Kubernetes 연결을 담당하는 서비스

• 노드포트(NodePort)
• 인그레스(Ingress)

# 노드포스(NodePort) 생성

# 마스터 노드 및 워크노드 정보 

# kubectl get nodes -o wide
NAME     STATUS   ROLES    AGE    VERSION   INTERNAL-IP      EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION                CONTAINER-RUNTIME
m-k8s    Ready    master   3d5h   v1.18.4   192.168.56.10    <none>        CentOS Linux 7 (Core)   3.10.0-1160.90.1.el7.x86_64   docker://18.9.9
w1-k8s   Ready    <none>   3d4h   v1.18.4   192.168.56.101   <none>        CentOS Linux 7 (Core)   3.10.0-1160.90.1.el7.x86_64   docker://18.9.9
w2-k8s   Ready    <none>   3d4h   v1.18.4   192.168.56.102   <none>        CentOS Linux 7 (Core)   3.10.0-1160.90.1.el7.x86_64   docker://18.9.9
w3-k8s   Ready    <none>   3d4h   v1.18.4   192.168.56.103   <none>        CentOS Linux 7 (Core)   3.10.0-1160.90.1.el7.x86_64   docker://18.9.9

 

# 파드 오브젝트 스펙 노드포트 서비스 

# cat nodeport.yaml

apiVersion: v1
kind: Service               # kind : Service

metadata:                   # Metadata 서비스의 이름
  name: np-svc
spec:                       # Spec 셀렉터의 레이블 지정
  selector:
    app: np-pods
  ports:                    # 사용할 프토토콜과 포트들을 지정
    - name: http
      protocol: TCP
      port: 80
      targetPort: 80
      nodePort: 30000
  type: NodePort            # 서비스 타입을 설정

 

# 파드 생성 

# kubectl create deployment np-pods --image=sysnet4admin/echo-hname
deployment.apps/np-pods created

# 파드 노드포트 서비스 생성
# kubectl create -f nodeport.yaml

# kubectl get pods -o wide
NAME                                             READY   STATUS    RESTARTS   AGE     IP               NODE     NOMINATED NODE   READINESS GATES
np-pods-5767d54d4b-txwm4                         1/1     Running   0          10m     172.16.103.169   w2-k8s   <none>           <none>

# kubectl get services
NAME                            TYPE           CLUSTER-IP       EXTERNAL-IP     PORT(S)        AGE
np-svc                          NodePort       10.104.110.226   <none>          80:30000/TCP   7m32s

 

 

 

# 인그레스(Ingress) 생성

 

# cat ingress-config.yaml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: ingress-nginx
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - http:
      paths:
      - path:
        backend:
          serviceName: hname-svc-default
          servicePort: 80
      - path: /ip
        backend:
          serviceName: ip-svc
          servicePort: 80
      - path: /your-directory
        backend:
          serviceName: your-svc
          servicePort: 80

 

# cat ingress-nginx.yaml
# All of sources From https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.30.0/deploy/static/mandatory.yaml
# clone from above to sysnet4admin

apiVersion: v1
kind: Namespace
metadata:
  name: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---

kind: ConfigMap
apiVersion: v1
metadata:
  name: nginx-configuration
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: tcp-services
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: udp-services
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nginx-ingress-serviceaccount
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  name: nginx-ingress-clusterrole
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
rules:
  - apiGroups:
      - ""
    resources:
      - configmaps
      - endpoints
      - nodes
      - pods
      - secrets
    verbs:
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - nodes
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - services
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - events
    verbs:
      - create
      - patch
  - apiGroups:
      - "extensions"
      - "networking.k8s.io"
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - "extensions"
      - "networking.k8s.io"
    resources:
      - ingresses/status
    verbs:
      - update

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: Role
metadata:
  name: nginx-ingress-role
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
rules:
  - apiGroups:
      - ""
    resources:
      - configmaps
      - pods
      - secrets
      - namespaces
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - configmaps
    resourceNames:
      # Defaults to "<election-id>-<ingress-class>"
      # Here: "<ingress-controller-leader>-<nginx>"
      # This has to be adapted if you change either parameter
      # when launching the nginx-ingress-controller.
      - "ingress-controller-leader-nginx"
    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-role-nisa-binding
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: nginx-ingress-role
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount
    namespace: ingress-nginx

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: nginx-ingress-clusterrole-nisa-binding
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: nginx-ingress-clusterrole
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount
    namespace: ingress-nginx

