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PaaS - the Operating System of the Cloud

1/3/2014

17 Comments

 
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The venerable operating system has been around almost as long as the computer has been in existence. Though the "computer" has changed - from mainframes to PCs and now to mobile devices and tablets - the role of its operating system is largely similar. The OS abstracts the underlying hardware and provides applications access to those hardware services. These services typically include file system access, network access, graphics and sound, and of course memory and compute. These are accessed via APIs provided by the OS.


Cloud provides a new way of writing software, and with it, new tools have emerged that make it easier to write that software. One of the newest ones on the block is the Platform as a Service or PaaS. Vendors of PaaS include Microsoft's Azure, Salesforce's Heroku, Cloud Foundry, and to some degree Amazon's AWS. What is a PaaS? PaaS is the operating system for the cloud. Like a computer OS, a PaaS provides a set of APIs which applications can access to make their lives easier. Whereas a computer OS provides access to the services of a single computer, a PaaS provides access to the services of many, spread across many data centers. Whereas a computer OS provides a software API bound to specific languages, a PaaS provides access to services over a network that is bound to specific on-the-wire protocols - typically REST. 

And just what are these services? Though they vary from provider to provider, these are the five core services which I view as foundational to PaaS:

  1. Deployment Automation: The PaaS provides a way to take your code - for example your Java application - and then get it deployed across a number of machines in different data centers in a completely automated fashion. In Heroku, this is done with a git push. Heroku monitors your repo and once you push an update, it extracts it, distributes it to the various machines that will run your code, makes sure the JVM is up and running, and starts your app. Contrast this with AWS (which does not provide this capability). On AWS you can spin up a VM, but they its your job to get your code onto the VMs, make sure the JVM is there, and so on. A PaaS does all of that for you.
  2. HTTP Request Routing: PaaS is really tuned around web services. The PaaS will provide its own HTTP reverse proxy, handle DNS configuration, TLS termination, and make sure requests for an HTTP URI are routed to a running instance of your code. As a developer, you no longer need to worry about any of that. Just write your web app, and the platform will get the queries to a running server. 
  3. Scale and HA: If you write your app in the right way - namely, using stateless web services that store all persistent state in a shared backend database - the platform can provide scale and high availability. It can turn up as many instances of your app as is needed to handle the incoming request load. It can handle failed machines or server instances, and restart them for you. If a DC fails, through DNS it will route traffic to a backup DC to running instances of your code that are there. The trick to making this magic work is writing your app correctly and doing a good job on your database selection and schema design.
  4. Data Storage: The PaaS will also provide databases as a service. This means there are databases up and running that you can access via some kind of protocol interface. This might be RESTful access (as in the case of Amazon S3 or Azure storage services), SQL queries for a relational database, or whatever the query protocol is for a noSQL database. As an application developer, you do not need to set up, run, or configure this database. The PaaS provides it for you. 
  5. Application Upgrade/Downgrade: A cloud service needs to always be available. If you want to upgrade your cloud software, you cannot take everything down and do the upgrade. A PaaS will typically provide some kind of rolling upgrade capability, where you can install a new version, test it while the old is still running, and once everything looks good, do a cutover to the new service instance. And then if things fail, you can roll back. 

In addition to these core five, the PaaS can provide other services:

  1. Logging - log collection, storage, and analysis tools
  2. Developer tools - integration with developer tools (e.g., Azure provides integration in Microsoft Developer Studio)
  3. Monitoring services
  4. Metrics and dashboards
  5. Message bus services
  6. And more.


All of this used to be the stuff that made writing server side software hard. With PaaS, these hard problems are solved for you and you can focus your energy on the business logic of the app itself.

PaaS is the operating system of the cloud, and it is the future of how server side software will be built. The race is now on - who will be the leaders in providing PaaS services? Like operating systems, apps are "sticky" to their particular platform and require porting to go from platform to platform. As the set of APIs and services for PaaS's grow, the choice of PaaS becomes more crucial as the costs of porting go up. This is one of the benefits of open source PaaS offerings like Cloud Foundry - instead of being wed to the APIs of a particular vendor, the APIs are defined by a community and can be improved by contribution.

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PaaS include Microsoft's Azure, Salesforce's Heroku, Cloud Foundry, and to some degree Amazon's AWS.

