Added ip resolutiom from instance name

ec2/ec2-ip-from-name/main.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"sort"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/ec2"
+)
+
+func main() {
+
+	instanceName := flag.String("name", "", "Name of the EC2 instance")
+	maxResults := flag.Int("max-results", 1, "Number of results")
+
+	region := flag.String("region", "eu-west-1", "AWS region")
+	flag.Parse()
+
+	if len(*instanceName) < 1 {
+		fmt.Println("Missing instance name")
+		os.Exit(1)
+	}
+
+	config := aws.Config{Region: aws.String(*region)}
+	session := session.New(&config)
+
+	svc := ec2.New(session)
+	params := &ec2.DescribeInstancesInput{
+		Filters: []*ec2.Filter{
+			{
+				Name: aws.String("tag:Name"),
+				Values: []*string{
+					aws.String(*instanceName),
+				},
+			},
+		},
+	}
+	resp, err := svc.DescribeInstances(params)
+
+	if err != nil {
+		fmt.Println(err.Error())
+		os.Exit(3)
+	}
+	ips := make([]string, len(resp.Reservations))
+	for index, reservation := range resp.Reservations {
+		instance := reservation.Instances[0]
+		ips[index] = *instance.PrivateIpAddress
+	}
+
+	sort.Strings(ips)
+	for index, ip := range ips {
+		if index >= *maxResults {
+			break
+		}
+		fmt.Println(ip)
+	}
+}