Golang使用Consul详解

{
    "service": {
        "name": "redis", // 在consul面板上显示的服务名
        "id": "redis", // 服务id, 一般通过服务id对服务进行管理, 若不指定则会使用name作为id
        "address": "127.0.0.1", // 服务地址
        "port": 80, // 服务运行的端口
        "tags": [
            "primary"
        ], // 服务的标签, 可以作为服务的额外信息
        //   服务健康检查, 后面介绍
        "checks": [
            {
                "args": [
                    "/bin/check_redis",
                    "-p",
                    "7000"
                ],
                "interval": "30s",
                "timeout" : "60s"
            }
        ]
    }
}

{
  "check": {
    "id": "api",
    "name": "HTTP API on port 5000",
    "http": "https://localhost:5000/health",   //调用接口
    "method": "POST",             
    "header": { "Content-Type": ["application/json"] },
    "body": "{"method":"health"}",
    "interval": "10s",   //
    "timeout": "1s"
  }
}

{
  "check": {
    "id": "ssh",
    "name": "SSH TCP on port 22",
    "tcp": "localhost:22",
    "interval": "10s",
    "timeout": "1s"
  }
}

{
  "check": {
    "id": "mem-util",
    "name": "Memory utilization",
    "args": ["/usr/local/bin/check_mem.py", "-limit", "256MB"],  // 会被拼成 /usr/local/bin/check_mem.py -limit 256MB 来进行调用
    "interval": "10s",
    "timeout": "1s"
  }
}

{
  "check": {
    "id": "mem-util",
    "name": "Service health status",
    "grpc": "127.0.0.1:12345",
    "grpc_use_tls": true,      //是否使用tls, 默认不使用
    "interval": "10s"
  }
}

{
  "check": {
    "id": "mem-util",
    "name": "Service health status",
    "grpc": "127.0.0.1:12345/my_service",
    "grpc_use_tls": true,
    "interval": "10s"
  }
}

package main
import (
	"log"
	"net"

	"github.com/hashicorp/consul/api"
)
func main() {
	// 使用默认配置创建consul客户端
	consulClient, err := api.NewClient(api.DefaultConfig())
	if err != nil {
		log.Fatal(err)
	}
	// 注册服务
	// consulClient.Agent()先获取当前机器上的consul agent节点
	consulClient.Agent().ServiceRegister(&api.AgentServiceRegistration{
		ID:      "MyService",
		Name:    "My Service",
		Address: "127.0.0.1",
		Port:    5050,
		Check: &api.AgentServiceCheck{
			CheckID:  "MyService",
			TCP:      "127.0.0.1:5050",
			Interval: "10s",
			Timeout:  "1s",
		},
	})
	// 运行完成后注销服务
	defer consulClient.Agent().ServiceDeregister("MyService")
	l, err := net.Listen("tcp", ":5050")
	if err != nil {
		log.Fatal(err)
	}
	for {
		conn, err := l.Accept()
		if err != nil {
			log.Fatal(err)
		}
		go func() {
			log.Printf("Ip: %s connected", conn.RemoteAddr().String())
		}()
	}
} 

package main
import (
	"fmt"
	"log"
	"github.com/hashicorp/consul/api"
)
func main() {
	consulClient, err := api.NewClient(api.DefaultConfig())
	if err != nil {
		log.Fatal(err)
	}
	service, _, err := consulClient.Agent().Service("MyService", nil)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Got Service: ip-%s, port-%d", service.Address, service.Port)
}