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Deploy Sharded Cluster with Keyfile Access Control 1. Create a configuration server replication set 1.1 Create database folders mkdir -p /configdb/{conf,data,log} 1.2 Generate keyfile file openssl rand -base64 756 > /db/conf/keyfile chmod 400 /db/conf/keyfile After generation, all nodes in the cluster use the ...

By Hua Hua - December, 5th 2015 What is? SFTP ？ In understanding SFTP Before that, let's look at what it is. FTP . FTP( File Transfer Protocol )File Transfer Protocol It is a method commonly used to transfer files between two terminal systems. SFTP ...

                     Can you open the local exe file on the web page? Simon said: Yes. The methods are as follows:   1. Define a private protocol that points to the local exe 2. Use this private protocol as a URL on the web page and click on it to open the exe. 3. The URL can also contain parameters that are passed to the exe 1 ...

System mirroring The i386 in the Ubuntu image file is the i386 level CPU instruction set program of intel's x86 architecture.The corresponding is amd64, which is the 64-bit instruction set of x86 extended by amd. Also, ppc is very common. This is the instruction set for IBM's PowerCPU architecture.Intel has used 8086, 80286, 80386 and so on as ...

Operation modes and symbols: Operational Symbolic Meaning (*Common for Marking) +, -addition, subtraction *, /,%Multiplication, Division, Remaining **Power operation ++, --self-increasing, self-decreasing <,<=,>,>=Comparison Symbol =, +=, -=, *=, /=,%=assignment For example, a+=1 equals a=a+1 Common operatio ...

Spring provides profile features to isolate our configuration files so that the corresponding configuration items can be activated in different environments; it is easy to achieve uniform deployment of different configuration items in different environments; Recently, in spring+dubbo's service project, we want to load differen ...

Catalog 4. Update data 4. Update data (1)update() In MongoDB, update() functions can be used to perform data update operations. The function takes three main parameters: criteria, objNew and option. The parameter criteria can be used to specify a query that selects the target record to be updated. Use the objNew parameter t ...

Catalog 1 Background posture 2 foreplay 3 dinner 4 systemctl stop docker 5 demo 1 Background posture drive Driver, full name device driver, is a special program added to the operating system, which contains information about hardware devices. This information enables the computer to communicate with the corresponding equipment. interrupt A w ...

Class inheritance As for the definition of inheritance of classes, we can understand it more or less as the relationship between father and son. Sons will inherit the attributes and methods of father. The father is the father and the son is the child. Their relationship is the inheritance relationship. Xiaobian here is a Jav ...

Salt introduces a powerful message queue as a communication transmission mechanism. Sometimes we need old tools to be more effective -- salt ssh. Official documents https://docs.saltstack.com/en/latest/topics/ssh/index.html salt is designed to connect a large number of remote hosts at one time, while SSH (security shell is short for Secure she ...