ChatGPT Classic (GPT4) - Go AWS EC2 Instance

can you generate me a golang program that creates an aws instance with aws sdk v2, waits until its state is running and status is ok, tests if its ssh interface is up then scp's an arbitrary file to the box

Creating a Go program to perform the tasks you've described involves several steps. The AWS SDK for Go v2 will be used to interact with AWS services. The steps are:

1. Create an AWS EC2 instance.
2. Wait until its state is 'running' and status checks pass.
3. Test if its SSH interface is up.
4. SCP an arbitrary file to the instance.

Below is a basic example to guide you. Note that this program is simplified and assumes you have set up AWS credentials and a key pair for SSH access. Error handling is also basic for clarity.

First, ensure you have the AWS SDK for Go v2 installed:

bash
DownloadCopy code
1go get github.com/aws/aws-sdk-go-v2
2go get github.com/aws/aws-sdk-go-v2/config
3go get github.com/aws/aws-sdk-go-v2/service/ec2

Here's the Go program:

go
DownloadCopy code
1package main
2
3import (
4    "context"
5    "fmt"
6    "log"
7    "os/exec"
8    "time"
9
10    "github.com/aws/aws-sdk-go-v2/aws"
11    "github.com/aws/aws-sdk-go-v2/config"
12    "github.com/aws/aws-sdk-go-v2/service/ec2"
13)
14
15func main() {
16    // Load the Shared AWS Configuration (~/.aws/config)
17    cfg, err := config.LoadDefaultConfig(context.TODO())
18    if err != nil {
19        log.Fatalf("unable to load SDK config, %v", err)
20    }
21
22    // Create an EC2 service client
23    svc := ec2.NewFromConfig(cfg)
24
25    // Specify the details of the instance that you want to create
26    runResult, err := svc.RunInstances(context.TODO(), &ec2.RunInstancesInput{
27        ImageId:      aws.String("ami-xxxxxxx"), // Replace with your AMI ID
28        InstanceType: types.InstanceTypeT2Micro,
29        MinCount:     aws.Int32(1),
30        MaxCount:     aws.Int32(1),
31        KeyName:      aws.String("your-key-pair-name"), // Replace with your key pair name
32    })
33    if err != nil {
34        log.Fatalf("Could not create instance, %v", err)
35    }
36
37    instanceId := *runResult.Instances[0].InstanceId
38    fmt.Println("Created instance", instanceId)
39
40    // Wait until instance is running
41    fmt.Println("Waiting for instance to be in 'running' state...")
42    err = svc.WaitUntilInstanceRunning(context.TODO(), &ec2.DescribeInstancesInput{
43        InstanceIds: []string{instanceId},
44    })
45    if err != nil {
46        log.Fatalf("Error occurred while waiting for instance to be running, %v", err)
47    }
48
49    // Fetch the instance's public DNS name or IP
50    describeResp, err := svc.DescribeInstances(context.TODO(), &ec2.DescribeInstancesInput{
51        InstanceIds: []string{instanceId},
52    })
53    if err != nil {
54        log.Fatalf("Could not describe instances, %v", err)
55    }
56
57    instanceDNS := *describeResp.Reservations[0].Instances[0].PublicDnsName
58
59    // Test SSH access and SCP file - using simple retry logic
60    for i := 0; i < 5; i++ {
61        err := exec.Command("ssh", "-o", "ConnectTimeout=5", "ec2-user@"+instanceDNS, "echo 'SSH Success'").Run()
62        if err == nil {
63            fmt.Println("SSH Interface is up")
64            // SCP Command to copy file
65            err = exec.Command("scp", "path/to/local/file", "ec2-user@"+instanceDNS+":path/to/remote/location").Run()
66            if err != nil {
67                log.Fatalf("Failed to SCP file, %v", err)
68            }
69            fmt.Println("File copied successfully")
70            break
71        }
72        time.Sleep(10 * time.Second)
73    }
74
75    // Further actions...
76}

Replace "ami-xxxxxxx" with the AMI ID you want to use and "your-key-pair-name" with your key pair name. Also, specify the correct paths in the SCP command.

Important Notes:

1. Security Groups and Network Configuration: This example doesn't specify security groups or network configurations. Ensure your instance is launched with a security group that allows SSH access.

2. AWS Credentials: This script assumes your AWS credentials are set up correctly in your environment or AWS credentials file.

3. Error Handling: This script has basic error handling for simplicity. You should enhance this for production code.

4. SSH and SCP Commands: This example uses external ssh and scp commands for simplicity. In a production environment, consider using a Go library for SSH connections for more robust handling.

5. Idempotency and Clean-up: The script does not handle idempotency or resource cleanup (like terminating the instance after use).