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cloud-init/ci-Prevent-NM-from-handling-DNS-when-network-interfaces.patch
Miroslav Rezanina 5e03c28b99 * Mon Nov 18 2024 Miroslav Rezanina <mrezanin@redhat.com> - 23.4-22 
- ci-Prevent-NM-from-handling-DNS-when-network-interfaces.patch [RHEL-65768]
- Resolves: RHEL-65768
  ([RHEL-9] Prevent NM from handling DNS when network interfaces have DNS config)
2024-11-18 07:47:13 -05:00

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From 59196e4b797d3e6a34e833d0516dfa0cf6afa3ee Mon Sep 17 00:00:00 2001
From: Ani Sinha <anisinha@redhat.com>
Date: Tue, 5 Nov 2024 04:07:36 +0530
Subject: [PATCH] Prevent NM from handling DNS when network interfaces have DNS
config (#5846)
RH-Author: Ani Sinha <anisinha@redhat.com>
RH-MergeRequest: 116: Prevent NM from handling DNS when network interfaces have DNS config (#5846)
RH-Jira: RHEL-65768
RH-Acked-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Commit: [1/1] 247ac2b34d3858a03507d29399f3414a4f4db263 (anisinha/cloud-init)
In the change under PR #5401, we use global DNS configuration as well as
DNS and search domain information from interface config and use it to populate
/etc/resolv.conf. Therefore, if either or both global DNS/search domain config
is present along with per-interface DNS/search domain information, we should add
a network manager configuration to prevent network manager from manipulating
/etc/resolv.conf.
This is in addition to what we already do when only global DNS data is
configured.
Fixes bug added in 1b8030e0 .
Signed-off-by: Ani Sinha <anisinha@redhat.com>
(cherry picked from commit 2df49b652471999434f06d9d83ed9db8b4055895)
---
cloudinit/net/sysconfig.py | 28 +++++--
tests/unittests/test_net.py | 158 ++++++++++++++++++++++++++++++++++++
2 files changed, 181 insertions(+), 5 deletions(-)
diff --git a/cloudinit/net/sysconfig.py b/cloudinit/net/sysconfig.py
index e4a65187..4898a2fd 100644
--- a/cloudinit/net/sysconfig.py
+++ b/cloudinit/net/sysconfig.py
@@ -905,17 +905,35 @@ class Renderer(renderer.Renderer):
@staticmethod
def _render_networkmanager_conf(network_state, templates=None):
+ iface_dns = False
content = networkmanager_conf.NetworkManagerConf("")
-
- # If DNS server information is provided, configure
- # NetworkManager to not manage dns, so that /etc/resolv.conf
- # does not get clobbered.
+ # check if there is interface specific DNS information configured
+ for iface in network_state.iter_interfaces():
+ for subnet in iface["subnets"]:
+ if "dns_nameservers" in subnet or "dns_search" in subnet:
+ iface_dns = True
+ break
+ if (
+ not iface_dns
+ and "dns" in iface
+ and (iface["dns"]["nameservers"] or iface["dns"]["search"])
+ ):
+ iface_dns = True
+ break
+
+ # If DNS server and/or dns search information is provided either
+ # globally or per interface basis, configure NetworkManager to
+ # not manage dns, so that /etc/resolv.conf does not get clobbered.
