Question

我需要找到使用AWS CLI附加给定EC2实例的负载均衡器。我有一个使用jq的工作解决方案，但是我想避免将jq作为依赖项安装，并在可能的情况下在JMESPath中编写查询。我坚持使用JMESPath表达式的查询格式。

我发现了这个问题：Filter LoadBalancer By VPC ID，这正是我尝试做的事情，除了按实例ID过滤，而不是VPC ID。我认为问题是实例ID是在数组中。

使用jq工作解决方案：

 aws elb describe-load-balancers | jq -r '.LoadBalancerDescriptions[] | select(.Instances[].InstanceId == "i-12345678") | .LoadBalancerName

我正在尝试使用JMESPath：

aws elb describe-load-balancers --query "LoadBalancerDescriptions[?Instances[].InstanceId=='i-12345678'] | [].LoadBalancerName"

我觉得自己很亲密，但却缺少一些基本的东西。

来自AWS文档的describe-load-balancers命令的示例JSON输出：

{
  "LoadBalancerDescriptions": [
    {
      "Subnets": [
          "subnet-15aaab61"
      ],
      "CanonicalHostedZoneNameID": "Z3DZXE0EXAMPLE",
      "CanonicalHostedZoneName": "my-load-balancer-1234567890.us-west-2.elb.amazonaws.com",
      "ListenerDescriptions": [
          {
              "Listener": {
                  "InstancePort": 80,
                  "LoadBalancerPort": 80,
                  "Protocol": "HTTP",
                  "InstanceProtocol": "HTTP"
              },
              "PolicyNames": []
          },
          {
              "Listener": {
                  "InstancePort": 443,
                  "SSLCertificateId": "arn:aws:iam::123456789012:server-certificate/my-server-cert",
                  "LoadBalancerPort": 443,
                  "Protocol": "HTTPS",
                  "InstanceProtocol": "HTTPS"
              },
              "PolicyNames": [
                  "ELBSecurityPolicy-2015-03"
              ]
          }
      ],
      "HealthCheck": {
          "HealthyThreshold": 2,
          "Interval": 30,
          "Target": "HTTP:80/png",
          "Timeout": 3,
          "UnhealthyThreshold": 2
      },
      "VPCId": "vpc-a01106c2",
      "BackendServerDescriptions": [
          {
              "InstancePort": 80,
              "PolicyNames": [
                  "my-ProxyProtocol-policy"
              ]
          }
      ],
      "Instances": [
          {
              "InstanceId": "i-207d9717"
          },
          {
              "InstanceId": "i-afefb49b"
          }
      ],
      "DNSName": "my-load-balancer-1234567890.us-west-2.elb.amazonaws.com",
      "SecurityGroups": [
          "sg-a61988c3"
      ],
      "Policies": {
          "LBCookieStickinessPolicies": [
              {
                  "PolicyName": "my-duration-cookie-policy",
                  "CookieExpirationPeriod": 60
              }
          ],
          "AppCookieStickinessPolicies": [],
          "OtherPolicies": [
              "my-PublicKey-policy",
              "my-authentication-policy",
              "my-SSLNegotiation-policy",
              "my-ProxyProtocol-policy",
              "ELBSecurityPolicy-2015-03"
          ]
      },
      "LoadBalancerName": "my-load-balancer",
      "CreatedTime": "2015-03-19T03:24:02.650Z",
      "AvailabilityZones": [
          "us-west-2a"
      ],
      "Scheme": "internet-facing",
      "SourceSecurityGroup": {
          "OwnerAlias": "123456789012",
          "GroupName": "my-elb-sg"
      }
    }
  ]
}

Answer 1

aws elb describe-load-balancers --query LoadBalancerDescriptions[?Instances[0].InstanceId==`i-55555555`].LoadBalancerName

Answer 2

使用LoadBalancerDescriptions[?Instances[*].InstanceId==`i-55555555`]遍历实例。

LoadBalancerDescriptions[?Instances[0].InstanceId==`i-55555555`]将仅使用数组中的第一个元素。

Answer 3

由于Instances是一个数组，因此您应该使用contains函数来搜索实例ID。

aws elb describe-load-balancers --query LoadBalancerDescriptions[?contains(Instances[*].InstanceId,`i-12345678`)].LoadBalancerName

JMES Path / AWS - 检索给定实例ID的Load Balancer名称

3 个答案: