Public bug reported:
Ubuntu 17.04
systemd 232-21ubuntu5
Adding a domain to the search list in /etc/resolv.conf breaks resolving
for that domain. Not only does the search list not get used as expected,
but host names in the domain cannot be resolved by systemd-resolved at
all.
I just ran into this after upgrading from ubuntu 16.04 to 17.04 which
enabled systemd-resolved. I have for a long time used resolveconf to add
a 'search my-domain'-line to my /etc/resolv.conf.
Example of expected behaviour. With Googles DNS server (8.8.8.8) and ubuntu.com
in the search list in /etc/resolv.conf. Both dig and systemd-resolve can
resolve www.ubuntu.com and www:
$ cat /etc/resolv.conf
nameserver 8.8.8.8
search ubuntu.com
$ dig +nostat +nocmd www.ubuntu.com
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55037
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;www.ubuntu.com. IN A
;; ANSWER SECTION:
www.ubuntu.com. 501 IN A 91.189.89.115
$ dig +search +nostat +nocmd www
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25772
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;www.ubuntu.com. IN A
;; ANSWER SECTION:
www.ubuntu.com. 382 IN A 91.189.89.103
$ systemd-resolve www.ubuntu.com
www.ubuntu.com: 91.189.89.115
-- Information acquired via protocol DNS in 2.7ms.
-- Data is authenticated: no
$ systemd-resolve www
www: 91.189.90.59
(www.ubuntu.com)
-- Information acquired via protocol DNS in 3.8ms.
-- Data is authenticated: no
Ubuntu 17.04 default config, with the systemd-resolved name server in
/etc/resolv.conf and no search list. www.ubuntu.com can still be
resolved correctly:
$ cat /etc/resolv.conf
nameserver 127.0.0.53
$ dig +nostat +nocmd www.ubuntu.com
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64646
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;www.ubuntu.com. IN A
;; ANSWER SECTION:
www.ubuntu.com. 482 IN A 91.189.89.110
$ systemd-resolve www.ubuntu.com
www.ubuntu.com: 91.189.90.58
-- Information acquired via protocol DNS in 18.2ms.
-- Data is authenticated: no
Broken behaviour, using the systemd-resolved name server and specify
ubuntu.com in search list. Resolving fails for www.ubuntu.com and www,
both using dig (DNS) and using sytemd-resolve:
$ cat /etc/resolv.conf
nameserver 127.0.0.53
search ubuntu.com
$ dig +nostat +nocmd www.ubuntu.com
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 33334
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;www.ubuntu.com. IN A
$ dig +search +nostat +nocmd www
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 50588
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;www.ubuntu.com. IN A
$ systemd-resolve www.ubuntu.com
www.ubuntu.com: resolve call failed: No appropriate name servers or
networks for name found
$ systemd-resolve www
www: resolve call failed: All attempts to contact name servers or networks
failed
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1714803
Title:
Search list in resolv.conf breaks resolving for that domain
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