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Is there a difference between services available in a private cloud and those available in a public cloud?

 

Editor's note: This article is excerpted from chapter 5 of IBM Cloud Platform Primer.

 

A key distinction between Infrastructure as a Service (IaaS) and Platform as a Service (PaaS) is the type of service offered by each segment. With IaaS, consumers usually work with virtualized servers, which they can configure themselves, whereas with PaaS, the consumer uses and works with services that are created and maintained by the cloud service provider. Figure 1 captures the basic differences between IaaS and PaaS.

 

121415Iyengarcloudexcerpt1-fig1

Figure 5.1: Difference between IaaS and PaaS

 

When PaaS is discussed, it is often construed to be in the private cloud domain. But in fact these services are increasingly available on public clouds. Is there a difference between services available in a private cloud and those available in a public cloud? From a cloud-service consumer perspective, it shouldn’t matter, although if the consumer is an enterprise client, questions of security and workload isolation come up. But from the cloud-service provider perspective, many things need to be addressed.

 

Recently, we’ve been hearing a lot about public PaaS platforms such as Heroku, Bluemix, and Azure. They all run on some infrastructure, the services for which are provided by hosting providers such as Rackspace, SoftLayer, and Amazon Web Services. This chapter touches upon IaaS, using IBM’s SoftLayer to explain the concepts. References to other products illustrate the fact that there is quite a bit of commonality between cloud hosting providers.

 

Characteristics of a Public Cloud

In its broadest definition, a public cloud is a set of computing resources set up based upon a cloud computing model in which a service provider makes resources publicly available over the Internet. There are basically three types of resources—compute, storage, and network—which may be offered free on a trial basis, for a fixed monthly fee, or on a pay-as-you-go model. IaaS providers host hardware, middleware, servers, storage, and other infrastructure components for their users. IaaS providers can also host users’ applications and handle tasks such as system maintenance and backup. In addition to the three cloud service models, NIST has defined four deployment models, shown in Figure 2. These deployment models are classified according to where the service is running and what kind of access is provided.

 

121415Iyengarcloudexcerpt1-fig2

Figure 5.2: Cloud deployment models

 

Enterprises have security concerns, which I discuss in a later section. Notwithstanding those concerns, the many benefits to public cloud computing include

  • All resources are readily available for clients to start quick deployments.
  • Clients pay only for resources that are consumed.
  • Resources can be rapidly scaled based on need.
  • All services are delivered in a consistent manner.

Figure 3 shows a cloud network topology. It depicts the cloud environment as accessible from the Internet over a public or external network. The routing switch, or cloud gateway, uses the internal network to communicate with cloud resources. These resources, which can be virtual machines or bare-metal servers, are accessible via various ports within the cloud. If one were to add more details to this figure, one could show the cloud load balancers, which route traffic to different instances in the cloud; caching instances; database instances; and other cloud block storage components.

 

121415Iyengarcloudexcerpt1-fig3

Figure 5.3: Public cloud network topology

 

Cloud service models are also defined by the ownership and degree of customization allowed, which translate into cost, control, and elasticity. Those metrics determine whether the cloud services are fully managed or unmanaged and how much can be done in-house versus what can be outsourced.

 

Managed vs. Unmanaged Services

Cloud services typically come in one of two forms: managed and unmanaged. Managed services offer support for every task and problem related to the resources hosted by the provider. With unmanaged services, the provider will replace failed hardware components but does not support software installations or patch upgrades. Some cloud providers offer both managed services and unmanaged services, but with support for backup and restore services.

 

An enterprise’s in-house expertise, consumption appetite, and costs will dictate which option it chooses. While some clients choose unmanaged servers, apply their own security configuration, and use the servers for rapidly deploying development and test environments, others may have a fully managed infrastructure for rolling out their production topology. Table 5.1 lists some of the features of both managed and unmanaged services.

 

 

Managed Services

Unmanaged Services

Operating system deployment and management

Operating system deployment

Client is given controlled access to operating system

Client is given complete control over operating system

Monitoring and notification

Unrestricted access to servers and any software the client needs installed

Maintenance and routine patching

Initially cheaper to sign up because there is no management or maintenance support

Backup and restore services

Client is responsible for backing up components

Disaster recovery and storage services

Client is responsible for storage and recovery

Security services

Client is responsible for installing security patches

OS-based service-level agreements

Hypervisor-only or infrastructure-only service-level agreements

Table 5.1: Managed versus unmanaged cloud services

 

Unmanaged servers are less expensive and give you greater freedom to control your servers, whereas managed servers mandate the use of certain processes and tools for control. With unmanaged servers, one also inherits the risks of misconfigurations and the responsibility of dealing with application failures. Managed cloud services usually come with a more long-term agreement between the cloud service consumer and the cloud service provider. So, while both types of services have their advantages and disadvantages, the key is to understand your own organization’s skill set and needs and choose appropriately.

 

Note: As a common practice, enterprises tend to opt for managed services for their production environments and choose unmanaged services for non-production environments.

 

Workload Isolation and Security

Workload isolation involves placing workloads in the cloud such that the resources they use do not adversely affect other applications running in the same cloud. In contrast, security deals with keeping applications, especially the data, private and secure from other applications in the cloud.

