There are different ways. You can also use the systemd but as you are asking for init.d use the following command. sudo /etc/init.d/networking start Reference: https://www.poftut.com/start-stop-restart-networking-linux/

You can remove default route by using "ip route dell default via 10.0.0.1 dev eth0" command. For more examples and details look following reference post. https://www.poftut.com/add-change-default-route-default-gateway-ubuntu-lnux/

Hi , Node.js is a single-threaded application, but can support concurrency through the concept of event and callback. Each Node.js API is asynchronous and single-threaded, using async function calls to maintain concurrency. The node uses the observer pattern. The node thread holds an event loop and executes the corresponding event, which sends a signal to the function that listens for the event when a task completes.

Well look to the following page which also explains concepts about mysql connection and objects. reference: https://www.poftut.com/how-to-access-mysql-database-from-java-applications/