This bug was fixed in the package isc-dhcp - 4.3.5-3ubuntu2
---------------
isc-dhcp (4.3.5-3ubuntu2) artful; 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 <cypher...@ubuntu.com> Thu, 14 Sep 2017
15:41:06 -0700
** Changed in: isc-dhcp (Ubuntu)
Status: In Progress => 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 isc-dhcp source package in Xenial:
In Progress
Status in isc-dhcp source package in Zesty:
Triaged
Bug description:
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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