The previous post was about AWS SDK for Go and explained to utilize S3 for uploading files. You will explore more AWS SDK for Go to start and stop EC2 instances, usually, you will use this using Lambda like this post. But, I will use the AWS SDK for my Go services. Let's get started!
Initial Project
You may try to start the project from this commit. To check my changes, you may check this commit.
Setup/Install AWS SDK for Go
Other dependencies (exclude S3) you may check from the previous post.
go get github.com/aws/aws-sdk-go-v2/service/ec2
The functions
Currently, the example uses a hardcoded list of instances that I want to start and stop.
- Starting an instance
func (ec2Handler *EC2Handler) StartInstance(ctx context.Context) (err error) {
instanceId := "i-0b33f0e5d8d00d6f3" // list your instances here, if you want to have a list instead of 1 instance. You may need to update the input from InstanceIds: []string{instanceId} to InstancedIds: instanceIds and rename the variable to instanceIds also do some changes in the for loop.
cfg, err := config.LoadDefaultConfig(ctx)
if err != nil {
log.Fatal(err)
}
ec2Client := ec2.NewFromConfig(cfg)
input := &ec2.DescribeInstanceStatusInput{
InstanceIds: []string{instanceId},
}
output, err := ec2Client.DescribeInstanceStatus(ctx, input)
if err != nil {
log.Println(err)
return
}
isRunning := false
for _, instanceStatus := range output.InstanceStatuses {
log.Printf("%s: %s\n", *instanceStatus.InstanceId, instanceStatus.InstanceState.Name)
if *instanceStatus.InstanceId == instanceId && instanceStatus.InstanceState.Name == "running" {
isRunning = true
}
}
if !isRunning {
runInstance := &ec2.StartInstancesInput{
InstanceIds: []string{instanceId},
}
log.Printf("Start %s", instanceId)
if outputStart, errInstance := ec2Client.StartInstances(ctx, runInstance); errInstance != nil {
return
} else {
log.Println(outputStart.StartingInstances)
}
} else {
log.Printf("Skip starting %s", instanceId)
}
return
}
- Stopping an instance
func (ec2Handler *EC2Handler) StopInstance(ctx context.Context) (err error) {
instanceId := "i-0b33f0e5d8d00d6f3"
cfg, err := config.LoadDefaultConfig(ctx)
if err != nil {
log.Fatal(err)
}
ec2Client := ec2.NewFromConfig(cfg)
input := &ec2.DescribeInstanceStatusInput{
InstanceIds: []string{instanceId},
}
output, err := ec2Client.DescribeInstanceStatus(ctx, input)
if err != nil {
log.Println(err)
return
}
isStop := false
for _, instanceStatus := range output.InstanceStatuses {
log.Printf("%s: %s\n", *instanceStatus.InstanceId, instanceStatus.InstanceState.Name)
if *instanceStatus.InstanceId == instanceId && instanceStatus.InstanceState.Name == "stop" {
isStop = true
}
}
if !isStop {
stopInstance := &ec2.StopInstancesInput{
InstanceIds: []string{instanceId},
}
log.Printf("Stop %s", instanceId)
if outputStop, errInstance := ec2Client.StopInstances(ctx, stopInstance); errInstance != nil {
return
} else {
log.Println(outputStop.StoppingInstances)
}
} else {
log.Printf("Skip stop %s", instanceId)
}
return
}
Don't forget to set up the credentials. Currently, I use environment variables.
export AWS_ACCESS_KEY_ID=
export AWS_SECRET_ACCESS_KEY=
export AWS_DEFAULT_REGION=ap-southeast-3
Quite easy, right? You may use AWS SDK for Go for another use case. If you want to explore more the repository, you may visit this link.
bervProject
/
go-microservice-boilerplate
Go Microservice Boilerplate
go-microservice-boilerplate
Go Microservice Boilerplate
Environment
DB_CONNECTION_STRING=
PORT=
Build
go build
Run Locally
go run server.go
Test
go test ./... -cover
LICENSE
MIT
Thanks for reading. Happy exploring!
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