Linux can't find process started by PHP

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Answer 1

To create a service using systemd :

Create a file in /etc/systemd/system/ called minecraft-server.service with the following content:

[Unit]
Description=Minecraft server 
After=network.target
StartLimitIntervalSec=0

[Service]
Type=simple
Restart=always
RestartSec=1
User=minecraft
Group=appmgr
ExecStart=java -Xmx4G -Xms4G -jar server.jar

[Install]
WantedBy=multi-user.target

Replace server.jar with full path.

Now lets create the new group and user.

To create new group run the following command:

sudo groupadd appmgr

Now lets create the new user and it it to a group.

sudo useradd –G appmgr minecraft

Now your service is created, we need to enable it and run it for first time.

systemctl enable minecraft-server
systemctl start minecraft-server

Last step to write php script to restart the services:

<?php 
    exec("systemctl restart minecraft-server");
?>