def run_script():
    credentials_dict = authenticate( client_id, key, tenant_id )
    compute_client = ComputeManagementClient( credentials_dict['credentials'], credentials_dict['subscription_id'] )
    GROUP_NAME = 'DEV-Central'
    vmname = 'run-script-vm'
    ext_type_name = 'CustomScriptForLinux'
    ext_name = 'varun-script-test'
    params_create = {
        'location':'centralindia',
        'publisher': 'Microsoft.OSTCExtensions',
        'virtual_machine_extension_type': ext_type_name,
        'type_handler_version': '1.5',
        'auto_upgrade_minor_version': True,
        'settings':
        {
            'fileUris': ["https://s3.ap-south-1.amazonaws.com/mybucketprog/custom_script.sh"],
            'commandToExecute': "sh custom_script.sh"
        }
    }
    ext_poller = compute_client.virtual_machine_extensions.create_or_update( GROUP_NAME, vmname,ext_name,params_create )