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This bug was fixed in the package isc-dhcp - 4.3.5-3ubuntu1.1
---------------
isc-dhcp (4.3.5-3ubuntu1.1) zesty; urgency=medium
* debian/initramfs-tools/lib/etc/dhcp/dhclient-enter-hooks.d/config: fix the
logic for handling search domains to also write it to the output file when
only the domain name is provided by the DHCP server. Copied code from
debian/dhclient-script.linux. (LP: #1713747)
-- Mathieu Trudel-Lapierre <cyphermox@xxxxxxxxxx> Tue, 29 Aug 2017
11:05:01 -0400
** Changed in: isc-dhcp (Ubuntu Zesty)
Status: Fix Committed => 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:
Fix Released
Status in isc-dhcp source package in Zesty:
Fix Released
Status in klibc source package in Zesty:
Fix Released
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 and /run/net-*.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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