While configuring the rsyslog, without verifying we hit the semanage command. And result was with error – bash: semanage: command not found . The method is applicable to Red Hat based operating system like RHEL 6 and CentOS 6.
In this tutorial,we will learn how to use yum command to download rpm file without installing in linux system.It was before RHEL 5 arrival, when I used to download the source rpm packages by using up2date -d package-name Now things are changed,in Red Hat based Operating System above version 5.x . We use the yum…
Question : I am newbie in Linux.I have a question,How to read logs which are writing continuously.I am using the Linux CentOS Server and wants to read the mail.log which is filling continuously.I just want to read the logs at the same time,when log file writing is running Answer: To read the file which are…
In this post we will learn about how to save iptables permanently on Ubuntu.When we work on Red hat based Operating system like RHEL and CentOS.We can permanently set the iptables rule in /etc/sysconfig/iptables file . When you work on Ubuntu Operating System,you may find you are only able to set the iptables rule temporarily….
In this article we will learn how to temporarily change the shell after login in Linux. The user can change its shell without doing logoff and restart the machine.For example a user require to change the shell in system to perform various commands.
In this post I am sharing a trick in which we will assign DKIM signature like Sendgrid do.The method is not excatly same but the task can be accomplished.I was getting “no signing table” error.Because of which DKIM-Signature was not attaching in recipient’s email header. My application mailer was using gmail id in from: field…
In this post,I am sharing a useful option with linux grep command.In this tutorial, we will use grep command to show lines after and before the keyword . As a Linux System Engineer, sometimes I get the requirement to print lines above and below of a particular keyword in the file. Generally if you only…
In this tutorial we will learn about, how to install vshell frontend on Nagios Core 4 Ubuntu 12.04 LTS. Nagios vshell is php based web interface for Nagios Core.It is lightweight and easy to customize. To get the details of Nagios Vshell , here is the link. To install vshell frontend on Nagios Core 4…
In this tutorial we will install and configure nagios core 4 on Ubuntu 12.04 LTS. Nagios Core 4 has recently been released,at the time of writing this post Nagios core 4.0.2 was available. Nagios is one of the most popular,reliable and robust Monitoring System.You can find number of plugins to monitor the network and server…
In this tutorial we will learn, how to delete mail queue in Postfix .To clear the mail queue in Postfix, we will use the command called postsuper . Abbreviation of postsuper is Postfix superintendent . postsuper command can only be run by super user of the system eg. root . Postsuper command is used for…
In this tutorial,we will install subversion 1.8 on Ubuntu using apt.We have done this practical in Ubuntu 13.04 and 13.10 version.Generally when you install subversion by using command apt-get install subversion ,it will install the subversion 1.7 .Here we will add the new apt source list for subversion 1.8 . Description: Operating System : Ubuntu…
In this post ,I am sharing the error message ” Another MySQL daemon already running with the same unix socket “. The error found in our own sharadchhetri.com blog while restarting the MySQL server.It is at 6:55 PM IST,I noticed the weird error message on blog,”Error establishing a database connection”.I log into the server and…
In this tutorial we will learn,how to install linux operating system in remote machine with telnet.Sometimes you do not want to keep standing in front of system for installation process.In this practical we will use telnet to install linux O.S in remote machine.We are doing this practical in CentOS 6.5 Install Linux O.S in Remote…
In this post I am sharing a small and useful tip about, how to know last command run successfully in Linux and Unix .The post will explain ,to get the exit status of command used last time. As a System Engineer, sometimes I have to check the success status of last command I run on…
Here in this post,we will learn very useful alias command with examples.In linux and Unix like operating system,mainly we use the alias command to shorten the long command.It is something like instead of writing long command in terminal,you type a few letters on terminal and your desired command get run. To understand the meaning of…