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Creating a systemd service
Just out of my laziness I was running this wiki by executing corresponding service in the screen, which is not really a good way of hosting an application 24/7 in my opinion. I had to learn to how make a systemd service which will run all this stuff.
And it is actually surprisingly easy. So easy that you can learn how to do it in 5 minutes, and presumably forget how to do it in a day, which is the reason why I am doing this guide...
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Locating executable of an app
Systemd requires absolute location of your executable application, which is generally somewhere at /usr/bin or /usr/local/bin location, looking like /usr/bin/htop in case of our beloved htop
I was executing and running wiki app by using commands below:
$ screen
$ cd /home/myuser/wikidir/
$ retype run