[Bug 1945288] [NEW] Search domains missing from resolv.conf stub

[Peter Ludikovsky]

Public bug reported:

System is Mint 20.2, with the relevant packages taken from Ubuntu Focal.

This is the output of `systemd-resolv --status vpn0`:
    Link 7 (vpn0)
          Current Scopes: DNS
    DefaultRoute setting: yes
           LLMNR setting: yes
    MulticastDNS setting: no
      DNSOverTLS setting: no
          DNSSEC setting: no
        DNSSEC supported: no
      Current DNS Server: 10.0.0.53
             DNS Servers: 10.0.0.53
              DNS Domain: example.com
                          example.com.rpz
                          privatelink.blob.core.windows.net
                          node.prd.lan.example.com
                          node.stg.lan.example.com
                          node.dev.lan.example.com

However that last domain is missing from `/etc/resolv.conf` (symlink to `/run/systemd/resolve/stub-resolv.conf`), instead there is a line
    # Too many search domains configured, remaining ones ignored.

According to resolv.conf(5) since glibc 2.26 the number of search
domains should be unlimited, and installed is 2.31-0ubuntu9.3

VPN is PaloAlto GlobalProtect through the OpenConnect plugin on
NetworkManager.

Exact same setup and behaviour for a colleague using Pop!_OS 20.04

--
systemd:
  Installed: 245.4-4ubuntu3.13
  Candidate: 245.4-4ubuntu3.13
  Version table:
 *** 245.4-4ubuntu3.13 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     245.4-4ubuntu3.11 500
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
     245.4-4ubuntu3 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

libc-bin:
  Installed: 2.31-0ubuntu9.3
  Candidate: 2.31-0ubuntu9.3
  Version table:
 *** 2.31-0ubuntu9.3 100
        100 /var/lib/dpkg/status
     2.31-0ubuntu9.2 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
     2.31-0ubuntu9 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: focal

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1945288

Title:
  Search domains missing from resolv.conf stub

Status in systemd package in Ubuntu:
  New

Bug description:
  System is Mint 20.2, with the relevant packages taken from Ubuntu
  Focal.

  This is the output of `systemd-resolv --status vpn0`:
      Link 7 (vpn0)
            Current Scopes: DNS
      DefaultRoute setting: yes
             LLMNR setting: yes
      MulticastDNS setting: no
        DNSOverTLS setting: no
            DNSSEC setting: no
          DNSSEC supported: no
        Current DNS Server: 10.0.0.53
               DNS Servers: 10.0.0.53
                DNS Domain: example.com
                            example.com.rpz
                            privatelink.blob.core.windows.net
                            node.prd.lan.example.com
                            node.stg.lan.example.com
                            node.dev.lan.example.com

  However that last domain is missing from `/etc/resolv.conf` (symlink to `/run/systemd/resolve/stub-resolv.conf`), instead there is a line
      # Too many search domains configured, remaining ones ignored.

  According to resolv.conf(5) since glibc 2.26 the number of search
  domains should be unlimited, and installed is 2.31-0ubuntu9.3

  VPN is PaloAlto GlobalProtect through the OpenConnect plugin on
  NetworkManager.

  Exact same setup and behaviour for a colleague using Pop!_OS 20.04

  --
  systemd:
    Installed: 245.4-4ubuntu3.13
    Candidate: 245.4-4ubuntu3.13
    Version table:
   *** 245.4-4ubuntu3.13 500
          500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       245.4-4ubuntu3.11 500
          500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
       245.4-4ubuntu3 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

  libc-bin:
    Installed: 2.31-0ubuntu9.3
    Candidate: 2.31-0ubuntu9.3
    Version table:
   *** 2.31-0ubuntu9.3 100
          100 /var/lib/dpkg/status
       2.31-0ubuntu9.2 500
          500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
       2.31-0ubuntu9 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1945288/+subscriptions