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Posts Tagged with "rhel"

  • Data and Technology, Highlights

    Posted on August 5th, 2008

    Written by cliff

    Tags

    bare metal, linux, restore, rhel, RHEL4

    Bare Metal Linux Restore

    Bare Metal Linux Restore

    Several weeks ago we started seeing some pretty scary errors showing up on the main system disk for our Blackboard server. We had an extra server hanging around, so we decided to move all the data off the failing disk and onto our spare server. The only question was how to make the new server [...]

  • Data and Technology

    Posted on March 17th, 2008

    Written by cliff

    Tags

    10G, database, kernel, linux, oracle, parameters, preinstall, profile, requirements, rhel, sysctl

    RHEL System Configuration Changes for Oracle 10G

    RHEL System Configuration Changes for Oracle 10G

    Below is a list of RHEL system configuration changes that Oracle 10G requires before it is installed.
    First, check the following kernel parameters using the commands below:

    /sbin/sysctl -a | grep kernel.shmall
    /sbin/sysctl -a | grep kernel.shmmax
    /sbin/sysctl -a | grep kernel.shmmni
    /sbin/sysctl -a | grep kernel.sem
    /sbin/sysctl -a | grep fs.file-max
    /sbin/sysctl -a | grep net.ipv4.ip_local_port_range
    /sbin/sysctl -a | grep net.core.rmem_default
    /sbin/sysctl [...]

  • Data and Technology

    Posted on January 11th, 2008

    Written by cliff

    Tags

    data, disk, ext3, filesystem, gnu, IT, linux, mkfs, parted, partition, red hat, rhel, servers, storage, technology

    How to Make Gnarly Big Linux Filesystems

    At least in RHEL 4, the fdisk command does not support the creation of filesystems larger than 2TB. In order to get around it, you have to use the parted command. I found the basic info here, but this is the long and short of how to cut off a big ol’ slice of disk [...]

  • Data and Technology

    Posted on July 25th, 2007

    Written by cliff

    Tags

    add user, cli, command line, computerr, linux, remember, rhel, server, syntax, unix, user, useradd

    RHEL useradd Syntax

    Unlike other flavors of UNIX, RHEL does not have a command like adduser which walks you through the process step-by-step, so you have to remember the four flags useradd requires, and in what order it expects to receive them. Since I don’t manually add users unless I’m installing a new server, I don’t run the [...]

  • Data and Technology

    Posted on June 12th, 2007

    Written by cliff

    Tags

    64bit, beta, computer, core duo, development, filesystem, liinux, mac, macintosh, macintosh virtualization, parallels, product, product review, review, rhel, RHEL5, snapshot, virtual computing, virtual machine, virtualization, vmdk file, vmware, vmware fusion, vmware fusion review, xeon

    VMware Fusion Evaluation

    Since much of my job involves rolling out Linux solutions I’ve been experimenting with VMware Fusion Beta for the Macintosh in my development environment. Given that the product is still in beta, I have very few complaints about its actual stability. Most of the features work reliably as advertised, but there are some basic points [...]

  • Data and Technology

    Posted on April 30th, 2007

    Written by cliff

    Tags

    attacker, authentication, edit, incoming, linux, networks, PermitRootLogin, red hat, rhel, root, root logins, security, ssh, sshd, sshd_config

    Disable SSH Root Logins on RHEL

    For one reason or another RHEL does not disallow incoming ssh connections as root. This is, of course a glaring security problem which should be addressed for all systems that allow ssh connections to be made from any but the most restricted networks.
    The best practice, of course, would be to make the initial ssh connection [...]

  • Data and Technology

    Posted on April 11th, 2007

    Written by cliff

    Tags

    active directory, ad, authconfig, authentication, directory, domain, ldap, linux, nsswhich.conf, open ldap, openldap, PAM, passwords, rhel, samba, smb.conf, users, winbind, winbind authentication

    RHEL Winbind Authentication Against Active Directory

    So you have a RHEL system and you want to authenticate it against your active directory. The good news is that Red Hat has made it easy for you to do this. The bad news is that they only get the most basic structure working for you. Here I will show you how to get [...]

