|Exam Name||:||Data Protector 5.1 Basics for UNIX|
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|Updated On||:||February 20, 2019|
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SAN FRANCISCO—VMware is nonetheless the big kahuna in virtualization, and the company is internet hosting its annual VMworld convention this week to show off the latest brilliant bits of software that agencies can purchase for their facts facilities. we'll be covering the event in San Francisco to hold you up to date.
details on the VMware public cloud carrier that will compete in opposition t Amazon may be in the offing. whereas servers and cloud computing will dominate the agenda these days, updates on end consumer computing (perhaps including twin-persona phones) will come the next day. For now, we can talk in regards to the new products VMware turned into willing to exhibit in increase of the display.NSX
along with a brand new edition of its core vSphere virtualization platform, VMware is unveiling new software to virtualize networks and storage. All of those equipment, when mixed with the imminent public cloud carrier, will support VMware stay aggressive in opposition t the likes of Microsoft, red Hat, and the open supply OpenStack cloud infrastructure-as-a-carrier platform.
today, the business is saying VMware NSX, network virtualization software designed to "carry the total networking and protection model from Layer2 to Layer 7 in application, decoupled from underlying networking hardware," in VMware's words. it's now not precisely a brand new product—it combines VMware's existing vCloud and network security (vCNS) equipment with the expertise of Nicira, which VMware purchased a year ago.
The core constituents of NSX include logical switches and routers along with a RESTful API for integration into third-birthday party cloud administration systems, plus a logical firewall, load balancer, and VPN.
"The platform is constructed round a controller cluster that manages the distribution of logical network functions into hypervisors right through the records middle," VMware mentioned. "The NSX platform grants the base Layer 2 and Layer three network virtualization with add-on utility modules for selected Layer four-7 community functions, comparable to firewall, load balancer and VPN."
while NSX integrates with vSphere and the vCloud Director and Automation middle management equipment, it additionally works with hypervisors and administration software past VMware's. That contains the Xen Server and KVM hypervisors and the OpenStack and CloudStack cloud administration platforms.
NSX may be attainable in this fall 2013 for a price that has no longer yet been introduced. but the primary networking add-ons that VMware already presents are available mostly vSphere platform, which VMware consumers usually own.
"The vCloud Networking and security that are already within the core vSphere platform will continue to be there at least for now," Gartner virtualization analyst Chris Wolf advised Ars by means of electronic mail. "I are expecting purchasers that simply need basic network virtualization elements to stick with vCNS." vCNS comprises a digital firewall, VPN, and load balancing.massive, virtual statistics
beyond networking, VMware is virtualizing storage—and not for the primary time. vSphere already has a virtual storage platform, but VMware mentioned it's going to deliver whatever thing more suitable within the sort of virtual SAN (vSAN). This lets IT shops "straight provision VM storage the use of basic policies" and scale storage skill and efficiency up automatically as a cluster of digital servers grows.
"vSAN is a large deal," Wolf pointed out. "With vSAN, shoppers can pool native storage on servers and create a storage community without wanting any traditional SAN hardware—just servers and local disks. here's a large component for enabling the application-described information center, and over the future, vSAN can aid groups cut back their reliance on hardware-primarily based storage solutions. We predict clients to start the usage of vSAN in dev/look at various environments as a method to reduce fees and potentially expand vSAN deployments to VDI [virtual desktop infrastructure] workloads as smartly."
One large change between vSAN and VMware's old storage utility is that "which you can use native storage and still be in a position to take competencies of are living migration [the ability to move virtual servers from one physical machine to another with no downtime] and excessive availability," Wolf spoke of. "in the past, agencies would want a 3rd celebration product just like the HP Lefthand VSA to do it. also, vSAN storage is replicated and enormously purchasable. So if a server fails you might not lose any records."
vSAN is heading into a public beta, and widely wide-spread availability is deliberate for the primary half of 2014.
