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Linux Linux Presentation Transcript

  • LINUX -101
  • What is Linux?is an Operating Systemis a clone of Unix Operating systemis design to run on a PCis Multi-tasking / Multi-user
  • What is Linux? is robust and scalable is stable is open-source as are most application available for it is growing in popularity (apache) is portable (PDA , cellphones, car and appliances) is secure
  • History of Linux In 1991, Linus Torvalds, a student at the University of Helsinki Finland, developed the Linux kernel. It was released on the internet and was freely available for download. Back in 1983,the Free Software foundation( www.fsf.org) began developing open source software to create a free Unix operating system, this software was called the GNU(guh-noo) utilities. GNU stands for “GNU’s not unix”
  • History of Linux Around 1991, the GNU utilities were combined with the Linux kernel. Today most of people call this operating system Linux. however, the free software foundation says that this is incorrect and it should be called GNU/Linux. You should know that the Linux source and most applications for it are free of charge, So any company charging you for Linux is not charging you for the software but instead, for the compiling of the software, the packaging , and support of the software.
  • Licensing Information Is the most important part of the Open Source Software movement. Is legally covered by the GNU General Public License , is also known as GPL. GPL allows people to take free software and distribute their own versions of the software.
  • Licensing InformationHowever, the vendors who sell freesoftware cannot restrict the right s of userswho purchase the software . In otherwords, users who buy GPL software canmake copies of it and distribute it free ofcharge or for a fee.
  • Licensing InformationAlso distributors of GPL software mustmake it clear that the software is coveredby the GPL and must provide the completesource code for the software at no cost.Linux is the perfect example of how this issupposed to work.
  • Open Source An open source license  is a copyright license for computer software that makes the source code  available for everyone to use. This allows end users to review and modify the source code for their own customization and/or troubleshooting needs. Open Source software is free but is not in the public domain , it is not shareware either.
  • Open Source Open-source licenses are also commonly free , allowing for modification, redistribution, and commercial use without having to pay the original author. Some open-source licenses only permit modification of the source code for personal use or only permit non-commercial redistribution.
  • Open Source All such licenses usually have additional restrictions such as a requirement to preserve the name of the authors and a copyright statement within the code. One popular set of free open-source software licenses are those approved by the Open Source Initiative (OSI) based on their Open Source Definition (OSD).
  • When Red Hat released its fully packagedversion of Linux with support its popularitytook-off, soon after that commercial vendorslike IBM ,Dell , and HP began pushing LinuxServers. Linux continues to increase inpopularity more and more mainstreamcomputer users.
  • Types of LinuxA Linux Distribution is a precompiled andpre-packaged version of Linux. It may offercertain features and software applicationsthat others do not. There over 300 differentLinux distributions. Here are some of themost popular:Red Hat/fedora/enterpriseDebianSUSE(Novell)Gentoo
  • Linux ClonesA Linux Clone is a Linux version on acertain distribution , for example , CentOSand White Box Enterprise Linux(to name acouple) take the Red Hat Enterprise Linuxsource and recompile it . This way usersget the stability and benefits of the RedHat Enterprise Linux code but at no cost.
  • Linux vs. Unix Linux is a Unix like operating system Unix is “the original” Unix is broken down into system V and BSD Unix is typically run on a larger mini- computers and distributed through commercial variants like IBM’s AIX and Sun’s Solaris.
  • Linux vs. Unix However, you can get free Unix ,Free BSD Linux is made for PC’s and lower end Servers Linux is a type of Unix
  • Comparison of Linux and WindowsWindows StrengthsBetter supportMore software availableEasier for new users to useProfessionals & Commercial TeamsClosed source makes it more secure(debatable).
