Switch User Unix

In the past, we have introduced some principles of software development, such as the 10 commandments of high quality code and the UNIX design principles described in the UNIX legend (next article). I believe that you can learn from middle school some knowledge of design principles, as I said in the "How Do I Recruit procedures", a good programmer usually consists of its operational skills, knowledge level, experience level and ability four aspects. Here I would like to talk about some of the principles of design, I think these things belong to the long-term experience summed up knowledge. These principles should be understood by every programmer. But...

First, customer description and requirements analysis of a unit to build a server 40 computer room. 　　Room for a total of 5 cabinets, plan each cabinet to put 8 servers, in the room has an administrator operation on all servers, local administrator configuration 1, now need to implement 1 administrator users and 4 ordinary users of all servers for local centralized management. 　　Integrated to the engine room all servers need to achieve local centralized management needs, Qinan-kinan KVM to all of the above requirements to do the following system solutions. Second, the computer room KVM Monitor Management system design plan ...

Simply put, a cluster (cluster) is a group of computers that provide users with a set of network resources as a whole. These individual computer systems are the nodes (node) of the cluster. An ideal cluster is that the user never realizes the nodes at the bottom of the cluster system, in their view, the cluster is a system, not multiple computer systems.     And the administrators of the cluster system can add and revise the nodes of the cluster system at will. Below on the server commonly used three cluster software to do a comparative analysis of the introduction: 1 ...

MapReduce: Simple data processing on large cluster

As cloud computing approaches, IT infrastructure is poised for a storm-like upheaval. Recently, the major server manufacturers frequent movements. EMC, allied to Lenovo last August, announced that it was working with Lenovo to develop next-generation X86 servers, Lenovo's IPDC dedicated servers, new server makers, and sky-cloud, which targets cloud-centric applications, unveiled a "hero" strategy; even IBM Power Bae, the representative of high-end machines, can't sit. , release the "New Power" program, including medium and low-end products included in the upgraded version. Why are these manufacturers ...

By the end of the year, the major companies have to carry out year-end summary and financial liquidation, if the HP's 2014 inventory, Hewlett-Packard Global vice president, China Hewlett-Packard Company group general Manager Jian more willing to use eight words to summarize, namely "growth, innovation, cooperation and landing." That's right! HP in 2014 was the biggest year of change, and it was a fruitful year. In particular, the introduction of HP Fusion system, let us see the key business areas of the most luxurious star-class product lineup. Under the new IT environment, "unmatched user experience" becomes another label for a converged system. Formal this pursuit ...

Open source Hotspot Inventory 1984, Richard Stallman launched GNU and Free Softwarefoundation, which has been open source for more than 28 years. From the bottom of the operating system to advanced desktop applications, there are open source footprint. Linux, which is especially open source operating system, is a controversial issue and is subject to many commercial attacks. 　　Many people like to put open source and business together, to accuse Open source is how "irregular", "energy consumption", "instability" and so on, especially Microsoft. Talk about ...

Six open source monitoring tools which one did you use? Published in 2013-03-15 12:22| Times Read | SOURCE csdn| 0 Reviews | The author Zhang Hong Month open source Monitoring Tool Muningangliagraphitepingdom Summary: This article introduced 6 practical monitoring tools, not only can you monitor the network resources, but also monitor the server, user requests, Web performance, etc., to your site to provide comprehensive,  One-stop guidance and monitoring. If you think the site is built, it's all right.

Intermediary transaction SEO diagnosis Taobao Guest Cloud mainframe technology Hall It is well known that Oracle, IBM, Microsoft, the three major database areas, and still tirelessly launch new products, and constantly enhance its functionality, although the database is only part of their many product lines, but the data as a basis for it, 　　All the efforts to make the data seem so important. Database (DATABASE,DB) is a collection of organized, shared, and managed data that is stored in a computer for a long time. In the traditional sense, the database ...

In 09, IBM announced the latest storage strategy for cloud computing, an application called "Enterprise Intelligent Cloud storage", a private cloud based storage and archiving technology designed to provide application support to enterprise customers. This cloud storage is implemented primarily through storage virtualization. This is in contrast to the existing Low-cost cloud storage application environment offered to customers by EMC and other vendors, with a distinction between two or three-level data replicas or storage applications in development and testing environments. IBM's cloud storage is based on IBM storage virtualization with a variety of storage devices to achieve ...