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-ingress-controller
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: ingress-nginx
      app.kubernetes.io/part-of: ingress-nginx
  template:
    metadata:
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
      annotations:
        prometheus.io/port: "10254"
        prometheus.io/scrape: "true"
    spec:
      # wait up to five minutes for the drain of connections
      terminationGracePeriodSeconds: 300
      serviceAccountName: nginx-ingress-serviceaccount
      nodeSelector:
        kubernetes.io/os: linux
      containers:
        - name: nginx-ingress-controller
          image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.30.0
          args:
            - /nginx-ingress-controller
            - --configmap=$(POD_NAMESPACE)/nginx-configuration
            - --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
            - --udp-services-configmap=$(POD_NAMESPACE)/udp-services
            - --publish-service=$(POD_NAMESPACE)/ingress-nginx
            - --annotations-prefix=nginx.ingress.kubernetes.io
          securityContext:
            allowPrivilegeEscalation: true
            capabilities:
              drop:
                - ALL
              add:
                - NET_BIND_SERVICE
            # www-data -> 101
            runAsUser: 101
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          ports:
            - name: http
              containerPort: 80
              protocol: TCP
            - name: https
              containerPort: 443
              protocol: TCP
          livenessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          readinessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          lifecycle:
            preStop:
              exec:
                command:
                  - /wait-shutdown

---

apiVersion: v1
kind: LimitRange
metadata:
  name: ingress-nginx
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  limits:
  - min:
      memory: 90Mi
      cpu: 100m
    type: Container

 

# cat ingress.yaml
apiVersion: v1
kind: Service
metadata:
  name: nginx-ingress-controller
  namespace: ingress-nginx
spec:
  ports:
  - name: http
    protocol: TCP
    port: 80
    targetPort: 80
    nodePort: 30100
  - name: https
    protocol: TCP
    port: 443
    targetPort: 443
    nodePort: 30101
  selector:
    app.kubernetes.io/name: ingress-nginx
  type: NodePort

 

 

# kubectl create deployment in-hname-pod --image=sysnet4admin/echo-hname
deployment.apps/in-hname-pod created

# kubectl create deployment in-ip-pod --image=sysnet4admin/echo-ip
deployment.apps/in-ip-pod created

# kubectl apply -f ingress-nginx.yaml
namespace/ingress-nginx created
configmap/nginx-configuration created
configmap/tcp-services created
configmap/udp-services created
serviceaccount/nginx-ingress-serviceaccount created
clusterrole.rbac.authorization.k8s.io/nginx-ingress-clusterrole created
role.rbac.authorization.k8s.io/nginx-ingress-role created
rolebinding.rbac.authorization.k8s.io/nginx-ingress-role-nisa-binding created
clusterrolebinding.rbac.authorization.k8s.io/nginx-ingress-clusterrole-nisa-binding created
deployment.apps/nginx-ingress-controller created
limitrange/ingress-nginx created

# kubectl apply -f ingress-config.yaml
ingress.networking.k8s.io/ingress-nginx configured

# kubectl apply -f ingress.yaml
service/nginx-ingress-controller created

# kubectl expose deployment in-hname-pod --name=hname-svc-default --port=80,443
service/hname-svc-default exposed

# kubectl expose deployment in-ip-pod --name=ip-svc --port=80,443
service/ip-svc exposed

# kubectl get pods -n ingress-nginx
NAME                                        READY   STATUS    RESTARTS   AGE
nginx-ingress-controller-5bb8fb4bb6-mnx88   1/1     Running   0          23s

# kubectl get ingress
NAME            CLASS    HOSTS   ADDRESS   PORTS   AGE
ingress-nginx   <none>   *                 80      40m

# kubectl get services -n ingress-nginx
NAME                       TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
nginx-ingress-controller   NodePort   10.101.20.235   <none>        80:30100/TCP,443:30101/TCP   20s

# kubectl get services
NAME                            TYPE           CLUSTER-IP       EXTERNAL-IP     PORT(S)          AGE
hname-svc-default               ClusterIP      10.97.228.75     <none>          80/TCP,443/TCP   18s
ip-svc                          ClusterIP      10.108.49.235    <none>          80/TCP,443/TCP   9s

# kubectl get pods
NAME                                             READY   STATUS    RESTARTS   AGE
in-hname-pod-8565c86448-d8q9h                    1/1     Running   0          2m40s
in-ip-pod-76bf6989d-j7pdk                        1/1     Running   0          2m30s