As for the core virtualization platform, VMware is unveiling vSphere with Operations management version 5.5. A vSphere example can now manage 320 physical CPUs, up from a hundred and sixty in vSphere 5.1. memory guide changed into doubled to 4TB, and support for virtual CPUs doubles to 4,096. The optimum size of a VMDK (virtual desktop disk) has dramatically risen from 2TB to 62TB.
past the numbers, some new points make it more straightforward to set up definite purposes and improve from failure. vSphere is now better in a position to handle the wants of applications requiring low latency, reminiscent of in-reminiscence databases, VMware said. additionally, a new "Flash examine Cache" virtualizes server-aspect flash storage to provide a "excessive performance examine cache later that dramatically lowers utility latency."
a new high availability characteristic places an agent interior a virtual laptop to monitor the traffic and endeavor of the utility running inner. When anything irregular happens, the VM may also be immediately rebooted or a notification can also be despatched to an administrator. up to now, VMware high availability utility would now not always recognise an utility was misbehaving if the virtual computer itself appeared high-quality, VMware product advertising govt Peter Wei instructed Ars.
every other improvements to vSphere 5.1:
New vSphere large statistics Extensions: With the new vSphere huge records Extensions, purchasers can run Apache Hadoop workloads on vSphere to achieve larger utilization, reliability, and agility. vSphere huge information Extensions assist distinct Hadoop distributions and enable IT to seamlessly install, run and manipulate Hadoop workloads on one regular platform.
better VMware vSphere Replication: vSphere Replication will carry dissimilar element-in-time snapshots for more granular recuperation. For stronger scalability, diverse appliances for replication are supported per vCenter Server. vSphere Replication is additionally supported for use with vSphere Storage vMotion and Storage DRS.
improved VMware vSphere statistics insurance plan: vSphere statistics coverage now restores at once to a host devoid of dependence on VMware vCenter Server. valued clientele can now backup and restoration particular person vmdk info and quiesce the vSphere information coverage appliance for long-time period retention purposes.
vSphere with Operations administration 5.5 might be released this quarter, with pricing that starts at $1,745 per processor.VMware’s ambitions are all within the cloud
The above improvements do not come as a large shock, besides the fact that children they may neatly be enticing to many VMware customers. greater fantastic become fresh news (which got here out a couple of months ago) of vCloud Hybrid service, a public infrastructure-as-a-service cloud that clients can access over the internet, just as they might with Amazon's cloud. vCloud Hybrid service will integrate with native VMware environments—therefore its name.
The service changed into scheduled to open to early access purchasers in June and to the established public in the third quarter of this year (i.e., by way of the end of September). considering that, there's a good possibility VMware could exhibit greater particular rollout dates and pricing this week.
once it be offering both a public cloud provider and on-premises virtualization and cloud infrastructure equipment, VMware can bolster its case for last a more sensible choice than Microsoft, which has the Hyper-V virtualization platform, system center management tools, and the home windows Azure public cloud.
Hyper-V is regularly closing the feature hole with VMware, and a new Microsoft partnership with Oracle offers its virtualization platform additional credibility within the business virtualization market, which has been dominated through VMware.
while Microsoft is the most urgent chance, VMware additionally have to cope with OpenStack, which customers can use to build Amazon-fashion infrastructure-as-a-service clouds with any hypervisor. or not it's a small market today, but adoption by way of carrier providers and tremendously technical corporations equivalent to CERN indicate OpenStack may additionally have a bright future.
Canonical and red Hat are each effective contenders for OpenStack deployments. VMware would likely decide on consumers use best VMware software, however it is making its products work with OpenStack to accommodate those consumers who want both.
"VMware’s support for OpenStack can be similar to a lot of its opponents," Wolf spoke of. "VMware will wholly aid the OpenStack APIs and provides consumers the choice to use just OpenStack or go with VMware’s proprietary application on top of OpenStack. HP, IBM, Cisco, and all different important rivals are also including proprietary extensions to 'add price'— translation: nonetheless lock shoppers in. So in the end, most dealer OpenStack implementations could be proprietary to a couple degree. There’s no such thing as a free lunch and vendors in the OpenStack group aren’t contributing to OpenStack basically for the decent of humanity."
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In-DepthSystem Center 1801 Is Here
A look at what's new in Virtual Machine Manager (VMM), Data Protection Manager (DPM) and Operations Manager (SCOM), for your virtualized infrastructure, either Hyper-V or VMware.
The first release of what Microsoft is planning as a twice-a-year release cycle for System Center Semi-Annual Channel (SAC) was just released. This cadence matches the twice a year new release of Windows Server.
In this article I'm going to look at what's new in Virtual Machine Manager (VMM), Data Protection Manager (DPM) and Operations Manager (SCOM), for your virtualized infrastructure, either Hyper-V or VMware.
