AWS ECS 容器链接：MySQL 连接被拒绝

Question

我试图用这个简单的例子链接 Amazon ECS（容器服务）中的两个容器： http : //docs.aws.amazon.com/AmazonECS/latest/developerguide/example_task_definitions.html

无论出于何种原因，WordPress 容器都无法访问 MySQL 数据库，并且从 WordPress 容器的日志中，我看到以下内容：

Warning: mysqli::mysqli(): (HY000/2002): Connection refused in - on line 10

在DockerHub 上说 WordPress 容器会自动从链接的容器中获取 Root PW 和 HOST IP，那么为什么我会遇到这个问题。

我的 JSON 配置如下所示：

{
  "requiresAttributes": [],
  "taskDefinitionArn": "arn:aws:ecs:us-east-1:996820535158:task-definition/wordpress-task:2",
  "status": "ACTIVE",
  "revision": 2,
  "containerDefinitions": [
    {
      "volumesFrom": [],
      "memory": 128,
      "extraHosts": null,
      "dnsServers": null,
      "disableNetworking": null,
      "dnsSearchDomains": null,
      "portMappings": [
        {
          "hostPort": 8080,
          "containerPort": 80,
          "protocol": "tcp"
        }
      ],
      "hostname": null,
      "essential": true,
      "entryPoint": null,
      "mountPoints": [],
      "name": "wordpress",
      "ulimits": null,
      "dockerSecurityOptions": null,
      "environment": [],
      "links": [
        "mysql:mysql"
      ],
      "workingDirectory": null,
      "readonlyRootFilesystem": null,
      "image": "wordpress",
      "command": null,
      "user": null,
      "dockerLabels": null,
      "logConfiguration": null,
      "cpu": 500,
      "privileged": null,
      "expanded": false
    },
    {
      "volumesFrom": [],
      "memory": 128,
      "extraHosts": null,
      "dnsServers": null,
      "disableNetworking": null,
      "dnsSearchDomains": null,
      "portMappings": [],
      "hostname": null,
      "essential": true,
      "entryPoint": null,
      "mountPoints": [],
      "name": "mysql",
      "ulimits": null,
      "dockerSecurityOptions": null,
      "environment": [
        {
          "name": "MYSQL_ROOT_PASSWORD",
          "value": "root"
        }
      ],
      "links": null,
      "workingDirectory": null,
      "readonlyRootFilesystem": null,
      "image": "mysql:latest",
      "command": null,
      "user": null,
      "dockerLabels": null,
      "logConfiguration": null,
      "cpu": 500,
      "privileged": null,
      "expanded": false
    }
  ],
  "volumes": [],
  "family": "wordpress-task"
}

Answer 1

问题解决：内存设置太低，128对于MySQL来说显然不够，WordPress可以处理。 将内存设置为 300 解决了该问题。