VPS in CentOS7, run Files JAVA on start my vps - linux

Question

my vps in centos 7 ,
I have applications developed in java, 3 files .jar .
I need to run this files when my vps start or log-in, like example "java -jar file-name"
how i can run that file like service
i have the second question is,
what is the file in centos that has the list of services that run when you start centos.
For edit that file and add my jar. files

Answer 1

The second questions:
CentOS uses systemd to start system-wide or user-defined services. You can use systemctl to find out. For example, checking out the SSH server daemon, we can do:
[user1#centos Good]$ systemctl | grep ssh
sshd.service loaded active running OpenSSH server daemon
You can write your own .service file and put it under one of the following directories to make your java program run like a service.
/usr/lib/systemd/system/
/lib/systemd/system/
To know more about systemd and .service file, you can check CentOS / RHEL 7 : Beginners guide to systemd
edit: 2019-11-13 18:53:47
//java_program.service
[Unit]
Description=java_program
[Service]
Type=simple
User=root
ExecStart=/usr/bin/java -jar /root/folder/name.jar
RestartSec=5
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=always
[Install]
WantedBy=multi-user.target
Place java_program.service at path /usr/lib/systemd/system/java_program.service
Run command:
sudo systemctl enable java_program
sudo systemctl start java_program