On 12/22/2013 08:07 PM, Bruce Dubbs wrote:
> Armin K. wrote:
>> On 22.12.2013 18:49, Bruce Dubbs wrote:
>
>>> This brings up a question. How does systemd handle bringing up a bridge
>>> and attaching an ethernet connection? In BLFS we do:
>>>
>>> ONBOOT=yes
>>> IFACE=br0
>>> SERVICE="bridge ipv4-static" # Space separated
>>> IP=192.168.0.22
>>> GATEWAY=192.168.0.1
>>> PREFIX=24
>>> BROADCAST=192.168.0.255
>>> CHECK_LINK=no # Don't check before bridge is created
>>> STP=no # Spanning tree protocol, default no
>>> INTERFACE_COMPONENTS="eth0" # Add to IFACE, space separated devices
>>> IP_FORWARD=true
>>>
>>> and the ifup, bridge, and ipv4-static scripts handle it. How is this
>>> done with systemd?
>>>
>>> -- Bruce
>>>
>>
>> Not sure, systemd runs "/sbin/ifup interface" at boot, but requires the
>> "/etc/sysconfig/ifconfig.interface" and interface in /sys/class/net or
>> whatever to be present in order to start it. We might need different
>> unit to configure bridge, and that one might need to have a dependency
>> on classic ifupdown service that configures the interface, so the bridge
>> configuration is started after the interface has been configured properly.
>>
>> I am curious is this how lfs does it? First, it brings up the interface
>> that's being bridged, then it creates the bridge?
>
> In LFS, we basically do:
>
> for S in ${SERVICE}; do
> IFCONFIG=${file} /lib/services/${S} ${IFACE} up
> done
>
> So it brings up the bridge and then ipv4. The bridge script basically does:
>
> brctl addbr ${1}
> for I in ${INTERFACE_COMPONENTS}; do
> log_info_msg "Adding ${I} to ${1}..."
> brctl addif ${1} ${I}
> evaluate_retval
> done
>
> And then the ipv4-static script runs. Note that in this configuration,
> the eth0 interface does not have the IP address. It's only needed by
> the bridge device.
>
> The only reason that I know of for this configuration is to have a place
> to connect qemu virtual hosts as described in BLFS.
>
> -- Bruce
>
>
>
Systemd unit mirrors /etc/rc.d/init.d/network script, not ifup/ifdown
scripts themself. The ifup/ifdown scripts are still the same as in LFS.
The way how/when they are invoked is, however, different.
--
Note: My last name is not Krejzi.
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