K8s Ingress, initiate ingress controller nginx error? - kubernetes

Question

I have two spring boot container, I want to setup ingress service. As document here says, ingress has two parts, one is controller, the other is resources.
My two resources are two containers: gearbox-rack-eureka-server and gearbox-rack-config-server. The difference is port so that ingress could route traffic by different ports. My yaml files are listed below:
eureka_pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: gearbox-rack-eureka-server
labels:
app: gearbox-rack-eureka-server
purpose: platform_eureka_demo
spec:
containers:
- name: gearbox-rack-eureka-server
image: 192.168.1.229:5000/gearboxrack/gearbox-rack-eureka-server
ports:
- containerPort: 8761
eureka_svc.yaml
apiVersion: v1
kind: Service
metadata:
name: gearbox-rack-eureka-server
labels:
name: gearbox_rack_eureka_server
spec:
selector:
app: gearbox-rack-eureka-server
type: NodePort
ports:
- port: 8761
nodePort: 31501
name: tcp
config_pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: gearbox-rack-config-server
labels:
app: gearbox-rack-config-server
purpose: platform-demo
spec:
containers:
- name: gearbox-rack-config-server
image: 192.168.1.229:5000/gearboxrack/gearbox-rack-config-server
ports:
- containerPort: 8888
env:
- name: EUREKA_SERVER
value: http://172.16.100.83:8761
config_svc.yaml
apiVersion: v1
kind: Service
metadata:
name: gearbox-rack-config-server
labels:
name: gearbox-rack-config-server
spec:
selector:
app: gearbox-rack-config-server
type: NodePort
ports:
- port: 8888
nodePort: 31502
name: tcp
My ingress-nginx controller is mostly copied from the link above,
ingress_nginx_ctl.yaml:
kind: Service
apiVersion: v1
metadata:
name: ingress-nginx
spec:
type: LoadBalancer
selector:
app: ingress-nginx
ports:
- name: http
port: 80
targetPort: http
- name: https
port: 443
targetPort: https
---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
name: ingress-nginx
spec:
replicas: 1
template:
metadata:
labels:
app: ingress-nginx
spec:
terminationGracePeriodSeconds: 60
containers:
- image: nginx:1.13.12
name: ingress-nginx
imagePullPolicy: Always
ports:
- name: http
containerPort: 80
protocol: TCP
- name: https
containerPort: 443
protocol: TCP
livenessProbe:
httpGet:
path: /healthz
port: 10254
scheme: HTTP
initialDelaySeconds: 30
timeoutSeconds: 5
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
args:
- /nginx-ingress-controller
- --default-backend-service=$(POD_NAMESPACE)/nginx-default-backend
I did following commands, they are successful.
kubectl apply -f eureka_pod.yaml
kubectl apply -f eureka_svc.yaml
kubectl apply -f config_pod.yaml
kubectl apply -f config_svc.yaml
Then I got error from execute kubectl apply -f ingress_nginx_ctl.yaml, the pod does not start, logs are listed below:
[root#master3 nginx-ingress-controller]# kubectl get pods
NAME READY STATUS RESTARTS AGE
gearbox-rack-config-server 1/1 Running 0 39m
gearbox-rack-eureka-server 1/1 Running 0 40m
ingress-nginx-686c9975d5-7d464 0/1 CrashLoopBackOff 6 7m
[root#master3 nginx-ingress-controller]# kubectl logs -f ingress-nginx-686c9975d5-7d464
container_linux.go:247: starting container process caused "exec: \"/nginx-ingress-controller\": stat /nginx-ingress-controller: no such file or directory"
I created a directory /nginx-ingress-controller under root, and repeat the steps again, it still said same error. Does someone could point me the problem?
I put my ingress_nginx_res.yaml as follows for reference, it may have errors also.
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: my-ingress
spec:
rules:
- host: 172.16.100.83
http:
paths:
- backend:
serviceName: gearbox-rack-eureka-server
servicePort: 8761
- host: 172.16.100.83
http:
paths:
- path:
backend:
serviceName: gearbox-rack-config-server
servicePort: 8888
==========================================
second edition
After change image link, The previous errors disappear, but still it has following permission problem:
[root#master3 ingress]# kubectl get pods
NAME READY STATUS RESTARTS AGE
gearbox-rack-config-server 1/1 Running 0 15m
gearbox-rack-eureka-server 1/1 Running 0 15m
ingress-nginx-8679f9c8ff-5sxw7 0/1 CrashLoopBackOff 5 12m
The log message is as follows:
[root#master3 kube]# kubectl logs ingress-nginx-8679f9c8ff-5sxw7
W0530 07:54:22.290114 5 client_config.go:533] Neither --kubeconfig nor --master was specified. Using the inClusterConfig. This might not work.
I0530 07:54:22.290374 5 main.go:158] Creating API client for https://10.96.0.1:443
-------------------------------------------------------------------------------
NGINX Ingress controller
Release: 0.15.0
Build: git-df61bd7
Repository: https://github.com/kubernetes/ingress-nginx
-------------------------------------------------------------------------------
I0530 07:54:22.298248 5 main.go:202] Running in Kubernetes Cluster version v1.9 (v1.9.2) - git (clean) commit 5fa2db2bd46ac79e5e00a4e6ed24191080aa463b - platform linux/amd64
F0530 07:54:22.298610 5 main.go:80] ✖ It seems the cluster it is running with Authorization enabled (like RBAC) and there is no permissions for the ingress controller. Please check the configuration
It is RBAC problem. I check the install script which is downloaded from forum:
heapster-rbac.yaml:
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
name: heapster
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:heapster
subjects:
- kind: ServiceAccount
name: heapster
namespace: kube-system
One of related kubelet start argument is as follows: (I do not know whether it is relevant).
Environment="KUBELET_AUTHZ_ARGS=--authorization-mode=Webhook --client-ca-file=/etc/kubernetes/pki/ca.crt"
By which way, I could grant permission to ingress controller? Just put namespace kube-system to ingress_nginx_ctl.yaml?
================================================================
Third edition
I put Kun Li's codes into ingress_nginx_role_rb.yaml, and run the following commands:
kubectl apply -f eureka_pod.yaml
kubectl apply -f eureka_svc.yaml
kubectl apply -f config_pod.yaml
kubectl apply -f config_svc.yaml
kubectl apply -f ingress_nginx_role_rb.yaml (just copy paste from Kun Li's answer)
kubectl apply -f nginx_default_backend.yaml
kubectl apply -f ingress_nginx_ctl.yaml
nginx_default_backend.yaml file is listed below:
kind: Service
apiVersion: v1
metadata:
name: nginx-default-backend
namespace: kube-system
spec:
ports:
- port: 80
targetPort: http
selector:
app: nginx-default-backend
---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
name: nginx-default-backend
namespace: kube-system
spec:
replicas: 1
template:
metadata:
labels:
app: nginx-default-backend
spec:
terminationGracePeriodSeconds: 60
containers:
- name: default-http-backend
image: chenliujin/defaultbackend
livenessProbe:
httpGet:
path: /healthz
port: 8080
scheme: HTTP
initialDelaySeconds: 30
timeoutSeconds: 5
resources:
limits:
cpu: 10m
memory: 20Mi
requests:
cpu: 10m
memory: 20Mi
ports:
- name: http
containerPort: 8080
protocol: TCP
ingress_nginx_ctl.yaml is listed below:
kind: Service
apiVersion: v1
metadata:
name: ingress-nginx
spec:
type: LoadBalancer
selector:
app: ingress-nginx
ports:
- name: http
port: 80
targetPort: http
- name: https
port: 443
targetPort: https
---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
name: ingress-nginx
namespace: kube-system
spec:
replicas: 1
template:
metadata:
labels:
app: ingress-nginx
spec:
terminationGracePeriodSeconds: 60
serviceAccount: lb
containers:
- image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.15.0
name: ingress-nginx
imagePullPolicy: Always
ports:
- name: http
containerPort: 80
protocol: TCP
- name: https
containerPort: 443
protocol: TCP
livenessProbe:
httpGet:
path: /healthz
port: 10254
scheme: HTTP
initialDelaySeconds: 30
timeoutSeconds: 5
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
args:
- /nginx-ingress-controller
- --default-backend-service=$(POD_NAMESPACE)/nginx-default-backend
From here, we could see service ingress-nginx namespace is default, not kube-system. But anyway, controller is up.
[root#master3 ingress]# kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
calico-etcd-cdn8z 1/1 Running 0 11m
calico-kube-controllers-d554689d5-tzdq5 1/1 Running 0 11m
calico-node-dz4d6 2/2 Running 1 11m
coredns-65dcdb4cf-h62bh 1/1 Running 0 11m
etcd-master3 1/1 Running 0 10m
heapster-5c448886d-swp58 1/1 Running 0 11m
ingress-nginx-6ccc799fbc-hq2rm 1/1 Running 0 9m
kube-apiserver-master3 1/1 Running 0 10m
ingress-nginx pod's namespace is kube-system (shown above), but its service's namespace is default.(shown below).
[root#master3 ingress]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
gearbox-rack-config-server NodePort 10.97.211.136 <none> 8888:31502/TCP 43m
gearbox-rack-eureka-server NodePort 10.106.69.13 <none> 8761:31501/TCP 43m
ingress-nginx LoadBalancer 10.105.114.64 <pending> 80:30646/TCP,443:31332/TCP 42m
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 44m
as mentioned in the comments, expert's response help me to move forward.

