AWS ECS：503 服务暂时不可用

Question

我已经部署了一个简单的 Express 服务器，它为 Angular 7 应用程序执行 SSR。 它运行没有问题，但一段时间后，请求导致 503 服务临时不可用响应。

我的服务中的事件选项卡显示我的任务正在耗尽和重新启动，但没有其他异常。 我在实例的 ecs-agent 日志中没有看到任何奇怪的东西，其他我的任务发送容器停止/启动事件。

从我的服务的事件选项卡：

af81a908-d0ae-4f8d-a19f-4f5723053c71
2019-03-26 13:15:28 -0700
service ui has started 1 tasks: task 61e77740-7b6a-4785-a5c8-9e7581a79745.
8bc7eb29-6a22-4af8-9994-57f2cfd7ad26
2019-03-26 13:14:55 -0700
service ui has begun draining connections on 1 tasks.
cb064206-0ed4-4b68-b528-957175a93196
2019-03-26 13:14:55 -0700
service ui deregistered 1 targets in target-group contrast-fm-target-group
398e8407-17fa-466e-a482-1840f7b9674c
2019-03-26 11:40:31 -0700
service ui has reached a steady state.

从我的实例上的 ecs-agent 登录：

2019-03-26T20:41:02Z [INFO] Managed task [arn:aws:ecs:us-west-2:584648718741:task/13cfb2bc-d40a-4c5b-be47-f73dc2ed28ea]: sending task change event [arn:aws:ecs:us-west-2:584648718741:task/13cfb2bc-d40a-4c5b-be47-f73dc2ed28ea -> STOPPED, Known Sent: RUNNING, PullStartedAt: 2019-03-26 20:40:56.5934327 +0000 UTC m=+24378.048113509, PullStoppedAt: 2019-03-26 20:40:56.769284895 +0000 UTC m=+24378.223965695, ExecutionStoppedAt: 2019-03-26 20:41:02.41672748 +0000 UTC m=+24383.871408417]
2019-03-26T20:41:02Z [INFO] TaskHandler: batching container event: arn:aws:ecs:us-west-2:584648718741:task/13cfb2bc-d40a-4c5b-be47-f73dc2ed28ea contrast-ui -> STOPPED, Exit 1, , Ports [{3000 80 0.0.0.0 0}], Known Sent: RUNNING
2019-03-26T20:41:02Z [INFO] TaskHandler: Adding event: TaskChange: [arn:aws:ecs:us-west-2:584648718741:task/13cfb2bc-d40a-4c5b-be47-f73dc2ed28ea -> STOPPED, Known Sent: RUNNING, PullStartedAt: 2019-03-26 20:40:56.5934327 +0000 UTC m=+24378.048113509, PullStoppedAt: 2019-03-26 20:40:56.769284895 +0000UTC m=+24378.223965695, ExecutionStoppedAt: 2019-03-26 20:41:02.41672748 +0000 UTC m=+24383.871408417, arn:aws:ecs:us-west-2:584648718741:task/13cfb2bc-d40a-4c5b-be47-f73dc2ed28ea contrast-ui -> STOPPED, Exit 1, , Ports [{3000 80 0.0.0.0 0}], Known Sent: RUNNING] sent: false
2019-03-26T20:41:02Z [INFO] TaskHandler: Sending task change: TaskChange: [arn:aws:ecs:us-west-2:584648718741:task/13cfb2bc-d40a-4c5b-be47-f73dc2ed28ea -> STOPPED, Known Sent: RUNNING, PullStartedAt: 2019-03-26 20:40:56.5934327 +0000 UTC m=+24378.048113509, PullStoppedAt: 2019-03-26 20:40:56.769284895 +0000 UTC m=+24378.223965695, ExecutionStoppedAt: 2019-03-26 20:41:02.41672748 +0000 UTC m=+24383.871408417, arn:aws:ecs:us-west-2:584648718741:task/13cfb2bc-d40a-4c5b-be47-f73dc2ed28ea contrast-ui -> STOPPED, Exit 1, , Ports [{3000 80 0.0.0.0 0}], Known Sent: RUNNING] sent: false
2019-03-26T20:41:02Z [INFO] Managed task [arn:aws:ecs:us-west-2:584648718741:task/13cfb2bc-d40a-4c5b-be47-f73dc2ed28ea]: sent task change event [arn:aws:ecs:us-west-2:584648718741:task/13cfb2bc-d40a-4c5b-be47-f73dc2ed28ea -> STOPPED, Known Sent: RUNNING, PullStartedAt: 2019-03-26 20:40:56.5934327 +0000 UTC m=+24378.048113509, PullStoppedAt: 2019-03-26 20:40:56.769284895 +0000 UTC m=+24378.223965695, ExecutionStoppedAt: 2019-03-26 20:41:02.41672748 +0000 UTC m=+24383.871408417]
2019-03-26T20:41:02Z [WARN] DockerGoClient: Unable to decode stats for container d999c0b9afba34f3e7e77e5d34a29c64edb931b1fbc99f53ccfe403c4490db9f: context canceled
2019-03-26T20:41:02Z [INFO] Container d999c0b9afba34f3e7e77e5d34a29c64edb931b1fbc99f53ccfe403c4490db9f is terminal, stopping stats collection
2019-03-26T20:41:04Z [INFO] Saving state! module="statemanager"

Answer 1

似乎由于某种原因，您的应用程序负载均衡器没有响应 ECS 运行状况检查调用。

检查您的目标组配置是否正确指向返回 HTTP 200的路由。 此外，检查您的服务中的安全组是否没有阻止到您的应用程序正在运行的端口的流量。

更多关于这里。