Seminar Report - Managing the Cloud with Open Source Tools

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  • 1. Managing the Cloud with Open Source Tools A seminar report submitted in partial fulfilment of the requirements for the award of the degree of Bachelor of Technology in Computer Science and Engineering (University of Calicut) by Nakul E Sibiraj Department of Computer Science & Engineering MES College of Engineering, Kuttippuram(ISO 9001-2000 Certified Institution, Affiliated to University of Calicut) Thrikkanapuram PO, Malappuram Dt, Kerala - 679573 2011-12
  • 2. CertificateThis is to certify that the seminar report entitled “Managing the cloud withopen source tools” is a bonafide record of the work done by Nakul E Sibiraj(Roll no: 08103138) under our supervision and guidance. The report has been sub-mitted to the Department of Computer Science and Engineering of MESCollege of Engineering in partial fulfilment of the award of the degree of Bach-elor of Technology in Computer Science and Engineering.Dr. Abdul Haleem P.P Ms. Binu JohnProfessor and Head Seminar GuideDept.of Computer Science and Engineering Assistant ProfessorMES College of Engineering Dept.of Computer Science and Engineering MES College of Engineering
  • 3. iii Abstract Cloud computing is a promising paradigm designed to harness the power ofnetworks of computers and communications in a more cost effective way. Cloudsprovide elastic capacity to serve a wide and constantly expanding range of infor-mation processing needs, including government, military, business and education.The cloud computing paradigm is maturing rapidly and is being considered foradoption in government and business platforms. Open source systems refer tosoftware systems whose source code is available, allowing for immediate incorpo-ration of improvements and adaptations of the system by its users. This paperreports on an evaluation of open source management tools for cloud computing.Cloud computing is not a magical solution, planning and management of resourcesand the cloud in itself is pivotal. In this report, we compare and evaluate a numberof open source tools used in the industry to manage and automate the cloud. Weevaluate provisioning tools, orchestration tools, configuration tools and monitoringtools.
  • 4. iv Acknowledgements I take this opportunity to convey my deep and sincere thanks to ourPrincipal, Dr. V. H. Abdul Salam and Head of the Department, Dr. AbdulHaleem P.P, for providing all facilities for my seminar presentation. I express my heartiest thanks to my guide, Ms. Binu John, Asst. Professor,dept. of CSE for her timely guidance and help. I also extend my deep gratitude to my seminar coordinators Mr. ArunAnoop M, Asst Prof, dept. of CSE, Mr. Aneesh M Haneef, Asst Prof, dept. ofCSE and Ms. Jabin A, Asst. Prof, dept. of CSE for their valuable help andsupport in presenting the seminar. I express my sincere gratitude to all the staff of Computer Science andEngineering Department and my beloved family members who helped me withtheir timely suggestions and support. I also express my sincere thanks to all my friends who helped me through-out the successful completion of the work. Nakul E Sibiraj
  • 5. v ContentsChapter1 Introduction 12 What is Cloud Computing? 2 2.1 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.3 Deployment Models . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Open Source Philosophy and Impact 7 3.1 What is Open Source? . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Why Open Source? . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Open Source and Cloud Computing 9 4.1 State of Open Source Adoption in Cloud Computing . . . . . . . . 105 Open Source Cloud Management Tools 12 5.1 Importance of Cloud Management Tools . . . . . . . . . . . . . . . 12 5.2 Cloud Management Disciplines . . . . . . . . . . . . . . . . . . . . 13 5.2.1 Provisioning Tools . . . . . . . . . . . . . . . . . . . . . . . 13 5.2.2 Configuration Management Tools . . . . . . . . . . . . . . . 15 5.2.3 Automation/Orchestration Tools . . . . . . . . . . . . . . . 16 5.2.4 Monitoring Tools . . . . . . . . . . . . . . . . . . . . . . . . 18
  • 6. vi6 Conclusions 20Bibliography 21
  • 7. vii TablesTable 5.1 Comparison of Provisioning Tools . . . . . . . . . . . . . . . . . . . 13 5.2 Comparison of Configuration Tools . . . . . . . . . . . . . . . . . . 15 5.3 Comparison of Automation Tools . . . . . . . . . . . . . . . . . . . 17 5.4 Comparison of Monitoring Tools . . . . . . . . . . . . . . . . . . . . 18
  • 8. viii FiguresFigure 2.1 Cloud Computing Layers . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Cloud Computing Deployment Models . . . . . . . . . . . . . . . . 6
  • 9. Chapter 1 Introduction Cloud computing is the delivery of computing as a service rather than a prod-uct, whereby shared resources, software, and information are provided to comput-ers and other devices as a utility (like the electricity grid) over a network (typicallythe Internet). Cloud computing is an emerging computing technology that is rapidly con-solidating itself as the next big step in the development and deployment of anincreasing number of distributed applications. Open source refers to any software system whose source code is made avail-able for use or modification by third-party developers. Thus, unlike centralized,proprietary software development models, open source offers practical accessibilityto the source code, allowing for immediate and concurrent incorporation of dif-ferent approaches, and eventually, the branching of the system into customizedvariants. Merging these two trends leads to a new breed of tools: Open source cloudcomputing tools (OSCCT). These tools provide a free, customizable infrastructureto deploy clouds for any type of application domain. Cloud computing is not a management solution, it has to be managed well toyield success. We take a look at the various open source tools available to managethe cloud in the various management disciplines of the cloud.
