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基于linux的分布式文件系统的设计实现毕业论文.doc 44页
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本科生毕业设计(论文)
学院(系):
指导教师:
南阳理工学院本科生毕业设计(论文)
基于linux的分布式文件系统的设计实现
Design and Implementation of the DFS Distributed File System
计:毕业设计(论文) 37页
南 阳 理 工 学 院 本 科 毕 业 设 计(论文)
基于linux的分布式文件系统的设计实现Design and Implementation of the DFS Distributed File System
学 生 姓 名:
指导教师(职称):
评 阅 教 师:
完 成 日 期:
南阳理工学院
Nanyang Institute of Technology
基于linux的分布式文件系统的设计实现
随着公司规模的不断增大,业务数据也随之成倍的增长,海量数据的存储和读取成了整个系统的瓶颈。除此之外,还要努力保证服务器不能宕机,否则所有依赖共享提供数据的应用就不再可用。考虑到传统存储方式存在的性能瓶颈和单点故障,有必要构建一个高可用集群分布式文件系统来保障服务和数据的高可用性,因而,本文总结和分析了现有高可用集群系统的现状和实现技术,提出了一种利用开源软件搭建高可用集群,并结合分布式文件系统存取数据的方案,该方案通过三个storage节点保存数据,三个tracker节点结合MariaDB存取和管理数据。保证业务的不中断和数据的安全可靠性,从而将因软硬件故障和人为的错误带来的损失降到最低。
单点故障;分布式;集群
Design and Implementation of the DFS Distributed File System
Software Engineering Major
[Abstract] with the increasing size of the company, business data also grow exponentially, and the storage and reading of huge amounts of data become the bottleneck of the whole system. In addition, to ensure that the server can not be down, otherwise all rely on the application of data sharing is no longer available. Taking into account the existence of the traditional storage method of the performance bottleneck and single point of failure, it is necessary to construct to ensure high availability, data service and a high availability cluster and distributed file system, this paper summarizes and analyzes the present situation of the existing high availability cluster system and implementation technology, proposed a high availability cluster using open source the software, combined with the distributed file system data access scheme, this scheme through three storage nodes to save the data, three tracker nodes with MariaDB data access and management. Ensure business continuity and data secu
正在加载中,请稍后...Vulnerability Note VU#853097
ntpd autokey stack buffer overflow
Original Release date: 18 May 2009 | Last revised: 12 Aug 2009
ntpd contains a stack buffer overflow, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system or create a denial of service.
Description
NTP (Network Time Protocol) is a method by which client machines can synchronize the local date and time with a reference server. ntpd, which is the NTP daemon, contains a stack buffer overflow when it is compiled with OpenSSL support. The vulnerability is caused by the use of sprintf() in the crypto_recv() function in ntpd/ntp_crypto.c. The vulnerable code is reachable if ntpd is configured to use autokey. This vulnerable configuration is indicated by a crypto pw password line in the ntp.conf file, where password&is the password that has been configured.
A remote, unauthenticated attacker may be able to execute arbitrary code with the privileges of the ntpd daemon.
Apply an update
This issue is addressed in ntp 4.2.4p7 and 4.2.5p74.
Disable autokey
This vulnerability can be mitigated by removing the crypto pw passwordline from the ntp.conf file.
Systems Affected ()
If you are a vendor and your product is affected, .
CVSS Metrics ()
Environmental
References
This vulnerability was reported by Harlan Stenn of the NTP Forum at ISC (), who in turn credits Chris Ries of CMU.
This document was written by Will Dormann.
Other Information
FeedbackIf you have feedback, comments, or additional information about this vulnerability, please send us .
Report a Vulnerability
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+1 412-268-5800NTP(GPS,,)
NTPDVRNVRNTPSNTPMD5NTP/SNTPIRIG-BDCF77PTP
NTPGPS,GPS1U/2ULinuxB2BIT
NTPK806C110100MK806D210100MK805410100MIPIP
NTP v1.v2.v3&v4(RFC)&&&&&&&&&&&&&&&& SNTP(RFC2030)
&& NTP Unicast,Broadcast,Multicast,Autokey&&&& &&&&TIMERFC868)
&& FTPRFC959DAYTIMERFC867)&&&&&&&&&& DHCP (RFC2131)
&& HTTP/SSL/HTTPSRFC2616)&&&&&&&&&&&&&&&& SSH/SCP (Internet Draft)
&& SNMP v1,v2MIB II (RFC1213)&&&&&&&&&& &&&&&RSA
&& IPV4IPV6IPv4/IPv6 Hybrid
& NTP10000/300
TCXO 0.01s24
OCXO1ms72 Rb1ms
& L1,C/A-1575.42MHz-160dBm
& GPS30m,40506080100120150200m
& 1U/2&&&&&& U2.7Kg 220V 20%& 47Hz 63Hz
& -20 55-40 75-45 85
1 GPS 12GPSGPS 16 CDMA
GPS//CDMA7*10-8(7*10-9)
2 ntp/sntp0.2-10ms RS-232/422/485
3B0.1S10S NTP/SNTP0.2-10msPTP:70 ns
Snmp SNMP telnet
548V 110V 220V
7WINDOWS9X/NT/2000/XP/12/vistaLINUXUNIXSUN SOLARISIBM AIXHP-UXNTP
&&&&&&&&&&&&&&&&&&& &&&&&&&&&&&&&&&&&
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