SSH 到 EC2 实例超时

我创建了一个 AWS EC2 实例以在其上设置 prometheus，我创建了一个新的 ssh 密钥对并使用 terraform 配置了该实例，我使用实例类型为“t3.large”和一个 120GB 的 SSD 磁盘，操作系统是 Ubuntu 18.04，并且我可以正常 ssh 到实例。到现在为止一切都还好。

使用 docker 安装 Prometheus 和 Grafana 一段时间后，我回到实例，发现无法登录！我收到以下问题：

ssh: connect to host [ip] port 22: Connection timed out

我确定这不是互联网连接问题，因为我可以通过 ssh 连接到其他实例。使用ip地址或DNS时问题相同，端口22也是开放的。

这是我使用的 terraform 脚本，但我认为它与此无关：

provider "aws" {
  profile = "default"
  region  = "eu-west-1"
}

resource "aws_key_pair" "ubuntu" {
  key_name   = "ubuntu"
  public_key = file("ubuntu.pem.pub")
}

resource "aws_security_group" "ubuntu" {
  name        = "ubuntu-security-group"
  description = "Allow HTTP, HTTPS and SSH traffic"

  ingress {
    description = "SSH"
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  ingress {
    description = "HTTPS"
    from_port   = 443
    to_port     = 443
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  ingress {
    description = "HTTP"
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  ingress {
    description = "HTTP"
    from_port   = 3000
    to_port     = 3000
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  ingress {
    description = "HTTP"
    from_port   = 9090
    to_port     = 9090
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  ingress {
    description = "HTTP"
    from_port   = 9100
    to_port     = 9100
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }



  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }

  tags = {
    Name = "terraform"
  }
}


resource "aws_instance" "ubuntu" {
  key_name      = aws_key_pair.ubuntu.key_name
  ami           = "ami-0dc8d444ee2a42d8a"
  instance_type = "t3.large"

  tags = {
    Name = "ubuntu-prometheus"
  }

  vpc_security_group_ids = [
    aws_security_group.ubuntu.id
  ]

  connection {
    type        = "ssh"
    user        = "ubuntu"
    private_key = file("key")
    host        = self.public_ip
  }

  ebs_block_device {
    device_name = "/dev/sda1"
    volume_type = "gp2"
    volume_size = 120
  }
}

resource "aws_eip" "ubuntu" {
  vpc      = true
  instance = aws_instance.ubuntu.id
}