rsyslog levels

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"Reprint" How to prevent the website from being accessed by malicious reverse proxy (several levels of solution)

make a framework, to embed our site, visitors to browse the time, as if browsing his own site, then how to solve it? The following methods can be broken:PHP-Level SolutionsThe JS-level solution is not friendly to search engines, although it allows the malicious proxy page to jump back. Here is the server-side (PHP) solution, the code is relatively simple, not much to say.$proxy _rs=$this-Proxy_filter ();if($proxy _rs! = ' Somesite.net ' | |$proxy _rs! = ' Www.somesite.net ' ) { Echo' Illegal

Linux/etc/inittab six operating levels for a simple understanding

)If you don't run the network, it's the same as level three.# 3-full multiuser modes Multi-user mode (command mode that we often use)# 4-unused is not used, system retention level# 5-x11 Desktop mode# 6-reboot (do not set Initdefault to this) reboot#ID: 3: initdefault: here is where this file is configured, in command mode, the default is level--3--。 Here can not be changed, if you change to 0,1,6 your system will not turn on the machineThis article is from the "12993685" blog, please be sur

Linux system administrator three levels of discipline

, DDD, etc.), can debug the kernel, device drivers and various applications, can find out most of the bugs and can self-modify or generate reports to submit the corresponding kernel source tree administrator, know to modify the kernel to change the kernel behavior to better apply to the current application environment ;4, with a few hackers best friends, and always discuss with them exchanges;5, proficient in c/c++/compilation, can write high-quality programs, by downloading some of the applicat

Spring transaction propagation properties and isolation levels

data multiple times within a transaction. When this transaction is not finished, another transaction accesses the same data.Then, between the two read data in the first transaction, the data that was read two times by the first transaction because of the modification of the second transactionMay not be the same. This occurs when the data that is read two times within a transaction is not the same and is therefore called non-repeatable read.Illusion reading: A phenomenon that occurs when a trans

Baidu Antivirus real-time monitoring of the different levels of what is the difference between

Baidu Antivirus real-time monitoring the difference between the different levels are as follows: Baidu Antivirus when the choice of monitoring level for "high": Baidu Antivirus will perform the most stringent protection, to ensure safety. Baidu Antivirus when the choice of monitoring level is "medium": Baidu Antivirus will ensure that the system performance and security to achieve the best balance. Baidu Antivirus when the choice of monitoring leve

Java thread safety four ways five levels

Four Ways of sychronized keywords Sychronized method () {} Sychronized (objectreference) {/*block*/} Static Synchronized Method () {} Sychronized (Classname.class) where 1 and 2 represent the current object of the lock, that is, an object is a lock, and 3 and 4 represent the lock class, that is, the lock of this class. Note that sychronized method () is not a lock function, but rather a lock object, namely: If two of the methods in this class are sychronized, then as long as two threads sh

Spring Troubleshooting-Lower log levels

Problem Description1. After the page has been modified, after the submission of the page 400 error, but the background does not output any error message. 2. The debug listener should also have no response to the corresponding submit link on the page (not in the Controller method in the background). 3. Refresh the submit link in the browser to enter the background method (debug can be heard)Workaround:1. Through 3rd of the question, it is clear that the contents of the page must be the result of

Java===java Basic Learning (3)---Data type conversions, operator levels, enumeration types

type* Otherwise, if one of the operands is of type float, the other operand will be converted to float type* Otherwise, if one of the operands is of type long, the other operand will be converted to a long type* Otherwise two operands will be converted to int type Excerpt from: "Java Core technology" 3.5.5 Forced swap:double x = 9.9997; int NX = (int// Strong turn operation, so it can truncate the decimal part NX = 9 // Of course we can also perform rounding operations, Used is

Python lists two levels of directories and saves them to List.txt

Many times you need to list the files in each subdirectory under a directory and save them to list.txt so that you can traverse the subdirectory laterIn image processing, this method is commonly used to process picture catalogs.The directory structure is divided into 3 levelsRootDirSubDir1Pic1Pic2SubDir2Pic1Pic2Want results List.txtUnder the RootDir directoryList.txt content isSubDir1SubDir2Under the SUBDIR1/2 directoryList.txt content isPic1Pic2The code is:Use the method to place the. Py in the