 

In addition to providing workload security, cloud service providers are often faced with demonstrating workload isolation. While workloads might share common pools of resources under normal circumstances, they need to be isolated from each other so that problems in one workload do not affect other workloads. Similarly, sensitive data in one workload should not be visible in any shape or form to other workloads. Isolated workloads each get their own set of dedicated resources.

 

Other levels of isolation include network isolation, isolation of management networks, data network isolation, and isolation of IP storage networks. Isolation can be physical or logical. Physical segmentation of networks, allowing only authorized administrators access to networks, and using non-routable networks are some of the ways of keeping each client’s environment separate from other clients’ environments. While cloud service providers strive to provide these various levels of isolation, the inherent isolation provided by cloud containers is one of the main reasons that the use of container technology is increasing. I discuss containers later in this chapter.

 

Note: Physical isolation means the resources are running on separate hardware. Logical isolation uses hardware-management software to make a single set of hardware work like multiple, separate sets of hardware.

 

In a private cloud platform such as the PureApplication System, workload isolation is facilitated through cloud groups and smart placement algorithms. Cloud groups contain compute nodes and a reference locator, such as an IP group. Thus a cloud group has all the components needed to run virtual machines, as shown in Figure 4.

 

121415Iyengarcloudexcerpt1-fig4

Figure 5.4: A cloud group in PureApplication System

 

Placement of the virtual machine instance is crucial to achieving workload isolation. When placing a new VM instance, the placement algorithm in PureApplication System selects the compute node based on effective capacity. Resources such as CPU, memory, data network bandwidth, and storage network bandwidth are used in the placement calculation. For more information about workload isolation in PureApplication System, see www.ibm.com/developerworks/cloud/library/cl-ps-aim1302-workisolation/.

 

In the public cloud, workload isolation is provided by the underlying cloud infrastructure. Along with placement constraints, a combination of networking and security technologies is used to isolate traffic.

 

You’ve likely heard it said that you should not trust a cloud service provider to protect your corporate assets. Indeed, security has become the most common inhibitor for enterprises that would like to adopt cloud computing, and rightfully so. Two facets of security—threats and compliance—dictate access controls. On one hand, enterprises are forced to address a growing number of mandates, including national regulations, local mandates, and industry standards. On the other hand, enterprises have to shield themselves from threats both external and internal. Enterprises must be constantly vigilant against threats ranging from cyber attacks and corporate espionage to disgruntled employee actions and careless internal breaches.

 

Even though many of the security concerns are not new, to gain the trust of organizations, cloud service providers must meet or exceed the security and privacy that’s available in traditional IT. Additionally, sensitive data such as credit card information stored on-premises should always be encrypted. Some cloud service providers offer encryption services within their cloud-based storage. Many third-party security products, such as CipherCloud and SecureCloud, monitor the data that’s stored in the cloud and prevent malicious data from penetrating the client’s system. A website being hosted in the cloud can use website protection services.

 

Once cloud security requirements are understood, we can use the Cloud Computing Reference Architecture with foundational security controls when designing, deploying, and consuming cloud services. The controls around security are

  • cloud governance
  • risk management and compliance
  • security incident management
  • identity and access management
  • discovery, categorization, and protection of data and information assets
  • virtual systems acquisition, development, and maintenance
  • management of threats and vulnerabilities
  • physical and personnel security

The need for privacy and security is why many enterprises start with a private or on-premises cloud that has such security controls. Once an enterprise has processes in place to protect virtualized environments from outside attacks, it can move into hybrid and public cloud solutions.

 

Virtualization is fundamental to cloud computing. But the proliferation of virtual images raises the risk of malicious attacks and exploitation of security flaws. Remember, the hypervisor is the traffic cop that controls multiple images of various resources. The hypervisor relies on the underlying operating system to manage and protect the applications and interfaces. It all boils down to protecting the integrity of customer data and ensuring a good customer experience. End users and customers are mainly concerned about the quality of service within a secure environment.

 

Note: From data breaches to shared technology vulnerabilities, the Cloud Security Alliance’s Top Threats Working Group has identified the top nine cloud computing threats, which it calls The Notorious Nine. You can download the report at cloudsecurityalliance.org/download/the-notorious-nine-cloud-computing-top-threats-in-2013/.

 

Editor's note: To find out more, read IBM Cloud Platform Primer.

Ashok Iyengar

Ashok K. Iyengar (ashoki@us.ibm.com) is an executive IT specialist at IBM, based in San Diego. He has worked in the IT industry for more than 30 years. He holds an MS degree in computer science from North Dakota State University, Fargo. In his spare time, Ashok loves to write. Among his works are IBM Cloud Platform Primer, IBM WebSphere Portal Primer, and WebSphere Business Integration Primer. For the past several years, Ashok has worked on cloud-based projects, doing proofs-of-concept, pilots, architecture design, and implementations. 


MC Press books written by Ashok Iyengar available now on the MC Press Bookstore.

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    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.

     

     

  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

     

     

     

  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.

     

  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.