|
||||||
  |
Advisory: Range header DoS vulnerability Apache HTTPD 1.3 2.x CVE 2011 3192. Exploit is in the wild! Be warned! UPDATE: Apache 2.2.20 has been released and it fixes this vulnerability. Update ASAP! Please note that on Ubuntu the fix has been backported to Apache 2.2.14-5ubuntu8.6 for 10.4 LTS, and 2.2.8-1ubuntu0.21 for 8.04 LTS. ((enjoy)) Ubuntu 11.10′s Unity Dash is taking shape – The H Open Source: News and Features. Ubuntu 11.10 looks really promising! ((enjoy))
Finally someone at Phoronix has found the reason of the greater power usage of the latest Linux Kernel. Kernel Log: BIOS bugs behind greater power use – The H Open Source: News and Features. ((enjoy)) If are using a 64-bit flavour of Linux, you’ll be surely affected by the npviewer.bin issue about random crashes of the Flash Player plugin in Firefox with a message like this in your /var/log/kern.log:
Well, Adobe some time ago released a beta quality 64-bit native Flash Plugin player which seems to work quite well. For example on a recent Ubuntu (mine is 10.04) these are the steps to use it: 1. remove the current plugin:
2. download the 64-bit plugin from the Adobe site: http://labs.adobe.com/technologies/flashplayer10/square/ 3. as root place the extracted file in: /usr/lib/firefox-addons/plugins/ 4. restart your firefox and verify from "about:plugins" that it get loaded correctly You are done! No more npviewer.bin segfault ((enjoy)) If you need to monitor indoor temperature of a server room or similar, the TEMPer Sensor from PCSensor.com may be the right solution for you, at an incredible low cost! You can buy this cheap device from Amazon.com or from e-Bay, plug in the USB port of a server, and with the power of MRTG you will have temperature graphics and email alert. The latest device model shows up as a USB Human Interface Device, while the older was a USB-to-serial. I’ve tested it on a Ubuntu 10.04 physical server, and here are some configuration hints. Perl ModulesUse CPAN for installing required perl modules to use the device: $ sudo apt-get install libusb-dev build-essentials $ sudo cpan Bundle::CPAN $ sudo cpan ExtUtils::MakeMaker $ sudo cpan Inline::MakeMaker $ sudo cpan Device::USB $ sudo cpan Device::USB::PCSensor::HidTEMPer then download a perl script from http://www.cs.unc.edu/~hays/dev/bash/temper/temper_mon.pl to use as a base for MRTG integration. Save the script in /usr/local/bin and modify it to print the data in the format good for MRTG, the last lines of the script should look like this: foreach my $device ( @devices )
{
say $device->internal()->celsius();
}
printf "0\n";
printf "fool\n";
printf "My Temper sensor\n";
MRTG ConfigurationSimply add these lines to your mrtg.cfg to start graphing the temperature data: Target[temper]: `/usr/local/bin/temper_mon.pl` AbsMax[temper]: 50 MaxBytes[temper]: 30 Options[temper]: nopercent,growright,nobanner,nolegend,noinfo,expscale,gauge,noo Title[temper]: My Server Room Temperature PageTop[temper]: <h1>My Server Room Temperature</h1> YLegend[temper]: Temperature C ShortLegend[temper]: °C LegendI[temper]: Temperature °C ThreshMinI[temper]: 15 ThreshMaxI[temper]: 30 Unscaled[temper]: dwmy If you want to use the MRTG threshold feature, add also these lines, and MRTG will send you email alert when the temperatures values are below or over the configured thresholds. # Alert ThreshDir: /var/mrtg/thresh ThreshMailServer: smtp.example.com ThreshMailSender: mrtg-alert@example.com ThreshMailAddress[_]: supporto@example.com Create the /var/mrtg/tresh directory to make MRTG happy. The Min Threshold is also used to detect if the sensor is unplugged since the program will read a value of 0. If you need to purge all the records in the events database of your ZenOSS installation, the simple procedure is the following (tested on Zenoss 2.5.x on Ubuntu server). # /etc/init.d/zenoss-stack stop # /etc/init.d/zenoss-stack start mysql drop the "events" database # /etc/init.d/zenoss-stack stop mysql delete the ibdata1 and ib_log* files in the mysql data folder # /etc/init.d/zenoss-stack start mysql zenoss$ zeneventbuild localhost zenoss zenoss events # /etc/init.d/zenoss-stack stop mysql # /etc/init.d/zenoss-stack start ((enjoy)) The scenario: ESX 4.1 Cluster and a Solaris 10u8 64 bit VM running on RDM Luns. Clone the LUNs at the storage level (a crash consistent cloning) and map them to a new VM configured in the same exact way, same virtual hardware version, same SCSI Controller, same Hard Disk SCSI ID. The problem: the cloned Solaris guest will fail to boot, since for a still unexplained reason the PCI device mapping of the controller has changed and the kernel while booting will be unable to find the disk(s). This is really strange since VMware ESX should provide the same exact hardware to the guest, like in Linux OS guests. Booting in failsafe mode and mounting the root file system on /a should show something like this:
The /devices/pci@0,0/pci15ad,1976/sd@0,0:a is the new device, while on /a/dev/dsk/c1t0d0s0 you can see the broken symlink to the wrong PCI path. The solution: you have to reconfigure the devices inside the cloned guest; unfortunately for Solaris is far more complicated than in Linux OS. 1. Start the VM and at the grub prompt, enter fail-safe mode and allow the root file system to be mounted as read/write under /a. 2. Identify the new device name using the format command. In this case it is /pci@0,0/pci15ad,1976@10/sd@0,0 so replace where necessary from now on. vi may not display correctly so fix the terminal type with the following command:
3. Now edit /a/boot/solaris/bootenv.rc and update the line that starts with setprob boothpath so that it reads:
4. Update the boot archive:
5. Then edit /a/etc/vfstab (making a backup copy first) and modify the line mounting the root file system so instead of /dev/dsk/c1t0d0s0 and /dev/rdsk/c1t0d0s0 it reads the following absolute paths. Do not forget to suffix a: and ,raw respectively.
6. Now we need to force a reconfiguration boot so that the system recreates the /etc/path_to_inst file that contains physical device to logical instance mappings. You can do this in 2 different ways: “touch /a/reconfigure” before reboot or at the grub prompt, I prefer to use grub.
7. At the grub prompt, edit the grub entry thath sould automatically boot with ‘e’ and edit the kernel command line adding -r -s at the end of the line, then press ‘b’ to boot that entry. -r is to force reconfiguration, -s to start in single-user mode 8. Login and edit /etc/vfstab again so that you can replace those absolute paths for the / file system. If you have /var on a separate file system mount it manually to make vi happy. If you made a backup of this file before the last update, it would be easier to start with this. Before you do this use format to determine the new disks and update this file as appropriate. An example with the correct disk paths may be:
9. Reboot again in multi-user mode and you’re done! System is now ready for use. YMMV. Useful links: ((enjoy)) An interesting video attached to this post about the Google Data Centers. http://googleenterprise.blogspot.com/2011/04/security-first-security-and-data.html At around 4:05 you can see something that resemble a tape library (or a TAN I suppose) used for backup puroposes. ((enjoy)) The new Linux Kernel 2.6.38 has been released and has a lot of new exciting features and improvements. |
|||||
|
Copyright © 2012 Guru dell'Eccelso Picco - All Rights Reserved |
||||||
