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Nat type description and type detection

. Symmetric Nat does not guarantee the consistency between the private and public IP addresses in all sessions. Instead, it assigns a new port number for each new session. The full name of the STUN Protocol is simple traversal of user datateprotocol through network address translators. The main function is to check whether it is behind Nat. If it is behind Nat, what is the address and port after Nat translation? In addition, you can check the NAT type. Now machine A is connected to machine B.

2. How to optimize operations on large data databases (improve SQL statements)

optimizer can automatically optimize queries based on the where clause, it is still necessary for you to understand the working principle of the "query optimizer". If not, sometimes the query optimizer does not perform quick queries according to your intention. In the query and analysis phase, the query optimizer checks each stage of the query and determines whether the data volume to be scanned is useful. If a phase can be used as a scan parameter (SARG), it is called an Optimized phase and th

MySQL transaction, concurrency problem, lock mechanism

1. What is a transactionA transaction is a combination of one or more database operation statements with acid,4 characteristics.Atomicity: Either all succeeds or all is undoneIsolation: Transactions are independent from one another and are not interfering with each otherConsistency: The database consistency constraint is not compromised after the database has changed state correctlyPersistence: The commit result of the transaction, which persists in the database2. What will happen to the concurr

Build a private Docker Registry on the CentOS7

/CONFIG.D directory. Nginx link to registry container. Creates a registry container based on Registry:2 image, exposes container 5000 ports to host 5000 ports, uses environment variables to indicate the root directory using/data, and mounts the data/folder under the current directory to the/data directory of the container. All also need to create nginx and data folders in the current directory: mkdir Data

Local build of Docker private warehouse registry

reprinted from: https://blog.csdn.net/bxzhu/article/details/73253032 1. Environmental Preparedness Linux version: Centos7 Docker version: 17.05.0-ce 2. Deploying registry Get the image of registry using the Docker pull command [Plain] View plain copy # sudo docker pull registry:2.1.1 Use Docker run to launch a container using the downloaded registry image [Plain] View plain copy # sudo docker run-d-P 5000:5000

Docker builds a local warehouse

The Docker Hub public repository has the following drawbacks:1, strong network dependence, link speed limit;2, privatization of information storage network is not secure3, the privatization of the warehouse need to charge, there is a security riskSolution uses local registryDocker has already said registry open source, and also has an official image on the Docker hub registryWe can use it directly:(1) Start Registry containerShell>docker run-d-P 5000:

Analysis of private attribute inheritance problem in PHP class _php tutorial

Please read this sentence carefully if the parent class has a private property. Then the parent class's method is only a private property service for the parent class. Here's a list of the following to deepen your understanding. This example looks strange, redefining an attribute $sal in a subclass, and the system returns the properties of the parent class. Copy CodeThe code is as follows: Class employee{ Private $sal = 3000; protected $sal = 3000; Public Function Getsal () { return $this->sal

CentOS utilizes Nginx+docker deployment. Netcore Application

Install Docker official documentation https://docs.docker.com/engine/installation/linux/docker-ce/centos/[[emailprotected] ~]# Yum remove docker \ #删除旧版本Docker-common \Docker-selinux \Docker-engine- [[emailprotected] ~]# yum install y yum-utils \\ lvm2\--add-repo \Https://download.docker.com/linux/centos/docker-ce.repo[[emailprotected] ~]# yum install docker-ce #安装docker[[emailprotected] ~]# systemctl start docker #启动dockerdockerVerify that the hello-world installation is correct by running

oracle-Process Function Programming

Label:Process function ProgrammingPractical purpose (1) Master the basic function of stored procedure and storage function advanced database object. (2) Master the creation, modification, viewing and deletion of stored procedures and stored functions. Practice Requirements (1) record the execution of the command and operation of the problems encountered in the process and the solution, pay attention to explain the rationale. (2) records the methods of managing stored procedures, stored functions

PHP calls the UnionPay interface

key.Password Encryption certificate (this is generally not used, please feel free to match)Const Sdk_encrypt_cert_path = ' d:/certs/acp_test_enc.cer ';Visa Verification Path (please go to the folder, do not match the specific documents)Const SDK_VERIFY_CERT_DIR = '.. /testkey/';The directory where the key is storedFront Desk Request AddressConst SDK_FRONT_TRANS_URL = ' https://101.231.204.80:5000/gateway/api/frontTransReq.do ';Background Request Addr