Just like with Windows Server, there's a Long Term Servicing Channel (LTSC) with a five-year mainstream support cycle (bug fixes, new features and security fixes), followed by another five years of extended support (bug and security fixes only). The new SAC flavor is an alternative to LTSC and you need to look very carefully at your company's business needs before going down this track, as each release is only supported for 18 months, so you're going to be upgrading much more frequently. Note that the LTSC branch will keep getting updates in the form of Update Releases (URs) but that new features will mainly be targeted at the SAC branch.
Virtual Machine ManagerVMM 1801 supports both Windows Server 2016 and the SAC version 1709 as is to be expected, along with some new features in the OS that didn't make it into VMM 2016.
Nested Virtualization is one of those features, so you can now create a VM in VMM (or set it up in templates) with this turned on, allowing the VM in turn to be a virtualization host (see Figure 1). Unless you're running a training center (where Nested Virtualization is incredibly useful) I suspect the main reason for this would be to create Windows container hosts through VMM.[Click on image for larger view.] Figure 1. Nested Virtualization in Virtual Machine Manager.
Storage Quality of Service (QoS) was expanded massively in Windows Server 2016, unfortunately VMM 2016 only supported it for VHD/VHDX files on Storage Spaces Direct (S2D) and Scale out File Server (SOFS) clusters, not SANs. QoS policies also could only be scoped on a per-array basis. VMM 1801 can apply storage QoS on all storage and the policies can also be included in templates and be applied to VMM clouds.
Remoting to VMs can now be done over Enhanced Session mode in Hyper-V. Refreshing properties of hosts in VMM can be up to 10x faster.
Much of the work done in Windows Server 2016 Hyper-V was focused on the Software-Defined Networking (SDN) stack and a lot of that made it into VMM 2016. This new release adds some polish such as the ability to define Virtual IPs (VIPs) for the Software Load Balancer (SLB) in templates instead of only through PowerShell. The SLB now also supports internal load balancing (just like in Azure) and for guest clustering support it incorporates floating IPs where the SLB knows which node is active and routes traffic from the external VIP to the that node. HTTP or TCP health monitoring is now also built into the SLB (see Figure 2).[Click on image for larger view.] Figure 2. HTTP and TCP health monitoring are built-in to the Software Load Balancer.
Encryption of all network traffic on a VM network is just a tickbox away (see Figure 3). The only prerequisite is to distribute a certificate (internal CA or self-signed) to each host. This protects the network against network sniffing but not against fabric admins. Apparently network protection against fabric admins is coming, which would bring network protection in line with the host protection offered through Shielded VMs.[Click on image for larger view.] Figure 3. Easy network protection is only a tickbox away.
Speaking of Shielded VMs, this is now extended to Linux VMs (running on Windows Server 1709) and VMs can be defined with a Host Guardian Service (HGS) failback in case the primary cluster is offline. Shielded VMs is a big topic, if you're interested I presented on VMM 2016 at Ignite, with additional resources here.
The current plug-in for VMM to manage Azure VMs only supported the old flavor (ASM-based) whereas 1801 now provides the ability to manage your Azure Resource Manager (ARM)-based VMs, too.
There's a little bit of love for VMware, too, with the ability to convert an EFI VM to a Hyper-V generation 2 VM from vSphere (ESXi) 4.1, 5.0, 5.1, 5.5 and 6.0.
The main thing still missing from VMM is a rewrite of the services deployment engine. Public Azure and Azure Stack build on ARM, which is becoming a critical skill for IT professionals, whereas VMM still has its own, graphical service template designer. If this was rewritten to support ARM, the same skills would be applicable across all three environments.
System Center Operations Manager (SCOM)The headline feature in this release of SCOM is the new HTML5 Web console. Microsoft has been moving this console to HTML5 for some time, but the dashboards were still relying on Silverlight in SCOM 2016. This version finally sheds that baggage (although you can still get to the old dashboards if you really want to at http://server/Dashboard); the new dashboards supports Alert, State, Performance, Topology, Tile and Custom widgets.
A nice touch is the ability to expand a dashboard to full screen -- useful if your NOC is plastered with large screens. You can export a custom dashboard by exporting the management pack (MP) in which it's stored. Dashboards can be customized, and a user accessing the Web console can also chose to personalize settings -- note that these are stored in that browser so if you open the Web console on another device your personalizations won't appear there.
The Topology widget lets you import a diagram from Visio or other sources and drag your health state icons on top of the diagram to create network/geographical diagrams with health information.
