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13 FAQ tagged "enterprise_linux"

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• How do I enable laptop mode to improve Linux laptop battery life? :

  Q. I’m using Redhat enterprise Linux desktop / workstation operating system with HP laptop. Several Linux distributions have a / script to enable to disable Laptop mode but Redhat misses the script. How do I enable or disable laptop mode on fly?
  A. Modern Linux kernel includes very good support for Laptop mode. It is use [...]

• Redhat / CentOS / Fedora Linux Open Port :

  Q. I’ve Redhat Enterprise Linux 5 server with Iptabeles firewall enabled. By default it is only allowing port 22. How do I open port 80 / 143 / 110 on Linux? I’ve started all services but don’t know how to open port using iptables.
  A. By default iptables firewall stores its configuration at /etc/sysconfig/iptables file. [...]

• Redhat / CentOS Linux list all packages available for installation :

  Q. How do I list all packages available for installation from Internet using Red Hat Enterprise Linux or CentOS 5?
  A. You can yum command and it has option to show a list of all packages that are not presently installed and can be installed via RHN or Internet.
  yum list available
  yum list available [...]

• update-rc.d like command on Redhat Enterprise / CentOS Linux :

  I’m using Debian Linux for last 4 years. I’m not able to find out update-rc.d like command ( install and remove System-V style init script links) on Redhat enterprise Linux (RHEL 5). Can you specify equivalent command for the same task?

• Howto: Backup CentOS / Fedora Linux / Red Hat Enterprise Linux server system :

  Q. How do I backup files and database for the Red Hat Enterprise Linux / CentOS Linux? Currently I’ve MySQL server running on CentOS 5 and Web server and file server using RHEL 5. How do I backup all these servers?
  A. Regular backup is an essential for Linux system. You can take backup on
  => Tape
  => [...]

• Patch and Update Redhat Enterprise Linux / CentOS 5 server :

  Q. Can you tell me how do I patch and update everything on my Redhat Enterprise Linux server 5?
  A. Both RHEL 5 and CentOS 5 use yum command, which is an interactive, automated update program which can be used for maintaining systems using rpm.
  To upgrade server and apply all security patches, pass update option [...]

• Postfix / smtpd : sql_select option missing auxpropfunc error no mechanism available error and solution :

  Q. I’m running Redhat Enterprise Linux 4.5 server along with Postfix and Cyrus mail server. However I’m getting following error in my log files:
  Jun 10 18:00:04 server postfix/smtpd[7280]: sql_select option missing
  Jun 10 18:00:04 server postfix/smtpd[7280]: auxpropfunc error no mechanism available
  How do I fix this error? I’m not using mysql for postfix.
  A. The cyrus software comes [...]

• Redhat Enterprise Linux (RHEL) install ImageMagick RPM for manipulating images :

  Q. How do I install ImageMagick software under Redhat enterprise Linux version 4 update 5?
  A. ImageMagick is an image display and manipulation tool for the X Window System. ImageMagick can read and write JPEG, TIFF, PNM, GIF, and Photo CD image formats. It can resize, rotate, sharpen, color reduce, or add special effects to an [...]

• Howto install duplicity rpm under RedHat / CentOS / Fedora Core Linux :

  Q. I would like to use duplicity package to automatically encrypting and storing remote backups in a bandwidth efficient manner in our backup server. The server is already configured and I’d like to install the same under RedHat Enterprise Linux. How do I install duplicity w/o compiling from source code?
  A. Duplicity is a piece of [...]

• Install PHP 5 in Red Hat Enterprise Linux 5 :

  Q. I saw your earlier article about how to install PHP 5 under Red Hat Enterprise Linux version 4. But I’m using Red Hat enterprise Linux 5 and I don’t want to mess up with old version instructions. Is there a way that I can install PHP5 under RHEL 5 without using source rpm?
  A. Redhat [...]

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