Check status of a service 1.      systemctl status servicename(httpd) It shows the status of the service it started or stoped 2.      wh...

The structure of Java is given below Documentation section Package statement Import statement Interface statement Main method c...

  Certificate verification failed: The certificate is NOT trusted. The certificate chain uses expired certificate.  Could not handshake: Err...

The features of Java is given below 1. Object oriented:  Java is object oriented programming language. 2. Simple : Shimla with C an...

Remove the Oracle's Java folder:  $ sudo rm -r /usr/lib/jvm/java-11-oracle Install OpenJDK 8 from APT: $ sudo apt install openjdk-8-jdk ...

  Src  https://docs.docker.com/engine/swarm/how-swarm-mode-works/nodes/ Docker Swarm : Docker swarm is a container orchestration clusterin...

1.      Create key pair s (In Ec2 dashboard go to key pairs à give project name à select pem for git bash or ppk for putty login) 2.     ...