Lik`s forum

You can check server current tracked connections with the help of the following command (as root):

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cat /proc/sys/net/ipv4/netfilter/ip_conntrack_count

or

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wc -l /proc/net/ip_conntrack

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cat /proc/sys/net/ipv4/netfilter/ip_conntrack_max

If you want to adjust it, just run the following as root:

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echo 131072 > /proc/sys/net/ipv4/ip_conntrack_max

To make this persistent you have to add a line like 'net.ipv4.ip_conntrack_max=131072' to /etc/sysctl.conf.

http://rackerhacker.com/2008/01/24/ip_conntrack-table-full-dropping-packet/#comment-15408

Some readers may be interested to know what ip_conntrack is in the first place, and why it fills up. If ...

XCP 1.0 is the first full release of the Xen Cloud Platform.
http://www.xen.org/download/xcp/index_1.0.0.html

Question
I have an X8xxx series board with IPMI. Can I set the IPMI port (dedicated vs. shared with lan1) via BIOS or motherboard jumper setting?

Answer
IPMI can use either dedicated or shared. This has to be done either through Web GUI or through IPMI RAW command. It cannot be done through BIOS or jumper settings.

From Web:
Configuration -> LAN select -> Select LAN port

Using IPMI RAW command user can get ...

The magic SysRq key (System request (often abbreviated SysRq or Sys Req)) is a key combination understood by the Linux kernel, which allows the user to perform various low level commands regardless of the system's state. It is often used to recover from freezes, or to reboot a computer without corrupting the filesystem.

To be able to use this functionality the CONFIG_MAGIC_SYSRQ option has to be enabled at kernel compile time.

Much like Sun Microsystems's ...

There are occasions when you want to capture packets using tcpdump rather than wireshark, especially when you want to do a remote capture and do not want the network load associated with running Wireshark remotely (not to mention all the X traffic polluting your capture).

However, the default tcpdump parameters result in a capture file where each packet is truncated, because most versions of tcpdump, will, by default, only capture the first 68 or 96 ...

In Ubuntu, you can explicitly set a MAC address for your network card.
You can either do it manually (Working with MAC Addresses) or use a package called macchanger (GNU MAC Changer).
To manually change your MAC address, for example, for eth0, you do the following:

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sudo vim /etc/network/interfaces

And then you add following line to end of interface being configured (eth0 in this example):

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hwaddress xx:xx:xx:xx:xx:xx

where xx:xx:xx:xx:xx:xx is the MAC address.
So now ...

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TODO
LSI SAS RAID tools: MegaCLI, MegaRAID Storage Manager, MegaRAID SAS SNMP

http://www.delltechcenter.com/page/Linux+RAID+and+Storage
http://www.bigdbahead.com/?p=574
http://wiki.debian.org/LinuxRaidForAdmins
http://hwraid.le-vert.net/wiki
http://www.lsi.com/Search/Pages/downloads.aspx?k=MegaCLI%20-%20Linux
http://tools.rapidsoft.de/perc/perc-cheat-sheet.html

Determine RAID level:

$raid_level_mapping = array();
$raid_level_mapping = '0';
$raid_level_mapping = '1';
$raid_level_mapping = '5';
$raid_level_mapping = '10';

Source:
http://tools.rapidsoft.de/perc/rs_check ... ss.php.txt
<?php

/**
* PERC5/i RAID check for rs_check package
*
* ...

You can enter into domU using the xm utility:
# xm


Usage: xm <subcommand> [args]

Control, list, and manipulate Xen guest instances.

Common 'xm' commands:

console Attach to <Domain>'s console.
vncviewer Attach to <Domain>'s VNC server.
create Create a domain based on <ConfigFile>.
new Adds a domain to Xend domain management
delete Remove a domain from Xend domain management.
destroy Terminate a domain immediately.
dump-core Dump core for a specific domain.
help Display this message. ...