docker及k8s安装consul

一、docker部署consul集群

参考文献：https://www.cnblogs.com/lonelyxmas/p/10880717.html

                 https://blog.csdn.net/qq_36228442/article/details/89085373

consul是提供服务发现、简单配置管理、分区部署的服务注册发现解决方案。
主要特性：服务发现健康检查基于Key-Value的配置支持TLS安全通讯支持多数据中心部署

consul的实例叫agent
agent有两种运行模式：server和client
每个数据中心至少要有一个server，一般推荐3-5个server（避免单点故障）
client模式agent是一个轻量级进程，执行健康检查，转发查询请求到server。
服务service是注册到consul的外部应用，比如spring web server

以下为docker-compose.yaml文件

version: "3.0"
services:
    consulserver:
        image: progrium/consul:latest
        hostname: consulserver
        ports:
            - "8300:8300"
            - "8400:8400"
            - "8500:8500"
            - "53"
        command: -server -ui-dir /ui -data-dir /tmp/consul --bootstrap-expect=3
    consulserver1:
        image: progrium/consul:latest
        hostname: consulserver1
        depends_on:
            - "consulserver"
        ports:
            - "8301:8300"
            - "8401:8400"
            - "8501:8500"
            - "53"
        command: -server -data-dir /tmp/consul -join consulserver
    consulserver2:
        image: progrium/consul:latest
        hostname: consulserver2
        depends_on:
            - "consulserver"
        ports:
            - "8302:8300"
            - "8402:8400"
            - "8502:8500"
            - "53"
        command: -server -data-dir /tmp/consul -join consulserver

宿主机浏览器访问：http://localhost:8500 或者 http://localhost:8501 或者 http://localhost:8502

创建test.json文件，以脚本形式注册服务到consul：

test.json文件内容如下：

{
    "ID": "test-service1",
    "Name": "test-service1",
    "Tags": [
        "test",
        "v1"
    ],
    "Address": "127.0.0.1",
    "Port": 8000,
    "Meta": {
        "X-TAG": "testtag"
    },
    "EnableTagOverride": false,
    "Check": {
        "DeregisterCriticalServiceAfter": "90m",
        "HTTP": "http://zhihu.com",
        "Interval": "10s"
    }
}

通过 http 接口注册服务（端口可以是8500. 8501， 8502等能够正常访问consul的就行）：

curl -X PUT --data @test.json http://localhost:8500/v1/agent/service/register

 二、k8s部署consul集群

参考文献：https://www.cnblogs.com/tylerzhou/p/11161634.html

                 https://www.jianshu.com/p/b00de040d92e

由于node节点只有两个，所以配置集群也两个实例，测试时候，配置三个实例不能正常工作，所以配置俩个

1、先创建service资源

apiVersion: v1
kind: Service
metadata:
  name: consul
  labels:
    name: consul
spec:
  type: ClusterIP
  ports:
  - name: http
    port: 8500
    targetPort: 8500
#  - name: https
#    port: 8443
#    targetPort: 8443
#  - name: rpc
#    port: 8400
#    targetPort: 8400
#  - name: serflan-tcp
#    port: 8301
#    targetPort: 8301
#  - name: serflan-udp
#    port: 8301
#    targetPort: 8301
#    protocol: "UDP"
#  - name: serfwan-tcp
#    port: 8302
#    targetPort: 8302
#  - name: serfwan-udp
#    port: 8302
#    targetPort: 8302
#    protocol: "UDP"
#  - name: server
#    port: 8300
#    targetPort: 8300
#  - name: consuldns
#    port: 8600
#    targetPort: 8600
  selector:
    app: consul

由于只暴露8500的ui端口，所以将其他端口都没有创建service，service为clusterIP

2、创建statefulset资源

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: consul
spec:
  serviceName: consul
  replicas: 2
  selector:
    matchLabels:
      app: consul
  template:
    metadata:
      labels:
        app: consul
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: app
                    operator: In
                    values:
                      - consul
              topologyKey: kubernetes.io/hostname
      terminationGracePeriodSeconds: 10
      containers:
      - name: consul
        image: consul:latest
        args:
             - "agent"
             - "-server"
             - "-bootstrap-expect=2"
             - "-ui"
             - "-data-dir=/consul/data"
             - "-bind=0.0.0.0"
             - "-client=0.0.0.0"
             - "-advertise=$(PODIP)"
             - "-retry-join=consul-0.consul.$(NAMESPACE).svc.cluster.local"
             - "-retry-join=consul-1.consul.$(NAMESPACE).svc.cluster.local"
             - "-retry-join=consul-2.consul.$(NAMESPACE).svc.cluster.local"
             - "-domain=cluster.local"
             - "-disable-host-node-id"
        env:
            - name: PODIP
              valueFrom:
                fieldRef:
                  fieldPath: status.podIP
            - name: NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
        ports:
            - containerPort: 8500
              name: ui-port
            - containerPort: 8400
              name: alt-port
            - containerPort: 53
              name: udp-port
            - containerPort: 8443
              name: https-port
            - containerPort: 8080
              name: http-port
            - containerPort: 8301
              name: serflan
            - containerPort: 8302
              name: serfwan
            - containerPort: 8600
              name: consuldns
            - containerPort: 8300
              name: server

3、创建ingress，以使用域名访问

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress-consul
  namespace: default
  annotations:
    kubernets.io/ingress.class: "nginx"
spec:
  rules:
  - host: consul.cabel.com
    http:
      paths:
      - path:
        backend:
          serviceName: consul
          servicePort: 8500

以上资源创建完成后就可以访问了：