Feb

25

What is Load average?

Filed Under Linux | Leave a Comment

Recently I monitored one of my servers and started wondering what “Load average” numbers mean:

After long search I found clear explanation here. Here is the summary:

The load average is a number that corresponds to the average number of runnable processes on the system. The load average is often listed as three sets of numbers (as seen here), which represent the load average for the past 1, 5, and 15 minutes

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Jan

2

Virtinstall error

Filed Under Fix, Linux, error | Leave a Comment

When trying to install CentOS 5 in Xen DomU via http I received following error:

“Could not find an installable distribution the install location”

The problem was that instead  pointing to root of folder containing mounted disk images I should point to disk1.

That solved my problem.

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Dec

17

CentOS 4.6 is ready

Filed Under Linux, news | Leave a Comment

You can download it now:

http://isoredirect.centos.org/centos/4.6/isos/

Major changes for this version are:

* samba has been updated to version 3.0.25b. This addresses several
critical issues affecting interoperability with Windows 2003в„ў and
Windows Vistaв„ў (resolved in recent upstream releases).

* autofs5 is included in this release as a Technology Preview. This new
version of autofs resolves several long-standing interoperability issues
in multi-vendor environments.

* There is a technology preview of OpenOffice-2.0 included in the
updates directory. You can install this OOo2 preview alongside the
current OOo-1.1.5 version, or you may install the OOo2 preview alone.
We apologize that this was not included on the ISOs, however it was not
on the upstream ISOs and we followed that layout. To List the new
OpenOffice-2.0 RPMS with yum use this command:

yum search openoffice.org2 | grep i386 | grep -v langpack

For finding Language Packs (if you want other than English) do:

yum search openoffice.org2 | grep langpack

Use “yum install <pkg_name1> <pkg_name2>” to install the packages
that you want, or “yum info <pkg_name1> <pkg_name2>” to obtain more
information about them.

* A new yum included in CentOS-4.6 requires the installation of
yum-metadata-parser. The yum-metadata-parser package contains a
metadata parser for yum written in C. It speeds up the metadata parsing
phase of yum considerably and does not change yum behavior in any other way.

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Dec

8

One page linux manual

Filed Under Linux | Leave a Comment

If you learn Linux so command line looks little bit scary for you.

The solution could be summary of base Linux commands. So you never again wonder what was the command that do……?

Found here

Direct link to the pdf document

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Dec

2

CentOS 5.1 is out

Filed Under Announcements, Linux | Leave a Comment

Finally it is out and until Monday It should be synced to all mirrors with iso’s available for download.

Release notes

If you do not have fast connection you can buy it on CD ot DVD from our store

My Experience

After 450M download (186 packages) here are first problems:

In my setup sysreport package (from rpmforge) conflicted so I just removed it and installation went OK. Later I saw it was replaced by sos package.

New kernel welcomed me with new message:

“Memory for crash kernel (0×0 to 0×0) notwithin permissible range”

To be honest I’ve seen the same message in RHEL 5.1 so I expected it.

Next thing was that redhat-release was still with version 5?

Will wait for day or two before bringing this as bug (it is possible that the repo was no fully synced)

No other problems for now….

After browsing mirrors I was surprised that finally there is netinstall CD.

UPDATE:

“Memory for crash kernel (0×0 to 0×0) notwithin permissible range” is harmless message

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Nov

29

Firefox 2.0.0.10 - Security update released

Filed Under Linux, Windows, news | Leave a Comment

This update is strongly recommended.

It fixes following security flaws:

MFSA 2007-39 Referer-spoofing via window.location race condition
MFSA 2007-38 Memory corruption vulnerabilities (rv:1.8.1.10)
MFSA 2007-37 jar: URI scheme XSS hazard

But this is not all….

When restarting Firefox to apply the update I was surprised with the message that I cannot install the update because I’m not an owner of the file or do not have administrative privileges…..

After several retries I realized that there is another user logged on my PC and it was using Firefox :( after closing this extra copy update was installed and now I use latest version.

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Nov

3

Firefox 2.0.0.9 - Stability update released

Filed Under Fix, Linux, Unix, Windows | Leave a Comment

Update of the update:

The 2.0.0.8 release fixed some 200 issues, but accidentally regressed a few things. Most users won’t see any difference or experience any problems, and those 200 fixes make the 2.0.0.8 update very valuable, but you should never have to choose functionality over security. So we’re working fast to understand and fix these problems, and will shortly be issuing a 2.0.0.9 update to address them. The specific problems are:

  • Bug 400406 - Firefox will ignore the “clear” CSS property when used beneath a box that is using the “float” property. There is a temporary workaround JS/CSS code available for web developers with affected layouts.
  • Bug 400467 - Windows Vista users will get “Java not found” or “Java not working” errors when trying to load Java applets after updating. To fix this, users can right-click the Firefox icon and “Run as administrator”, then browse to a page with a Java applet — doing this once will fix the problem and permanently restore Java functionality.
  • Bug 396695 - Add-ons are disabled after updating. Users can fix this problem by opening their profile folder and removing three files (extensions.rdf, extensions.ini and extensions.cache)
  • Bug 400421 - Removing a single area element from an image map will cause the entire map to disappear. There is no workaround available at this time.
  • Bug 400735 - Some Windows users may experience crashes at startup. There is no workaround available at this time.

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Oct

17

Best use of PlayStation 3

Filed Under Linux, news | Leave a Comment

Recently scientists discovered the power of Sony PlayStation 3.

But not to play games, but to crunch numbers.

Gravity project utilizes 8 PS 3 running Linux - connected in cluster to replace 200 Supercomputer nodes.

Overall, a single PS3 performs better than the highest-end desktops available and compares to as many as 25 nodes of an IBM Blue Gene supercomputer. And there is still tremendous scope left for extracting more performance through further optimization.

Rack of PS 3s

This “mini” supercomputer is used to help measure these theoretical gravity waves - ripples in space-time that travel at the speed of light that Einstein’s Theory of Relativity predicted would emerge when such an event takes place.

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Sep

18

Open directory in terminal from Nautilus

Filed Under Howto, Linux | Leave a Comment

Many users still do it the old fashion style.

  1. Open terminal
  2. CD to the directory

Now the shortcut:

  1. Right click desired folder in Nautilus and choose Open in terminal

It is simpler and saves some typing. Requires that nautilus-open-terminal package is installed.

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Sep

6

How to add Google repository in CentOS

Filed Under Howto, Linux, google | Leave a Comment

Google is adding more apps to his Linux repository.

They also have script to setup repositories, but unfortunately it does not recognize CentOS and yum enabled distribution. I’ve added this code to check if yum is installed:

# Check if yum is installed RHEL v5 and CentOS 4.x and 5
if [ '/bin/rpm -q yum' ]; then
PACKAGEMANAGER=yum

Resulting script is here:

Google repos for centos

NOTE: After downloading the file just rename it from .txt to .sh and run with the shell:

bash google-repo-setup_CentOS.sh

Currently you can find there only picasa and google desktop

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