This was posted originally on 2018. Updated few. Why this topic? SSH, secure shell, is a network protocol used to access remote Linux machine. You can execute commands on the remote server by connecting using SSH protocol. SSH, it’s an…
Tag: centos
How to replace a failed harddrive in a software RAID 1 array?
Is it possible to replace a faulty drive from RAID 1? What are the steps? Here I’m explaining the detailed steps in replacing a bad drive from software RAID 1 array. As you know RAID 1 means mirroring. Here I’ve…
What is Semaphore? Why it’s important for a Server Admin?
What is Semaphore? Well, we need a discussion on Semaphore concept under Linux as it plays major role in a Multi Processing System. Some time we need to review the current Semaphore status on the server and need to kill unwanted/unused…
How to rename an already existing screen session?
We already discussed different topics on “screen” command in our previous discussions. You can refer to our previous topics for more details on that. 1) Screen command usage 2) How to access attached screen after connection dropped? The screen command…
How to install dig, nslookup, host commands in Linux
How to install dig, nslookup, host commands on Linux machine? How to install dig on RHEL 6, RHEL 7, CentOS 6 / CentOS 7 servers? How to install dig, nslookup, host commands on Debian servers? These commands are very important…
Easy way to uninstall CSF from server
uninstall csf [Config Server Firewall] In our previous post, we explained the steps for installing CSF on a Linux machine. You can refer the below article. In this post we only look into the un installation steps from Linux command…
Analysing mail log details – Exim log file flags a detailed view
How to analyse the mail log details – Exim? To play with email issues we’ve a good knowledge about the log file and different log line flags. We know the basics of exim MTA and its basic commands. We already discussed…