initial commit

system/systemd/basic commands

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+> systemctl list-units
+
+> sudo systemctl status mpd
+
+> sudo systemctl daemon-reload
+
+> sudo systemctl taskd.service start
+
+> sudo systemctl status taskd.service

system/systemd/journal.md

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+
+Find errors since November
+
+> journalctl --since=2018-11-01 --grep="EXT4-fs error"
+
+Limit size to 2G.
+
+> journalctl --vacuum-size=2G

system/systemd/making services.md

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+# Basics
+
+A service can consist of two files - the .sh script to run, and the .service file which describes its run conditions.
+
+The .service file goes in /etc/systemd/system.  The scripts themselves might be best placed in $HOME/.local/bin.
+
+# Example - tracker.service
+
+```
+[Unit]
+Description=Tracker
+
+[Service]
+Type=simple
+ExecStart=/path/to/script
+
+[Install]
+WantedBy=multi-user.target
+
+
+```
+
+After making the new service, systemd requires reloading:
+
+> sudo systemctl daemon-reload
+
+# Types
+
+* simple - the service cannot be called on by others.  It runs on repeat.
+
+* oneshot - the service executes once, then stops.
+
+
+

system/systemd/test.service

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+[Unit]
+
+Description=Test
+
+[Service]
+
+ExecStart=/home/ghost/.local/bin/test
+
+Restart=always
+
+Type=simple
+
+User=ghost
+
+Group=ghost
+
+[Install]
+
+WantedBy=multi-user.target
+
+Alias=test.service
+
+

system/systemd/users.md

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+# Automatic Login
+
+> cp /usr/lib/systemd/system/getty@.service /etc/systemd/system/getty1@.service 
+
+Modify the lines to look like these:
+
+`ExecStart=-/sbin/agetty --autologin <username> --noclear %I 38400 linux`
+
+`Type=oneshot`
+
+`Restart=no`
+
+In the `[Install]` section:
+
+`Alias=getty.target.wants/getty@tty1.service`
+
+Then enable the service:
+
+> ln -sf /etc/systemd/system/getty1@.service /etc/systemd/system/getty.target.wants/getty@tty9.service
+
+> systemctl start getty@tty9.service
+
+