Category: Linux Admin

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Redhat Enterprise Linux Networking Troubleshooting – Quick Reference

  1. Network does not start due to “Device not managed by Network-Manager” error. Generally, this error occurs when the ethernet cable does not connect to the interface well and the interface is not configured properly. The solution for this issue is to ensure the link...

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How to set kernel parameters in Redhat Enterprise Linux and Suse Linux

Setting Kernel parameters permanently in Red hat Enterprise Linux Every time the system boots, the ‘/etc/rc.d/rc.sysinit‘ script is executed by init process. This shell script contains a call to sysctl command and reads the values from /etc/sysctl.conf file as the ones to be set Therefore, any...

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Linux Admin Reference – NTP Configuration and Troubleshooting – Red Hat Enterprise Linux :

NTP stands for Network Time Protocol, and it is an Internet protocol used to synchronize the clocks of computers to some time reference. NTP is an Internet standard protocol originally developed by Professor David L. Mills at the University of Delaware. Time usually just advances. If you have communicating programs running on different computers, time still...

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Linux Admin Reference – Chroot FTP Services in Red Hat Enterprise Linux

A chroot on Unix operating systems is an operation that changes the apparent root directory for the current running process and its children. A program that is run in such a modified environment cannot name  and cannot access  files outside the designated directory tree. Chroot sftp...

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Linux Admin Reference – Configuring Auditd in RedHat Enterprise Linux

Guidelines to Implement Audit Rules: – Consolidate your rules where possible. – The system call rules are loaded into a matching engine that intercepts each syscall that all programs on the system makes. – It is very important to only use syscall rules when you have...

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Linux Admin Reference – FTP/SFTP Services in Red Hat Enterprise Linux

In Red Hat Enterprise Linux 3 or later FTP service is provided by the vsftpd daemon. vsftpd stands for “Very Secure FTP Daemon” and is an FTP server for Unix-like systems. It supports IPv6 and SSL, as well as explicit and implicit FTPS. The vsftpd daemon...

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Linux Admin Quick Reference – Configuration of Syslog and Rsyslog – Redhat Enterprise Linux

In Red Hat Enterprise Linux 3/4/5, the default system log tool is syslogd which is provided by package sysklogd, but since Red Hat Enterprise Linux 6, the rsyslogd became the default. rsyslog package is also provided since Red Hat Enterprise Linux 5.2.

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Linux Admin Reference – Mysql on Redhat Enterprise Linux

MySQL, the most popular Open Source SQL database management system, is developed, distributed, and supported by Oracle Corporation.This article describe the procedure to install mysql and perform initial configuration required as part of many third party application installations.

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Linux Admin Reference – Configuring DM-Multipath for EMC Clariion SAN Storage – Red Hat Enterprise Linux

In Enterprise Linux Environment, External storage often permits devices to be accessed by multiple physical paths. This improves redundancy and availability. SAN environment Red Hat Enterprise Linux provides the device-mapper-multipath component to manage multipath capable storage and to present multipath devices to applications running on the...

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