Wildcards on query for AWS cli for elbv2

Question

I'm trying to get the ARN of some LoadBalancer which I only know the prefix of the DNS name.

As an example, aws elbv2 describe-load-balancers --query 'LoadBalancers[].DNSName[]' will print me:

[
    "services-green-********.elb.eu-central-1.amazonaws.com",
    "services-blue-********.elb.eu-central-1.amazonaws.com"
]

Something like

aws elbv2 describe-load-balancers --query "LoadBalancers[?DNSName=='services-green-*']"

is not working because wildcards are not accepted and using filters like at ec2 commands is not possible.

How can I get the ARN without falling back to using jq?

Answer 1

You may try this;

aws elbv2 describe-load-balancers --query 'LoadBalancers[?contains(DNSName, `services-green-*`) == `true`][DNSName]'

You may remove the last [DNSName] if you want the full response. Or replace with DNSName with LoadBalancerArn;

aws elbv2 describe-load-balancers --query 'LoadBalancers[?contains(DNSName, `services-green-*`) == `true`][LoadBalancerArn]'

Just like contains, you can try starts_with if you don't want full wildcard but know how it starts.