Automating AWS server builds from ServiceNow requests.

A lot of organizations are using ServiceNow to manage requests for creating new compute resources in the could ( i.e servers, lambda functions, containers …)

Usually, CMP tools like Scalr, or even ServiceNow Cloud Management can ( to a certain degree ) automate this process, but there are two major issues with these approaches :

1 – For these tools to be used properly they need lengthy customization to fit the business architecture of the organization, mapping all the business units, integrating with existing tools …

2 – It can be expensive, the price per node model can add up quickly for companies with a large number of servers deployed.

This a way to automate server build by using ServerNow Orchestration Module, and Serverless to build the integration.

snow

Creating ServiceNow Form

 

Screen Shot 2018-10-15 at 10.16.32 AM

Screen Shot 2018-10-15 at 10.17.35 AM

 

ServiceNow workflow

Screen Shot 2018-10-14 at 5.38.03 PM

to simplify the process I’ve only used a simple RunScript Step, other activities can be added like CMDB integration, approvals, notifications, etc …

here is a look at what the script does :

  • Gets all the parameters from the form
  • make an API call to API Gateway and Lambda
  • Lambda will trigger

var os = current.variables.os;
var inst_size = current.variables.inst_size;

var request = new sn_ws.RESTMessageV2();
request.setEndpoint('https://9drnhpoorj.execute-api.us-east-1.amazonaws.com/dev/instance');
request.setBasicAuth("apikey1","mutKJWAolpsdfsdflksd8ndew02234LNFQQvq");
request.setHttpMethod('POST');
request.setRequestHeader("Accept", "application/json");
request.setRequestHeader('Content-Type', 'application/json');

request.setStringParameterNoEscape('os',current.variables.os);
request.setStringParameterNoEscape('inst_size',current.variables.inst_size);
request.setStringParameterNoEscape('volume_size',current.variables.volume_size1);

request.setRequestHeader('Content-Type', 'application/json');
request.setRequestBody('{"os":"${os}","inst_size":"${inst_size}"}');
var response = request.execute();

 

The AWS side

To build things on the AWS side, I used Serverless,

check out the code at the github repo

Demo

if I request an EC2 instance that’s an m1.small running an amazon linux OS

Screen Shot 2018-10-14 at 5.49.25 PM

if I take a look at the AWS console I can see that the server is getting created  :

Screen Shot 2018-10-15 at 10.23.14 AM

With the right parameters :

Screen Shot 2018-10-15 at 10.21.09 AM

 

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