Nginx Configure https/Certificate update/Let's encrypt free certificate (HTTPS) as well as error resolution!

Git address is as follows Https:// Calling authentication, obtaining, and updating certificates does not require additional dependencies. downloading scripts and configuration files wg

The difference between session, cookie, token

Session The Chinese translation of the session is "conversation", and when a user opens a Web application, it generates a time with the Web server. The server uses session to temporarily save the user's information on the server, the user leaves the

Block chain Introductory Tutorial __ block chain

The Block chain (blockchain) is now a big hit, with a lot of news media reporting that it will create the future. But there are very few introductory articles that are easy to understand. What is so special about the block chain is that there are few

System v three kinds of IPC programming skillfully learn to remember __ programming

Reprint please keep the original address Overview Three IPC mechanisms (Message Queuing, semaphores, and shared memory) have been invented on System V ("system Five") systems, often referred

Hadoop (1.0.4) Path detailed

Path parses the paths, converts the parameters to the standard URI format, makes judgments about the parameters of the path, standardizes, Fu Hua, and so on. To facilitate understanding of path, You can first see the detailed URI, link http://www.cnb

four ways of MAP traversal

map<string, string> map = new hashmap<string, string> (); Map.put ("Key1", "value1"); Map.put ("Key2", "value2"); Map.put ("Key3", "value3"); The first: universal use, two times value System.out.println ("Through the Map.keyset

Kerberos Basic Installation and configuration

Because of the recent need to use Kerberos authentication for the environment, there is very little understanding of Kerberos before, today, take the time to manually install Kerberos, so as to deepen the understanding of Kerberos. 1 Select a machine

MyBatis Learning Code Generator Generator

MyBatis Generator (MBG) is a MyBatis code generator that helps us generate corresponding entity classes, XML mapper files, interfaces, and help classes based on the design of tables in the database (that is, we can use this class for simple crud oper

GPG encryption and decryption and signature

In Ruan one peak great God's blog ( goes to school gpg. Here after the practice of the record, in fact, mainly changed the layout, convenient for personal use. The key file is saved under ~/.gunpg/ Encr

Spring MVC 4 viewresolver View Parser

All our MVC frameworks have its own mechanism for parsing views, Spring MVC is no exception, it uses Viewresolver for view parsing, and lets users render the model in the browser. Viewresolver is an out-of-the-box technology that resolves multiple vi

Platform bus led driver based on linux2.6.30.4 and s3c2440 __linux

1 basic In the device driver often see and platform related fields, distributed in many corners of the driver, this is also the 2.6 kernel of a more important mechanism, the principle of its understanding, for later analysis of the driver is very hel

Git compile installation with common commands

Git compile installation and common commands =========================================: compiling installation and setting 1.1: Introduction GitHub website address (download source package): Git.git git downloads on systems su

Subnet mask and subnet partitioning--speak clearly

subnet mask and subnet partitioningDirectory: I. Summary The concept and function of subnet mask Third, why do I need to use the subnet mask Four, how to use the subnet mask to get network/host address Five, the classification of subnet mask VI. Subn

Session and cookie differences and connections, session lifecycle, multiple service deployment session Management

The difference between session and Cookie Object Information size Save time Application Range Save location Session Small, simple data User activity time + a delay time (typically 20 minutes) Indiv

tcpdump use commands on Ubuntu to learn notes/tcp, IP, ICMP packet format

-Frequently used commands detailed Basic Commands $ tcpdump//default crawl all packets of the first NIC interface $ tcpdump–i ens33//crawl NIC ENS33 packet $ tcpdump host Listen for host receive all packets sent $tcpdump h

PHY Chip AR8033 Learning Notes

"Introduction to the Chip" AR8033 is the 4th generation 10/100/1000mbps Rate Ethernet PHY chip of Atheros company, which can be used for home gateway, Enterprise switch, mobile base station, optical module and other equipments. The chip uses the RGMI

Varnish authoritative Guide (Chinese)

Turn from: varnish Documentation (translation) index What is varnish? (we need to know what is varnish before reading the article)            

13. Advanced IO and multithreading and thread synchronization

13.1. Blocking and non-blocking io (1) Common blocking functions have wait+pause+sleep functions; Read or write some IO device files (such as serial/mouse/keyboard) can cause blocking The advantage of blocking is that the kernel operating system is


FTP Host name/IP WHERE "hostname/IP" is the host name or IP address of the remote machine to which you want to connect. On the command line, the host name is an option, and if you specify a host name, FTP attempts to connect to the remote computer'

Screen Session command

I. Background System administrators often need SSH or telent to telnet to a Linux server, often running tasks that take a long time to complete, such as system backup, FTP transfer, and so on. Typically, we open a remote terminal window for each of

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