Run multiple service using Iris

package main

import (
    "log"
    "net/http"
    "time"

    "github.com/kataras/iris/v12"
    "github.com/kataras/iris/v12/middleware/recover"

    "golang.org/x/sync/errgroup"
)

var g errgroup.Group

func startApp1() error {
    app := iris.New().SetName("app1")
    app.Use(recover.New())
    app.Get("/", func(ctx iris.Context) {
        app.Get("/", func(ctx iris.Context) {
            ctx.JSON(iris.Map{
                "code":  iris.StatusOK,
                "message": "Welcome server 1",
            })
        })
    })

    app.Build()
   return app.Listen(":8080")
}

func startApp2() error {
    app := iris.New().SetName("app2")
    app.Use(recover.New())
    app.Get("/", func(ctx iris.Context) {
        ctx.JSON(iris.Map{
            "code":  iris.StatusOK,
            "message": "Welcome server 2",
        })
    })

    return app.Listen(":8081")
}

func main() {
    g.Go(startApp1)
    g.Go(startApp2)

    if err := g.Wait(); err != nil {
        log.Fatal(err)
    }
}

Manage multiple Iris instances through the apps package. Read more here.