04-04-2013
Adding a network interface to a bonded interface
I have a RHEL 5 system with a bonded interface configure using only one network port (eth0). So I have config file for ifcfg-bond0 and ifcfg-eth[0-5]. I'd like to configure eth5 to be the second SLAVE in the bond. My question is, after I modify ifcfg-eth5, can I add eth5 to the bond0 interface without disrupting network connectivity by simply doing:
I'm trying to avoid restarting the network service because I don't want to interrupt connectivity.
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LEARN ABOUT SUSE
ifservices
IFSERVICES(5) Network configuration IFSERVICES(5)
NAME
ifservices-* - control network services with ifup/down
SYNOPSIS
/etc/sysconfig/network/ifservices-<configuration_name>/
DESCRIPTION
The directory /etc/sysconfig/network/ifservices-<configuration_name>/ is read by the script /etc/sysconfig/network/scripts/ifup-services
which starts and stops system services when an interface is set up/down. ifup-services is used by /sbin/ifup, which is the command line
user interface for setting up network interfaces.
This is useful if you don't have a permanent network connection. If you sometimes boot without network and plug in the network cable later
you can add links to system services in this directory. These services will then be started with ifup and stopped with ifdown.
The configuration name used for ifservices-* should match exactly the configuration name of the ifcfg-* file for the interface.
For the usage with NetworkManager (where you don't necessarily need a ifcfg-* file) you can also use /etc/sysconfig/network/ifser-
vices-<interface>-<essid>/ (for wlan interfaces) or if that does not exist /etc/sysconfig/network/ifservices-<interface>/. As a final
fallback /etc/sysconfig/network/ifservices/ is checked as well. If NetworkManager is active services will be stopped after the interface is
down.
The links in this directory are equal to the links in the runlevel directories /etc/init.d/rc*.d/ They have to point to service start
scripts which are usually in /etc/init.d/. Links starting with 'S' are start links, which are called in alphabetical order after ifup has
set up the interface. Links starting with 'K' are kill links which are called before ifdown takes down the interface. See also section
Sequencing Directories in boot (7).
EXAMPLE
In this example we use an interface with MAC address 00:de:ad:be:af:00. This interface is not always physically connected. As soon as you
plug in the cable ypbind and autofs should be started. When you pull the cable they should be stopped. This can be reached with:
in file /etc/sysconfig/network/ifcfg-eth-id-00:de:ad:be:af:00
...
STARTMODE=ifplugd
...
in dir /etc/sysconfig/network/ifservices-eth-id-00:de:ad:be:af:00/
S10portmap -> /etc/init.d/portmap
S20ypbind -> /etc/init.d/ypbind
S30autofs -> /etc/init.d/autofs
S20autofs -> /etc/init.d/autofs
K30ypbind -> /etc/init.d/ypbind
Now you have to disable the start of this services at boot time
chkconfig ypbind off
chkconfig autofs off
Notes:
You may call scripts/create-ifservices-directory [<interface_name>] to create a directory with the links from this example. This will cre-
ate the directory ifservices-<interface_name> or if no interface name was given ifservices-template.
Maybe you have to add also variable IFPLUGD_PRIORITY. For details about startmode ifplugd read ifup (8).
The service portmap had to be added because ypbind needs it. This service is still started at boot time because it does not need an active
network connection. But ypbind may now be started earlier as usual. Therefore we make sure that portmap is started before. Starting an
already running service again does not affect the service.
SEE ALSO
ifup(8), ifcfg(5).
AUTHOR
Christian Zoz <zoz@suse.de>
sysconfig February 2005 IFSERVICES(5)