EuroAP as a systemd service

The EuroAP platform can run as a service on all supported operating systems. The following demonstration shows how to run EuroAP as a systemd service under the EuroLinux 8 operating system. Since EuroAP is built on top of and functionally compatible with the Red Hat^® JBoss^® EAP source code, this tutorial is also applicable in a JBoss^® context.

To begin, download the EuroAP archive from the EuroLinux Customer Portal and extract it to the current directory

unzip EuroAP*

Move the extracted directory to the /opt directory:

sudo mv EuroAP-*/ /opt/EuroAP

Install the required version of OpenJDK:

sudo dnf install -y java-11-openjdk

Add the euroap system user and create a password for them:

sudo useradd euroap && sudo passwd euroap

We grant this user the owner privileges of the /opt/EuroAP directory with the command:

chown -R euroap:euroap /opt/EuroAP

We create a EuroAP application user from the system user euroap’s level:

su euroap -c /opt/EuroAP/bin/add-user.sh

Navigate to the init.d subdirectory of the project:

cd /opt/EuroAP/bin/init.d

and run the command that copies the configuration file and launcher script:

sudo cp *.sh euroap.sh && sudo cp *.conf euroap.conf

In the euroap.conf configuration file uncomment and edit the JBOSS_HOME variable directing it to the /opt/EuroAP directory, as well as the JBOSS_USER variable assigning it the euroap user. In addition, uncomment the variables JBOSS_MODE=standalone and JBOSS_CONFIG=standalone.xml and save the file.

Perform an automatic editing of the JBOSS_NAME variable in the launcher script:

sudo sed -i "s/JBOSS_NAME='.*'/JBOSS_NAME='euroap'/g" euroap.sh

Copy the modified service configuration file to the /etc/default directory:

sudo cp /opt/EuroAP/bin/init.d/euroap.conf /etc/default

Then copy the launcher script to the /etc/init.d/ directory:

sudo cp /opt/EuroAP/bin/init.d/euroap.sh /etc/init.d

We give the script running the service the initrc_t SELinux context:

sudo /sbin/restorecon -v /etc/rc.d/init.d/euroap.sh

After running the command, a message should be displayed:

Relabeled /etc/rc.d/init.d/euroap.sh from unconfined_u:object_r:etc_t:s0 to unconfined_u:object_r:initrc_exec_t:s0

Next, we create the euroap.service file in the /etc/systemd/system directory:

sudo vim /etc/systemd/system/euroap.service

and add the following content to it:

[Unit]
    Description=EuroAP Systemctl script
    After=NetworkManager.service

[Service]
    Type=forking
    ExecStart=/etc/init.d/euroap.sh start
    ExecStop=/opt/EuroAP/bin/init.d/euroap.sh stop
    ExecReload=/opt/EuroAP/bin/init.d/euroap.sh restart
       
[Install]
    WantedBy=multi-user.target

Save and close this file and reload systemd daemon:

sudo systemctl daemon-reload

Now we can start our new service using the standard command:

sudo systemctl start euroap

After a few seconds or so, check that EuroAP hosts its administration panel. To do so, visit http://localhost:9990.

We can display the status of the service with the standard systemd command:

sudo systemctl status euroap

Below is an example of the result of this command:

● euroap.service - EuroAP Systemctl script
   Loaded: loaded (/etc/systemd/system/euroap.service; static; vendor preset: disabled)
   Active: active (running) since Fri 2023-02-24 05:48:22 EST; 36min ago
  Process: 34267 ExecStart=/etc/init.d/euroap.sh start (code=exited, status=0/SUCCESS)
 Main PID: 34286 (standalone.sh)
    Tasks: 56 (limit: 23512)
   Memory: 329.3M
   CGroup: /system.slice/euroap.service
           ├─34286 /bin/sh /opt/EuroAP/bin/standalone.sh -c standalone.xml
           └─34405 java -D[Standalone] -server -Xlog:gc*:file=/opt/EuroAP/standalone/log/gc.log:time,uptimemillis:filecount=5,filesize=3M -Xms1303m -X>

Feb 24 05:48:18 el8 systemd[1]: Starting EuroAP Systemctl script...
Feb 24 05:48:18 el8 runuser[34284]: pam_unix(runuser:session): session opened for user euroap by (uid=0)
Feb 24 05:48:18 el8 runuser[34284]: pam_unix(runuser:session): session closed for user euroap
Feb 24 05:48:18 el8 euroap.sh[34267]: Starting euroap: /
Feb 24 05:48:22 el8 euroap.sh[34267]: [  OK  ]
Feb 24 05:48:22 el8 systemd[1]: Started EuroAP Systemctl script.

We can stop the service with the standard systemd command:

sudo systemctl stop euroap

We can also set the service to start with the start of the operating system with the standard systemd command:

sudo systemctl enable euroap --now

Summary

By configuring EuroAP as a systemd service, it is possible to easily manage EuroAP's resources, such as RAM, CPU and disk memory. The systemd service also ensures uninterrupted operation of EuroAP after a server restart. Systemd provides tools to easily manage application logs and allows you to control the application process, including monitoring its status, stopping, resuming and restarting. As you can see, the solution has many advantages for easy, efficient and secure management of the EuroAP application in a server environment.