I have moved this blog to my very own WordPress site --> https://maheshkumar.wordpress.com

Pls continue to read it from there.

Thank you !!! 

RAID devices are virtual devices created from two or more real block devices. This allows multiple devices (typically disk drives or partitions thereof) to be combined into a single device to hold (for example) a single filesystem. Some RAID levels include redundancy and so can survive some degree of device failure.

$ cat /proc/partitions $ fdisk -l { list the partition tables for the device, if no device specified then list all the partitions from the system } $ fdisk /dev/sdc -n create a new partitions { size as +1G } -m {help} -t :L {enter "fd" for Linux raid auto} -w { write the entries to persist } $ partprobe { inform the OS partition table changes } $ vim /etc/fstab { before we proceed, let’s verify the disks are not used for any mounting. In my case, I had used as swap device mounting so got an error saying device is busy error. Rmv the entry, reboot } $ mdadm --create /dev/md1 -l 5 -x 1 --raid-disk=3 /dev/sdc1 /dev/sdc2 /dev/sdc3 /dev/sdc4 --verbose --auto=yes $ mdadm --detail /dev/md1 { list details after creation, should see 3 device + 1 spare device } $ mdadm --fail dev/md1 /dev/sdc1 { to simulate the failure } $ mdadm --remove /dev/md1 /dev/sdc1 { remove the faulty one } $ mdadm --add /dev/md1 /dev/sdc1 { add the device back to the pool as spare device if healthy }

Client-Server Revolution → Systems of records It was the client-server revolution that first enabled broad use of information technology to manage business. Organizations first built systems of records: Customer Relationship Management (CRM) systems; Human Capital Management (HCM) systems for HR; and Enterprise Resource Planning (ERP) systems for financials and key assets. Internet Revolution → System of engagement The rise of the internet, mobile, and chat allowed us to create systems of engagement that interfaced between the systems of records and interacted directly with customers and suppliers. AI Revolution → System of intelligence What is emerging now are systems of intelligence that integrate data across all systems of record, connect directly to systems of engagement, and build systems that understand and reason with the data. These systems can drive workflows and management processes, optimize operations, and drive intelligent interactions with customers, employees, suppliers, and stakeholders.

1. Azure AI -> A page where our Microsoft AI story is well articulated (In the page, scroll down for ‘AI Services’).
2. Intelligent KIOSK –> must try windows app to demonstrate Pre-built AI (Cognitive APIs) & store url
3. Seeing AI –> Great demo app on iOS using our cognitive APIs. Good to install and check the capability it brings in
4. Conference Buddy –> ingredients needed to develop an intelligent chatbot. sample code for try one.
5. Microsoft AI School –> Another great learning resource our Services and ML offerings
6. The JFK Files –> Cognitive Search - An AI-first approach to content understanding – code

Aug 31, Our CycleCloud team hits general availability in Azure. It's a tool for creating, managing, operating, and optimizing HPC clusters of any scale in Azure.Azure CycleCloud is available in the Microsoft Download Center, Azure Marketplace, and Azure Container Registry,
• Azure CycleCloud announcement
• Azure CycleCloud product page
• Documentation
• Azure CycleCloud download
• Azure Marketplace offering for Azure CycleCloud
• Azure Container Registry container

The following key scenarios are met by CycleCloud:
• Ability to run Linux & Windows HPC Clusters with traditional schedulers, including Slurm, PBS Pro, HPC Pack, Spectrum LSF and Symphony, Grid Engine, or HTCondor.
• Easily managing HPC clusters with multiple VM families and sizes to get capacity for critical runs
• Customizable workload templates that serve as best-practice starting points for Azure deployments
• Active directory integration for access to and management of compute environments

$ ssh -J cycleadmin@{JUMPBOX PUBLIC HOSTNAME} cycleadmin@cycleserver -i {SSH PRIVATE KEY}

[root@cycleserver ~]$ cyclecloud connect master –c <clustername>

$ az login

$ az account list -o table

Step 1: I am using WSL but you can try Git Bash or bitvise or Putty or Tux vm or any other SSH client of your choice.

Pls note down the Key passphrase safely. This is required when we SSH to Linux VM from $ terminal.

Step 2: You would see the public and private keys generated at the path ~/.ssh. Cat out the id_rsa.pub file to grab the public key which is required when creating Azure Linux VM.

Step 3: Paste the above Public key at the time of VM creation in portal or CLI

Step 4: Once the VM is created, copy the SSH command to logon

Step 5: Go back to the your favorite SSH client and run the above copied command. Pls note, it will prompt for the passphrase which you have to enter now. On success, you would see your remote machine terminal.

Let me know if you see this helps you in some way.

