docker pull consul:latest
//運行單機
docker run -d --restart=always --name consul -d -p 8500:8500 consul
/*
8500 http 端口，用于 http 接口和 web ui
8300 server rpc 端口，同一數(shù)據(jù)中心 consul server 之間通過該端口通信
8301 serf lan 端口，同一數(shù)據(jù)中心 consul client 通過該端口通信
8302 serf wan 端口，不同數(shù)據(jù)中心 consul server 通過該端口通信
8600 dns 端口，用于服務(wù)發(fā)現(xiàn)
-bbostrap-expect 2: 集群至少兩臺服務(wù)器，才能選舉集群leader
-ui：運行 web 控制臺
-bind： 監(jiān)聽網(wǎng)口，0.0.0.0 表示所有網(wǎng)口，如果不指定默認未127.0.0.1，則無法和容器通信
-client ： 限制某些網(wǎng)口可以訪問
*/
//集群
docker run --name consul1 -d -p 8500:8500 -p 8300:8300 -p 8301:8301 -p 8302:8302 -p 8600:8600 consul:latest agent -server -bootstrap-expect 2 -ui -bind=0.0.0.0 -client=0.0.0.0
docker run --name consul2 -d -p 8501:8500 consul agent -server -ui -bind=0.0.0.0 -client=0.0.0.0 -join 172.17.0.2
docker run --name consul2 -d -p 8502:8500 consul agent -server -ui -bind=0.0.0.0 -client=0.0.0.0 -join 172.17.0.2

實現(xiàn)代碼

以下代碼實現(xiàn)一個服務(wù)注冊，服務(wù)發(fā)現(xiàn)，配置共享的功能：

package main
import (
    "net"
    "github.com/gin-gonic/gin"
    "fmt"
    "log"
    "net/http"
    consulapi "github.com/hashicorp/consul/api"
)
const (
    consulAddress = "192.168.100.19:8500"
    serviceId     = "111"
)
func main() {
    r := gin.Default()
    // consul健康檢查回調(diào)函數(shù)
    r.GET("/", func(c *gin.Context) {
        c.JSON(200, gin.H{
            "message": "ok",
        })
    })
    go http.ListenAndServe(":8081", r)
    // 注冊服務(wù)到consul
    ConsulRegister()
    // 從consul中發(fā)現(xiàn)服務(wù)
    ConsulFindServer()
    ConsulCheckHeath()
    ConsulKVTest()
    // 取消consul注冊的服務(wù)
    //ConsulDeRegister()
    var str string
    fmt.Scan(&str)
}
// 注冊服務(wù)到consul
func ConsulRegister() {
    // 創(chuàng)建連接consul服務(wù)配置
    config := consulapi.DefaultConfig()
    config.Address = consulAddress
    client, err := consulapi.NewClient(config)
    if err != nil {
        log.Fatal("consul client error : ", err)
    }
    // 創(chuàng)建注冊到consul的服務(wù)到
    registration := new(consulapi.AgentServiceRegistration)
    registration.ID = serviceId                    // 服務(wù)節(jié)點的名稱
    registration.Name = "go-consul-test"           // 服務(wù)名稱
    registration.Port = 8081                       // 服務(wù)端口
    registration.Tags = []string{"go-consul-test"} // tag，可以為空
    registration.Address = "192.168.3.42"          // 服務(wù) IP 要確保consul可以訪問這個ip
    // 增加consul健康檢查回調(diào)函數(shù)
    check := new(consulapi.AgentServiceCheck)
    check.HTTP = fmt.Sprintf("http://%s:%d", registration.Address, registration.Port)
    check.Timeout = "5s"
    check.Interval = "5s"                        // 健康檢查間隔
    check.DeregisterCriticalServiceAfter = "30s" // 故障檢查失敗30s后 consul自動將注冊服務(wù)刪除
    registration.Check = check
    // 注冊服務(wù)到consul
    err = client.Agent().ServiceRegister(registration)
    if err == nil {
        fmt.Println("ConsulRegister done")
    }
}
// 取消consul注冊的服務(wù)
func ConsulDeRegister() {
    // 創(chuàng)建連接consul服務(wù)配置
    config := consulapi.DefaultConfig()
    config.Address = consulAddress
    client, err := consulapi.NewClient(config)
    if err != nil {
        log.Fatal("consul client error : ", err)
    }
    client.Agent().ServiceDeregister(serviceId)
}
// 從consul中發(fā)現(xiàn)服務(wù)
func ConsulFindServer() {
    // 創(chuàng)建連接consul服務(wù)配置
    config := consulapi.DefaultConfig()
    config.Address = consulAddress
    client, err := consulapi.NewClient(config)
    if err != nil {
        log.Fatal("consul client error : ", err)
    }
    // 獲取所有service
    services, _ := client.Agent().Services()
    for _, value := range services {
        fmt.Println("address:", value.Address)
        fmt.Println("port:", value.Port)
    }
    fmt.Println("=================================")
    // 獲取指定service
    service, _, err := client.Agent().Service(serviceId, nil)
    if err == nil {
        fmt.Println("address:", service.Address)
        fmt.Println("port:", service.Port)
    }
    if err == nil {
        fmt.Println("ConsulFindServer done")
    }
}
func ConsulCheckHeath() {
    // 創(chuàng)建連接consul服務(wù)配置
    config := consulapi.DefaultConfig()
    config.Address = consulAddress
    client, err := consulapi.NewClient(config)
    if err != nil {
        log.Fatal("consul client error : ", err)
    }
    // 健康檢查
    a, b, _ := client.Agent().AgentHealthServiceByID(serviceId)
    fmt.Println("val1:", a)
    fmt.Println("val2:", b)
    fmt.Println("ConsulCheckHeath done")
}
func ConsulKVTest() {
    // 創(chuàng)建連接consul服務(wù)配置
    config := consulapi.DefaultConfig()
    config.Address = consulAddress
    client, err := consulapi.NewClient(config)
    if err != nil {
        log.Fatal("consul client error : ", err)
    }
    // KV, put值
    values := "test"
    key := "go-consul-test"
    client.KV().Put(&consulapi.KVPair{Key: key, Flags: 0, Value: []byte(values)}, nil)
    // KV get值
    data, _, _ := client.KV().Get(key, nil)
    fmt.Println("data:", string(data.Value))
    // KV list
    datas, _, _ := client.KV().List("go", nil)
    for _, value := range datas {
        fmt.Println("val:", value)
    }
    keys, _, _ := client.KV().Keys("go", "", nil)
    fmt.Println("key:", keys)
    fmt.Println("ConsulKVTest done")
}
func localIP() string {
    addrs, err := net.InterfaceAddrs()
    if err != nil {
        return ""
    }
    for _, address := range addrs {
        if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
            if ipnet.IP.To4() != nil {
                return ipnet.IP.String()
            }
        }
    }
    return ""
}