Extract files from an RPM package
RPM (Red Hat Package Management) packages are installation files for Red Hat Linux distributions. They are popular because software is easy to install and remove.
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394 notes on Linux, tools and troubleshooting
Send Ctr + Alt + Del to the guest OS, not dom0
In a guest console, Ctrl + Alt + Del is received by dom0. In RHEL virt-manager, press Ctrl three times, then Alt + Del to send the combination to the guest.
Determined system's CPU(s) can run a fully virtualized guest
To run Xen in fully virtualized mode on Linux, the CPU must support virtualization technology. Check whether your CPU can run in fully virtualized mode…
Make a clone of a virtual guest operating system in RHEL 5
Xen in Red Hat 5 does not include guest OS cloning, but guests can be cloned with dd or LVM snapshots. This article covers the snapshot method.
Find the number of sockets a process currently has open
To find how many sockets a process has open on Linux, first identify its PID using $ ps -aef | grep, then count its sockets.
Create filesystems greater than 2 Terabytes
CentOS/RHEL 5 supports filesystems up to 8 TB, with 16 TB planned for the future. In practice, filesystem creation may stop at 2 TB; this article gives a workaround.
Map Of The Linux File System
Here is a diagram of Linux directories for Ubuntu beginners and users who are unsure where things are stored. Many thanks to Scott Gilbertson of Wired.
View extended information about network connections using netstat?
Use netstat to view network details with the command below. [root@example ~]# netstat -tuanpeeoT Active Internet connections (servers and established) Proto Recv-Q Send-Q Local…
Setup SSH to disable direct root login.
To prevent direct root login over SSH, edit #vi /etc/ssh/sshd_config and set PermitRootLogin to no: PermitRootLogin no. Then restart SSH.