Network enablement and configuration
- Network enablement for installer - configure and activate one device to be used during installation. It can be configured using boot parameters, or kickstart, or if needed user can be prompted to enable network in loader UI (when fetching kickstart or updates image over network), or in text mode UI and GUI (when setting up network storage (iscsi, fcoe) or network repository). Additional devices can be activated only in GUI, using NetworkManager Connection Editor (nm-c-e) by checking Connect Automatically
- There is a bug requiring an option of activation of additional devices in kickstart.
- Once the device is activated, it can't be reactivated with changed configuration (e.g. static configuration with fixed nameserver, see bug 504983). I want to offer this possibility in GUI which requires option to activate/disconnect a device on demand (see device activation).
- Target system network configuration. Can be done with kickstart or in GUI using nm-c-e. Undesirably, checking Connect Automatically will activate the device after the configuration is applied (see ONBOOT side-effect). We are not aware of any problems caused by this side effect which is invisible to the user (Anaconda doesn't wait for NetworkManager activating the device), but I can imagine there might be some lurking.
As you can see, configuration of installer environment and target system is not well separated. It is because in GUI we use nm-c-e for enablement, and we have to use same configuration files for installer and target system configuration.
On Live CD, network is configured in Live CD environment using NetworkManager Applet on panel.
Modes of configuration
These anaconda boot options can be used to enable network in loader (e.g. for getting kickstart, updates image, or for network installation): asknetwork, dhcpclass, dhcptimeout, dns, essid, ethtool, gateway, ip, ipv6, ksdevice, linksleep, mtu, netmask, nicdelay, noipv4, noipv6, wepkey
Kickstart network command can be used both to enable and configure devices. If a device should be enabled in loader (e.g. for getting updates image, or for network installation), first network command will be used to select and configure the device. Other network commands configure devices for target system. This bug should allow activation of these devices at the beginning of stage 2 (post loader) using --activate option.
loader text UI
Serves for selection and configuration of a network device that will be enabled in loader (which happens if kickstart or updates image should be fetched from network or in case of network installation). It will not be run if the information is provided via boot options or Anaconda/Network#kickstart unless required by boot option asknetwork. Configuration options of this UI are a subset of nm-c-e which is used in GUI.
Once the device is successfully activated, there is no possibility to change its configuration in loader UI (see bug 504983).
TODO explain ipv6 options
TODO ipv4 succ and ipv6 fail
text mode UI
editing configuration files
Anaconda communictes with NetworkManager mostly with
ifcfg files (nm-c-e stores its configuration there too). It can be handy to edit them directly for debugging or as workaround solution. Files can be edited using shell in virtual terminal
tty2 ([Ctrl][Alt][F2]). Their location is
/etc/sysconfig/netwrok-scripts/ifcfg-<device name>. The configuration will be applied in installer after the device is disconnected and reactivated. The device is disconnected if its
ifcfg file is removed. It will be activated if an
ifcfg file will be copied back to its location with
ONBOOT=yes set. So configuration of active device for installer environment can be changed this way:
mv /etc/sysconfig/network-scripts/ifcfg-eth0 /tmp vi /tmp/ifcfg-eth0 mv /tmp/ifcfg-eth0 /etc/sysconfig/network-scripts
At the end of the installation,
ifcfg files are copied to target system tree to directory
Bugs and issues
- bug 638181 Here is a patch adding kickstart network --activate option: anaconda partpykickstart part - this doesn't work, we need to activate the device already in loader, so I am going to add --donotactivate option instead, and patch loader. Also network --bootproto ibft should be added. Now we read settings from firmware in anaconda, but NM should do it, us only writing
ifcfg(see bug 479824 which seems to be fixed in Fedora, I have to check).
- Configuration of successfully activated device in installer environment can't be changed. There is no way to disconnect the device and activate it so that changed configuration could be applied (except for workaround by editing configuration files). In desktop, this id done with NetworkManager Applet which offers also selection of access points for wireless connection. I proposed two solutions for GUI on anaconda-devel-list:
Related bug: 504983
- TODO ipv6 fail + ipv4 success
- TODO stateless dhcp6
- TODO onboot -> activate
- TODO network storage - iSCSI (a bug)
- TODO default of network --device (update documentation)
- TODO documentation update