docker - ECS容器如何保存日志？

Question

我正在运行 ECS 任务，最近服务 cpu 达到 100% 然后宕机。

我等待实例稳定下来并进入。我正在寻找日志，但似乎 docker 容器重新启动并且日志都消失了(cpu 高时的日志)

下次，我如何确保至少可以看到日志来诊断问题？

我有以下内容，希望能在某处看到一些日志(安装在主机中)

     "mountPoints": [
            {
                "readOnly": null,
                "containerPath": "/var/log/uwsgi",
                "sourceVolume": "logs"
            }
        ],

但是主机中没有/var/log/uwsgi。我可能需要 syslog 和东西..

Answer 1

就您当前的配置而言，logs 完全取决于您在卷部分中定义的路径。

     "mountPoints": [
            {
                "readOnly": null,
                "containerPath": "/var/log/uwsgi",
                "sourceVolume": "logs"
            }
        ],

卷日志 logs 中定义的源路径不是 /var/log/uwsgi，所以你正在挂载

/var/log/uwsgi(容器路径)-> logs 卷(主机路径)。您可以在 logs 卷中定义的路径中找到这些日志。但最好设置类似

            {
                "readOnly": null,
                "containerPath": "/var/log/uwsgi",
                "sourceVolume": "volume_name"
            }

然后音量配置

"volumes": [
    {
      "name": "logs",
      "host": {
        "sourcePath": "/home/ec2-user/logs"
      }
    }
]

来自文档

In the task definition volumes section, define a bind mount with name and sourcePath values.

  "volumes": [
    {
      "name": "webdata",
      "host": {
        "sourcePath": "/ecs/webdata"
      }
    }
  ]

In the containerDefinitions section, define a container with mountPoints values that reference the name of the defined bind mount and the containerPath value to mount the bind mount at on the container.

  "containerDefinitions": [
    {
      "name": "web",
      "image": "nginx",
      "cpu": 99,
      "memory": 100,
      "portMappings": [
        {
          "containerPort": 80,
          "hostPort": 80
        }
      ],
      "essential": true,
      "mountPoints": [
        {
          "sourceVolume": "webdata",
          "containerPath": "/usr/share/nginx/html"
        }
      ]
    }
  ]

bind-mounts-ECS

现在，如果我接受我的建议，我会选择 AWS 日志驱动程序。

在AWS工作，最好的办法是将所有日志推送到CW，但是AWS日志驱动只将容器stdout和stderr日志推送到CW。

使用 AWS 日志驱动程序，您无需担心实例和容器，您将登录 CW 并可以流式传输这些 logs to ELK

          "logConfiguration": {
                "logDriver": "awslogs",
                "options": {
                    "awslogs-group": "awslogs-wordpress",
                    "awslogs-region": "us-west-2",
                    "awslogs-stream-prefix": "awslogs-example"
                }
            }

using_awslogs