks": [
    {
        "protocol": "COMMAND",
        "command": { "value": "echo 0" },
        "maxConsecutiveFailures": 3
    }
   ]
}

当我查看 Marathon 的日志时，它基本上只是说健康检查已经开始，但仅此而已:

Aug 28 16:52:33 cnode2 marathon[11495]: [2015-08-28 16:52:33,603] INFO   Adding health check for app [/bridged-webapp] and version [2015-08-28T16:52:33.500Z]: [HealthCheck(Some(/),COMMAND,0,Some(Command(echo 0)),300 seconds,60 seconds,20 seconds,3,false)] (mesosphere.marathon.health.MarathonHealthCheckManager$$EnhancerByGuice$$d8828133:76)
Aug 28 16:52:33 cnode2 marathon[11495]: [INFO] [08/28/2015 16:52:33.604] [marathon-akka.actor.default-dispatcher-693] [akka://marathon/user/$kg] Starting health check actor for app [/bridged-webapp] and healthCheck [HealthCheck(Some(/),COMMAND,0,Some(Command(echo 0)),300 seconds,60 seconds,20 seconds,3,false)]
Aug 28 16:52:33 cnode2 marathon[11495]: [INFO] [08/28/2015 16:52:33.627] [marathon-akka.actor.default-dispatcher-694] [akka://marathon/user/MarathonScheduler/$a/DeploymentManager/4f3a1a8e-8934-441a-9c55-b7cf332893e2/$a] Successfully started 0 instances of /bridged-webapp
Aug 28 16:52:37 cnode2 marathon[11495]: [2015-08-28 16:52:37,080] INFO Received status update for task bridged-webapp.2f4399a5-4da5-11e5-b538-080027bb2503: TASK_RUNNING () (mesosphere.marathon.MarathonScheduler$$EnhancerByGuice$$b7a64e04:100)

在 UI 中，作业运行状况是灰色的，这意味着运行状况检查是未知的。

真正奇怪的是，如果我运行相同的工作但没有容器它可以工作。

有任何想法吗 ？

Answer 1

更新:
结果发现命令运行状况检查不适用于 docker executor.... 一位同事为此打开了一个问题:
https://github.com/mesosphere/marathon/issues/2140
我们至少会尽快更新文档。

感谢您发现这一点!