System Administration


Red Hat Enterprise Linux 6 and its derivative CentOS 6 includes a graphical tool called Firewall Configuration for configuring the firewall options. This article describes how to use the Firewall Configuration tool to open up the ports necessary for providing an email server.

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EPEL (Extra Packages for Enterprise Linux) is a third party RPM repository for Red Hat Enterprise Linux and CentOS. This article describes how to add the EPEL repository in Red Hat Enterprise Linux and CentOS 5 or 6.

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Starting and stopping services is easy in Red Hat Enterprise Linux 6 and its derivative CentOS 6. Both includes the Service Configuration tool which simplifies service administration.

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This article describes how to manage your files in Red Hat Enterprise Linux 5 or CentOS 5.

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Red Hat Enterprise Linux 5 and its derivative CentOS 5, includes tools to configure the network device. This article describes how to configure network devices in Red Hat Enterprise Linux or CentOS 5.

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Before starting to use Red Hat Enterprise Linux 5 or CentOS 5, the static host name table lookup file /etc/hosts must be corrected first. The steps below describes how to do this.

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Services in Linux like cron and kerberos relies on an accurate and synchronized clock. This article describes how to synchronize the system clock with an NTP server.

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Ideally, passwords should be changed regularly. This article describes how to setup password expiration using the User Manager application in Red Hat Enterprise Linux 5 or CentOS 5.

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This article contains useful links on how to administer a Red Hat Enterprise Linux 5 or CentOS 5 server.

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RPMforge is a third party RPM repository for Red Hat Enterprise Linux or CentOS. Adding the RPMforge repository will give you access to an extensive library of precompiled binaries. This article describes how to add the RPMforge repository in Red Hat Enterprise Linux or CentOS 5 or 6.

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