Programmer Think

This is Niuke Linux C + + course and dark horse Linux system programming notes. 1. Network byte order We already know that multi byte data in memory can be divided into large end and small end relative to memory address. The multi byte data in the disk file can also be divided into large end and small end relative to the offset address in th ...

1, MHA concept MHA (MasterHigh Availability) is a set of excellent software for failover and master-slave replication in MySQL high availability environment. The emergence of MHA is to solve the problem of MySQL single point. During MySQL failover, MHA can automatically complete the failover operation within 0-30 seconds. MHA can ensure th ...

catalogue introduction 1, Relational database and non relational database (1) , relational database (2) , non relational database (3) , relational database and non relational database (1) Different data storage methods (2) . different expansion modes (3) Support for transactional is different (4) Background of non relational database ...

Intel 80x86 series CPUs can run in 16 bit real mode and 32-bit protected mode respectively. In order to be compatible and solve the initial startup problem, Intel designed the hardware of all 80x86 series CPUs, including the latest model CPUs, to run in 16 bit real mode when powered on. The CPU hardware logic is designed to forcibly set the va ...

linux configuration Replace source sudo chmod 777 /etc/apt/sources.list vim /etc/apt/sources.list Enter 10000 first, and then press d repeatedly to delete the existing # The source image is annotated by default to improve apt update speed. You can cancel the annotation if necessary deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ ...

This blog is a brief note of DPDK in simple terms 2.1 introduction to storage system For packet processing, there are mainly two parts (personal understanding), one is CPU The other is CPU Scheduling of instructions and data to be processed. How to give full play CPU On the basis of performance Cache，Memory, SATA Disk, PCIe Devices (network ...

##Run tasks conditionally ####-Syntax of conditional tasks ######The when statement is used to run a task conditionally. It takes the condition to be tested as the value. If the conditions are met. Then run the task. If the conditions are not met, skip the task. ######Example: When when The value of is false Task execution will be skipped whe ...

1, Introduction to fire wall In Linux, the firewall strategy is implemented based on netfilter. 1. netfilter: there is a security plug-in netfilter (access control list) in the kernel. There are many detailed rules in this list. When this rule is allowed or denied, it can control whether other hosts can access, which greatly improves the s ...

brief introduction Homebrew tool can be regarded as a package manager on mac, similar to yum for centos or redhat and apt get for ubuntu. Installing packages will automatically install dependent packages. Homebrew is a free and open source package management system to simplify the software installation process on mac OS and linux systems. It h ...

Linux system can use man [command] to view the use documents of each command. Directory management The directory structure of Linux is a tree structure, and the top-level directory is the root directory /. Other directories are added to the tree by mounting and removed by unmounting. First, we need to know what absolute path and relative ...