  • 10. Chapter 2 What is Cloud Computing? Cloud computing is a marketing term for technologies that provide compu-tation, software, data access, and storage services that do not require end-userknowledge of the physical location and configuration of the system that deliversthe services. A parallel to this concept can be drawn with the electricity grid,wherein end-users consume power without needing to understand the componentdevices or infrastructure required to provide the service. Cloud computing describes a new supplement, consumption, and deliverymodel for IT services based on Internet protocols, and it typically involves provi-sioning of dynamically scalable and often virtualised resources. It is a by-productand consequence of the ease-of-access to remote computing sites provided by theInternet. This may take the form of web-based tools or applications that users canaccess and use through a web browser as if the programs were installed locally ontheir own computers. Cloud computing providers deliver applications via the internet, which areaccessed from web browsers and desktop and mobile apps, while the business soft-ware and data are stored on servers at a remote location. Cloud computing is built upon the broader concept of infrastructure conver-gence (or converged infrastructure) and shared services. This type of data centerenvironment allows enterprises to get their applications up and running faster,with easier manageability and less maintenance, and enables IT to more rapidly
  • 11. 3adjust IT resources (such as servers, storage, and networking) to meet fluctuatingand unpredictable business demand. Most cloud computing infrastructures consist of services delivered throughshared data-centers and appearing as a single point of access for consumer’s com-puting needs. Commercial offerings may be required to meet service-level agree-ments (SLAs), but specific terms are less often negotiated by smaller companies.2.1 Characteristics Here are some of the characteristics of cloud computing that urges businessesand enterprises to adopt cloud computing. • Application Programming Interface (API) provides accessibility to software the same way the user interface facilitates interaction between humans and computers. • Cost is claimed to be reduced and in a public cloud delivery model, capital expenditure is converted to operational expenditure. This is purported to lower barriers to entry, as infrastructure is typically provided by a third- party and does not need to be purchased for one-time or infrequent inten- sive computing tasks. Pricing on a utility computing basis is fine-grained with usage-based options and fewer IT skills are required for implementa- tion. • Device and location independence enable users to access systems us- ing a web browser regardless of their location or what device they are using (e.g., PC, mobile phone). As infrastructure is off-site (typically provided by a third-party) and accessed via the Internet, users can connect from anywhere.
  • 12. 4 • Multi-tenancy enables sharing of resources and costs across a large pool of users thus allowing for: ∗ Centralisation of infrastructure in locations with lower costs (such as real estate, electricity, etc.) ∗ Peak-load capacity increases (users need not engineer for highest possible load-levels) ∗ Utilisation and efficiency improvements for systems that are often only 10 to 20% utilised. • Reliability is improved if multiple redundant sites are used, which makes well-designed cloud computing suitable for business continuity and disaster recovery. • Scalability and Elasticity via dynamic (”on-demand”) provisioning of resources on a fine-grained, self-service basis near real-time, without users having to engineer for peak loads. • Maintenance of cloud computing applications is easier, because they do not need to be installed on each user’s computer.2.2 Layers Once an internet protocol connection is established among several computers,it is possible to share services within any one of the following layers.
