API Unregistered in API manager

API manager showing up as "Unregistered " even after publishing the API to cloudhub

Check out the setting of clientid and secretkey in Anypoint Studio. Enter the value if missing

Issue fixed

S3 Bucket Policy - Applying security when redirecting from a domain

If you want to apply S3 bucket policy to protect the GET access originating from a URL , check this example out :

Restricting Access to a Specific HTTP Referrer 

https://docs.aws.amazon.com/AmazonS3/latest/dev/example-bucket-policies.html#example-bucket-policies-use-case-4

The requested URL can't be reached - MuleSoft Mock Service Error

Error encountered while accessing Mock Service

The requested URL can't be reached

The service might be temporarily down or it may have moved permanently to a new web address.

for details refer 

https://docs.mulesoft.com/api-manager/v/1.x/accessing-your-api-behind-a-firewall

For testing purpose as quick fix "Bypass the proxy". Select option next to "Mock Service" stating " API is behind a firewall"

Actual fix before you implement it in Test/Production environment  is to  implement and apply a CORS Policy for your browser to be able to load the resources in the API behind your firewall and the Anypoint Platform’s browser tools

https://docs.mulesoft.com/api-manager/v/1.x/cors-policy

Another Perspective about using Queue / Topics - Good Read

Queues, think before you use it

https://blogs.mulesoft.com/dev/connectivity-dev/why-messaging-queues-suck/

Cloud vs On-Prem

5 min narrative on difference between Cloud vs OnPrem
https://www.youtube.com/watch?v=Ri39--x1d24&t=21s

Setting VPC as default VPC in AWS

Not a new question and i have been asked about it multiple times in past 2 years. How can i set VPC as "default VPC"

and answers is...

 

You cannot at this time using console/CLI/ API. If it is must contact AWS support. 

Mechanical Sympathy - Learning from Racing

Formula 1 world champion once stated

“You don’t have to be an engineer to be a racing driver, but you do have to have Mechanical Sympathy.” 
– Jackie Stewart, racing driver


This fits so well with technology. What Jackie meant is that understanding how a car works make you a better driver. This is so much true for writing code mainly in today's cloud technology. You need to have a basic understanding of hardware to create a good software.

Unable to connect IIS Express - Visual Studio 2017

 Delete your web application’s .vs\applicationhost.config and try rebuilding the application and launching.

.vs is a hidden folder under your solution's folder.

The specified framework 'Microsoft.NETCore.App', version '1.0.0' was not found

Error white running EF framework command

Resolution
Install latest .NET Core SDK

https://github.com/dotnet/core/blob/master/release-notes/download-archives/1.1.2-download.md

AWS vs Azure Pricing

Handy Tool for estimating the price of services offered by AWS / Azure

AWS
https://calculator.s3.amazonaws.com/index.html  - Simple Monthly calculator
https://aws.amazon.com/tco-calculator/    - TCO Calculator


Azure
https://azure.microsoft.com/en-us/pricing/calculator/

Azure vs AWS

Not a surprising question by all the Cloud savvy peers!

Simple comparison data published here

https://docs.microsoft.com/en-us/azure/architecture/aws-professional/services

Do check out the link 

https://docs.microsoft.com/en-us/azure/architecture/aws-professional/

Unable to connect - Azure Hybrid Connections

After you have configured the Azure App Service Hybrid connection, you might have a scenario when the Status of showing up as "Not Connected"

Azure Portal - > App Service -> Select App - > Networking - >Configure Hybrid connections

"Status : Not Connected"











One way to get more information on the issue is to run a get-hybridconnection powershell command in On-Prem client machine

In this case server was not connected to the internet. The server was placed in private subnet with no NAT gateway connectivity to internet. Once the server was connected to internet , issue was resolved.

.NET Core vs .NET Framework

 .NET Core vs .NET  Framework

ARN AWS - What is it and how can i make one for a resource?