  • Comparison of Linux and WindowsWindows WeaknessesBecause of its popularity it is the targetClosed source makes modificationdifficultCostStability
  • Comparison of Linux and WindowsLinux StrengthsOpen Source make it more secure (debatable)Costs less (free)Most Applications are freeHighly portableHighly customizableThe “Networking OS”
  • Comparison of Linux and WindowsLinux WeaknessesChallenging to learn how to useCan be difficult to install applications andpatchesDevices are not always supported (like on alaptop)Application aren’t always available
  • Linux CertificationsTopics to coverLinux + ( Comp TIA ) A+, Net+, Server+Red Hat RHCT/RHCELPI (Linux Professional Institute)CLP/CLEUnix Certifications
  • Installing Linux - A Topics to CoverCase ScenarioIdentify Proper HardwareMethods for installing LinuxLinux Multimedia OptionsDetermine a purpose for the Linux machine
  • Installing Linux - BTopics to CoverConfiguring Linux File systemsConfiguring Boot ManagersConfiguring Network OptionsConfiguring Linux InstallationParametersInstall
  • Identify Proper Hardware for InstallationLinux + Objective covered:1.1 Identify all system hardware requiredand check compatibility with Linuxdistribution.CPUMemoryDrive spaceScalability
  • Things to consider first before proceeding. Workstation Linux Appliances Devices and device drivers in Linux Text vs. Graphics installation requirements Fedora Linux CPU platforms-o i386o x86_64o ppc
  •  Memory requirements Hard Disk requirementso sizeo speed & interfaceo controller Hard disk requirements vs. partitioning Scalability of Linux and of Hardware
  • Sample compatibilityLinux fedora . Red HatSite:http://fedora.redhat.com./docs/release.notes/fcX86 specifics for FedoraThis section covers any specific information youmay need to know about Fedora Core and the x86hardware platform.
  • X86 Hardware RequirementsIn order to use specific features of fedoracore 5 during or after installation, you mayneed to know details of other hardwarecomponents such as video and networkcards.
  • X86 Hardware RequirementsCPU specifications:Intel processorsAMDCyrixVIA
  • CPU Fedora core 5 is optimized for Pentium 4 CPU’s , but also supports earlier CPU’s such as Pentium , Pentium pro, Pentium II, Pentium III and compatible AMD and VIA processors. Recommended for text-mode: 200 MHZ Pentium-class or better Recommended for graphical: 400 MHZ Pentium II or better
  • CPU AMD64 processors (both Athlon64 and Opteron) Intel processors with Intel @ extended memory 64 Technology (Intel EM64) Minimum RAM for text mode 128mb Minimum Ram for Graphical 192mb Recommended for Graphical 256mb
  • Hard Disk Space Requirements In practical terms, additional space requirements may range from as little as 90mb for a minimal installation to as much as an additional 175mb for an “ everything ” installation . The complete packages can occupy over 9Gb of disk space.
  • Determine Installation MethodAppropriate method of installation based onenvironment (e.g., boot disk, CD-ROM ,network ( HTTP,FTP,NFS,SMB).You must boot Linux to install Linux , cannotbe done from windows or other OS. However,some distributions have programs that beginthe Linux install from other OS.
  • Determine Installation Method #1 most popular install method is CD When downloading , there are options to create a Linux boot floppy from DOS. Some older BIOS versions don’t support CDROM boot. DVD-ROMS are also an option(SuSE) Another options is a network installation or hard disk partition installation.
  • Determine Installation Method Running Linux from a CD , without ever installing, is an option . see ( www.slackware.com) Downloading LinuxMethod of interaction installationo GUIo Texto Scripted
  • Install Multimedia optionsInstall Multimedia optionsVideoSoundCodecs
  • Install Multimedia options When run in Text mode, Linux works with just about any video card available. When run in graphics mode, you need to be very careful what video card you are using to run Linux. Specifically you should check the compatibility of the XFree86 and X.org-X11 server with your video card. You can do this by going to these websites:o wwww.xfree86.orgo www.x.org
  • SoundsAbout sound cards, Linux supports mostsound cards. The standard Linux kernelincludes two sets of sound drivers.OSS ( Open Sound System)ALSA (Advanced Linux Sound System)
  • CodecsCodecs are computer programs thatcompress or decompress audio or videostreams. You may have to download codecsfrom the internet to support certain audio orvideo types.
  • Identify purpose of Linux machine Based on predetermined customer requirements (e.g., appliance, desktop system , database , mail server, web server, etc.) Determined what software and services should be installed (e.g., client applications for workstation, server services for desired task)
  • Objective and Purpose What will this machine be used for? In windows, this is usually pretty cut and dry but not so in Linux. Any system can be a workstation or server based on the installed applications. Most all server applications are included in the standard Linux distribution.
  • Objective and Purpose Your requirements will determine what is installed and the hardware selected. When we install Linux, you will see the variety of applications available and how can easily install all or selected applications &application pieces.
  • Partition according to pre- installation plan using Fdisk / boot / usr / var / home Swap RAID/volume Hot-spare lvm
  • Partition according to pre- installation plan using Fdisk Unlike windows were the entire OS is inside one partition (and usually just one directory, the Linux OS is , typically , more spread out. In windows, a partition corresponds with a drive letter (such as C: or D:, etc) Partitions are logical disks carved out from the physical disk.
