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File Transfer Protocol (FTP) is one of the most common network services in UNIX. Setting up an anonymous server is fairly straightforward. Setting up a virtual FTP host and a separate FTP account setting requires some skill. 1. Anonymous FTP This is the most common service: a machine is a separate FTP server. Most UNIX versions automatically complete this setting: the FTP root is usually/home/ftp if for some reason, the anonymous FTP service is not set on your machine, its setup works as follows: The ~FTP in the following narration is in/...

Database security Policy Database security issues have been around the database administrator's nightmare, the loss of database data and the database by illegal user intrusion makes the database administrator physically and mentally exhausted. This paper puts forward some security policies around the security of the database, hoping to help the database administrator, no longer nightmares every night. Database security issues should include two parts: first, the security of database data it should be able to ensure that when the database system downtime, when the database data storage media is corrupted and when the database user misoperation, database data ...

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This paper is an excerpt from the book "The Authoritative Guide to Hadoop", published by Tsinghua University Press, which is the author of Tom White, the School of Data Science and engineering, East China Normal University. This book begins with the origins of Hadoop, and integrates theory and practice to introduce Hadoop as an ideal tool for high-performance processing of massive datasets. The book consists of 16 chapters, 3 appendices, covering topics including: Haddoop;mapreduce;hadoop Distributed file system; Hadoop I/O, MapReduce application Open ...

Xorg is a X11 implementation, and the X Window system is a C/s structure of the program, xorg just provide an X server, responsible for the underlying operation when you run a program, the program will be connected to the X server, by X server receives keyboard mouse input and is responsible for the movement of the Screen Output window, window caption style and so on, all by a kind of program called Window Manager to complete, you see these now, not only have xorg, have the three Windows corresponding program, there is a window manager: ...

MySQL has become one of the most widely used databases in the current network, especially in Web applications, which occupy the absolute advantage of small and medium applications. It all stems from its compact, safe, efficient, open licensing and multi-platform, and, more important, the perfect combination of--php with one of the three web languages. Unfortunately, a default installation of MySQL, because the root password is empty and the program vulnerabilities caused by the overflow, so that the installation of MySQL server is a frequent target. What is more serious is that the database is often destroyed after the attack, causing disaster easily ...

To complete this chapter, you will be able to do the following: Use the DF and Du commands to monitor the size of the file system's effective space to clean up the filesystem space by clearing unused files and core files to clean up the var file system by trimming the log files to extend a volume group from the command line to extend a logical volume from the command line Extend a file system from the command line 1. Monitoring disk usage Use the DF command to check the file system for valid space. # DF filesystem Kbytes used av ...

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 ...

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Oracle upgraded its unix-based operating system Solaris in Wednesday, with new features that would allow Solaris to better run cloud deployments and optimize compatibility with other Oracle products. "We are committed to solving the difficulties people have in deploying private or public cloud infrastructures." "Oracle's http://www.aliyun.com/zixun/aggregation/7740.html" > Product Marketing Senior Director Charlie Boy ...