How to deploy Nginx in CentOS

SSH to VPS ssh root@ip Update yum to install Nginx yum -y update Install Nginx yum install nginx Start Nginx and start Nginx when server launch systemctl start nginx systemctl enable nginx Check Nginx status systemctl status nginx Set firewall for visiting sudo firewall-cmd –permanent –zone=public –add-service=http sudo firewall-cmd –permanent –zone=public –add-service=https sudo firewall-cmd –reload …

Solve “Error Establishing Database Connection” on WordPress

Connect to server console. In my case, I just log in digitalocean and click console from my droplet. Check mysql status: sudo netstat -plt If we can’t see mysql appear in output from previous step, restart mysql manually: sudo systemctl start mysql Problem should be fixed if you are lucky 🙂

Spring – AOP

Aspect Oriented Programming with Spring Aspect-oriented Programming (AOP) complements Object-oriented Programming (OOP) by providing another way of thinking about program structure. The key unit of modularity in OOP is the class, whereas in AOP the unit of modularity is the aspect. Aspects enable the modularization of concerns (such as transaction management) that cut across multiple …

Spring – IoC

Introduction This Blog covers the Spring Framework implementation of the Inversion of Control (IoC) principle. From Spring official document, IoC is also known as dependency injection (DI). It is a process whereby objects define their dependencies (that is, the other objects they work with) only through constructor arguments, arguments to a factory method, or properties …

Intent In Android Studio

Build an intent An Intent is an object that provides runtime binding between separate components, such as two activities. The Intent represents an app’s intent to do something. You can use intents for a wide variety of tasks, but in this lesson, your intent starts another activity. In MainActivity, add the EXTRA_MESSAGE constant and the …