  • 13. 5 Figure 2.1: Cloud Computing Layers Client: A cloud client consists of computer hardware and/or computer soft-ware that relies on cloud computing for application delivery and that is in essenceuseless without it. Examples include some computers, phones and other devices,operating systems, and browsers. Application: Cloud application services or ”Software as a Service (SaaS)”deliver software as a service over the Internet, eliminating the need to install andrun the application on the customer’s own computers and simplifying maintenanceand support. Platform: Cloud platform services, also known as platform as a service(PaaS), deliver a computing platform and/or solution stack as a service, oftenconsuming cloud infrastructure and sustaining cloud applications. It facilitatesdeployment of applications without the cost and complexity of buying and man-aging the underlying hardware and software layers. Infrastructure: Cloud infrastructure services, also known as ”infrastruc-ture as a service” (IaaS), deliver computer infrastructure typically a platformvirtualisation environment as a service, along with raw (block) storage and net-working. Rather than purchasing servers, software, data-center space or networkequipment, clients instead buy those resources as a fully outsourced service. Server: The servers layer consists of computer hardware and/or computersoftware products that are specifically designed for the delivery of cloud services,including multi-core processors, cloud-specific operating systems and combined
  • 14. 6offerings.2.3 Deployment Models Figure 2.2: Cloud Computing Deployment Models Public cloud is one based on the standard cloud computing model, in whicha service provider makes resources, such as applications and storage, available tothe general public over the Internet. Public cloud services may be free or offeredon a pay-per-usage model. Private cloud is infrastructure operated solely for a single organization,whether managed internally or by a third-party and hosted internally or exter-nally. They have attracted criticism because users ”still have to buy, build, andmanage them” and thus do not benefit from lower up-front capital costs and lesshands-on management, essentially ”[lacking] the economic model that makes cloudcomputing such an intriguing concept” Hybrid cloud is a composition of two or more clouds (private, community,or public) that remain unique entities but are bound together, offering the benefitsof multiple deployment models. It can also be defined as multiple cloud systemsthat are connected in a way that allows programs and data to be moved easilyfrom one deployment system to another.
  • 15. Chapter 3 Open Source Philosophy and Impact3.1 What is Open Source? Open source software is usually developed as a public collaboration and is of-ten made freely available. Open source is indeed a certification mark owned by theopen source initiative (OSI). It is a software that is intended to be freely shared,modified, and redistributed by others who may use the open source trademark,provided that the distribution terms conform to the OSI’s open source definition.The main elements in this definition are: (1) The software must be redistributed without restriction. (2) The source code must be made available. (3) The license can require improved versions of the software to carry a differ- ent name or version from the original software.3.2 Why Open Source? Here is a list of some of the aspects of open source that may represent acompetitive advantage in the software market especially cloud computing. • The continuous and broad peer-review enabled by publicly available source code supports software reliability and security efforts through the identifi-
  • 16. 8 cation and elimination of defects that might otherwise go unrecognized by a more limited core development team.• The unrestricted ability to modify software source code enables the de- partment to respond more rapidly to changing situations, missions, and future threats.• Reliance on a particular software developer or vendor due to proprietary restrictions may be reduced by the use of OSS, which can be operated and maintained by multiple vendors, thus reducing barriers to entry and exit.• Since OSS typically does not have a per-seat licensing cost, it can provide a cost advantage in situations where many copies of the software may be required, and can mitigate risk of cost growth due to licensing in situations where the total number of users may not be known in advance.