SQL Server Tens of millions of levels of paging stored procedure Code _mssql

Copy Code code as follows: Set ANSI_NULLS on SET QUOTED_IDENTIFIER ON Go Create PROCEDURE [dbo]. [Sp_pagination] /**//* *************************************************************** * * Tens of millions of levels of paging stored procedures * * *************************************************************** Parameter description: 1.Tables: Table name, view 2.PrimaryKey: Primary keyword 3.Sort: Sort statements without ORDER by exam

Three different levels of the operator && basic knowledge

Operators can be understood from three different levels. First Level understanding When the operands are all Boolean, "" performs a Boolean and (and) operation on two values. Copy Code code as follows: X==0 y==0//Only returns True if both X and Y are 0 o'clock Relational operators have higher precedence than ' '. Second Level understanding "" can perform Boolean and (and) operations on truth and false values. (The false

Ensure Linux server security against four levels of attack _linux

With the continuous expansion of Linux enterprise applications. A large number of network servers are using the Linux operating system. The security of Linux servers can be more and more concerned. This is listed here according to the depth of the attack on the Linux server and proposes different solutions. With the expansion of Linux enterprise applications, there are a large number of network servers using the Linux operating system. Linux server security can be more and more attention, here a

Tens of millions of levels of paging stored procedure "Deep sea Collection"

Effect Demo: http://www.cn5135.com/_App/Enterprise/QueryResult.aspx CREATE PROCEDURE cn5135_sp_pagination/***************************************************************** * Tens of millions of levels of paging stored procedures * ****************************************************************Parameter description:1.Tables: Table name, view2.PrimaryKey: Primary keyword3.Sort: Sort statements without ORDER by example: NewsID desc,orderrows ASC4.Curren

Problem handling for classes with different levels of ClassLoader define

Problem Problem Description: In the program code, execute the following statement: Object mapperobj = Class.forName (mapperclassname). newinstance (); Mapperinterface mapper = (mapperinterface) mapperobj; Newspaper ClassCastException. Bug fix:1. Obtain the Classloader:mapperObj.getClass () getClassLoader () of the mapperobj and Mapperinerface.class under the operating environment respectively: Sun.misc.launcher$appclassloader MapperInterface.class.getClass (). getClassLoader (): WebContainerCla

A brief explanation of four intrusion levels on Linux servers

With the expansion of Linux enterprise applications, there are a large number of network servers using the Linux operating system. Linux server security can be more and more attention, here according to the depth of the attack on the Linux server in the Level form, and propose different solutions. The definition of a Linux server attack is that an attack is an unauthorized behavior designed to hinder, damage, weaken, and compromise the security of a Linux server. The scope of the attack can be r

Three levels of performance optimization

Editor's note: Performance optimization, in short, is to make it run faster, without affecting the correctness of the system's operation, and to accomplish a specific function in less time. This article is the first in a series of performance optimization articles, mainly on three aspects of performance optimization. There are three levels of performance optimization: ◇ System Level ◇ Algorithm Level ◇ Code Hierarchy The system level is concerned

Images of different grayscale levels

Study Dip No. 0 Day For more details, refer to: http://tony4ai.com/2014/11/06/dip-1-1-images of different grayscale levels Conclusion: For more detailed images, when the image size (N) is constant, the gray level is relatively independent of the sensory quality; Explanation: If the image detail is more, lower the gray level, the visual feeling is not very different Code writing is arbitrary and performance optimizations are not performed. Only for obs

Database isolation levels-database Isolation level

problems of dirty reads, but requires more system resources and greatly increases the likelihood of system transaction blocking. you should choose the appropriate transaction isolation level to balance the total cost of each isolation level based on the application's own requirements for data integrity. The highest level of isolation (Serializable) ensures that the same data is obtained for each read operation of the transaction, which, as mentioned earlier, results in a lock operation under m

Introduction to spring propagation characteristics and isolation levels

no active transaction, Then press Transactiondefinition.propagation_required property to perform 4. Isolation level of spring transaction 1. Isolation_default: This is a platfromtransactionmanager default isolation level that uses the default transaction isolation level of the database. The other four levels of isolation from JDBC correspond to 2. Isolation_read_uncommitted: This is the lowest isolation level for a transaction, which allows an exte

A little bit more about the compiler's different levels of optimization

Experimental Purpose In a programming language, you can compare code writing in different programming styles, or generate assembly code from a compiler by using different compilers and compilation optimization parameters, and statically analyze the efficiency of the generated assembly code. experimental platform, tools Under the Windows platform, use the VC6.0 tool. Experimental design Optimized comparison of redundant code by the same compiler at different

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