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narration Reprinted from: ntpdate and ntpd two time synchronization methods - Fang Zhipeng's blog (fangzhipeng.com) In order to avoid the time deviation caused by the long-term operation of the host, time synchronization is very necessary. Under Linux system, ntp server is generally used to synchronize the time of different machines. One m ...

Exploratory Data Analysis EDA (Exploratory Data Analysis) analysis with python   show holy respect to python community, for there dedication and wisdom   Dataset related: First, UCL wine dataset: UCI data set is a commonly used standard test data set for machine learning. It is a database for machine learning proposed by the University of ...

Spring framework 1. spring official website Official website: https://spring.io/ 2. Spring framework Framework: a series of jar packages and the programming method for realizing a certain function are agreed at the same time, which may be different from the original programming method! Each framework solves some specific problems! Prob ...

HZWZNow young people stick the source code as soon as they come up. Is this suitable for a small vegetable melon like me? It's not suitable.backgroundThis is how the story beginsOne day, I found that I didn't write the layoutPrint as I wantWith an inexplicable beginning One day, two young people didn't talk about martial virtue You have to tell ...

Day14 File Operation Usage of hashlib Characteristics of hash encryption The hash algorithm produces an irreversible summary. (The original text cannot be obtained in ciphertext)Only the summaries of the same data from the same algorithm are consistentThe resulting summary is the same size (length) regardless of the size of the origi ...

MyBatis first day of study Establishment of MyBatis basic environment (taking querying all data as an example) pom <dependencies> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.5</version> </dependency> <dependency> <groupId& ...

Advanced java (VII) -- thread pool and Lambda expression Portal: ·Zhang Qi MAX· ##Learning objectives -[] able to understand the concept of thread communication -[] be able to understand the waiting wake-up mechanism -[] be able to describe the operation principle of Java thread pool -[] be able to understand the advantag ...

1. Download the installation package from mysql official website Download address: https://dev.mysql.com/downloads/mysql/5.6.html#downloads Select the version in the screenshot below 2. Download and upload to linux or use wget wget https://downloads.mysql.com/archives/get/p/23/file/mysql-5.6.43-linux-glibc2.12-x86_64.tar.gz 3. Installa ...

1, Background When we use logstash to read data from the outside, the values read by default are of string type. Suppose we need to modify the type of field value at this time. If we change from string to integer, or delete the field, modify the name of the field, give a default value to the field, we can use mutate filter at this time. 2 ...

1, Introduction to SSH SSH is the abbreviation of Secure Shell. SSH is a security protocol based on the application layer. SSH is a reliable protocol designed to provide security for remote login sessions and other network services. Using SSH protocol can effectively prevent information disclosure in the process of remote management. SSH was o ...