FesonX opened a new issue #892:
URL: https://github.com/apache/apisix-ingress-controller/issues/892
### Issue description
I **create an Ingress reference a service httpbin NOT exists in current
namespace**.
After a create the resource and delete, the APISIX Ingress Controller
service panic and restart.
### Environment
- your apisix-ingress-controller version (output of
apisix-ingress-controller version --long):
> apache/apisix-ingress-controller:1.4.0
- your Kubernetes cluster version (output of kubectl version):
> Server Version: version.Info{Major:"1", Minor:"22+",
GitVersion:"v1.22.3-aliyun.1",
GitCommit:"2d7fa03ee32075acb101bc7286176439c3edddf1", GitTreeState:"clean",
BuildDate:"2022-01-18T14:15:16Z", GoVersion:"go1.16.9", Compiler:"gc",
Platform:"linux/amd64"}
- if you run apisix-ingress-controller in Bare-metal environment, also show
your OS version (uname -a):
### Minimal test code / Steps to reproduce
1. Create a httpbin service in namespace called demo
```bash
kubectl -n demo run httpbin --image-pull-policy=IfNotPresent --image
kennethreitz/httpbin --port 80
kubectl -n demo expose pod httpbin --port 80
```
2. Switch to a namespace called apisix, and I forgot to create Ingress
resource with explicit namespace option.
The ingress service like this, which doesn't have a namespace in metadata,
save it as `ingress-example.yaml`
```yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: httpserver-ingress
spec:
# apisix-ingress-controller is only interested in Ingress
# resources with the matched ingressClass name, in our case,
# it's apisix.
ingressClassName: apisix
rules:
- host: local.httpbin.org
http:
paths:
- backend:
service:
name: httpbin
port:
number: 80
path: /
pathType: Prefix
```
3. create and then delete the ingress.
```bash
kubectl create -f ingress-example.yaml
kubectl delete -f ingress-example.yaml
```
### Actual result
the APISIX Ingress Controller service panic and restart.
### Error log
```
2022-03-01T16:43:53+08:00 [31merror[0m translation/ingress.go:86
failed to translate ingress backend to upstream {"error": "endpoints: endpoints
\"httpbin\" not found", "ingress": "&Ingress{ObjectMeta:{httpserver-ingress
apisix 30a87b4b-5238-4ed3-9522-6a053979277b 24129335 1 2022-03-01 16:43:46
+0800 HKT <nil> <nil> map[] map[] [] [] [{kubectl-create Update
[networking.k8s.io/v1](http://networking.k8s.io/v1) 2022-03-01 16:43:46 +0800
HKT FieldsV1 {\"f:spec\":{\"f:ingressClassName\":{},\"f:rules\":{}}}
}]},Spec:IngressSpec{DefaultBackend:nil,TLS:[]IngressTLS{},Rules:[]IngressRule{IngressRule{Host:[local.httpbin.org](http://local.httpbin.org/),IngressRuleValue:IngressRuleValue{HTTP:&HTTPIngressRuleValue{Paths:[]HTTPIngressPath{HTTPIngressPath{Path:/,Backend:IngressBackend{Resource:nil,Service:&IngressServiceBackend{Name:httpbin,Port:ServiceBackendPort{Name:,Number:80,},},},PathType:*Prefix,},},},},},},IngressClassName:*apisix,},Status:IngressStatus{LoadBalancer:{[]},},}"}
2022-03-01T16:43:53+08:00 [31merror[0m ingress/ingress.go:131 failed
to translate ingress {"error": "endpoints: endpoints \"httpbin\" not
found", "ingress": {}}
2022-03-01T16:43:53+08:00 [33mwarn[0m ingress/ingress.go:231 sync
ingress failed, will retry {"object":
{"Type":3,"Object":{"Key":"apisix/httpserver-ingress","GroupVersion":"networking/v1","OldObject":null},"Tombstone":{}},
"error": "[ingress.networking.k8s.io](http://ingress.networking.k8s.io/)
\"httpserver-ingress\" not found"}
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x18cb92c]
goroutine 271 [running]:
[github.com/apache/apisix-ingress-controller/pkg/ingress.(*ingressController).handleSyncErr](http://github.com/apache/apisix-ingress-controller/pkg/ingress.(*ingressController).handleSyncErr)(0xc000689e60,
0x198c020, 0xc000aca150, 0x1f9e100, 0xc000a88a00)
/build/controller/pkg/ingress/ingress.go:237 +0x7ac
[github.com/apache/apisix-ingress-controller/pkg/ingress.(*ingressController).runWorker](http://github.com/apache/apisix-ingress-controller/pkg/ingress.(*ingressController).runWorker)(0xc000689e60,
0x1fd9bf0, 0xc00052e040)
/build/controller/pkg/ingress/ingress.go:81 +0xcc
created by
[github.com/apache/apisix-ingress-controller/pkg/ingress.(*ingressController).run](http://github.com/apache/apisix-ingress-controller/pkg/ingress.(*ingressController).run)
/build/controller/pkg/ingress/ingress.go:68 +0x230
```
### Expected result
A more **CLEAER** error message describe the absent service.
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