Category: Linux Troubleshooting


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.

Linux Administration Information Center

Booting Tasks Read – Unexpected Server Reboots of RHEL servers on HP Read – Linux Admin Reference – RedHat Linux Grub Loader Storage Responsibilities Read – Understand Device Mapper and DM-Multipath Read – Identifying Disk Errors in Linux Read – Identify if linux was installed on...


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...


Red Hat Enterprise Linux on HP Servers – Unexpected Server Reboots

The Server Environment which has Linux Servers installed on HP, occasionally encounter the issue of unexpected server reboot without any related log in system logs. And There are no kernel panics and no perfornamce issues ( SAR reports the usage utilization is normal) except the below...


Linux Admin Reference – Network Bonding – Redhat Enterprise Linux ( RHEL5 / RHEL6)

  Bonding is a feature that can be enabled bu the Linux kernel, to allow system administrators to combine two or more network interface to form a single, logical “bonded” interface, for redundancy or increased throughput purpose. We can configure Linux bonding in 7 different modes. The behavior of the...


Linux Network Troubleshooting

Network connection problems include slow connections, as well as complete loss of connectivity. Factors that may cause slow connectivity include incorrectly configured domain name system (DNS) settings, inefficiently configured routing tables, inferior cabling, overloaded servers, and network congestion. The same set of factors, as well as...


Network Physical Connectivity Check for Solaris and Linux

Network connectivity checks For the server without OS  ( just Racked hardware and powered up)   For X86 Hardware We have to make LED checks – like when we disconnect the cable at the server side / switch side the Link / Act LEDs should lit...


Redhat Linux : Collect System Diagnosis report for the Support Call purpose

Red Hat Enterprise Linux 4.5 and previous On a default installation the package Sysreport should be already installed. If not you need to install the package “sysreport-.rpm” with the following command # rpm -ivh sysreport-.rpm or, if your system is registered at the Red Hat Network...


Linux Troubleshooting – Root Password Reset

The General problem that we see in an enterprise environment, where there is no centralized automated password management tool is  …. missing root passwords for the servers. Missing root passwords are also common when the servers initially managed by one team and later handed over to...


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