In my day-job all our Linux boxes (bar 3) are Xen VMs. I wanted a way to take a backup of these with out the risk of the files changing underneath. For performance reasons I am running all of them on Logical Volumes. Within these VMs the DomU OS is once again using LVM for [...]

How to view core.xx files in Linux? The core.xxx files are created on Linux servers and holds the current state of a process working memory when a process is crashed. To view the core.xx files in Linux, execute the command: root@host [~]# strings core.xxx It will list different state of a process on each line.

This tutorial shows how to install and configure BASE (Basic Analysis and Security Engine) and the Snort intrusion detection system (IDS) on a Debian Sarge system. BASE provides a web front-end to query and analyze the alerts coming from a Snort IDS system. With BASE you can perform analysis of intrusions that Snort has detected [...]

Resolution Please make sure there are no open files inside a container root and/or private area (and your current working directory is not inside a container root/private area) by running the following command on the hardware node (assuming there is a problem with the container #101): # lsof 2> /dev/null | egrep ‘/vz/root/101|/vz/private/101′ If there [...]

How can I find all the file descriptors used by a process such as httpd (Apache web server) or mysqld (MySQL Database server)? You can use /proc file system or the lsof command to find all the file descriptors used by a process. /proc File System Example Find out process ID using the ps command, [...]

In Unix-style computer operating systems, root is the conventional name of the user who has all rights or permissions in all modes (single- or multi-user). The root user can do many things an ordinary user cannot, such as changing the ownership of files and binding to ports numbered below 1024. It is never good practice [...]

i have been struggling to find some way or another to transfer my file from one linux server to another using commandline. Before this i was just using cpanel to do backups. Here is an easy way to accomplish transferring backup files from one server to another in linux. Just simple command using SCP (secure [...]

SSH service can be secured in various ways like changing the SSH port, changing the ssh protocol,  ssh ListenAddress, disable root login with the PermitRootLogin parameter, allowing ssh access to specific users, restricting SSH access to specific IPs etc. These steps will make sure SSH service on your server is secure. Edit the SSHD configuration [...]

How to check the Linux Server Uptime? There are different ways to check the uptime of the Linux server like using the “top”  OR the “uptime” OR the “w” command. Following are some of them: root@host [~]# top c top – 15:50:20 up 2 days, 11:32, 1 user, load average: 0.00, 0.00, 0.00 root@host [~]# [...]

How to disable root login and create an alternate SSH user? In order to disable root access on your server, you need to create an alternate SSH user who have privileges to gain root access else you will be locked out of the system. First, create a user say  ‘admin’ # useradd admin Set a [...]