The new widgets also support drilling down from the overview to a more focused view. For instance, from an Alert view you can drill down to a specific alert and then to the rule that generated the alert.
Adding custom knowledge for your company no longer requires Word and access to the Operations Console, you can simply use the built-in editor in the widgets. More information on these new dashboards can be found on the SCOM Team Blog.
With Microsoft claiming back the responsibility for the catalog of first- and third-party Management Packs (MPs) in SCOM 2016 and providing an Updates (did you know there's a new version of your MP release?) and Recommendations (we see you're running this, perhaps you'd like to download this MP?) feature, in 1801 this extends to third-party MPs, as well.
SCOM 1801 continues the integration with Operations Management Suite (OMS), this time extending to Service Map. This is a technology (originally acquired from BlueStripe software) which essentially automates the discovery of dependencies in distributed applications and creates the diagrams automatically, something you had to do manually in earlier SCOM versions.
Protegrity, an enterprise database security solutions vendor headquartered in Stamford, Connecticut, offers products that protect databases, files and applications. The Protegrity Database Protector product works with many popular databases.Product features
Protegrity Database Protector provides column- and field-level protection of confidential and sensitive data stored in nearly any type of relational database, but may make some changes to the database schema and/or applications (although minimal). Supported operating systems include Linux, UNIX and Windows, as well as IBM iSeries and zSeries environments.
The policies that enforce controls are stored separately from the database being protected. For compliance purposes, policy control follows a separation of duties model in which only authorized personnel, such as a security administrator, may grant access to certain types of data to certain users.
Administrators use the Protegrity Enterprise Security Administrator (ESA) central console to configure and manage policies, keys, auditing and reporting. Like all leading database security products, the ESA uses a dashboard to display the status of pertinent activities -- systems, deployed policies, and both internal and policy audits. Administrators can also view all data access attempts and any changes to security policies.
The ESA comes with a collection of standard management and compliance reports, and administrators can create custom reports as needed.
The two primary components of Protegrity Database Protector are the Communications Agent and the Policy Enforcement Agent. The Communications Agent runs between the ESA and the Database Protector, and manages policy and audit log communications. The Policy Enforcement Agent, as the name implies, enforces data protection policies.
Protegrity Database Protector uses the AES-256 encryption algorithm to encrypt data.
Tokens -- which appear as replacement values in database views to keep the actual data hidden from unauthorized users -- are optional.
Prospective customers who are comparing database encryption products from several vendors will notice a lack of detailed information on the Protegrity website. At this writing, Protegrity required registration to receive more detailed information about their products.Pricing and licensing
Protegrity Database Protector is sold for specific databases, including Oracle, SQL Server, DB2 and others. Oracle Database Protector, for example, costs approximately $17,000 annually for a two-year license or $45,000 for a perpetual license.
Protegrity Enterprise Security Administrator, the management console, costs about $32,000 (two-year term) to $84,500 (perpetual) for a single environment.Support
Standard technical support is available by phone 24×7. Customers can use online chat to discuss support issues and to open a support case, or send questions via email. A support contract is required to use the online support portal to request support and track cases. Compared to other database encryption vendors, Protegrity's online support offerings are fairly slim.
In this chapter
Without memory for storing data, it's impossible for a program to get any work done. (Or rather, it's impossible to get any useful work done.) Real-world programs can't afford to rely on fixed-size buffers or arrays of data structures. They have to be able to handle inputs of varying sizes, from small to large. This in turn leads to the use of dynamically allocated memory—memory allocated at runtime instead of at compile time. This is how the GNU "no arbitrary limits" principle is put into action.
Because dynamically allocated memory is such a basic building block for real-world programs, we cover it early, before looking at everything else there is to do. Our discussion focuses exclusively on the user-level view of the process and its memory; it has nothing to do with CPU architecture.
For a working definition, we've said that a process is a running program. This means that the operating system has loaded the executable file for the program into memory, has arranged for it to have access to its command-line arguments and environment variables, and has started it running. A process has five conceptually different areas of memory allocated to it:
Often referred to as the text segment, this is the area in which the executable instructions reside. Linux and Unix arrange things so that multiple running instances of the same program share their code if possible; only one copy of the instructions for the same program resides in memory at any time. (This is transparent to the running programs.) The portion of the executable file containing the text segment is the text section.
Statically allocated and global data that are initialized with nonzero values live in the data segment. Each process running the same program has its own data segment. The portion of the executable file containing the data segment is the data section.
