![]() ![]() These processes are called daemons and the programs that run as daemons often end with a d to indicate so.įor example sshd, the SSH daemon, is the program responsible for listening to incoming SSH requests and checking that the remote user has the necessary credentials to log in. ![]() ![]() In Linux, systemd (the system daemon) is the most common solution for running and setting up daemon processes. You can run systemctl status to list the current running daemons. Most of them might sound unfamiliar but are responsible for core parts of the system such as managing the network, solving DNS queries or displaying the graphical interface for the system. Systemd can be interacted with the systemctl command in order to enable, disable, start, stop, restart or check the status of services (those are the systemctl commands). More interestingly, systemd has a fairly accessible interface for configuring and enabling new daemons (or services).īelow is an example of a daemon for running a simple Python app. We won’t go in the details but as you can see most of the fields are pretty self explanatory. Description = My Custom App After = network.target User = foo Group = foo WorkingDirectory = /home/foo/projects/mydaemon ExecStart = /usr/bin/local/python3.7 app.py Restart = on-failure WantedBy = multi-user.targetĪlso, if you just want to run some program with a given frequency there is no need to build a custom daemon, you can use cron, a daemon your system already runs to perform scheduled tasks. Modern software systems are usually composed of smaller building blocks that are composed together. ![]()
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