From 0dfe06ba4642fbf64c04b6a4e11400a94eb27a9f Mon Sep 17 00:00:00 2001 From: Major Hayden Date: Tue, 9 May 2023 16:27:36 -0500 Subject: [PATCH] resolv_conf: Allow > 3 nameservers (#2152) Systems running systemd-resolved or dnsmasq can utlize more than three namervers. Older systems will just use the first three and ignore the rest. Signed-off-by: Major Hayden --- cloudinit/distros/parsers/resolv_conf.py | 8 -------- tests/unittests/distros/test_resolv.py | 12 +++++++++--- tools/.github-cla-signers | 1 + 3 files changed, 10 insertions(+), 11 deletions(-) diff --git a/cloudinit/distros/parsers/resolv_conf.py b/cloudinit/distros/parsers/resolv_conf.py index d31ffeb114..0d8dc83f5f 100644 --- a/cloudinit/distros/parsers/resolv_conf.py +++ b/cloudinit/distros/parsers/resolv_conf.py @@ -87,14 +87,6 @@ def add_nameserver(self, ns): new_ns = util.uniq_list(new_ns) if len(new_ns) == len(current_ns): return current_ns - if len(current_ns) >= 3: - LOG.warning( - "ignoring nameserver %r: adding would " - "exceed the maximum of " - "'3' name servers (see resolv.conf(5))", - ns, - ) - return current_ns[:3] self._remove_option("nameserver") for n in new_ns: self._contents.append(("option", ["nameserver", n, ""])) diff --git a/tests/unittests/distros/test_resolv.py b/tests/unittests/distros/test_resolv.py index 65e7810116..363fd31db3 100644 --- a/tests/unittests/distros/test_resolv.py +++ b/tests/unittests/distros/test_resolv.py @@ -30,16 +30,22 @@ def test_local_domain(self): def test_nameservers(self): rp = resolv_conf.ResolvConf(BASE_RESOLVE) + + # Start with two nameservers that already appear in the configuration. self.assertIn("10.15.44.14", rp.nameservers) self.assertIn("10.15.30.92", rp.nameservers) + + # Add a third nameserver and verify it appears in the resolv.conf. rp.add_nameserver("10.2") self.assertIn("10.2", rp.nameservers) self.assertIn("nameserver 10.2", str(rp)) - self.assertNotIn("10.3", rp.nameservers) self.assertEqual(len(rp.nameservers), 3) - rp.add_nameserver("10.2") + + # Add a fourth nameserver and verify it appears in the resolv.conf. rp.add_nameserver("10.3") - self.assertNotIn("10.3", rp.nameservers) + self.assertIn("10.3", rp.nameservers) + self.assertIn("nameserver 10.3", str(rp)) + self.assertEqual(len(rp.nameservers), 4) def test_search_domains(self): rp = resolv_conf.ResolvConf(BASE_RESOLVE) diff --git a/tools/.github-cla-signers b/tools/.github-cla-signers index 7615f0fbf4..a3d692b634 100644 --- a/tools/.github-cla-signers +++ b/tools/.github-cla-signers @@ -82,6 +82,7 @@ lucasmoura lucendio lungj magnetikonline +major mal mamercad ManassehZhou