[systemd-devel] network consuming user services

[Sebastian Tramp]

On Wed, May 02, 2012 at 03:40:57PM -0700, David Strauss wrote:
> On Wed, May 2, 2012 at 1:19 PM, Sebastian Tramp
> <mail at sebastian.tramp.name> wrote:
> > Are there existing service files which solve a similar or the same issue?
> 
> You may want a target [1]. There is already a network target, but I
> believe it comes up before NetworkManager fully initializes all
> interfaces. I would consider adding a script that fires
> network-fully-up.target once NetworkManager finishes [2].

Hi David, ok thank- using a NetworkManagers dispatch script in combination with
a systemd target is definitely the way to go here.

#!/bin/bash
# /etc/NetworkManager/dispatcher.d/99-systemd-network-fully-up 
INTERFACE=$1
ACTION=$2

case "$ACTION" in
    up)
        systemctl start network-is-up.target
        ;;
    down)
        systemctl stop network-is-up.target
        ;;
esac

> This would allow any service to install as "WantedBy" that target.

yes, starting network-is-up correctly starts fetchmail.service now.

> It's probably also possible to stop the network-fully-up.target on
> disconnection. If services indicating WantedBy=network-fully-up.target also
> have StopWhenUnneeded enabled, they will shut down on stopping that target.

this does not work for me currently. here is my fetchmail.service file. Maybe
you can review it?

[Unit]
Description=Fetchmail

[Service]
Type=simple
ExecStart=/usr/bin/fetchmail --idle
WorkingDirectory=/home/seebi
User=seebi
Group=seebi
StandardOutput=journal
StandardError=journal
StopWhenUnneeded=yes

[Install]
WantedBy=network-is-up.target

> Altogether, this should do what you need as well as provide a general
> facility on your systems for any unit to start and stop based on network
> availability.

> Note: For a target like network-fully-up, it would be bad to try and use
> systemctl isolate in the same way as for the runlevels.

means I should add AllowIsolate=false? Currently my network-is-up.target
consists only of these lines:

[Unit]
Description=Network is fully available

Thank you and Best regards

Sebastian Tramp


> [1] http://0pointer.de/public/systemd-man/systemd.target.html
> [2] http://drewdahl.com/2011/05/03/using-networkmanager-to-run-scripts-after-connecting/

-- 
WebID: http://sebastian.tramp.name
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