Happy learning !]]> https://docs.microsoft.com/archive/blogs/maheshk/why-azure-paas Thu, 18 Jan 2018 22:09:00 GMT https://blogs.msdn.microsoft.com/maheshk/?p=2715 Happy new year ! As a Technical Evangelist, I work with bunch of ISV's where I meet technical architects for engagements which includes Architectural design talk, review or POC's assistance. To me, its easy to work with and explain Uber architects vs PowerPoint architects who resist PaaS services aggressively and often describe it's a burden for them. As a leader in PaaS offerings, we encourages developers/startups to focus on their “apps” rather spending time on managing the underlying resources. It gives us a “real” freedom to operate cloud easily and also provide easy integration happy path to various tools, reports and monitoring. Here I wanted to list out the advantages of adapting PaaS Service over IaaS.

1) Open and Hybrid: Azure is committed to being open and speak customer languages of their choice and platforms they prefer. We openly work with many open source communities, integrating the demands, acknowledging the development community movement and also contribute the same fix back to the community repos. By this way, It put us on a win/win situation. Hybrid path and options in Azure is so useful for someone to leverage their existing on Premise investments. Azure PaaS provides high control, high productivity + Intelligence platform which you can consider for both Open source and Hybrid scenario’s.

2) Data-driven Intelligence: Azure is the "only" cloud provider which provides comprehensive monitoring solutions to monitor both Cloud and On- Premises in a single pane. It has Azure Monitor, Application Insights, Log Insights etc helps to get various intelligence about the services easily. It also has the Azure Security Centre to helps us easily detect threats early and avoid false positives.

3) Continuous Innovation: Azure services can be easily integrated with VSTS which provides an end to end DevOps having planning, build & release and required tools. Azure Cognitive and AI services is way ahead of other providers. In fact, Azure provides 29 API's for Cognitive Service which is a true value proposition and also a sign of Innovation.

4) Cross Platform: Using VS tools for Xamarin, developers can build native Android, iOS and windows apps sharing 90% of the code across device platforms. Non developers can also build scalable applications for desktop and mobile on top of cloud & On Premise services using PowerApps (no coding skills required).

5) Productivity & Tools: Azure offers unparalleled developer productivity tools for PaaS Development with Visual Studio through which one can even step into remote codes in few mins(remote debugging). 

Do you still believe as a burden?

#StayLearning..

I started as a Newbie to Linux, today having a considerable knowledge on Linux environment but still struggling to use the right switch key at first shot. Very important thing is, we keep forgetting the commands if there is no continuity in preparation especially when not using Linux as primary OS for day work.

One thing I learned during this time period is, “there is always more than one way to do things in Linux”.  That’s the spirit keep motivated me to go strong for the exam. My learning started with deploying 1) Azure Linux VM prepared for RDP, then 2) dedicated laptop installed using bootable USB (thanks to Rufus), 3) then formatted ubuntu and installed Centos to get a feel 4) Again back to Ubuntu

[embed]https://twitter.com/MahesKBlr/status/779008726908833792[/embed]

5) then Redhat machine in Azure 6) then tried bash on windows (WSL), 7) tried Hyper-V manager to have Ubuntu and Centos but finally heavily using Azure Ubuntu Linux for giving my exam. After all this trial and error, now I can talk about the variants , understand any command and its purpose, can write a small bash script for a cron job, manage system services, install the missing pieces and prepare a machine etc.

[embed]https://twitter.com/MahesKBlr/status/917053415502397441[/embed]

Now, coming back to the topic, It is not always easy to remember and recollect the Linux commands with various switches. It needs a lot of practice and continuous hands on to get memorized otherwise we will be managing with 10-15 commands with lots of trial and error. Now, I love my terminal windows than Linux IDE. I stopped spending time installing GUI or RDPing, I manage to live with only commands for anything. It forced me to think through deep enough and also gives me a various flavor to choose from. Here today, I would like to leave with these 3 Linux tools which would help us any day to get the right commands to use. Later we can deep dive man pages for switches.

tool #1:- Fish is an awesome tool help us to get an autocomplete for the entered command with all possible options. It actually takes to the fish shell, where we need to enter the partially broken commands to get variants.

tool #2:- History command is the one which most frequently use to recollect the command switches. I highly recommend making use of this when we copy paste certain commands from net for the first time to make it work then later we forget the steps we arrived.

tool #3:- Apropos, this one is a personal favorite. When I doubt, run apropos command to get all the possible nearest commands. Many times we know there will be a command way to manage database say mysql but won’t know the full command in hand to try. This command fills the gap by providing all the list containing the search keyword.

Few other useful commands for productivity, (1) tmux

[embed]https://twitter.com/MahesKBlr/status/907280156380692480[/embed]

(2) apt-cache search <pckg name> (3) sysctl (4) find (5) grep (6.) tree (7) watch elinks (8.) ps (9) top/htop (10) tar.

Let me know your favorite ones .