MySQL replication is a process that allows you to easily maintain multiple copies of a MySQL data by having them copied automatically from a master to a slave database. Replication enables data from one MySQL database server (the master) to be copied to one or more MySQL database servers (the slaves). Replication is asynchronous by default; slaves do not need to be connected permanently to receive updates from the master. Depending on the configuration, you can replicate all databases, selected databases, or even selected tables within a database.MySQL is one of the most popular open source relational database management system (RDBMS). When your traffic grows then you need to increase the instances of your mysql server and have to replicate the data on multiple servers. MYSQL provide 2 ways to replicate data, master – master and master – slave.
What does Virtualization mean?
The simple explanation is that you create a virtual version of something that’s generally used for some type of execution. For example, if you were to partition a basic hard drive to create two hard drives, then they would be two ‘virtualized hard drives,’ as the hardware is technically a single hard drive that was digitally separated into two.Virtualization refers to the creation of a virtual resource such as a server, desktop, operating system, file, storage or network.
what are Containers?
Containers are a lightweight virtualization technology.In IT it is all about the need to run an application, not a virtual machine.In the end, it is the application user that has a need.This need is to run the application and no user will ever ask for a virtual machine.That is exactly one of the major design goals of the container technology.
A container is a virtualization method at the OS level.This allows multiple instances of an os to be running on the same kernel, which allows for a more efficient usage of available resources.
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Simple bash script to scan open port of any machine in network without any tool like nmap or any other.