  • 17. Chapter 4 Open Source and Cloud Computing Open source software (OSS) is a common thread permeating cloud comput-ing. It is being used to build the cloud (such as the Linux foundation for Google,salesforce.com and Amazon cloud services); it is being built on top of cloud services(for example, Eucalyptus); and proprietary software used to deliver cloud servicesis increasingly being moved into open source (including Facebook open platformand Hadoop). The relationship that is being forged between OSS and cloud computing isnot a matter of coincidence; it is a matter of symbiosis. Massive data centers builton low-cost commodity hardware and virtualized operating environments providethe technical foundations for global class cloud-based services. Cloud computing and open source share a common connection when a layerof software can be abstracted, they both act as agents to fundamentally alter tra-ditional economic assumptions. Cloud computing does this through lower servicecosts, greater resource sharing, greater economies of scale, greater levels of archi-tectural standardization and process optimization, and the ability to modify theusage of those resources much more quickly than with traditional software. Open-source software does this by eliminating the ability of any one provider to exploitthe terms and conditions of an end user license agreement linked to proprietarycode - a problem that increases, the more ubiquitous a product becomes. In this way, cloud computing and open-source software are synergistically
  • 18. 10bound in a virtuous circle. Cloud computing directly benefits from greater use ofOSS, because it eliminates critical dependencies that can impact service delivery.And the more that cloud computing utilizes OSS, the more mature and diversethe open-source stack will become. The more mature and diverse the stack, themore cloud can expand. Another important dynamic of open source software is that it is conduciveto service-based business models - a function of the fact that it is very difficultto commercialize code with a fluid ownership structure. Therefore, unlike soft-ware governed under an end user license agreement, open-source software enablescloud providers to tie component Service-Level Agreements (SLAs) to their owncustomer-facing SLAs, which allows for risk distribution.4.1 State of Open Source Adoption in Cloud Computing Open source adoption in the cloud computing environment though has notreached the expected heights, is still highly relevant. It is observed that the adop-tion of OSS varies with the specializations and layers of cloud computing. In the software as a service layer, open source has put up a disappointingperformance. It was estimated every year that the next year SAAS will see moreopen source vendors. But, all of the major SAAS vendors such as google use closedsource software. The more frustrating aspect to the open source community is thatmost of these services run on open source platforms such as LAMP. Things are a little better in the platform as a service layer with a lot moreinvolvement from the open source community and industry with services such asAppScale and RedHat’s OpenShift project. The layer in which you see maximum involvement from the open sourceindustry is the infrastructure as a service layer. The leader in the public IAASis Amazon’s EC2 which is not open source, but it is in close competition with
  • 19. 11Rackspace’s open source project CloudStack. And in the on-premise or private IAAS, we see total domination by opensource technologies with Eucalyptus leading and other open source vendors suchas Redhat, OpenNebula and Rackspace trailing close by.
  • 20. Chapter 5 Open Source Cloud Management Tools Now that we have made a case for both cloud computing and open sourcewe will list and evaluate the various disciplines, leading tools from each disciplineand after understanding the importance of rightful management and automationof the cloud.5.1 Importance of Cloud Management Tools This is where life in the cloud can get very complicated. Its simple enoughto describe how to use some kind of cloud computing service, but you also have tointegrate it into the IT operations of the organization, and that isnt necessarily asimple thing to do. For example, because a cloud requires a self-service capability, it must bedesigned to manage not just provisioning customer requests but also issues suchas workload management, security, metering, monitoring, and billing services. Many managers understand that for cloud services to be safe and effective,they must measure and monitor performance. In fact, performance monitoring will become increasingly important as com-panies rely more on third-party services. And, from all indications, a typicalcompany may use more than one cloud services provider. For example, a companymay use one cloud provider for a platform such as collaboration and a completelydifferent provider for compute services. They may use another provider for storage.
