README
¶
Go EC2 CLI using Cobra and AWS SDK
This demo shows how to create a simple Cobra CLI app to manage EC2 instances using the Golang AWS SDK. Example usage:
Example usage:
$ go-ec2 version
$ go-ec2 run --type t2.micro demo-vm
$ go-ec2 describe
$ go-ec2 chaos --count 2
$ go-ec2 start <instanceId>
$ go-ec2 stop <instanceId>
$ go-ec2 terminate <instanceId>
Initial application creation
The initial skaffolding of the Go project and CLI application skeleton is taken care
of using the cobra CLI utility program.
$ cobra init go-ec2 --pkg-name github.com/lreimer/go-for-operations/go-ec2 --license MIT --author "Mario-Leander Reimer"
$ cd go-ec2
$ go mod init github.com/lreimer/go-for-operations/go-ec2
$ go build
Finally, add the Makefile and a .goreleaser.yml to build the binary distribution.
Exercise: Add Describe Subcommand
Next, we want to add a describe subcommand that lists all available EC2 instances in an AWS region.
$ cobra add describe
Open the created cmd/describe.go file, perform some cleanup and add the following business logic to the subcommand run function.
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
// Create an EC2 session instance
sess, err := session.NewSession(&aws.Config{
Region: aws.String(Region())},
)
// Create EC2 service client
svc := ec2.New(sess)
// Call to get detailed information on each instance
result, err := svc.DescribeInstances(nil)
if err != nil {
fmt.Println("Error describing EC2 instances.", err)
} else {
fmt.Println("Instances:", result)
}
Exercise: Add Chaos Subcommand
Next, we want to add a chaos subcommand that terminates random tagged EC2 instances in an AWS region.
$ cobra add chaos
Open the created cmd/chaos.go file, perform some cleanup and add the required business logic to the subcommand run function.
Bonus: Add further Subcommands
Next, add the planned subcommands for our CLI application. Once created, perform some cleanup and remove unwanted code.
$ cobra add run
$ cobra add start
$ cobra add stop
$ cobra add terminate
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