Network Time Protocol (NTP) is used to synchronize the system time of different hosts on the network. All the hosts you manage can synchronize their time with a designated time server called an NTP server. On the other hand, an NTP server will synchronize its time with any public NTP server, or your chosen server. All system clocks managed by NTP are synchronized to the exact millisecond level.
NTP is the Network Time Protocol. It is a protocol used to synchronize the time of each computer in the network. OpenNTPD is a Unix system network time protocol (NTP) open source program that synchronizes the local clock of a computer system with a remote NTP server. It can also serve as an NTP server for NTP-compliant clients.
In a corporate environment, if they do not want to turn on the firewall for NTP transmission, it is necessary to set up an internal NTP server and then let employees use internal servers instead of public NTP servers. In this guide we will describe how to configure a CentOS system as an NTP server. Before introducing the details, let us first briefly understand the concept of NTP.
Why do we need NTP?
Due to the variety of manufacturing processes, all (non-atomic) clocks do not walk at exactly the same speed. Some clocks are faster and others are slower. Therefore, after a long time, the time of one clock slowly shifts from the others, which is often referred to as "clock drift" or "time drift." In order to minimize the effects of clock drift, hosts using NTP should periodically interact with designated NTP servers to keep their clocks synchronized.
Time synchronization between different hosts is very important for planning backups, intrusion detection records, distributed task scheduling, or transaction order management. It should even be part of the daily task.
By default, the NTP server allows queries from all hosts. If you want to filter incoming NTP synchronization connections, you can add rule filtering traffic to your firewall.
In short, NTP is a protocol for synchronizing clocks on all your hosts. We have already explained how to set up an NTP server and synchronize the time between NTP-capable devices and servers.
The fluorinated mica crystals have very good
high temperature resistance, corrosion resistance and light transmission
properties, and can work for a long time at a high temperature of 1100°C.
No reaction occurs
with strong acids and alkalis; complete light transmittance (pure and
transparent). The natural mica plates traditionally used in the observation
window of high-pressure boiler water level gauge are all brown, and the light
transmittance is not good, and the temperature resistance is in the range of
200-700°C, especially the corrosion resistance is poor. The boiler steam drum
water in thermal power plants contains alkali. After reacting with natural mica
and alkali, it is washed with hot air and hot water, and it is prone to
fluffing, scaling, and being broken. In the short term (about 1-2 months), the
water level is not clearly understood. After being broken, it can easily cause
leakage. The fluorite mica does not react with the acid-base solution, and does
not react with water in the hydration reaction, so that it does not form a
layer, does not scale, and does not break. In the long-term (2 to 3 years)
scouring of high-temperature and high-pressure water (including acid and
alkali), the original clarity and transparency can still be maintained. In
China, it has been widely applied to the observation window of steam boiler
water level gauge in high-pressure boilers of thermal power plants. It has also
been selected by Japanese BBK company and NDK (Colin) company for the
observation window of high pressure boiler drum level gauge.
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