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Difference between revisions of "ECE497 Notes on systemd"

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m (Added systemd for Admins)
m (systemd for Admins now points to part 20)
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[http://crashmag.net/useful-systemd-commands Here] is a nice list of useful commands.
 
[http://crashmag.net/useful-systemd-commands Here] is a nice list of useful commands.
  
[http://0pointer.de/blog/projects/systemd-for-admins-4.html systemd for Admins]
+
[http://0pointer.de/blog/projects/socket-activated-containers.html systemd for Admins]
  
 
[http://www.freedesktop.org/wiki/Software/systemd/TipsAndTricks Tips and Tricks]
 
[http://www.freedesktop.org/wiki/Software/systemd/TipsAndTricks Tips and Tricks]

Revision as of 16:30, 8 October 2013

thumb‎ Embedded Linux Class by Mark A. Yoder


The new BeagleImages use systemd for user space initialization.

Here, here and here are some tutorials that look good.

Here is information on runlevels.

Here is a nice list of useful commands.

systemd for Admins

Tips and Tricks

Gadgets

I found these gadgets

network-gadget-init.service  storage-gadget-init.service

in

/lib/systemd/system
/usr/bin/update-image-info-on-mmcblk0p1.sh

is what creates the info.txt file.

beagle$ mount /dev/mmcblk0p1 /mnt

Here's a way to see what gadgets are out there

beagle$ systemctl --all | grep gadget
sys-devi...et-usb0.device loaded active   plugged       /sys/devices/platform/omap/musb-ti81xx/musb-hdrc.0/gadget/net/usb0
network-...t-init.service loaded active   exited        Start USB Ethernet gadget
storage-...t-init.service loaded inactive dead          Start usb mass storage gadget
udhcpd.service            loaded active   running       DHCP server for USB0 network gadget

or

systemctl --all --full | grep gadget
sys-devices-platform-omap-musb\x2dti81xx-musb\x2dhdrc.0-gadget-net-usb0.device                loaded active   plugged        /sys/devices/platform/omap/musb-ti81xx/musb-hdrc.0/gadget/net/usb0
network-gadget-init.service                                                                   loaded active   exited         Start USB Ethernet gadget
storage-gadget-init.service                                                                   loaded inactive dead           Start usb mass storage gadget
udhcpd.service                                                                                loaded active   running        DHCP server for USB0 network gadget

Where

network-...t-init.service = network-gadget-init.service
storage-...t-init.service = storage-gadget-init.service

/etc/udhcpd.conf is what assigned 192.168.7.1 to the host computer.

To stop the ethernet over USB and start the storage over USB for the current session

beagle$ /bin/systemctl stop  storage-gadget-init.service
beagle$ /bin/systemctl start network-gadget-init.service

To go the other way:

beagle$ g-ether-start-service.sh

To keep the storage gadget from running on boot up. (I'm still checking this.)

beagle$ systemctl disable storage-gadget-init.service




thumb‎ Embedded Linux Class by Mark A. Yoder