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Introduction

The workflow of the installation is customized via the control file, and below we have the principal steps concerning network configuration:

  1. Linuxrc
  2. inst_dhcp
  3. inst_lan
  4. manual_configuration - SLE (in registration, addons or disks activation) - openSUSE (only in addons or disks activation)
  5. finish - network_finish -> save_network

Note: If you are interested in knowing more about the installation process check this documentation.

Linuxrc

As the documentation of the project explains, it is the very early part of the SuSE Installation before YaST runs which means that it is the first one responsible for the network config.

We can pass many options to the installation process that will be parsed by linuxrc configuring our interfaces according to that options, or forwarding the given information through the install.inf file.

By default linuxrc does not configure any interface except in the case that we specify some special options as for example enabling vnc, ssh or with the ifcfg option ifcfg=*=dhcp. If any of these options is given, linuxrc will create a ifcfg file per interface with these options:

BOOTPROTO='dhcp'
STARTMODE='auto'

Or a static config if it is specified so by ifcfg option, for example:

ifcfg=eth0=192.168.122.100/24,192.168.122.1,192.168,122.1,suse.de

Will create ifcfg-eth0 with:

BOOTPROTO='static'
STARTMODE='auto'
IPADDR='192.168.122.100/24'

ifroute-eth0:

default 192.168.122.1 - eth0

network/config:

NETCONFIG_DNS_STATIC_SEARCH_LIST="suse.de"
NETCONFIG_DNS_STATIC_SERVERS="192.168.122.1"

and network/dhcp

DHCLIENT_SET_HOSTNAME="yes"

Note: We can use sethostname=0 to disable this option, and also we can provide a static hostname with hostname=whatever.example.com

inst_dhcp

This client will try to configure dhcp in all the connected cards that have not been configured yet but only in the case that linuxrc has not activated one previously (i.e. with some parameter that implies a remote connection).

inst_lan

In case that the network was not configured then the lan client will be launched after the welcome dialog as you can see here otherwise the client will be skipped.

Manual Configuration (lan client)

In some scenarios, special network configuration is needed, i.e:

  • Network storage environment
  • Need of a particular vlan
  • Addons media not available for the configured network.
  • Wrong configuration

For these reasons, there are some places during the installation that allow us to launch the network configuration client.

  • disks_activate
  • registration (only in SLE)
  • addons

inst_finish

This step is when the configuration is really copied from the running system to the installed one. This client calls more specialized clients to procceed with the configuration, in case of networking it will call network_finish which will call save_network.