This bug was fixed in the package klibc - 2.0.4-9ubuntu2
---------------
klibc (2.0.4-9ubuntu2) bionic; urgency=medium
* Write DNS domain in place of DOMAINSEARCH if that wasn't provided by the
DHCP server. (LP: #1713747)
- 0001-Write-DNS-domain-from-DHCP-if-we-have-no-DOMAINSEARC.patch
-- Mathieu Trudel-Lapierre <cypher...@ubuntu.com> Thu, 09 Nov 2017
16:14:08 -0500
** Changed in: klibc (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1713747
Title:
missing DOMAINSEARCH in initramfs output files if the DHCP server
doesn't provide one
Status in isc-dhcp package in Ubuntu:
Fix Released
Status in klibc package in Ubuntu:
Fix Released
Status in isc-dhcp source package in Xenial:
Triaged
Status in klibc source package in Xenial:
Triaged
Status in isc-dhcp source package in Zesty:
Fix Committed
Status in klibc source package in Zesty:
Triaged
Bug description:
[Impact]
Systems booted off the network where the DHCP server provides a domain name
but no search domains may wish to rely on the domain name as a search value (as
is done in isc-dhcp in userland, outside the initramfs), to be able to use
short names for resolving hosts.
[Test cases]
1) Boot a system with a remote root over the network
- Typically this requires adding ip=(some IP settings) or ip=dhcp on the
kernel command-line, and is better done automatically.
One good setup for this is to use MaaS to configure the system; where it will
require a remote root over iSCSI.
2) Break boot in the initramfs (adding 'break=bottom' or 'break=premount' to
stop in the initramfs at its end, or just before it mounts filesystems)
3) Validate the contents of /etc/resolv.conf
[Regression potential]
Potential regressions would include incorrectly resolving names, bad
configuration of /etc/resolv.conf (invalid values for the fields, or missing
fields), or even failure to mount the remote root in the cases where name
resolution is required to find the remote server.
--
For networked systems, for instance booting with an iSCSI root,
dhclient writes an output file in the form of /run/net-<iface>.conf
that contains data for other programs to consume. This allows, for
instance, open-iscsi to get the right information and properly connect
to the server to mount the root filesystem.
It is common for DHCP servers to only provide a domain name value, and
no search domains. In this case, isc-dhcp doesn't currently write
DOMAINSEARCH, but people may wish to use short names to resolve things
(such as in iSCSI server).
In the not-initramfs dhclient-script, when domain_search isn't
provided but domain_name is, domain_name is written to the search
string. If both are provided, domain_search is written. The initramfs
enter hook should do the same.
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