Answer 1

For ingress-controller, image quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.15.0 should be used. And you need setup nginx-default-backend pod and service.
About RBAC, I think you need a seviceaccount to deploy your nginx-ingress-controller, with the following roles and bindings:
apiVersion: v1
kind: ServiceAccount
metadata:
name: lb
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
name: nginx-ingress-normal
rules:
- apiGroups:
- ""
resources:
- configmaps
- endpoints
- nodes
- pods
- secrets
verbs:
- list
- watch
- apiGroups:
- ""
resources:
- nodes
verbs:
- get
- apiGroups:
- ""
resources:
- services
verbs:
- get
- list
- watch
- apiGroups:
- "extensions"
resources:
- ingresses
verbs:
- get
- list
- watch
- apiGroups:
- ""
resources:
- events
verbs:
- create
- patch
- apiGroups:
- "extensions"
resources:
- ingresses/status
verbs:
- update
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: Role
metadata:
name: nginx-ingress-minimal
namespace: kube-system
rules:
- apiGroups:
- ""
resources:
- configmaps
- pods
- secrets
- namespaces
verbs:
- get
- apiGroups:
- ""
resources:
- configmaps
resourceNames:
- "ingress-controller-leader-dev"
- "ingress-controller-leader-prod"
verbs:
- get
- update
- apiGroups:
- ""
resources:
- configmaps
verbs:
- create
- apiGroups:
- ""
resources:
- endpoints
verbs:
- get
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: RoleBinding
metadata:
name: nginx-ingress-minimal
namespace: kube-system
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: nginx-ingress-minimal
subjects:
- kind: ServiceAccount
name: lb
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
name: nginx-ingress-normal
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: nginx-ingress-normal
subjects:
- kind: ServiceAccount
name: lb
namespace: kube-system