  • Partition according to pre- installation plan using FdiskLinux typically uses the PC partitioningsystem, made up of 3 partition types:Primary PartitionExtended Partition - serves as a placeholder for alogical partition.Logical partition - resides in an extended partition
  • Linux partition To Linux, these partition types don’t mean a lot . Primary and extended partitions are numbered 1 – 4 (such as / dev /hda1) and logical partitions start at 5 and go up. The master boot record (MBR) is where the partition table is stored. Boot loaders ( which we will discuss later, are also stored in the MBR.
  • Linux partition The minimum partition necessary for Linux is the root, or /,partition. The difference between the / (root) directory and the /root directory
  • Linux partitionWhen installing Linux , you will be asked ifyou want to automatically partition your diskor manually partition the disk.LVM – the Logical Volume Manager isn’t aprogram but design to allow flexibility of diskmanagement .
  • Linux partitionTo understand LVM, you must understandthe following:Physical Volume: a physical volume (PV) isanother name for a regular physical disk partitionthat is used or will be used by LVM.Volume Group: any number of physical volumes(PV’s) on different disk drives can be lumpedtogether into a volume group (VG).
  • Linux partition Logical Volumes: Volume Groups must then be subdivided into logical volumes. Each logical volume can be individually formatted as if it were a regular Linux partition. A logical volume is, therefore, like a virtual partition on your virtual disk drive.The LVM is the disk management design that provides great flexibility of disk management.
  • Linux “fdisk” Linux has a tool called fdisk that can be used to partition your disk. However, when installing in GUI mode, you wont be using this tool. The Linux fdisk program is named after the DOS fdisk program but the Linux fdisk program has more functionality.
  • “fdisk”Commonly, certain directories are split intotheir own file systems. They are:/boot- /boot holds critical boot files and is typically5-50MB in size./usr- /usr holds most Linux programs and istypically 500MB to 6GB in size./var- /var holds files that can are variable in sizesuch as log files and mail queues. It is typically100MB to 200Gb in size.
  • “fdsik” /home - /home holds users home directories but not the root user’s home directory./home is usually 200MB to 200GB in size. Swap – the swap file system is not a mounted partition. Swap is used to help out the system when not enough RAM is available. The swap partition is usually 1.5 to 2 times the system’s RAM size.
  • “fdsik” /usr/local – holds programs that are unique to this system specially compiled programs. /usr/local is usually 100MB to 3GB in size. /opt – holds 3rd party programs and files (usually commercial programs). It is about 100 MB to 3GB. /tmp –hold temporary files and is usually 100MB to 200GB. /mnt and /media –aren’t partitions but are used as mount points for removable media.
  • RAID VolumesRAID( Redundant Array of Inexpensive Disk)Is when the operating system or a hardwarecontroller is creating multiple pieces of thesame data for redundancy or for performance.There are different levels of RAID.RAID can be configured at installation time butis not for the new Linux user.
  •  Hot-spare- a hot-spare is a disk is used with RAID. It is configured such that if a disk is drive goes out, the data that was stored on that disk is copied onto the redundant disk (the hot-spare) and the hot-spare resumes the job of the disk that failed.
  • Configure File SystemWhen you create a partition, you format thatpartition and put a file system on it.The type of format is selected by theadministrator you generally, have threechoices in Linux:(ext2)(ext3)REISER
  • Configure File System Ext2 – the original Linux file system type, it works fine but if the computer is not properly shut down , it can take a long time to be checked when the computer reboots.
  • Configure File System Ext3 – ext3 solves this improper shutdown and checking problem because it provides journaling. Journaling is a feature that keeps a record of changes to a file system so that checking it is very fast after an improper shutdown. Ext3 is the most popular type of Linux file system.
  • Configure File System REISER – a Linux file system type that provides journaling as popular as ext3.NOTE:o that there are other types of file system formats for Linux.o that the swap file system is not mounted and is not one of these types of file systems.
  • Configure a Boot loader A boot loader is what loads Linux into memory when the system starts. If all you do is run a single copy of Linux on a server, you will still use a boot loader but probably never have to configure one or even think about it. However, if you run more than one copy of Linux or want to be able to choose which Linux kernel to run, or run different operating systems , besides Linux , you will need to configure a boot loader.
  • Boot LoaderLILO – stands for Linux LoaderLILO and GRUB are the most commonLinux boot loadersELILO – the EFI LILO boot loader, usedto boot 64bit Linux machines.GRUB – stands for Grand UnifiedBoot Loader. GRUB was the first bootloader to boot above 1024 cylinder.
  • Boot Loader The biggest benefit to boot loaders is: Being able to run multiple operating systems(example: Linux & windows or fedora Linux SuSE Linux) Being able to run multiple kernels on the same machine.