Linux ntp time server and client installation and configuration 1. Main file and command:/etc/ntp. conf server configuration file/etc/sysconfig/clock time zone configuration file/bin/date display and set the time command/sbin/hwclock for BIOS clock (hardware clock) the command/usr/sbin/ntpd is mainly used to provide the NTP service program/usr/sbin/ntpdate for th
For more information, see:
How accurate is Android GPS? Part 1: understanding location datahow accurate is Android GPS? Part 2-consuming real-time locations
Google developer docs-location strategies
Android blog-deep dive into location
GPS testing tool (Open Source)
HTML5 geolocation API-How accurate is it, really?
Test Demo project:
Gpsactivty. Java
Public c
I have developed GPS-related embedded software for several years, So when talking about a program to test the GPS positioning module, the first reaction is to read the data from the GPS module through the serial port, and then parse the NMEA format data of GPS.
Today, due to work needs, I took out a previously written
Network Time Protocol (NTP. The protocol used for local and remote NTP server time synchronization. I have played so many protocols that I have never paid much attention to them. I read the articles of Linxinsnow and Longas, And then I studied it. It is recorded as a note.
I will not write more details about this protocol. You can simply describe it. The specific details are far more complex than the
This is a creation in
Article, where the information may have evolved or changed.
File Project Main.goPackage Main
Import ("Encoding/binary""FMT""NET""OS""Os/signal""Sync""Time")
Const (NTP_SERVER_IP = "time.windows.com"/*NTP ip*/NTP_PORT_STR = "123"/*NTP dedicated port number String */Ntp_pck_len = 48LI = 0VN = 3MODE = 3Stratum = 0POLL = 4PREC =-6jan_1970 = 0X83AA7E80/* Time in seconds between 1900/~19
Linux configuration NTP serverBackgroundWhen the server is more, time is accurate or not, the same is a big problem. Although this problem is always overlooked, it is necessary to unify the time. Here's how to configure a Linux time server within a LAN.Configuration of the environment and requirements:1. Assume that a Linux machine time server with IP 192.168.0.240 is in the 192.168.0.0 network segment.2.192.168.0.240 Server can Sisu network, can be s
Linux and cloud Computing--the second phase of Linux Server SetupThe first chapter: NTP Server Setup650) this.width=650; "Src=" Http://s4.51cto.com/wyfs02/M02/84/7C/wKiom1eR3EWj8CJjAAECGMnPQ_I264.jpg-wh_500x0-wm_3 -wmp_4-s_2524553483.jpg "title=" server. jpg "alt=" wkiom1er3ewj8cjjaaecgmnpq_i264.jpg-wh_50 "/>1.NTP Server (NTPd) Install the NTPD and configure the NTP
When installing an Oracle 11g RAC, we need to configure the NTP service. There are many ways to configure clock synchronization in the case of virtual machines, either using the VMware-brought clock synchronization feature or directly using a local node as a time server. This article describes a clock server that directly configures NTP mode.[Python]View PlainCopyprint?
1. View the two-node hosts config
following the previous section of Ubuntu configuration OpenStack One: Configure the host environment, continue to synchronize for installation time, and configure OpenStack's package source and install database Maridb. (The full text is done by hand-built and)First section connecting the configuration host environment http://www.cnblogs.com/skylarzhan/p/7702078.htmlOne, the installation time synchronization NTPNTP (Network time Protocol) is a protocol used to keep the time synchronization of ind
Details
Nokia introduced a new Bluetooth GPS receiver LD-3W during its 3gsm 2006 period. As an upgraded version of the LD-1W, Nokia claims LD-3W positioning accuracy up to 5 meters, support path planning and voice navigation, can be used with a variety of navigation software, and compatible with Nokia s60 platform mobile phone. This LD-3W and last year launched the LD-1W appearance, size, weight are completely consistent, the difference is that the
Design of serial communication system between FPGA and GPS-OEM Board
[Date:]
Source: Electronic Components application Author: Chen shilei, Liu Guixi, to Guohua
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0 Introduction
Global Positioning System (GPS) is the second generation of satellite navigation system in the United States. It is developed on the basis of the satellite navigation system of the Mer
Control: Samsung arm Cortex-A8 (s5pv210)
GPS: Ublox-6M
System: Android 2.3.1
Kernel: linux2.6.35
Bootloader:U-boot for tiny210 ver4.0
Development Board: tiny210v1 sdk2 (512 M ddr2ram SLC nandflash 256 m)
The review is over. It's only by the end of June that we have time to sit down and learn something. This should be the last gadgets of the undergraduate course. The foreplay is shortened, so you can get started with things.
Because the friendly driver
Mac OS X system is on by default the NTP service, that is, you can use any Mac OS installed computer as an NTP server, if not turned on please refer to my previous post to open it: http://asherwang.blog.51cto.com/ 11255017/1855135; my previous company used a MacBook Pro as an NTP server, but sometimes it might take some tweaking to make it work better.1. Set up t
1 Data analysis
Packet analysis
2 Workaround (script)
Method 1:
You can fix the problem by upgrading the existing NTP to NTP-4.2.8P10
#! /bin/bashMkdir-p/home/zyb/toolsCd/home/zyb/tools#wget http://archive.ntp.org/ntp4/ntp-4.2/ntp-4.2.8p10.tar.gzYum install gcc gcc-c++ openssl-devel libstdc++* libcap*Cp-ar/etc/
The NTP service process has fixed a major security vulnerability. Please upgrade it as soon as possible.
US-CERT disclosed that a large number of security defects have been found in ntpd recently. Ntpd is a service process of Network Time Protocol NTP. Most servers and devices use it to process time-related tasks.
Although there are multiple NTP service processes
In a clustered environment and multi-server applications that require log synchronization, in order to ensure normal collaboration between multiple servers, it is necessary to keep their time consistent, and manually adjust the time on multiple servers is extremely unscientific, and this requires the use of NTP time servers to complete the synchronization of time. One, the installation of NTP server We only
NTP upgrade, upgrade Redhat is very smooth, after the upgrade will default overwrite the original file, restart the service, use NTPD--version to view the verification, can upgrade SuSE Linux but found errors frequently, the following is my upgrade encountered some problems, After the summary hope to have and I met the same mistake of the parents can be used as a reference:I. Due to the vulnerability of NTP
When querying with ntpdate-d, you will find the following 2 messages that cause no server suitable for synchronization found error:Error 1. Server Dropped:strata too highThe NTP client runs Ntpdate ServerIP, and no server suitable for synchronization found error occurs. The NTP client was viewed with ntpdate–d ServerIP and found "Server dropped:strata too high" error, and "stratum" is displayed. And under n
Multiple CentOS7 computers use NTP for Time Synchronization1. NTP Clock Synchronization Methods
NTP has two clock synchronization modes in linux: Direct synchronization and smooth synchronization:Direct SynchronizationUse the ntpdate command to synchronize and directly change the time. If there is a task running at on the server, the current server time is, but t
Ntp server in Linux
1. What is ntp?
Network Time Protocol (NTP) is a Protocol used to synchronize the computer's Time. It can synchronize the computer's server or clock source, it provides high-precision time correction.
2. Introduction to the ntp configuration file
1./etc/ntp
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