Open source enterprise software company Red Hat has updated its virtualization platform, Red Hat Enterprise Virtualization (REV), to include support for desktop virtualization, the company announced Monday. more from http://jk.scanmon.com/en
Archive for the ‘linux system’ category
Red Hat Moves Into Desktop Virtualization
March 30th, 2010Minimalist Linux desktops
March 30th, 2010
by Richard Hillesley
Lightweight desktops have a multitude of uses, on netbooks, for mobile devices, for older hardware, for users with limited requirements of their systems, for connecting to applications in the cloud, and for bare knuckled programmers who prefer to work closer to the metal.
Puppy lightweight Linux. 
The most popular desktops for Linux – KDE and GNOME – are are equal to the demands of most users, but if you are a sysadmin or programmer who does most of his or her work in a shell, or on the command line through vim or vi or Emacs, your demands of a desktop environment or a window manager may be relatively limited. A fully-featured desktop environment may, perversely, sometimes get in the way of useful work. For more please visit http://jk.scanmon.com/en
Learn Linux, 101: File editing with vi
March 21st, 2010In this article, learn the basic use of the vi editor, which is almost always available on any Linux or UNIX system. Learn to:
- Navigate a document using vi
- Use basic vi modes
- Insert, edit, delete, copy, and find text
This article helps you prepare for Objective 103.8 in Topic 103 of the Linux Professional Institute’s Junior Level Administration (LPIC-1) exam 101. The objective has a weight of 3.
To get the most from the articles in this series, you should have a basic knowledge of Linux and a working Linux system on which you can practice the commands covered in this article. Sometimes different versions of a program will format output differently, so your results may not always look exactly like the listings and figures shown here.
Learn Linux, 101: Manage shared libraries
March 21st, 2010
In this article, learn to find and load the shared libraries that your Linux programs need. Learn to:
- Determine which libraries a program needs
- Know how the system finds shared libraries
- Load shared libraries
This article helps you prepare for Objective 102.3 in Topic 102 of the Linux Professional Institute’s Junior Level Administration (LPIC-1) exam 101. The objective has a weight of 1.
To get the most from the articles in this series, you should have a basic knowledge of Linux and a working Linux system on which you can practice the commands covered in this article. Sometimes different versions of a program will format output differently, so your results may not always look exactly like the listings and figures shown here. In particular, many of the examples in this article come from 64-bit systems. We have included some examples from 32-bit systems to illustrate significant differences.
Lightweight X11 Desktop Environment
January 28th, 2010LXDE is a GPL licensed open source desktop environment for Unix and other POSIX compliant platforms, such as Linux. The name LXDE stands for “Lightweight X11 Desktop Environment”.
LXDE is an energy saving and extremely fast and performing desktop solution. It works well with computers on the low end of the performance spectrum such as new generation netbooks and other small mobile computers. LXDE is designed for cloud networks such as local freifunk clouds or the global Internet cloud. It can be built on top of various Linux distributions such as Ubuntu or Debian. It provides a fast desktop experience connecting easily with applications in the cloud and supports a wealth of programs, that can be installed with Linux systems locally. LXDE already supports many computer processor architectures including Intel, MIPS and ARM.
The LXDE project started 2006 when Hong Yen Jee from Taiwan, known as PCMan, published the first component PCMan File Manager. Today the LXDE team has grown into an international community of developers, designers and contributors from all over the world.
» Read more: Lightweight X11 Desktop Environment
317 days a computer running the server off the shelf
January 22nd, 2010
一台运行317天的今天服务器下线维护，在次之前该服务器一直负担这服务器集群调度的工作，本来认为这台服务器可以一直运行下去，但是根据公司要换机房的决定，这台服务器只好在机房下架 。 服务器型号 dell 1850 ，运行系统 debian 5 ，运行业务软件 lvs。
A computer running 317 days of today the server downtime for maintenance, in the second until the server has to pay for the server cluster scheduling work, would have thought that this server can be running forever, but the incumbent, according to the company’s decision room, this server had no choice but room off the shelf. Server model dell 1850, operating system debian 5, run business software lvs。
Do cdn china telecommunications Netcom ip address allocation table to download.
