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linuxrc_hostname.md

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hostname setting in installation/rescue system

The hostname can be set (in order of precedence):

  1. via hostname boot option
  2. via DHCP (either from HOSTNAME or FQDN)
  3. Default hostname

linuxrc doesn't write to /etc/hostname, but sets the transient hostname and writes other settings before Yast starts. After that, Yast takes over. See https://github.com/yast/yast-network/blob/master/doc/hostname.md

installation system

  • etc/hostname is an empty file at the beginning of the installation
  • linuxrc doesn't write anything to /etc/hostname
  • linuxrc writes by default /etc/install.inf::SetHostname=1

If ifcfg=*=dhcp is used

  • linuxrc writes /etc/sysconfig/network/dhcp::DHCLIENT_SET_HOSTNAME="yes"

If hostname boot option is used

  1. linuxrc writes /etc/install.inf::SetHostnameUsed=1
  2. linuxrc takes the value of hostname boot option and
    • writes it to /etc/install.inf::Hostname
    • sets the transient hostname to that value

Example

If hostname=myhost is used

/etc/install.inf

[...]
SetHostname: 1
SetHostnameUsed: 1
Hostname: myhost
[...]

If hostname boot option is not used

  1. linuxrc doesn't write /etc/install.inf::Hostname, so it is not present.
  2. linuxrc writes /etc/install.inf::SetHostnameUsed=0.
  3. linuxrc sets the transient hostname to install.

Example

/etc/install.inf

[...]
SetHostname: 1
SetHostnameUsed: 0
[...]

rescue system

linuxrc changes the hostname to rescue, which may be overridden by user hostname boot option.

This value is put into /etc/hostname of the rescue system. The value there may later be overridden by DHCP.