  • 21. 13 Using tools to automate these various tasks are important. Having to per-form these tasks manually is a tedious task and takes away from the cloud char-acteristics of speed, cost-efficiency and convenience.5.2 Cloud Management Disciplines Cloud management is primarily classified into four disciplines:- (1) Provisioning (2) Configuration Management (3) Automation/Orchestration (4) Monitoring5.2.1 Provisioning Tools In terms of networking, provisioning is the process of preparing and equip-ping a network to allow it to provide (new) services to its users. In the cloud,provisioning tools are mostly used for the installation of operating systems andother software. Language License Targets Cobbler Python GPL RedHat, OpenSUSE, Fedora, Debian, Ubuntu FAI Perl GPL Debian Kickstart Python GPL Most Debian & Red Hat based distros Viper Perl GPL Debian Table 5.1: Comparison of Provisioning Tools Let us take a deeper look at some of the leading open source provisioningtools in detail:-
  • 22. 14• Cobbler is a linux provisioning server that centralizes and simplifies con- trol of services including DHCP, TFTP, and DNS for the purpose of per- forming network-based operating system installations. It can be config- ured for PXE, reinstallations, and virtualized guests using Xen, KVM or VMware. Cobbler interacts with the koan program for re-installation and virtualization support. koan and cobbler use libvirt to integrate with dif- ferent virtualization software. Cobbler builds on the kickstart mechanism and offers installation profiles that can be applied to one or many machines. It also features integration with yum to aid in machine installs. Although cobbler primarily targets RPM-based installs via kickstart and anaconda, it can be used to configure a PXE server to boot various non- RPM boot images such as knoppix and other flavors of debian.• FAI is a non-interactive system to install, customize and manage linux sys- tems and software configurations on computers as well as virtual machines and chroot environments, from small networks to large-scale infrastruc- tures and clusters. It’s a tool for unattended mass deployment of linux. You can take one or more virgin PC’s, turn on the power, and after a few minutes, the systems are installed, and completely configured to your exact needs, without any interaction necessary.• Kickstart installation method is used primarily (but not exclusively) by the Red Hat Enterprise Linux operating system to automatically perform unattended operating system installation and configuration. Redhat pub- lishes cobbler as a tool to automate the kickstart configuration process.• Viper is a provisioning tool released under the GPLv3 license and can
  • 23. 15 be used to install debian and some debian derived distributions. Viper is coded entirely in perl.5.2.2 Configuration Management Tools Configuration management (CM) is a field of management that focuses onestablishing and maintaining consistency of a system or product’s performance andits functional and physical attributes with its requirements, design, and operationalinformation throughout its life. In the cloud, it is used mostly to set parameters for servers and start/stopvarious services. Year Started Language License bcfg2 2003 Python BSD Cfengine 1993 C Apache Chef 2009 Ruby Apache Puppet 2004 Ruby GPL Table 5.2: Comparison of Configuration Tools Let us take a deeper look at some of the leading open source configurationmanagement tools used in the cloud. • Bcfg2 is a configuration management tool developed in the mathematics and computer science division of Argonne National Laboratory. Bcfg2 aids in the infrastructure management lifecycle conguration analysis, service deployment, and conguration auditing. It includes tools for visualizing conguration information, as well as reporting tools that help administrators understand conguration patterns in their environments. • Cfengine is a popular open source configuration management system, written by Mark Burgess. Its primary function is to provide automated configuration and maintenance of large-scale computer systems, including
  • 24. 16 the unified management of servers, desktops, embedded networked devices, mobile smartphones, and tablet computers. • Chef is a configuration management tool written in ruby. It uses a pure- ruby, domain-specific language (DSL) for writing system configuration ”re- cipies”. Chef was written by opscode and is released as open source under the Apache license 2.0. • Puppet is a tool designed to manage the configuration of UNIX-like and Microsoft Windows systems declaratively. The user describes system re- sources and their state, either using puppet or ruby DSL (domain-specific language). This information is stored in files called ”Puppet manifests”. Puppet discovers the system information via a utility called facter, and compiles the Puppet manifests into a system-specific catalog containing resources and resource dependency, which are applied against the target systems and any actions taken to remediate the system to the desired state will be reported.5.2.3 Automation/Orchestration Tools Orchestration describes the automated arrangement, coordination, and man-agement of complex computer systems, middleware, and services. It is basicallyused in the cloud to automate tasks across systems. Cloud service orchestration is the:- • Composing of architecture, tools and processes by humans to deliver a defined service • Stitching of software and hardware components together to deliver a de- fined service
  • 25. 17 • Connecting and automating of work flows when applicable to deliver a defined service Language License Support Organization AutomateIT Ruby GPL None Capistrano Ruby MIT None Control Tier Java Apache DTO Solutions Func Python GPL Fedora Project RunDeck Java Apache DTO Solutions Table 5.3: Comparison of Automation Tools Let us take a deeper look at some of the leading open source configurationmanagement tools used in the cloud. • AutomateIT is an open source tool for automating the setup and main- tenance of servers, applications and their dependencies. It provides a sur- prisingly simple, yet powerful, way to manage files, packages, services, networks, accounts, roles, templates and more. • Capistrano is an open source tool for running scripts on multiple servers; its main use is deploying web applications. It automates the process of making a new version of an application available on one or more web servers, including supporting tasks such as changing databases. • Control Tier is an open source, cross-platform build and deployment automation framework. ControlTier can help you to coordinate and scale service management and administration activities across multiple nodes and application tiers. • Func is a two-way authenticated system developed under the Fedora project. You can build your own applications on top of it, and easily expand func by adding in additional modules, whether you want these to work through the func command line or by means of some other application.
