我需要使用 AWS CLI 找到给定 EC2 实例附加到的负载均衡器。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，并尽可能在 JMESPath 中编写查询。我被困在 JMESPath 表达式的查询格式上。
我发现了这个问题：Filter LoadBalancer By VPC ID，这正是我想要做的，除了按实例 ID 过滤，而不是 VPC ID 。我认为问题在于实例 ID 在数组中。
使用 jq 的工作解决方案：
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"
我觉得我很接近，但缺少一些基本的东西。
AWS 文档中 describe-load-balancers 命令的 JSON 输出示例：
{
"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"
}
}
]
}