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Rent a Car for Lease in Pakistan: A Comprehensive Guide

Introduction

Leasing a car in Pakistan is becoming an increasingly popular option for businesses, professionals, and individuals who require long-term vehicle solutions without the burden of full ownership. Whether you need a car for corporate use, daily commuting, or commercial purposes, leasing offers flexibility, affordability, and convenience.

In this guide, we will explore everything you need to know about renting a car for lease in Pakistan, including the benefits, top leasing companies, types of vehicles available, pricing, and key considerations before signing a lease agreement.

Why Lease a Car in Pakistan?

Leasing a car in Pakistan comes with numerous advantages, including:

Cost-Effective: Leasing is often more affordable than purchasing a car outright, especially for businesses requiring multiple vehicles.

No Depreciation Worries: You don’t have to worry about the resale value or depreciation of the car.

Maintenance and Repairs: Many leasing agreements include maintenance and service costs, reducing extra expenses.

Flexible Terms: Lease agreements can range from a few months to several years, depending on your requirements.

Latest Car Models: Access to newer car models without committing to a long-term investment.

Best Car Leasing Companies in Pakistan

Several companies in Pakistan offer car leasing services tailored to personal and business needs. Here are some of the top providers:

1. Pak Car Lease

Offers flexible leasing options for individuals and businesses with competitive rates and a wide range of vehicles.

2. Toyota Sure Lease

A trusted leasing service from Toyota, providing brand-new and certified used Toyota vehicles with installment plans.

3. Bank Leasing Services

Many banks in Pakistan, such as Meezan Bank, HBL, and UBL, offer car leasing with easy monthly installment plans.

4. Avis Pakistan

A globally recognized car rental and leasing company offering both short- and long-term lease options.

5. Metro Car Lease

A reliable local leasing company providing vehicles for corporate, commercial, and personal use.

Types of Cars Available for Lease

Car leasing services in Pakistan offer a wide variety of vehicles, including:

Economy Cars: Suzuki Alto, Suzuki WagonR, Toyota Vitz – Ideal for personal and small business use.

Sedans: Toyota Corolla, Honda Civic – Suitable for corporate executives and professionals.

SUVs & 4x4s: Toyota Prado, Honda BR-V – Perfect for off-road and high-end business use.

Luxury Cars: Mercedes-Benz, BMW – Best for VIP and corporate leasing.

Vans & Commercial Vehicles: Toyota Hiace, Suzuki Bolan – Ideal for group transport and commercial purposes.

Pricing & Lease Terms

The cost of leasing a car in Pakistan depends on several factors, such as the type of vehicle, lease duration, and additional services. Below is an estimated price range:

Economy Cars: PKR 25,000 – 50,000 per month

Sedans: PKR 50,000 – 100,000 per month

SUVs & 4x4s: PKR 100,000 – 250,000 per month

Luxury Cars: PKR 200,000 – 500,000 per month

Vans & Commercial Vehicles: PKR 50,000 – 150,000 per month

Lease terms usually range from 6 months to 5 years, depending on the agreement. Some leasing companies offer installment-based leasing, allowing customers to own the car after the lease term ends.

Corporate Car Leasing

Businesses in Pakistan frequently lease cars for their employees, executives, and operational needs. Benefits of corporate car leasing include:

Fleet Management Services: Companies can lease multiple vehicles at discounted rates.

Tax Benefits: Leasing expenses can be claimed as business expenses.

Brand Reputation: Luxury and well-maintained vehicles enhance the company’s image.

Employee Convenience: Providing leased cars boosts employee satisfaction and productivity.

Popular Corporate Leasing Plans:

Short-Term Lease: Suitable for project-based assignments and temporary business requirements.

Long-Term Lease: Ideal for organizations requiring vehicles for years with maintenance coverage.

Customized Fleet Leasing: Businesses can choose specific vehicle types based on operational needs.

Self-Drive vs Chauffeur-Driven Lease Options

Car leasing services in Pakistan typically offer two options:

1. Self-Drive Lease

Requires a valid driver’s license and security deposit.

Preferred by businesses and individuals who frequently travel.

Offers complete privacy and control over the vehicle.

2. Chauffeur-Driven Lease

Includes a professional driver with the leased vehicle.

Ideal for business executives, VIPs, and corporate teams.

Costs more but provides added comfort and convenience.

Key Considerations Before Leasing a Car

Before signing a lease agreement, it’s crucial to consider the following factors:

1. Verify the Leasing Company

Research the company’s reputation and read customer reviews.

Ensure the co

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    CTO & Head of AI, FIve9

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jdrosen.net was last updated 2/7/17
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