Next, we'll register the user microservice with etcd to make it available for other services to call.

Add a configuration file with the etcd access address.

app/user/manifest/config/etcd.yaml

etcd:  
  address: "srv.com:2379"

Add the registration logic in the entry file:

app/user/main.go

package main  
  
import (  
    _ "github.com/gogf/gf/contrib/drivers/mysql/v2"  
    
    "github.com/gogf/gf/contrib/registry/etcd/v2"  
    "github.com/gogf/gf/contrib/rpc/grpcx/v2"  
    "github.com/gogf/gf/v2/frame/g"  
    "github.com/gogf/gf/v2/os/gctx"  
      
    "proxima/app/user/internal/cmd"
)
  
func main() {  
    var ctx = gctx.New()  
    conf, err := g.Cfg("etcd").Get(ctx, "etcd.address")  
    if err != nil {  
       panic(err)  
    }  
  
    var address = conf.String()  
    grpcx.Resolver.Register(etcd.New(address))  
  
    cmd.Main.Run(ctx)  
}

In fact, the key code for service registration is just one line, while the rest is code for reading the configuration file:

grpcx.Resolver.Register(etcd.New(address))

Restart the project to apply the changes. Then enter the etcd container and execute the following command to verify the registration:

$ etcdctl get "" --prefix --keys-only

This command shows all existing keys in etcd, where we should see our registered service:

/service/default/default/user/latest/{IP}:32001

Service registration can be understood as similar to DNS name resolution. The service name grpc.name in the configuration file can be thought of as analogous to a domain name.