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...
Linux Admin / Linux Networking / Redhat Enterprise Linux 6 / Unix Intermediate
by Ramdev · Published June 12, 2014 · Last modified July 2, 2015
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...
Linux Admin / Linux Troubleshooting / Performance Analysis / Redhat Enterprise Linux 6 / Unix Intermediate
by Ramdev · Published June 9, 2014 · Last modified July 23, 2016
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...
Linux Admin / Tools & Applications / Unix Intermediate / Web Servers
by Ramdev · Published May 29, 2014 · Last modified July 2, 2015
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.
Linux Admin / Linux Disk Management / Linux LVM / Unix Intermediate
by Ramdev · Published May 26, 2014 · Last modified July 23, 2016
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...
Solaris 10 Zones & LDOMs / Solaris Admin / Unix Intermediate
by Ramdev · Published April 21, 2014 · Last modified August 6, 2016
This post will help you to gather necessary information required to troubleshoot a LDOM issue. And this post doesn’t cover the actual problem resolution found during the data analysis.
Linux Admin / Linux Networking / Redhat Linux Kernel
by Ramdev · Published March 25, 2014 · Last modified July 2, 2015
This article will introduce several Tunable Parameters, that we can customize for Network Tuning purpose in Redhat Enterprise Linux.
CLOSE_WAIT is the state for the TCP connection after the remote side has requested a shut down(FIN), and the TCP connection is waiting for the local application to close the socket. There is no timeout for a thread in CLOSE_WAIT state. So need to find out...
Unix Intermediate / Veritas Administration for unixadmin / VxVM - How to / VxVM Learning
by Ramdev · Published March 14, 2014 · Last modified July 23, 2016
Below examples will help you to understand Veritas Dynamic Multipathing administration using vxdmpadm. To display the usage message for all vxdmpadm commands, enter: # vxdmpadm help To obtain a usage message for listctlr, use the command: # vxdmpadm help listctlr
Unix Experts / VCS How To / Veritas Cluster Services
by Ramdev · Published March 7, 2014 · Last modified March 1, 2014
The hamsg utility displays the contents of a specified log data file (LDF) in any language supported by VCS. A log data file, <file>.ldf, contains data about messages written to a corresponding English language log, <file>.log. Typically, for every English VCS log file there is a...
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