Programmer Think

1. First understand the difference between compilation and installation and yum installation. Install centos virtual machine under windows, which was written before. Portal~~ Compile and install: It can be installed on demand. It can be installed in whatever directory you want.Parameters can be setYou can install the version you wan ...

mysql Operations and Maintenance Basic Interview Questions and Answers Interview Question 001: Explain the concept and main features of relational databases? Answer: The relational database model refers to the simple binary relationship of complex data structure. All the operations on data are to establish one or more relational tables. T ...

10.1 what is a shell (1) What is Shell Shell is the medium used when the system interacts with computer hardware. It is just a tool of the systemIn fact, there is another layer between the system and computer hardware - the system kernel (1_1) record command historyThe commands we have executed in Linux will be recorded. By default, 1000 hist ...

There are two common commands for setting ACL permissions: setfacl and getfacl. The former is used to set ACL permissions for specified files or directories, and the latter is used to check whether the configuration is successful. The getfacl command is used to view the ACL permission information currently set for a file or directory. The basi ...

1.Shell condition test 1.1. Numerical comparison: Operator: gt: greater thanlt: less thaneq: equal tone: not equal toge: greater than or equal tole: less than or equal to Test syntax: Mode 1: test conditional expression [root@VM-0-17-centos ~]# test 8 -ge 2 / / no value is returned when the command is executed directly [root@VM-0 ...

1. Functions What is a function? A function is a block of function code that can be used many times, a closed (space), and can be called freely in the code. Encapsulation of functions can reduce duplicate code development and improve code utilization. Functions can be passed along, using pre-defined content within the function to process ...

1, CONNECT_TIMEOUT_MILLIS Parameters belonging to socketchannelWhen the client establishes a connection, if the connection cannot be made within the specified milliseconds, a timeout exception will be thrownNote: don't use so in Netty_ Timeout is mainly used for blocking IO, while Netty is non blocking io Examples public class TimeOutTes ...

Build linux + nginx + PHP FPM MySQL (MariaDB) environment 1.Linux selects centos7 installed before Thoughts on security reinforcement of mainframe based on CentOS 7 Although there are a lot of data summary and reference here, what you can remember is that you know the significance of reinforcement. In other words, you have really attac ...

Wazuh consists of three parts: Agent side, Server side and ES side The following figure is the official overall structure diagram: Agent The agent side is responsible for information collection, threat prevention, detection and response. Continue to watch in detail~~ The following figure shows the official detailed architecture of the Agent ...

kafka installation record: Official website: http://kafka.apache.org/downloads.html 1. Download yum install -y wget wget https://mirrors.bfsu.edu.cn/apache/kafka/2.6.0/kafka_2.12-2.6.0.tgz 2. Decompression: tar -zxvf kafka_2.12-2.6.0.tgz -C /opt/ 3. Change of name mv kafka_2.12-2.6.0 kafka 4. Create files cd kafka Create un ...