I'm trying to write a go template that extracts the value of the load balancer. Using --go-template={{status.loadBalancer.ingress}} returns [map[hostname:GUID.us-west-2.elb.amazonaws.com]]% When I add .hostname to the template I get an error saying, "can't evaluate field hostname in type interface {}". I've tried using the range keyword, but I can't seem to get the syntax right.
{
"apiVersion": "v1",
"kind": "Service",
"metadata": {
"creationTimestamp": "2018-07-30T17:22:12Z",
"labels": {
"run": "nginx"
},
"name": "nginx-http",
"namespace": "jx",
"resourceVersion": "495789",
"selfLink": "/api/v1/namespaces/jx/services/nginx-http",
"uid": "18aea6e2-941d-11e8-9c8a-0aae2cf24842"
},
"spec": {
"clusterIP": "10.100.92.49",
"externalTrafficPolicy": "Cluster",
"ports": [
{
"nodePort": 31032,
"port": 80,
"protocol": "TCP",
"targetPort": 8080
}
],
"selector": {
"run": "nginx"
},
"sessionAffinity": "None",
"type": "LoadBalancer"
},
"status": {
"loadBalancer": {
"ingress": [
{
"hostname": "GUID.us-west-2.elb.amazonaws.com"
}
]
}
}
}
try this:
kubectl get svc <name> -o go-template='{{range .items}}{{range .status.loadBalancer.ingress}}{{.hostname}}{{printf "\n"}}{{end}}{{end}}'As you can see from the JSON, the ingress element is an array. You can use the template function index to grab this array element.
Try:
kubectl get svc <name> -o=go-template --template='{{(index .status.loadBalancer.ingress 0 ).hostname}}'This is assuming of course that you're only provisioning a single loadbalancer, if you have multiple, you'll have to use range