  • 26. 18 • RunDeck is cross-platform open source software that helps you automate ad-hoc and routine procedures in data center or cloud environments. Run- Deck allows you to run tasks on any number of nodes from a web-based or command-line interface. RunDeck also includes other features that make it easy to scale up your scripting efforts including: access control, work- flow building, scheduling, logging, and integration with external sources for node and option data.5.2.4 Monitoring Tools In terms of networking, monitoring describes the use of a system that con-stantly monitors a computer network for slow or failing components and thatnotifies the network administrator (via email, pager or other alarms) in case ofoutages. Monitoring tools are used in the cloud to record errors and health of the ITinfrastructure. License Language Type of Monitoring Collection Methods Cacti GPL PHP Performance SNMP, syslog Nagios GPL C/PHP Availability SNMP, TCP, ICMP, IPMI, syslog Zabbix GPL C/PHP Availability, Performance SNMP, TCP/ICMP/ IPMI, Synthetic Trans- actions Zenoss GPL Python Availability, Performance, SNMP, ICMP, SSH, sys- Event Management log, WMI Table 5.4: Comparison of Monitoring Tools Let us take a deeper look at some of the leading open source configurationmanagement tools used in the cloud. • Cacti is an open source, web-based graphing tool designed as a frontend
  • 27. 19 to RRDtool’s data storage and graphing functionality. Cacti allows a user to poll services at predetermined intervals and graph the resulting data. It is generally used to graph time-series data of metrics such as CPU load and network bandwidth utilization. A common usage is to monitor network traffic by polling a network switch or router interface via SNMP.• Nagios is a popular open source computer system and network monitoring software application. It watches hosts and services, alerting users when things go wrong and again when they get better.• Zabbix is designed to monitor and track the status of various network services, servers, and other network hardware.• Zenoss is an open source application, server and network management platform based on the Zope application server. Released under the GNU General Public License (GPL) version 2, Zenoss Core provides a web in- terface that allows system administrators to monitor availability, inven- tory/configuration, performance and events.
  • 28. Chapter 6 Conclusions The leading technical research agency Gartner reports that by 2015, 20% ofthe information technology based organizations would have completely adopted acloud computing solution, and 98% of enterprises use open source tools to managethe cloud. Cloud computing and open source presents numerous opportunities toeach other. Cloud computing is a promising paradigm designed to harness the power ofnetworks of computers and communications in a more cost effective way. We haveseen how the cloud computing hype is a reality and about the symbiosis betweenopen source and cloud computing. We also evaluated the top management toolsused in the cloud clearly establishing the open source dominance in that field. Open source software for the most part of their existence has been disrupters,be it the field of operating systems, databases or basic desktop and web program-ming. But, cloud computing provides the open source industry to be an innovatorof the new rather than a disrupter of the old.
  • 29. Bibliography[1] Manuel Rodriguez-Martinez, Jaime Seguel, ”Open Source Cloud Computing Tools: A Case Study”, IEEE Paper[2] Judith Hurwitz, Robin Bloor, Marcia Kaufman, and Dr. Fern Halper, ”Cloud Computing for Dummies”[3] Mark R. Hinkle, ”Crash Course in Open Source Cloud Computing” in Proc. Infosec, 2011[4] Mark R. Hinkle, ”Build your Cloud: Simple, Cost Effective, Open Source” in Proc. OSCON 2011[5] Marten Mickos, ”Open Source and Cloud Computing: A Natural Fit or Mortal Enemies?” in Proc. OSCON 2010[6] Mark R. Hinkle, ”Open Source Tool Chains”, in Proc. OSCON 2010[7] Simon Wardley, ”Cloud Computing: Why it Matters?” in Proc. OSCON 2009[8] Wikipedia.org[9] HowStuffWorks.com