Difference between revisions of "Zynthian SystemD Startup"

From ZynthianWiki
Jump to navigation Jump to search
Line 39: Line 39:
  
 
[[File:Visual Studio unit scripts.png|left|600px]]
 
[[File:Visual Studio unit scripts.png|left|600px]]
 +
<br clear=all>
 +
Things to notice:
 +
=== Config-On-Boot Service ===
 +
* It occurs before the jack2 service. So zynthian is really just a big jack2 engine :-)
 +
* It's a one time fire
 +
* The Environment files are all set here
 +
* /zynthian/zynthian-sys/sbin/config-on-boot.sh then does the actual setup.

Revision as of 14:41, 15 October 2021

Zynthian systemD startup

When playing with a Zynthian never forget this is all just Linux underneath. And at the moment ( October 2021) that means you are going to be using Systemd, the latest in several methods of starting up a system. It seems to do things reasonably quietly and primarily revolves around unit file which are chunks of start up procedure with dependencies on other services right back to bare metal.

You have two primary ways of interacting

  • systemctl
  • journalctl

systemctl

This allows maintenance of the systemd environment allowing you to stop, start and extract a status from the running services that SystemD is managing.

Just typing systemctl on the command line. Gives us over a hundred running services..

Systemctl output.png

and as with most things in linux it's left up to you to strip out the good stuff using word filters like grep and a unix pipe. . .

Systemctl-grep-zynthian.png

As you can see the -all option shows services in all states, and indeed you can ask systemctl to give up far more information using the status command on a specific service .

Systemctl-status-zynthian.png

Shows us the status of various zynthian services.
Notice they all very kindly tell you where these unit files are located. . .

  • Loaded: loaded (/etc/systemd/system/zynthian-webconf.service; enabled; vendor preset: enabled)
  • Loaded: loaded (/etc/systemd/system/zynthian.service; enabled; vendor preset: enabled)
  • Loaded: loaded (/etc/systemd/system/zynthian-config-on-boot.service; enabled; vendor preset: enabled)


The first two services zynthian & zynthian-webconf are both running whilst zynthian-config-on-boot has done it's thing about 2 days ago . . . Active: inactive (dead) since Wed 2021-10-13 10:52:30 BST; 2 days ago.

and here are the files:

Visual Studio unit scripts.png


Things to notice:

Config-On-Boot Service

  • It occurs before the jack2 service. So zynthian is really just a big jack2 engine :-)
  • It's a one time fire
  • The Environment files are all set here
  • /zynthian/zynthian-sys/sbin/config-on-boot.sh then does the actual setup.