Analysis on private property inheritance in php

First, this question is a bit problematic because the private attribute cannot be inherited. please read this sentence carefully if the parent class has private attributes. The method of the parent class serves only the private attributes of the parent class. The following describes how to use a series of columns. This example looks strange. a new attribute $ sal is defined in the subclass, but the system returns the attribute of the parent class. Copy codeThe code is as follows: Class employe

Analysis of private attribute inheritance problem in PHP class

Please read this sentence carefully if the parent class has a private property. Then the parent class's method is only a private property service for the parent class. Here's a list of the following to deepen your understanding. This example looks strange, redefining an attribute $sal in a subclass, and the system returns the properties of the parent class. Copy the code code as follows: Class employee{ Private $sal = 3000; protected $sal = 3000; Public Function Getsal () { return $this->sal; }

Docker Registry Private Warehouse deployment

Private warehouse service side: 12.40[[Email Protected]_golang ~]# Docker run-d-P 5000:5000-v/opt/data/registry:/tmp/registry-dev--name docker-registry re gistry:2.4[[Email Protected]_golang ~]# Docker PSCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESCEBB252856B1 registry:2.4 "/bin/registry serve" 3 seconds ago up 2 seconds 0.0.0.0:5000->

Customizing LNMP environment Images with Dockerfile

[[emailprotected] ~]# docker tag mysql:lnmp.8.0.12 192.168.2.225:5000/mysql:lnmp.v1[[emailprotected] ~]# docker tag php:7.2.11 192.168.2.225:5000/php:lnmp.v1[[emailprotected] ~]# docker tag nginx:1.15.5 192.168.2.225:5000/nginx:lnmp.v1(4) Upload the image to the private warehouse[[emailprotected] ~]# docker push 192.168.2.225:

Seriously analyze mmap: What is the reason why use "turn"

situations. After the mapping is established, the mappings persist even if the file is closed. Because the map is the address of the disk, not the file itself, and the file handle is irrelevant. The valid address space that can be used for interprocess communication is not entirely limited by the size of the mapped file, because it is map-by-page. In the above knowledge premise, let's look below if the size is not the full multiples of the page in the specific case:Scenario One: The si

PHP calls the UnionPay interface "reprint"

key.Password Encryption certificate (this is generally not used, please feel free to match)Const Sdk_encrypt_cert_path = ' d:/certs/acp_test_enc.cer ';Visa Verification Path (please go to the folder, do not match the specific documents)Const SDK_VERIFY_CERT_DIR = '.. /testkey/';The directory where the key is storedFront Desk Request AddressConst SDK_FRONT_TRANS_URL = ' https://101.231.204.80:5000/gateway/api/frontTransReq.do ';Background Request Addr

J2SE Fast Advanced-multi-thread synchronized

My wife and I went to the bank to collect money One day, and the wife played a bet, now my bank account in a total of 5000 dollars, we go to the bank at the same time to take money, to see if we can both remove 5000来 .... (PS: The price of a bet is: if you can take out 5000, then the 10000 pieces to buy her food!) If you can only take

Analysis of private attribute inheritance problem in PHP class _php skill

Please take a closer look at this sentence if the parent class has a private property. Then the method of the parent class serves only the private property of the parent class. Here is a series of the following to deepen understanding. This example looks odd, redefining a property $sal in a subclass, and the system returns the properties of the parent class. Copy Code code as follows: ? Class employee{ Private $sal = 3000; protected $sal = 3000; Public Function Getsal ()

Docker Practice (ii) Main concepts and commands __docker

The previous section learned and practiced the foundation and installation of Docker, and this section mainly studies the main concepts and commands of Docker Docker has three core concepts: Mirroring, container, warehouse one, mirroring Docker mirroring is a precondition for running a container, and if there is no mirror locally, Docker will attempt to download from the default Mirror warehouse (Docker hub), and users can configure their own private warehouses to download mirrors from a private

Docker Warehouse Use

Docker Public Mirror Market https://hub.docker.com/Warehouses (Repository) are places where images are centrally stored, divided into public warehouses and private warehouses. The registration service is the specific server that holds the warehouse, a registration service can have multiple warehouses, and each warehouse can have multiple mirrors. For example, warehouse address Private-docker.com/ubuntu, private-docker.com is the registered server address, Ubuntu is the warehouse name. Speed Clo

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