Building Linux Clusters

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For instance filesystems and user quotas both deal with filesystems. To work properly, RAID1 needs two or more disks, and zero or more spare disks. The advent of distributed denial of service tools, which can trigger hundreds of these remote back doors simultaneously, has upped the ante so dramatically that it is no longer an overstatement to say that going online with an insecure machine makes one, at the very least, rather an irresponsible netizen.

The Complete Guide To Linux System Administration

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In addition to a great career working with Linux technologies, Jay also has a YouTube channel, available at LearnLinux.tv, where he posts instructional tutorial videos demonstrating how to utilize Linux and open-source technologies. Using a VPN helps you save money by using the public Internet instead of making long–distance phone calls to connect securely with your private network. Display brief info on a bash (shell) build-in command. A subshell is a complete Bash session (another kernel process, in fact) created each time you invoke a script.

Learning Shell Scripting with Zsh

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N Introducing basic security principles N Thinking about security as loss prevention N Understanding the cracker mind-set N Formulating a security policy N Finding additional security resources N Creating a recovery plan “Security isn’t a tangible thing, it is applied psychology.” Alec Muffett, author of the crack password cracking program BEFORE DIGGING INTO the practical, nuts and bolts, how-to, hands-on elements of system security, you need to understand the underlying principles of system security.

Oracle Database 10g Linux Administration 1st edition by

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Click on the piano keyboard on the left of the matrix to preview the note, then click in the matrix to add notes. More generally, a user privilege specification takes the form Note that the runas alias is not required and that you can specify multiple command aliases in the same entry if each is separated by a comma. Conversely, the rule deny kwall 127.0.0.1 prevents the user named kwall from logging in if the source connection is 127.0.0.1.

The Logstash Book

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Change the names of the mail servers, too. #incmail root@localhost #mailfrom anonupload #mailserver primary.mail.server backup.mail.server 321 Administering WU-FTPD with KWuFTPd For those who prefer graphical administration tools, Red Hat Linux installs KWuFTPd, a KDE-based tool that offers an attractive, reasonably complete interface for configuring WU-FTPD. Similarly, -u euid, -U uid, and -G gid, limit the output to processes whose EUIDs, UIDs, and/or GIDs, respectively, match euid, uid, and/or gid, respectively.

