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Linux More

Linux counts the number of occurrences of a character in a file

In Linux, you can use the command line tools "grep" and "wc" to count the number of occurrences in the file

The self-built email service is not limited by the amount of emails sent, and the cost of sending emails in batches is lower, but the deployment is relatively complicated and it is easy to go into the trash. However, more and more service providers have already developed products that support one-click deployment, which greatly reduces the difficulty of deployment and use.

Python More

PYTHON CDP Network.Response

CDP is the abbreviation of Chrome DevTools Protocol. It provides the ability to interact with the Chrome browser. You can communicate with Chrome through CDP to obtain browser status information, perform operations, etc. Network.Response is a domain (Domain) in CDP, which provides information related to network request responses.

PHP More

Fastadmin custom popup using selectpage

Web More

Vue timer "repeat" opening problem

The timer is started multiple times. Causing page functionality to become confusing. How to solve this problem? Use global variables instead of definitions in data

Detailed explanation of Vue ref ($refs) usage 08-10
Add Flashlight Effects to Web Pages 11-14
What's new in ES2022? 03-10
iOS Unsigned Packaging 02-05
2021 windows_build_tools step on the pit installation document 01-05
Detailed explanation of Web 1.0, Web 2.0 and Web 3.0 12-26
2021 uni-app iOS 100% launch guide 12-12
PHP + JS to achieve upload progress bar 12-12
JS judges whether the user opens the console 12-10
Three simple ways to center CSS Div 12-10
Detailed WebSocket 11-19
Use window.onerror() to catch global JS errors 10-24
Simple lazy loading of the web 10-24
HTML5 video picture-in-picture mode 10-24
3 unusual but useful HTML elements 10-24

Nginx More

Nginx reports an error when calling encrypted Lua and cannot load incompatible bytecode

If Luajit is used for encryption, the same version of Luajit should also be used for decryption.

Kubernetes More

Basic Concepts of Kubernetes RBAC

When we use kind K8s to create various objects, the default user is the admin user, which has all the permissions to manage the cluster. In a real multi-user scenario, we cannot all use the admin user, and we need to assign appropriate permissions to different users according to the situation. .

Elasticsearch More

Fix Elasticsearch log4j vulnerability

Fix Elasticsearch log4j vulnerability in 3 steps

Laravel uses Elasticsearch 02-01
Elasticsearch7 related installation 07-13

Terraform More

Terraform creates multiple ECS instances

This article describes how to use the Terraform module to create multiple ECS instances in batches

Terraform AWS ECS + Load Balancer Tutorial 05-11
Terraform ECS uses the Github ghcr.io Private mirror 05-11
Terraform for_each usage example 04-26
Terraform AWS S3 Bucket example 03-19
terraform aws lambda example 03-19
Terraform Search Team Repo Topics 03-18
Terraform Operations GitHub 03-17
Detailed explanation of Terraform Provider 07-12
Terraform tfstate state storage management 07-12
Terraform aws_iam_access_key + keybase best practice 06-05
Terraform Creates AWS EKS Manager Role 06-05

AWS More

Deep Dive into IAM PassRole

As an AWS security best practice, it's best to have narrow-scoped IAM policies so that users are only authorized to perform actions on the resources they expect. This is even more important when you plan to authorize users to run some code in AWS services (for example, in a lambda function to access other resources). In this case, IAM provides a way to standardize the roles that authorized users can grant to AWS services: IAM PassRole

AWS IAM Basic Concepts 06-07
AWS Internet Gateway and NAT Gateway 06-01

Full Stack Developer More

How to disable Hyper-V in command line?

How to disable Hyper-V in windows command line?

Golang More

Go implementation of port scanner

Use GO to scan server ports in batches

Go Redis distributed lock 02-04
Build Go Dockerfile 12-23
Basic knowledge of Go/Golang entry 09-15
WebSocket communication between two Go programs 09-01

Security More

Basic concepts of cryptography

Cryptography is not only a method of providing information security, but also a collection of mathematical techniques. There is no doubt that cryptography is a discipline that mainly exists to deal with information security.

Detailed graphics and text CORS 08-09

WeChat Dev More

Detailed explanation of WeChat service account access payment function

There are many WeChat platforms involved in WeChat Pay. Moreover, the official documents for WeChat access are messy, and there is no good description of the access process.

Scan the QR code to open the applet 10-20

Database More

2022 SQL optimization skills to improve performance by 10 times

sql optimization is a hot topic that everyone is concerned about. Whether you are in an interview or at work, you are likely to encounter

Deep Learning More

indices should be either on cpu or on the same device as the indexed tensor (cpu)

Blockchain More

ETH query transaction records of an address

Apikey needs to be applied for. Apikey is a parameter that is needed to call those interfaces in etherscan. It needs you to apply for it and you can get it after registering an account. Each account holds up to 3 tokens, request API service service, only one of them is required