Tag：information
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Time：2021-7-30
Yesterday’s recommendation:Learn a Linux command every day (61): WGet Command introduction The ping command is used to test the network connectivity between hosts. Ping is a simple way to send network data to and receive network data from another computer on the network. It is usually used to test whether it can be accessed through […]
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Time：2021-7-30
The article is continuously updated every week. Your “three links” are the greatest affirmation to me. WeChat can search the public for the first time to read the official account of “backend Technology School” (usually one to two updates earlier than blogs). Operating system “process” is a basic concept that you should contact when learning […]
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Time：2021-7-29
User classification UID explain administrators 0 All permissions Program user 1-999 It is not allowed to log in to the system when running specific programs or services Ordinary users 1000-60000 Created by the administrator, you can log in to the system to manage and maintain the system The user’s attribute information includes but is not […]
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Time：2021-7-28
Hello, I’m brother! The Dragon Boat Festival is over, and I have to start working and studying again! I found that many small partners don’t know much about authentication and authorization, and can’t understand the concepts of session authentication, JWT and cookie. Therefore, according to my daily application of this part of learning in the […]
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Time：2021-7-28
User group Description: Group is one of the user‘s attribute information; Any user has only one default group; A user can have multiple additional groups; There is no relationship between the default group and the additional group; #Create group groupadd admin #View group information tail /etc/group #Add test3 user to admin additional group usermod -G […]
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Time：2021-7-27
Statement: the following contents are my personal understanding. If you find any errors or questions, you can contact me for discussion Introduction to reptiles Crawler is a program that automatically grabs information and data on the network according to certain rules. We are in an era of big data, and we can get the data […]
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Time：2021-7-27
A boring task It all started years ago. At that time, I just joined a new company, and the project manager assigned me a relatively simple job to sort out a metadata table for all database fields. Because many of the project documents are incomplete, it is necessary to organize a basic dictionary. If it […]
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Time：2021-7-27
Stop B server downtime accident, HTTP short board exposure, IPFs / fil distributed storage solution! On the evening of July 13, station B collapsed and ranked third on the microblog hot list. “Sorry, the server is temporarily shut down, and the prompt” B “appears. The Internet is based on HTTP protocol. HTTP protocol is a […]
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Time：2021-7-26
Routing meta information Nameserver routing implementation class: org.apache.rocketmq.namesrv.routeinfo.routeinfomanager. Before understanding routing registration, let’s first look at what information nameserver stores. private final HashMap<String/* topic */, List<QueueData>> topicQueueTable; private final HashMap<String/* brokerName */, BrokerData> brokerAddrTable; private final HashMap<String/* clusterName */, Set<String/* brokerName */>> clusterAddrTable; private final HashMap<String/* brokerAddr */, BrokerLiveInfo> brokerLiveTable; private final HashMap<String/* brokerAddr */, […]
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Time：2021-7-26
background When WeChat official account was developed, one of them received ordinary news and received events to push API. There’s a rule, ” If the wechat server fails to receive a response within five seconds, it will disconnect and re initiate the request. It will retry three times in total. If the server cannot […]
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Time：2021-7-25
Redis cluster mission protocol Hello, I’m Li Xiaobing. Today, I’ll talk about the mission protocol and cluster operation of IDS cluster. The mind map of the article is as follows. Introduction to cluster mode and mission In the field of data storage, when the amount of data or request traffic is large to a certain […]
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Time：2021-7-24
introduce Oshi is Java’s free JNA based (native) operating system and hardware information base. It does not need to install any other native libraries, and aims to provide a cross platform implementation to retrieve system information, such as OS version, process, memory and CPU utilization, disk and partition, device, sensor, etc. Functions supported by oshi […]
