Add docker deploy (#18)

Signed-off-by: dengtuo <[email protected]>

Makefile

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+## version
+SERVER_VERSION = v1.0.0
+## command
+GO           = go
+GO_VENDOR    = go mod
+MKDIR_P      = mkdir -p
+
+## build 
+.PHONY: build
+build:
+	GO111MODULE=on $(GO) build -v -o _output/balancer ./
+
+
+## dockerfile
+
+.PHONY: docker.build
+docker.build: 
+	docker build --no-cache --rm --tag balancer:$(SERVER_VERSION) -f ./build/Dockerfile .

build/Dockerfile

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+# Building stage
+FROM golang:1.17.3 AS builder
+
+ENV GO111MODULE=on \
+    CGO_ENABLED=0 \
+    GOOS=linux \
+    GOPROXY="https://goproxy.cn,direct"
+
+WORKDIR /go/src
+
+COPY . /go/src
+
+ENV TIMEZONE "Asia/Shanghai"
+
+RUN go build -v -o _output/balancer ./
+
+FROM reg.hrlyit.com/base/ubuntu:20.04 
+COPY --from=builder /go/src/_output/balancer /opt/
+
+ENTRYPOINT ["./opt/balancer"]

deploy/configmap.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: balancer
+  namespace: default
+data:
+  config.yaml: |
+    schema: http                  # support http and https
+    port: 8089                    # port for balancer
+    ssl_certificate:
+    ssl_certificate_key:
+    tcp_health_check: true
+    health_check_interval: 3      # health check interval (second)
+    # The maximum number of requests that the balancer can handle at the same time
+    # 0 refers to no limit to the maximum number of requests
+    max_allowed: 100
+    location:                     # route matching for reverse proxy
+      - pattern: /
+        proxy_pass:                   # URL of the reverse proxy
+        - "http://192.168.1.1"
+        - "http://192.168.1.2:1015"
+        - "https://192.168.1.2"
+        - "http://my-server.com"
+        balance_mode: round-robin     # load balancing algorithm

deploy/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: balancer
+  namespace: default
+  labels:
+    app: balancer
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: balancer
+  template:
+    metadata:
+      labels:
+        app: balancer
+    spec:
+      containers:
+        - name: balancer
+          image: balancer:v1.0.0
+          imagePullPolicy: IfNotPresent
+          volumeMounts:
+            - name: config
+              mountPath: /opt
+              readOnly: true
+      volumes:
+        - name: config
+          configMap:
+            name: balancer

deploy/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: balancer
+  namespace: default
+spec:
+  type: NodePort
+  selector:
+    app: balancer
+  ports:
+    - name: balancer
+      protocol: TCP
+      nodePort: 30089
+      port: 80
+      targetPort: 8089