How to start daemons safely?

Question

linux

You need to start the daemon, and not just start it, but add it to startup, but it is not entirely trusted, there is a possibility that there may be something not good inside. How would you advise to run it so that it could not harm the system?
I created a separate account and group, threw the demon into the directory of this user, what to do next is not entirely clear.

Answer 1

Such cases are provided by systemd.
create either in ~/.config/systemd/user/
or in /etc/system/<daemon>@user.service
file

[Unit]
Description=my daemon


[Service]
ExecStart=/usr/bin/lnav 
Restart=on-failure
SuccessExitStatus=3 4
RestartForceExitStatus=3 4

[Install]
WantedBy=default.target

and than

systemctl enable демон@myuser.service
systemctl start демон@myuser.service

I strongly advise you to read the Documentation - it is clearly written.
Z.Y. There's more

After=
Requires=

for dependency management syncthing
example