this is for example and try to build CLI using golang. you can combine with crontab for schedule start stop instance

GCP credentials

• make sure service accout to client instance only

  imam@imam-mv:~$ export GOOGLE_APPLICATION_CREDENTIALS=xxxxx

AWS credentials

• make sure iam to allow read only

  imam@imam-mv:~$ aws configure
  AWS Access Key ID [****************XXXX]: 
  AWS Secret Access Key [****************XXXX]: 
  Default region name [ap-southeast-1]: 

Digitalocean

imam@imam-mv:~$ export DO_TOKEN=xxxxx

• digitalocean keep charge your billing, when droplet has been shutdown.

How to Use

imam@imam-mv:~$ go build -o ectl
imam@imam-mv:~$ ./ectl aws instance --action=start --region=ap-southeast-1 i-xxx i-xxx
imam@imam-mv:~$ ./ectl gcp instance --action=start --region=asia-southeast2 i-xxx i-xxx
imam@imam-mv:~$ ./ectl digitalocean instance --action=start xxx xxx