If you are into AWS coding and access AWS resources , assign policy to user in AWS  pragmatically than you will be working with ARN a lot

The below 2 links are very handy to work with ARN

What is ARN 

How to define one?

Instance does not have a volume attached at root (/dev/sda1)

Error :Instance does not have a volume attached at root (/dev/sda1) 

The error occurs when either a boot volume is missing or mapped to wrong device name. In this case EC2 instance is expecting the boot device name /dev/sda1 to be connected to the EC2 instance and unable to find it

The step is valid for EC2 instances is backed by EBS volumes i.e EBS is used for boot volumes rather than Instance Store

Note: To Understand more about Instance backed store and EBS backed store
refer this article Amazon EC2 Root Device Volume




To attach a root volume follow these steps.

• Create   a new EBS Volume. Click on Volumes when in EC2 Instance page

• Once EBS volume is created , right click and select Attach Volume

• Select the EC2 instance in second textbox and enter the device name as "/dev/sda1"

• Click Attach and restart the EC2 instance 

 Do leave comment if the solution works and even if it doesn't work . Thanks!

node -v ReferenceError: node is not defined

Trying to make node.js work with command node -v and end up with an error 

node -v ReferenceError: node is not defined 

You are probably trying to run the command in REPL  virtual environment

In order to check node.js version go to the folder with node.js files and run command from command prompt 

About REPL 

REPL ( Read- Eval-Print -Loop) is an virtual environment that comes with Node.js. It is tool to test simple Node.js javascript code. 

Learn more here about REPL

AWS Costing

If you ask any AWS geek , what is the biggest change they have noticed after moving On-Prem workloads to Cloud, you will mostly hear typical well known answers "better management" , "Less Operations overhead "...so on ..

One important trait which they aquire but will not acknowledge as they are not aware either is acquiring  a  "Mulah mindset" . [ for those who are wondering what mulah is, let me make it simple. mulah ~ money"]

Be an  Architect , IT manager, Developer one thing you need to be good at when working with AWS is costing. I know its hard , never had to deal with costing before so frequently  as old school style only involved painful money discussion during the budget cycle  when capital investment needs to be budgeted during initial stages of planning. 

Good part is, you don't need to have a Phd to understand costing but do need to spend some effort to get used to calculation. [ Paradigm shift is good thing]

AWS provides some good tools and lots of information to make life easier . Below are some useful links

Simple Monthly Calculator 

AWS TCO  

AWS Free Tier 

AWS Elastic Beanstalk vs AWS CloudFormation

One question , i get in most of sessions when talking about Elastic Beanstalk is
"difference between Elastic beanstalk and CloudFormation"

I would like to keep this explanation very simple.

Use  Elastic Beanstalk when you want to deploy the application from supported developer tool and don't want to worry about provision of infrastructure prior to deployment. Elastic beanstalk framework will provision the infrastructure and deploy the code to servers.

Use CloudFormation  when you want a framework to define collection of related AWS resources and provision them in an orderly and predictable fashion


Important to Note 

AWS CloudFormation supports Elastic Beanstalk application environments as one of the AWS resource types


Detailed Information :

CloudFront 

Elastic Beanstalk

DIY vs AWS

Came across a very good , simple to understand comparison between AWS and DIY (Do-It Yourself)

DIY	AWS
Scale Up	Elastic Service(On-Demand/ When needed)
Assume Reliable Infrastructure	Assume Infrastructure Failure
Diverse Technical Expertise	Application Based Expertise
Application Unaware of Infrastructure	Application aware infrastructure
High Upfront Cost	Usage Based Cost
Design, Build, Operate	Limited Knowledge/ Shared Support
Showback , charge back challenging	Showback , Chargeback can be achieved by granular monitoring of usage

AWS vs Azure

Age old question .....

Check this comparison matrix

https://azure.microsoft.com/en-us/campaigns/azure-vs-aws/mapping/