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  Nginx installation 1. Create a new user and group ngxuser:ngxuser groupadd ngxuser  useradd -m -g ngxuser ngxuser #-m automatically creates the home directory, - g specifies the group 2. Install dependent packages (nginx installation is installed by root user) The two covered by red do not need to be installed #Force all installation ...

summary Java and C#, can use UDP and TCP protocols for network communication. This chapter only describes the basic use of UDP and TCP. Compared with various standard / non-standard TCP, ModbusTCP (occupying 502 port) and lower computer custom network communication protocols required when writing the upper computer, Java TCP and UDP progra ...

DDS 1 DDS 1.1 DDS core idea 1.1.1 phase amplitude table of sine wave: It has a sufficiently fine phase step. N is the serial number of data, phase is the phase, Am is the calculated value of sine wave, and Data_10 is the hexadecimal representation of 10 bit digital quantity, which is described by a 10 bit DAC, in which the actual value ...

preface Jingdong coupon https://m.fenfaw.net/ Welcome to my personal blog Chens life Tk series tutorials: Tkinter tutorial series 01 - Introduction and installation Tk We will write a foot and meter conversion program. Through this program, we will understand how to design and write a real utility program, and we will also understand the basi ...

1, Binding method 1. Object binding method First, let's make it clear that all methods or functions in a class are bound to objects by default. Next, we will slowly analyze the application of binding methods through examples. class People: def __init__(self,name,age): self.name = name self.age = age def talk(self): ...

import torch import torch.nn as nn import numpy as np torch.__version__ '1.0.0' 3.1 actual combat of logistic regression In this chapter, we will deal with structured data and use logistic regression to classify structured data. 3.1.1 introduction to logistic regression Logistic regression is a generalized linear model, which has man ...

1, Depth of Mybatis configuration file 1.1,SqlMapConfig.xml Hierarchical relationship of Mybatis's core configuration file Common configuration analysis of Mybatis 1. environments tab Database environment configuration, supporting multi environment configuration There are two types of transaction manager: JDBC: this configuration direct ...

1. Basic introduction Official website https://github.com/alibaba/Sentinel/wiki/ Hot spot parameter current limiting 2. @SentinelResource Bottom covering method There are two types: system default and customer defined In the previous case s, the default prompt of sentinel system is used after the outflow problem is limited Use @ SentinelRes ...

JavaScript you don't know (Volume I) Chapter 3: let keywords 1. In Chapter 4, we will discuss promotion Promotion means that a declaration is considered to exist in the entire scope of the scope in which it appears. However, declarations made with let s are not promoted in the block scope. The declaration is not valid until the declared ...

runtime and memory management of iOS What is it? To understand what runtime is, the description of official documents should be the most authoritative. The official definition is as follows: from compilation time and link time to runtime, Objective-C language will postpone decisions as much as possible. Whenever possible, it performs operatio ...