1. When you execute this command, ntpdate us.pool.ntp.org has an error message. Name Server cannot be used: temporary failure in name resolution 2. solution (add DNS server) VI/etc/resolv. conf Add: nameserver 8.8.4.4 3. Common NTP server addresses and IP addresses in China 2011-09-07 15:06:08210.72.145.44 (IP address of the National Time Service Center Server)133.100.11.8 Fukuoka University of JapanTime-a.nist.gov 129.6.15.28 NIST, Gaithersburg,
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12
ThuDec0316:16:50CST20152015-12-0304:16:50
Appendix: Frequently Used NTP server address with fast speed:
Ntp.sjtu.edu.cn 202.120.2.101 (address of the NTP server in the Network Center of Shanghai Jiao Tong University))
Time-a.nist.gov NIST, Gaithersburg, Maryland time-b.nist.gov 129.6.15.29 NIST, Gaithersburg, Maryland time-a.timefre
Recently the company's server time has been inaccurate, looked for several times the server, after testing Shanghai Jiaotong University's still count, address:ntp.sjtu.edu.cn (Shanghai Jiaotong University Network Center NTP server address)202.120.2.101 (Shanghai Jiaotong University Network Center NTP server address)So through the crontab do timed tasks, let every 5 minutes synchronization time:[Email protected] ~]# crontab-lTen * * * */usr/sbin/ntpdate-u ntp.sjtu.edu.cn[Email protected] ~]#Other
Time synchronization is important when the Linux service needs time-stamping. Here is a synchronization command that I used recently.ntpdateMy virtual machine is CentOS, install Ntpdateinstall ntpdateAnd thenSelect the NTP server in Shanghai Jiaotong University to synchronizentpdate ntp.sjtu.edu.cnCommonly used NTP addresses in ChinaAddress transferred from watercress (http://www.douban.com/note/171309770/)
210.72.145.44 (National Timing Center Server IP address)133.100.11.8 Japan Fukuoka U
When the Linux server time is not correct, you can use the Ntpdate tool to correct time.
Installation: Yum Install Ntpdate
Ntpdate Simple usage:
# ntpdate IP
# ntpdate 210.72.145.44
The following are some of the available NTP server addresses:
Name
Ip
Location
210.72.145.44
210.72.145.44
China (National Timing Center)
133.100.11.8
133.100.11.8
Japan (Fukuoka University)
Time-a.nist.gov
129.6.15.28
Tags: hit ted 2.4 Microsoft ya Black new ADO div val FacilityTime synchronization is important when the Linux service needs time-stamping. Here is a synchronization command that I used recently.
# ntpdate s1a.time.edu.cn
Commonly used NTP addresses in China
210.72.145.44 (National Timing Center Server IP address)133.100.11.8 Japan Fukuoka UniversityTime-a.nist.gov 129.6.15.28 NIST, Gaithersburg, MarylandTime-b.nist.gov 129.6.15.29
The IP address of the NTP server that can be used in China, and the time deviation value of the Tailfeather server, the Tailfeather clock server live connection antenna, the antenna has been connected for more than 72 hours before testingTime-a.nist.gov 129.6.15.28 NIST, Gaithersburg, Maryland offset 0.013798 secTime-b.nist.gov 129.6.15.29 NIST, Gaithersburg, Maryland offset 0.013798 secTime-a.timefreq.bldr
standards.
2. What makes cloud computing?
The National Institute of Standards and Technology (NIST) defines five key features, three service models, and four deployment models for cloud computing. As shown in 1, detailed descriptions will be provided later.
2.1 key features of cloud computing
The five key features presented by cloud services represent their relationships and differences with traditional computing methods:
• On-demand self
When the Linux server is in the wrong time, you can use the Ntpdate tool to correct the time.Installation: Yum Install NtpdateNtpdate Simple usage:# ntpdate IP# ntpdate 210.72.145.44The following are some of the available NTP server addresses:Common server address: server one: 1.cn.pool.ntp.orgServer Two: 2.asia.pool.ntp.orgServer Three: 3.asia.pool.ntp.org
Name
Ip
Location
210.72.145.44
210.72.145.44
China (National Timing Cente
When the Linux server time is not correct, you can use the Ntpdate tool to correct time.
Installation: Yum Install Ntpdate
Ntpdate Simple usage:
# ntpdate IP
# ntpdate 210.72.145.44
The following are some of the available NTP server addresses:
Name
Ip
Location
210.72.145.44
210.72.145.44
China (National Timing Center)
133.100.11.8
133.100.11.8
Japan (Fukuoka University)
Time-a.nist.gov
129.6.15.28
Let Debian4 support 4 GB memory or above-no need to re-compile the kernel-Linux Release Technology-Debian information. The following is a detailed description. Use uname-a to check the current kernel, which is displayed as follows: Linux debianpc 2.6.18-4-686 #1 SMP Thu May 10 00:23:00 UTC 2007 i686 GNU/Linux
Use apt-cache search linux image big mem to find whether there are kernel files that match the current kernel that support large memory, as shown below:
Loadlin-a loader (running under DO
Time Protocol (NTP), a protocol designed to synchronize the clocks of computers over a network, for policyears. NTP Version 3 is a standard protocol ormalized in RFC 1305 protocol hat uses the user datateprotocol (UDP) and Port 123.
Unlike PCs or servers, Cisco network devices specifically need to run NTP to synchronize the time and date. That's because most Cisco devices don't have an internal clock.
For example, when a Cisco 2600 or 3600 series router loses power or the network administrator
computer is five minutes slow every day. What precision do you need to be right? The average home computer clock error is acceptable for one minute. A clustered server typically requires all clocks to be synchronized within one second. who is syncing with? It is generally synchronized with the NTP (Network time Protocol) servers around the world. America Standard Time is provided by the NIST release,nist
The search engine is built on the use of the standard set of real-world test cases, which allows developers to measure the relative effectiveness of alternative methods. This article discusses the NIST Text Retrieval Conference (TREC) project, which creates an infrastructure for measuring the quality of query results.
We always think that text file queries in our native language are guaranteed, but web search engines like Yahoo, Google and Bing don't
these problems. There is a lot of controversy in this research, although it has almost become the basis of practical tools for commercial software and research projects. An unsound term can lead to confusion because people use program checkers, which uses the term unsound to replace different meanings. A blog explains why the same term has two conflicting meanings. "Most program checkers prove the law. In particular, the main purpose is to prove the correctness of the program in a certain aspec
time the service is started by/ETC/INIT.D/NTPD.Check server synchronization Status:Ntpq-pNtptrace 192.168.0.179If the output is correct, it indicates that the time server was successful. The time is automatically synchronized each time the server is started.Configuring the Linux ClientExecute Ntpdate ntp_server_ip on the Linux client can be based on time server unified LAN time, put the above command in Cron every morning 3 regular execution, crontab–e and then enter0 3 * * */usr/sbin/ntpdate 1
security self-evaluation Tool) is issued by the National Institute of Standards and Technology (state Institute of Standard and Technology,nist) An automated tool for conducting security risk self-assessment, using a typical knowledge-based analysis approach, using questionnaires to assess the gap between the security status of the system and the NIST SP 800-26 Guide.
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