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Xen dom0 not enough free loop devices when trying to start a new domU or when trying to "mount -o loop" from the cmdline

Linux "loop" module has max 8 loop devices (/dev/loop*) as a default. Every Xen "file:" backed domU disk uses one loop device in dom0, and if you do "mount -o loop disk.img /mnt" in dom0 that uses a loop device aswell.

You can check all the loop devices in use by ...

How to install XEN of higher version than 3.3.0 on CentOS5.x

In my case basic OS CentOS 5.4 x86_64 was used.
Browse to http://www.gitco.de/repo/ and grab the needed repo file for your arch and put it into /etc/yum.repos.d. (in this case x86_64).

In case a repo file you need doesn't exist but the folder with this version exists on this repository, then you may simply download any of repo files and change its entry.
Suppose ...

Good alternative to the native built-in GUI (if any) and CLI interfaces is SuperMicro IPMIview utility, which you can download from the official SuperMicro site:
Linux: IPMIView_V2.10.2_bundleJRE_Linux_x64_20150203
IPMIview user`s guide:
IPMIView20.pdf version 2.9

IPMI on linux-based server

Running IPMI on Linux
What is IPMI?

IPMI is standard which allows remote server management, primarily developed by Intel. IPMI cards, known as Baseboard Management Cards (BMCs) are primitive computers in their own right and are operational all the time, so long as the server has a power source. The server itself does not need to be powered on, or the operating system operational for the BMC to work, it just ...

In case you need to perform re-installation of OpenSSH on the server with OS FreeBSD and cPanel you may do it by installing it from the ports. Just do the following:

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ln -s /etc/rc.d/ /usr/etc/rc.d
cd /usr/ports/security/openssh-portable
make PREFIX=/usr ETCSSH=/etc/ssh install


To trace the work of the SSH daemon you may run in console of the server:

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/usr/sbin/sshd -ddd -p 65535

After that you will need to connect to the server using port ...

You need to install plugin called yum-downloadonly. This plugin adds a --downloadonly flag to yum so that yum will only download the packages and not install/update them. Following options supported by this plugin:

--downloadonly : don't update, just download a rpm file
--downloaddir=/path/to/dir : specifies an alternate directory to store packages such as /tmp

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yum install yum-downloadonly

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yum update -y --downloadonly

Method # 2: yum-utils.noarch Package

yum-utils is a collection of utilities and examples for ...

Use dd command to create swapfile. Next you need to use mkswap command to set up a Linux swap area on a device or in a file.

1. Use 'fallocate' to create swapfile of desired size:

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fallocate -l 2G /swapfile

Or use 'dd' create 2048MB swap file (1024 * 2048MB = 2097152 block size):

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dd if=/dev/zero of=/swapfile bs=1024 count=2097152

2. Adjust permissions

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chmod 600 /swapfile

3. Set up a Linux swap area:

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mkswap /swapfile

4. ...

The first thing to try is to boot into single user mode. This may not work, because your system might be configured to still ask for a root password to get to single user mode.
If that's the case, use another trick that replaces init with /bin/bash.

First, try single user. If you don't see either a LILO or GRUB boot screen, try hitting CTRL-X to get one (also ESC key can be used).

If ...

Staggered MySQL Dump Importer

Staggered import of large and very large MySQL Dumps (like phpMyAdmin 2.x Dumps) even through the web servers with hard runtime limit and those in safe mode. The script executes only a small part of the huge dump and restarts itself. The next session starts where the last was stopped.

Download BigDump script