Add example for TCP loadbalancing
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examples/tcp/nginx/README.md
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examples/tcp/nginx/README.md
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# TCP loadbalancing
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This example show how to implement TCP loadbalancing throught the Nginx Controller
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## Prerequisites
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You need a [Default Backend service](/examples/deployment/nginx/README.md#default-backend) and a [test HTTP service](/examples/PREREQUISITES.md#test-http-service) for this example
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## Config TCP Service
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To configure which services and ports will be exposed:
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```
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$ kubectl create -f nginx-tcp-ingress-configmap.yaml
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configmap "nginx-tcp-ingress-configmap" created
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$ kubectl -n kube-system get configmap
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NAME DATA AGE
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nginx-tcp-ingress-configmap 1 10m
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$ kubectl -n kube-system describe configmap nginx-tcp-ingress-configmap
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Name: nginx-tcp-ingress-configmap
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Namespace: kube-system
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Labels: <none>
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Annotations: <none>
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Data
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====
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9000:
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----
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default/http-svc:80
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```
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The file `nginx-tcp-ingress-configmap.yaml` uses a ConfigMap where the key is the external port to use and the value is
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`<namespace/service name>:<service port>`
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It is possible to use a number or the name of the port
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## Deploy
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```
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$ kubectl create -f nginx-tcp-ingress-controller.yaml
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replicationcontroller "nginx-ingress-controller" created
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$ kubectl -n kube-system get rc
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NAME DESIRED CURRENT READY AGE
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nginx-ingress-controller 1 1 1 3m
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$ kubectl -n kube-system describe rc nginx-ingress-controller
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Name: nginx-ingress-controller
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Namespace: kube-system
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Image(s): gcr.io/google_containers/nginx-ingress-controller:0.9.0-beta.3
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Selector: k8s-app=nginx-tcp-ingress-lb
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Labels: k8s-app=nginx-ingress-lb
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Annotations: <none>
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Replicas: 1 current / 1 desired
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Pods Status: 1 Running / 0 Waiting / 0 Succeeded / 0 Failed
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No volumes.
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Events:
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FirstSeen LastSeen Count From SubObjectPath Type Reason Message
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--------- -------- ----- ---- ------------- -------- ------ -------
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1m 1m 1 replication-controller Normal SuccessfulCreate Created pod: nginx-ingress-controller-mv92m
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$ kubectl -n kube-system get po -o wide
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NAME READY STATUS RESTARTS AGE IP
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default-http-backend-2198840601-fxxjg 1/1 Running 0 2h 172.16.22.4 10.114.51.137
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nginx-ingress-controller-mv92m 1/1 Running 0 2m 172.16.63.6 10.114.51.207
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```
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## Test
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```
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$ (sleep 1; echo "GET / HTTP/1.1"; echo "Host: 172.16.63.6:9000"; echo;echo;sleep 2) | telnet 172.16.63.6 9000
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Trying 172.16.63.6...
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Connected to 172.16.63.6.
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Escape character is '^]'.
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HTTP/1.1 200 OK
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Server: nginx/1.9.11
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Date: Thu, 20 Apr 2017 07:53:30 GMT
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Content-Type: text/plain
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Transfer-Encoding: chunked
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Connection: keep-alive
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f
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CLIENT VALUES:
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1b
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client_address=172.16.63.6
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c
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command=GET
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c
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real path=/
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a
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query=nil
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14
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request_version=1.1
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25
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request_uri=http://172.16.63.6:8080/
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1
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f
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SERVER VALUES:
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2a
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server_version=nginx: 1.9.11 - lua: 10001
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1
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12
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HEADERS RECEIVED:
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16
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host=172.16.63.6:9000
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6
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BODY:
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14
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-no body in request-
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0
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Connection closed by foreign host.
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```
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7
examples/tcp/nginx/nginx-tcp-ingress-configmap.yaml
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7
examples/tcp/nginx/nginx-tcp-ingress-configmap.yaml
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: nginx-tcp-ingress-configmap
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namespace: kube-system
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data:
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9000: "default/http-svc:80"
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53
examples/tcp/nginx/nginx-tcp-ingress-controller.yaml
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53
examples/tcp/nginx/nginx-tcp-ingress-controller.yaml
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apiVersion: v1
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kind: ReplicationController
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metadata:
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name: nginx-ingress-controller
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labels:
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k8s-app: nginx-ingress-lb
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namespace: kube-system
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spec:
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replicas: 1
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selector:
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k8s-app: nginx-tcp-ingress-lb
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template:
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metadata:
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labels:
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k8s-app: nginx-tcp-ingress-lb
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name: nginx-tcp-ingress-lb
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spec:
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terminationGracePeriodSeconds: 60
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containers:
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- image: gcr.io/google_containers/nginx-ingress-controller:0.9.0-beta.3
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name: nginx-tcp-ingress-lb
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readinessProbe:
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httpGet:
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path: /healthz
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port: 10254
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scheme: HTTP
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livenessProbe:
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httpGet:
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path: /healthz
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port: 10254
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scheme: HTTP
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initialDelaySeconds: 10
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timeoutSeconds: 1
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env:
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- name: POD_NAME
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valueFrom:
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fieldRef:
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fieldPath: metadata.name
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- name: POD_NAMESPACE
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valueFrom:
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fieldRef:
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fieldPath: metadata.namespace
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ports:
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- containerPort: 80
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hostPort: 80
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- containerPort: 443
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hostPort: 443
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- containerPort: 9000
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hostPort: 9000
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args:
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- /nginx-ingress-controller
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- --default-backend-service=$(POD_NAMESPACE)/default-http-backend
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- --tcp-services-configmap=$(POD_NAMESPACE)/nginx-tcp-ingress-configmap
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