sys_daemon

Class Excercise

Logger

For the creation of the logger, execute next command in the directory where Makefile is:

make

This will generate a static library called libfile_log.a as the file file_log.o.

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In order to clean files created (.o .a):

make clean

Run service

Once archives are generated, we can install the service by following the next steps:

• Inside file file_chkc.service change path_to_executable with the directory where the logger is placed
• Copy file_chkd.service inside directory /etc/systemd/system/:

sudo cp file_chkd.service /etc/systemd/system/

Note: Don't forget to run it as sudo, otherwise it will throw permission denied.

• Reload and notify system that a new .service is placed:

sudo systemctl daemon-reload

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Service status

To init, stop and see status of the unit, we can use the script filecheck by using one of these commands:

• Start service:

./filechkd start

• Stop service:

 ./filechkd stop

• See service status:

 ./filechkd status

Makefile

The Makefile file first creates the file_log.o by using -lsystemd cause journal is not present as a static library but as dynamic. After that, it creates the lib libfile_log.a and it uses the static library in order to compile and generate the watcher.

Filecheck Script

The script is quite simple. We define the name of the service and we simple make system calls in order to start/stop it. As an example:

start() {
    echo "Initiating service..."
    sudo systemctl start ${service}
    echo "Service is running..."
}

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References

This README.md is availble in spanish in the this link.