amazon-web-services - 亚马逊云服务器 : 503 Service Temporarily Unavailable

Question

我部署了一个简单的 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，请求会导致 503 Service Temporarily Unavailable 响应。

我服务中的事件选项卡显示我的任务耗尽并重新启动，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.

来 self 实例上的 ecs-agent 日志:

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

似乎出于某种原因，您的 Application Load Balancer 没有响应 ECS 运行状况检查调用。

检查您的 Target Group configuration正确指向返回 HTTP 200 的路由。另外，检查您的 Security Group from your Service 是否不会阻止流向您的应用程序正在运行的端口的流量。

更多关于 this here .