Vert.x 3 init.d Script
Let’s say you have a Vert.x 3 application you want to install on a Linux server. But you want the old school way (I mean not the Docker way ☺). So, in other words, you need an init.d script. This post proposes an init.d script that you can use to start/stop/restart a Vert.x 3 application.
The proposed script assumes your application is packaged as a fat jar. So, your application is going to be launched using
java -jar your-fat-jar ....
The init.d scripts have to reply to a set of commands:
start: starts the application (if not yet started)
stop: stops the application (if started)
status: let you know if the application is started or not
restart: restart the application
These commands are invoked using:
service my-service-script start service my-service-script stop service my-service-script status service my-service-script restart
In general, service scripts are hooked in the boot and shutdown sequences to start and stop automatically during the system starts and stops.
So, enough talks, let’s look at the script:
Using the script
First download the script from the here.
You need to set a couple of variables located at the beginning of the file:
# The directory in which your application is installed APPLICATION_DIR="/opt/my-vertx-app" # The fat jar containing your application APPLICATION_JAR="maven-verticle-3.0.0-fat.jar" # The application argument such as -cluster -cluster-host ... APPLICATION_ARGS="" # vert.x options and system properties (-Dfoo=bar). VERTX_OPTS="" # The path to the Java command to use to launch the application (must be java 8+) JAVA=/opt/java/java/bin/java
The rest of the script can stay as it is, but feel free to adapt it to your needs. Once you have set these variables based on your environment, move the file to
/etc/init.d and set it as executable:
sudo mv my-vertx-application /etc/init.d sudo chmod +x my-vertx-application
Then, you should be able to start your application using:
sudo service my-vertx-application start
Depending to your operating system, adding the hooks to the boot and shutdown sequence differs. For instance on Ubuntu you need to use the
update-rc.d command while on CentOS
chkconfig is used
That’s all, enjoy !
One of the interesting features of NoSQL databases is their schema-less mode of operation. This feature is very useful during project prototyping and early development since at early the stages of development of projects all data structures are not clear or have been defined yet.
Vert.x Web distinguishes itself from traditional application servers like JavaEE by just being a simple extension toolkit to Vert.x, which makes it quite lightweight and small but nevertheless very powerful.