Global and statically allocated data that are initialized to zero by default are kept in what is colloquially called the BSS area of the process.1 Each process running the same program has its own BSS area. When running, the BSS data are placed in the data segment. In the executable file, they are stored in the BSS section.
The format of a Linux/Unix executable is such that only variables that are initialized to a nonzero value occupy space in the executable's disk file. Thus, a large array declared 'static char somebuf;', which is automatically zero-filled, does not take up 2 KB worth of disk space. (Some compilers have options that let you place zero-initialized data into the data segment.)
The heap is where dynamic memory (obtained by malloc() and friends) comes from. As memory is allocated on the heap, the process's address space grows, as you can see by watching a running program with the ps command.
Although it is possible to give memory back to the system and shrink a process's address space, this is almost never done. (We distinguish between releasing nolonger-needed dynamic memory and shrinking the address space; this is discussed in more detail later in this chapter.)
It is typical for the heap to "grow upward." This means that successive items that are added to the heap are added at addresses that are numerically greater than previous items. It is also typical for the heap to start immediately after the BSS area of the data segment.
The stack segment is where local variables are allocated. Local variables are all variables declared inside the opening left brace of a function body (or other left brace) that aren't defined as static.
On most architectures, function parameters are also placed on the stack, as well as "invisible" bookkeeping information generated by the compiler, such as room for a function return value and storage for the return address representing the return from a function to its caller. (Some architectures do all this with registers.)
It is the use of a stack for function parameters and return values that makes it convenient to write recursive functions (functions that call themselves).
Variables stored on the stack "disappear" when the function containing them returns; the space on the stack is reused for subsequent function calls.
On most modern architectures, the stack "grows downward," meaning that items deeper in the call chain are at numerically lower addresses.
When a program is running, the initialized data, BSS, and heap areas are usually placed into a single contiguous area: the data segment. The stack segment and code segment are separate from the data segment and from each other. This is illustrated in Figure 3.1.
Figure 3.1 Linux/Unix process address space
Although it's theoretically possible for the stack and heap to grow into each other, the operating system prevents that event, and any program that tries to make it happen is asking for trouble. This is particularly true on modern systems, on which process address spaces are large and the gap between the top of the stack and the end of the heap is a big one. The different memory areas can have different hardware memory protection assigned to them. For example, the text segment might be marked "execute only," whereas the data and stack segments would have execute permission disabled. This practice can prevent certain kinds of security attacks. The details, of course, are hardware and operating-system specific and likely to change over time. Of note is that both Standard C and C++ allow const items to be placed in read-only memory. The relationship among the different segments is summarized in Table 3.1.Table 3.1 Executable program segments and their locations
Address space segment
Executable file section
The size program prints out the size in bytes of each of the text, data, and BSS sections, along with the total size in decimal and hexadecimal. (The ch03-memaddr.c program is shown later in this chapter; see Section 3.2.5 Address Space Examination," page 78.)$ cc -o ch03-memaddr.c -o ch03-memaddr Compile the program $ ls -l ch03-memaddr Show total size -rwxr-xr-x 1 arnold devel 12320 Nov 24 16:45 ch03-memaddr $ size ch03-memaddr Show component sizes text data bss dec hex filename 1458 276 8 1742 6ce ch03-memaddr $ strip ch03-memaddr Remove symbols $ ls -l ch03-memaddr Show total size again -rwxr-xr-x 1 arnold devel 3480 Nov 24 16:45 ch03-memaddr $ size ch03-memaddr Component sizes haven't changed text data bss dec hex filename 1458 276 8 1742 6ce ch03-memaddr
The total size of what gets loaded into memory is only 1742 bytes, in a file that is 12,320 bytes long. Most of that space is occupied by the symbols, a list of the program's variables and function names. (The symbols are not loaded into memory when the program runs.) The strip program removes the symbols from the object file. This can save significant disk space for a large program, at the cost of making it impossible to debug a core dump2 should one occur. (On modern systems this isn't worth the trouble; don't use strip.) Even after removing the symbols, the file is still larger than what gets loaded into memory since the object file format maintains additional data about the program, such as what shared libraries it may use, if any. 3
Finally, we'll mention that threads represent multiple threads of execution within a single address space. Typically, each thread has its own stack, and a way to get thread local data, that is, dynamically allocated data for private use by the thread. We don't otherwise cover threads in this book, since they are an advanced topic.
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