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Linux system is Multi-users and Multi-tasks. The purpose is that a Linux host can provide services to many users and run multiple services at the same time. But how can we distinguish each user? As an administrator, what permissions do I have for Linux systems? As an ordinary user, what can you do with Linux system? This involves the user categ ...

In this paper, the principle of rsync algorithm and the workflow of rsync are analyzed in detail through examples. rsync Official Technical Report and Official Recommendation Articles Explanation. Following is the rsync series: 1.rsync(1): Basic commands and usage 2.rsync(2): inotify+rsync and sersync 3.rsync algorithm principle and workflow an ...

What is automated operation and maintenance With the continuous development of the information age, IT operation and maintenance has become an important part of the connotation of IT services. In the face of more and more complex business and diversified user needs, expanding IT applications need more and more reasonable modes to ensure ...

This article is based on Black Shell Mesh Release Source of this article Quartz Timed Mail to Send Backup Files - Black Shell Network http://www.bhusk.com/articles/2017/07/27/1501146724360.html Uncle Shell had a funny moment text Previously, due to the black shell blog database, has not done regular backup processing, although not nec ...

mongoDB database The concept of mongoDB database An instance of MongoDB can have one or more independent databases, each with its own collection. aggregate Collections can be seen as tables with dynamic schemas. File Documents are the basic data units in MongoDB, similar to rows of relational database tables. Documents are an ord ...

Blog Links: http://codeshold.me/2017/08/tcpdump_tshark_notes.html Usually we need to analyze and count the data packages. Although it is very convenient to use python scapy library to develop, it will be more convenient if we are familiar with tshark (wireshark command line), tcpdump and other tools, including editcap, mergecap and so on, ...

Reprinted from http://www.178linux.com/79792 The Ansible command uses Ansible syntax uses ansible-m-a -m NAME, -module-name=NAME: Specifies the module used for execution -u USERNAME, -user=USERNAME: Specify the remote host to run the command with USERNAME -s, -sudo: equivalent to sudo commands on Linux systems -USUDO_USERNAME, -sudo-use ...

Basic concepts of variables Variable classification User-defined variables Environmental variables: These variables mainly store data related to the operating environment of the system. Location parameter variable: This variable is mainly used to transfer parameters or data to scripts. The variable name can not be customized and the function o ...

Database Architecture: One Primary and Two Subordinate master: 192.168.0.11 slave1: 192.168.0.201 slave2: 192.168.0.202 MHA software: Download address mha4mysql-manager-0.57.tar.gz mha4mysql-node-0.57.tar.gz The Manager Toolkit mainly includes the following tools: Masha_check_ssh Checks the SSH configuration of MHA Masha_check_repl che ...

Previous analysis has said that Windows Manager Service is only responsible for Window management, not for View drawing and layer mixing. This article will analyze how WMS manages windows in the end. When I first came into contact with Android, I felt that Activity seemed to be the encapsulated Window of Google. As long as APP started the new a ...