Linux Administration: A Beginner's Guide, Seventh Edition by

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See also Red Hat Network defined, 51 groups, choosing during Red Hat Linux installation, 51–53 listing installed, 54, 56, 67–69 registering with Red Hat Network, 406–407 packet sniffer (tcpdump), 256, 331, 357, 441, 740–741 packet-filtering firewall, 182, 268, 359, 762–765 packets, 124–125, 572–573 paging, 38, 491 PAM (Pluggable Authentication Module), 237, 305, 717, 720 PAP (Printer Access Protocol) configuring, 241, 244–246 syntax, 248–249 testing, 248 papd, 241, 244–246 papd_run, 238 papstatus, 247 parallel port, 87, 439, 775 parameters, hardware and software, 113–114 parentheses, 506, 507 partition backing up entire, 622–623 boot choice, 44 creating with KickStart, 64–65 removing with KickStart (clearpart command), 59 root (/) directory, 72–73 selecting, 41–42 setting up, 41 viewing, 89, 566–567 partition tables, initializing invalid with KickStart, 67 partitioning basic, 36–42 file system, 88–91, 473–474 layout, common, 568 problems, 774–775 tailored, 35–36, 65 x86 personal computer (PC), 89 passphrases, Tripwire, 754 password aging, 585, 604–605 basic input/output system (BIOS), 708 continued password continued groups, changing, 597, 598–600 guessing, 710–711 Internet services, less secure, 256–258 multiple, changing simultaneously, 470–471 multiple users, changing, 592 Red Hat Network, 405, 418 security, assessing, 693 setting or changing (passwd command), 465, 468, 469, 585–588, 591–592 social engineering issues, 699–700 theory and practice, 716–720 user, allowing to change, 580–581 password, root, 48, 66 password authentication configuration, 49–51, 56, 57 database, sharing across NIS (Network Information Service), 185, 190, 194–195, 203–204, 206–207 FTP (File Transfer Protocol) services, 312, 314 password daemon, NIS (Network Information Service) server, 194–195 password file encrypting, 254–255 Microsoft networks, configuring, 213 PPP (Point-to-Point Protocol) server, configuring, 143 password policy, 21, 22 password security host-based security, 715–725 logins, tracking, 722–723 logs, checking, 723–725 password generators, 720–722 threats, 715–716 patching kernel, 430–433 security, 24 path names backups, 640 Bash pattern-matching, 518–519 paths adding, 94, 96 Apache Web server, configuring, 382 DNS (Domain Name System), 282 FTP (File Transfer Protocol), 315 Microsoft Network, configuring, 214 NFS (Network File System) servers and clients, using same, 158 pattern matching operators, 518–520 processes, halting, 488, 489 pax tool, 636–638 PC (personal computer) components bus, 28 CD-ROM drive, 30 CPU (central processing unit), 28 drivers, need for, 27–28 floppy disk drive, 29–30 hard drive, 29 hardware, checking for supported, 31 keyboard and mouse, 30 memory, 28 network card, 30–31 redundancy, 23 SCSI (Small Computer System Interface) controller, 30 sound card, 30 video card and monitor, 29 PCI (Peripheral Component Interconnect) bus, 28, 59 modem card, 778 PCMCIA/CardBus, customizing kernel, 438, 446–447, 450 PDP-11, 74 peer-to-peer networks, client/server versus, 14, 17–18 Pentium processor, 28, 437–438, 458 percent sign (%), 515, 518, 519 performance, monitoring CPU (central processing unit) usage, tracking, 568–571 disk usage, 563–568 list of suspects, 551–552 memory utilization, 558–563 network traffic, 572–574 problems, diagnosing, 552–553 running processes, 556–558 System Administrator, 9 system status, overall, 553–556 performance tuning NFS (Network File System), 158, 174–175, 176–179 System Administrator, 9 peripheral.

Kali Linux Network Scanning Cookbook by Justin Hutchens

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The file is divided into stanzas: The auto stanza defines the interfaces that should be automatically initialized when the system boots up. Time spent with the man pages for sudo and /etc/sudoers is richly rewarded. Click the TCP/IP listing for the network card in the Network Properties window. 2. Shutting the computer down will ensure that all of the programs and apps you've opened, as well as those lingering in the background, stealing valuable computer resources, are wiped out entirely.

[(Red Hat Linux Networking and System Administration )]

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Over the next few months, we will explore the tasks that make up Linux system administration. N --enableldap — Turns on LDAP support in /etc/nsswitch.conf, allow- ing your system to retrieve information about users (UIDs, home directories, shells, and so forth) from an LDAP directory. Windows and Microsoft Update only do a handful of Microsoft applications. Ok, time to reboot the server and begin restoring the data. For more, see Run Internet Explorer on Linux by Brian Smith Oct 11, 2007.

A Network-Transparent, Retained-Mode Multimedia Framework

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Our search engine recommends and warns our users: Don't Compromise! Once a function has been defined, you can use it on the command line or in a script. Through transfer agreements and institution partnerships, graduates of this Seneca College program may be eligible for credit at various post-secondary institutions. Figure 17-5 shows the configuration help for the sole option in the Code maturity level options dialog box.

Arch Linux Handbook 3.0: A Simple, Lightweight Survival

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When the operating system needs to access anything in the swapped-out data, it has to find something else to swap out and then it swaps in the required data from disk. You must use one of the these commands to specify what type of KickStart is being done: Install from the NFS server specified. You can invoke it using one of the following forms: The first form uses the -s option to display the size in (blocks) of the disk partition specified by partition and then exits.

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