Programmer Help

1, Linux basic installation and use Linux Installation idea: VM virtual machine installation system, not graphical interface. The system version is CentOS7. Basically, the next step can be completed in turn. 1. Change IP address Note that the network uses bridging (not copying the physical network), so that the virtual machine and the physical ...

[Question and answer] You know HTTP Status code? Please introduce it casually. ------------------------------------------------------------------------------------- From: front end engineer advanced detection reference resources: 100 Continue Continue, usually sending post The request was sent http header After that, the server will return ...

tcpdump Filter conditionType: host, net, port, portalDirection: src, dstProtocols: tcp, dup, ip, wlan, arpMulti condition combination: and, or, not Introduction to tcpdump filter statement You can pass a "filter expression" to tcpdump to filter network packets, and you can pass in a single or multiple filter expressions. You can use t ...

Opencv - python 1. IO operation of image 1.1 reading images 1.API cv.imread() Parameters: Image to read Flag of reading mode cv.IMREAD*COLOR: load the image in color mode, and the transparency of any image will be ignored. This is the default parameter. cv.IMREAD*GRAYSCALE: load the image in grayscale mode cv.IMREAD_UNCHANGED: lo ...

Annotation and reflection annotation What is annotation? Annotation is a new technology introduced from JDL 5.0 Not the program itself, you can explain the program (this is no different from the comment)Can be read by other programs (such as compiler)Annotations exist in the code as "@ annotation name". You can also add param ...

Just look at the title, you may not understand what I'm talking about. We usually create a coroutine and run a section of logic. The code is about this long. package main import ( "fmt" "time" ) func Foo() { fmt.Println("Print 1") defer fmt.Println("Print 2") fmt.Println("Print 3") } func main() { go Foo() fmt ...

catalogue 1, rsync remote synchronization 1. Introduction to rsync 2. Synchronization mode 3. rsync command 4. Configuration mode 5. Operation (downlink replication) 2, inotify 1. Introduction 2,inotifywait 3. Operation test 1, rsync remote synchronization 1. Introduction to rsync rsync is an open source, fast, multi-functional t ...

KVM network configuration Bridged Networking nat network Isolated network (host mode only) You can determine whether there are two interfaces on the same line by checking whether the mac addresses are consistent [root@youngfit ~]# brctl show bridge name bridge id STP enabled interfaces virbr0 8000.5254003c2 ...

Introduction to distributed unique ID The globally unique id of a distributed system is a scenario encountered by all systems. It is often used in search and storage as a unique identification or sorting, such as the globally unique order number and coupon code of a coupon. If two identical order numbers appear, it will undoubtedly be a huge b ...

1, What is Websocket? 1. Application scenario of websocket Technology Use java technology to quickly learn a simple online chat room system. The system has strong scalability. It can make online customer service system, web version of wechat, QQ instant messaging system, etc. according to business needs, use more popular technology and adopt ...