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I Explanation of dns terms dns: Domain name service About client: (172.25.254.201) /etc/resolv.conf ##dns points to the file nameserver 172.25.254.101 Test: host www.baidu.com Address resolution command dig www.baidu.com Address detail resolution command A record ip The address is called domain name Addres ...

Source code analysis of Sylar server framework log module Overall design of log library module It is used to format the output program log, which is convenient to locate the problems in the running process of the program from the log. In addition to the log content itself, the log here should also include additional information such as ...

1, Understand the working principle of LVS-DR 1.1 LVS-DR packet flow analysis (1) The client sends a request to the Director Server (load balancer), and the requested data message (the source IP is CIR and the target IP is VIP) reaches the kernel space. (2)DirectorServer and RealServer are in the same network, and the data is transmitt ...

Write in front Please read it first https://blog.csdn.net/qq_46640863/article/details/122684580 Compile the linux kernel. 1, Design content and specific requirements New Linux driver Add a driver (using memory to simulate the device) and use module compilation. requirement: (1) New drivers can be loaded and unloaded dynamically. (2) Use t ...

The previous article introduces the common communication methods between processes: nameless pipeline and named pipeline. This article introduces memory mapping. Memory mapping is very convenient when multiple processes access files to read and write. 1. Introduction to memory mapping mmap function The mmap function can map the files on the d ...

ansible is an automatic operation and maintenance tool, which is developed based on Python. It integrates the advantages of many operation and maintenance tools (puppet, cfengine, chef, func and fabric), and realizes batch system configuration, batch program deployment and batch Run command And other functions. After installing Ansible, you do ...

OpenTelemetry (also known as OTel) is an open source observable capability framework, which is composed of a series of tools, API s and SDK s, enabling IT teams to detect, generate, collect and export remote monitoring data for analysis and understanding software performance and behavior. Popular ones include Zipkin from Spring Cloud, CAT fr ...

1 uninstall the old version: yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine 2 installation environment yum instal ...

Redis master-slave replication brief introduction The read-write capability supported by a single redis is still limited. At this time, we can use multiple redis to improve the concurrent processing capability of redis. How these redis cooperate requires a certain architecture design. Here, we first analyze and implement the master / slave arch ...

preface NTP time synchronization is a time synchronization network technology. There are many kinds of time synchronization technologies, each of which has its own characteristics, and there are great differences in the time synchronization accuracy of different technologies. 1, Chrony 1. Brief description Note that NTP is a netwo ...