  • Data and Technology

    Posted on February 16th, 2007

    Written by cliff

    Tags

    autoneg, autonegoation, commands, ethtool, hardware, ifconfig, link, link speed, linux, linux commands, rhel, RHEL commands, sysadmin, systems administration

    IFCONFIG Does Not give You Link Status; ETHTOOL Does

    For some reason that is a complete mystery to me, RHEL does not give you the link status when you run # ifconfig -a. This makes it incredibly hard to debug link integrity issues! Buried amongst all of Red Hat’s proprietary commands, however, is a utility called ethtool, which does give you the status of [...]

  • Data and Technology

    Posted on February 6th, 2007

    Written by cliff

    Tags

    180 days, disable fsck, ext3 filesystem, filesystem check, fsck, linux, rhel, storage, twenty mounts

    How to Disable Automatic FSCK on EXT3 Filesystems

    The e2fsck will regularly force a check of a filesystem even if the filesystem is marked clean. By default, this happens on every twenty mounts or 180 days, whichever comes first.
    The ext3 filesystem does this as well, which can be annoying if you have a very large filesystem and a short downtime window. Therefore, it’s [...]

  • Data and Technology

    Posted on December 19th, 2006

    Written by cliff

    Tags

    atomic clock, chkconfig, clock, date, internet time server, linux, ntpd, ntpdate, red hat, rhel, sysadmin, system clock, systems administration, time of day, time server, unix, xntpd

    Getting ntpd to work correctly on RHEL

    Getting ntpd to work correctly on RHEL

    When many new servers are delivered from the factory, the system clock is way off. Most UNIX systems run “ntpd” to keep the time in sync with internet time servers, which are, in turn synchronized against an atomic clock. This results in a system time that is very very close to the “actual” time of [...]

  • Data and Technology

    Posted on December 15th, 2006

    Written by cliff

    Tags

    apache, cal, database, email, free, gnu, gpl, groupware, HowTo, httpd, ical, install, install software, ldap, ldif, linux, microsoft alternative, ms outlook, open ladap, open source, opengroupware, opengroupware.org, openldap, outlook, package, php, php_postgresql, PostgreSQL, rhel, rpm, skyrix, syadmin, systems administration, unix, web

    Installing OpenGroupWare 1.1.5 on RHEL 3

    OpenGroupWare is an open source groupware package intended as an alternative to proprietary applications such as Exchange and PostPath. It is fairly robust in its feature set, and even integrates well with MS Outlook.
    Its strongest points, in my opinion are that it does not depend in any way on Active Directory, and that it [...]

  • Data and Technology

    Posted on December 6th, 2006

    Written by cliff

    Tags

    auto.master, auto.misc, autofs, automountd, backups, chkconfig, computer, daemon, HowTo, intr, linux, mount options, mountd, mounts, network, nfs, options, overhead, rhel, server, service, soft, storage, unix

    Setting Up The Automounter Service on RHEL

    Setting Up The Automounter Service on RHEL

    Mounting filesystems in RHEL is pretty straightforward and easy. Occasionally, however, you will not want the filesystem to remain mounted all the time, but rather to automatically mount for a set period of time only when it is needed. Because of networking overhead, and the general unreliability of networks, NFS mounts are a good [...]

  • Data and Technology

    Posted on November 28th, 2006

    Written by cliff

    Tags

    computer, database, disk, disk label, e2label, fstab, label, linux, partition, rhel, server, storage, systems administration

    Working With Disk Labels in RHEL

    Working With Disk Labels in RHEL

    When you install RHEL, the filesystems are labeled for you. Usually you won't have to mess with it anymore, but on occasion, you may want to change them to more accurately represent the data that is stored on that partition. If, for instance, you used to have all of your database files on a partition [...]

  • Data and Technology

    Posted on November 15th, 2006

    Written by cliff

    Tags

    chkconfig, chkconfig --list, chkconfig sshd, disable, enable, HowTo, linux, network, rhel, runlevels, scripts, servers, services, sshd, startup scripts, sysadmin, systems administration

    Controlling Services With chkconfig

    Controlling Services With chkconfig

    Many system 5 UNIX variants use scripts in the /etc/rcN.d/ directories to control which services should be started in the various runlevels. If, for instance, you wanted the secure shell daemon to run in runlevel 4, you would put a script named something like "S55sshd" in "/etc/rc4.d". This script would usually accept the "start" "stop" [...]

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