January 16th, 2010ScanMon of its Web site because the server is located in California, the china users to access very slow, the network delay in the 200ms or so has come to the ideal state (the United States to China, long distance cross-sea fiber optic cable).
General Telecom / Netcom users to access the U.S. site, the network data transmission, following the route first, the local ISP network, then the metro, followed by provincial and municipal network node, and then the backbone network, the final exit from Shanghai and other out across more than 10,000 kilometers the vast Pacific Ocean, in the United States, California / Oregon landing. Network delay (latency) in more than 200ms. Many people mistakenly believe that GFW’s network filter will affect the speed, but in fact this effect is negligible, the network for more than 200ms delay is mainly because the transmission distance is too long, the Japanese / Australian Internet users against the United States and mainland China network delay the user about the same, while European customers in general across the Atlantic Ocean for more than 100ms. If you are a mobile user, then the two giants for bandwidth resources to be pitiful, mobile users are generally the first south to Hong Kong to connect NTT nodes, and then detour to reach the United States, Japan, Network latency reached a staggering Qi Babai cents seconds.
The help of friends in the test in Beijing, Shanghai and Guangzhou, the speed of access to the site can also be acceptable, but some users have reported speed is still very slow. Because of this issue and therefore lost a lot of customers.
Taking into account these problems, I decided in the domestic planted two nodes, by cdn ways to solve this problem. Cdn need to do a detailed ip address allocation table, to facilitate separation of (Telecom / Netcom); (domestic / foreign), to speed up web site access speeds, allowing users to have better access to results. At a friend’s help, organize A Chinese telecommunications operator (ISP) IP address allocation table.
At present, China mainly domestic ISP Telecom, China Netcom (now merged with China Netcom), mobile (have been consolidated CRC) 3, the largest telecommunications and China Unicom (China Netcom). The north and south of the ISP due to the different, ISP restrictions between the North and the South led to a user’s visit to the site that excruciatingly slow. To solve this problem, the current common practice is to obtain IP addresses operator, by setting the two-wire (multi-line) DNS access to achieving a “Telecommunication walk Telecom, Netcom, Netcom to go” to solve the problem.
» Read more: Do cdn china telecommunications Netcom ip address allocation table to download.
Jacky‘s blog keyword tag cloud
January 11th, 2010
Jacky‘s blog keyword tag cloud
花时间在我的宝贝葫芦上做到标签云：
scanmon.com , jk.scanmon.com , bebian , nginx ,moon52.com ,linux , mysql, 快乐生活 ,apache , jacky ,月影鹏鹏 ，php
schroot – chroot for any users
January 7th, 2010From manpages: schroot allows the user to run a command or a login shell in a chroot environment. If no command is specified, a login shell will be started in the user current working directory inside the chroot.
I’ve been trying some virtual machines solutions to execute some programs 32bits in my machine. But it’s take very time, start a xen VM or virtualbox. Often this solutions needs some maintain additional costs to setup a X server to run any X-based program.
OpenSSH logging with ChrootDirectory
January 7th, 2010Finally following up on the previous article on the subject, I found some time to investigate logging what happens in an internal-sftp session using rsyslog.
Making syslog available in the chroot
Simply create a dev directory in each one of the chosen user chroot directories.
# mkdir /home/user/dev
Configuring rsyslog to probe the new logging source
Simply drop the following contents in /etc/rsyslog.d/sshd.conf :
# Create an additional socket for some of the sshd chrooted users. $AddUnixListenSocket /var/fileserv/dev/log # Log internal-sftp in a separate file :programname, isequal, "internal-sftp" -/var/log/sftp.log :programname, isequal, "internal-sftp" ~ » Read more: OpenSSH logging with ChrootDirectory