# This is not required for NetworkManager renderer as it
# does not write /etc/resolv.conf directly. DNS information is
# written to the interface keyfile and NetworkManager is then
# responsible for using the DNS information from the keyfile,
# including managing /etc/resolv.conf.
- if network_state.dns_nameservers:
+ if (
+ network_state.dns_nameservers
+ or network_state.dns_searchdomains
+ or iface_dns
+ ):
content.set_section_keypair("main", "dns", "none")
if len(content) == 0:
diff --git a/tests/unittests/test_net.py b/tests/unittests/test_net.py
index ddb45dc6..47b36d05 100644
--- a/tests/unittests/test_net.py
+++ b/tests/unittests/test_net.py
@@ -967,6 +967,164 @@ dns = none
),
],
},
+ {
+ "in_data": {
+ "networks": [
+ {
+ "network_id": "dacd568d-5be6-4786-91fe-750c374b78b4",
+ "type": "ipv4",
+ "netmask": "255.255.252.0",
+ "link": "eth0",
+ "routes": [
+ {
+ "netmask": "0.0.0.0",
+ "network": "0.0.0.0",
+ "gateway": "172.19.3.254",
+ }
+ ],
+ "ip_address": "172.19.1.34",
+ "dns_search": ["example3.com"],
+ "dns_nameservers": ["172.19.0.12"],
+ "id": "network0",
+ }
+ ],
+ "links": [
+ {
+ "ethernet_mac_address": "fa:16:3e:ed:9a:59",
+ "mtu": None,
+ "type": "physical",
+ "id": "eth0",
+ },
+ ],
+ },
+ "in_macs": {
+ "fa:16:3e:ed:9a:59": "eth0",
+ },
+ "out_sysconfig_opensuse": [
+ (
+ "etc/sysconfig/network/ifcfg-eth0",
+ """
+# Created by cloud-init automatically, do not edit.
+#
+BOOTPROTO=static
+IPADDR=172.19.1.34
+LLADDR=fa:16:3e:ed:9a:59
+NETMASK=255.255.252.0
+STARTMODE=auto
+""".lstrip(),
+ ),
+ (
+ "etc/resolv.conf",
+ """
+; Created by cloud-init automatically, do not edit.
+;
+nameserver 172.19.0.12
+search example3.com
+""".lstrip(),
+ ),
+ (
+ "etc/NetworkManager/conf.d/99-cloud-init.conf",
+ """
+# Created by cloud-init automatically, do not edit.
+#
+[main]
+dns = none
+""".lstrip(),
+ ),
+ (
+ "etc/udev/rules.d/85-persistent-net-cloud-init.rules",
+ "".join(
+ [
+ 'SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ',
+ 'ATTR{address}=="fa:16:3e:ed:9a:59", NAME="eth0"\n',
+ ]
+ ),
+ ),
+ ],
+ "out_sysconfig_rhel": [
+ (
+ "etc/sysconfig/network-scripts/ifcfg-eth0",
+ """
+# Created by cloud-init automatically, do not edit.
+#
+AUTOCONNECT_PRIORITY=120
+BOOTPROTO=none
+DEFROUTE=yes
+DEVICE=eth0
+DNS1=172.19.0.12
+DOMAIN=example3.com
+GATEWAY=172.19.3.254
+HWADDR=fa:16:3e:ed:9a:59
+IPADDR=172.19.1.34
+NETMASK=255.255.252.0
+ONBOOT=yes
+TYPE=Ethernet
+USERCTL=no
+""".lstrip(),
+ ),
+ (
+ "etc/resolv.conf",
+ """
+; Created by cloud-init automatically, do not edit.
+;
+nameserver 172.19.0.12
+search example3.com
+""".lstrip(),
+ ),
+ (
+ "etc/NetworkManager/conf.d/99-cloud-init.conf",
+ """
+# Created by cloud-init automatically, do not edit.
+#
+[main]
+dns = none
+""".lstrip(),
+ ),
+ (
+ "etc/udev/rules.d/70-persistent-net.rules",
+ "".join(
+ [
+ 'SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ',
+ 'ATTR{address}=="fa:16:3e:ed:9a:59", NAME="eth0"\n',
+ ]
+ ),
+ ),
+ ],
+ "expected_network_manager": [
+ (
+ "".join(
+ [
+ "etc/NetworkManager/system-connections",
+ "/cloud-init-eth0.nmconnection",
+ ]
+ ),
+ """
+# Generated by cloud-init. Changes will be lost.
+
+[connection]
+id=cloud-init eth0
+uuid=1dd9a779-d327-56e1-8454-c65e2556c12c
+autoconnect-priority=120
+type=ethernet
+
+[user]
+org.freedesktop.NetworkManager.origin=cloud-init
+
+[ethernet]
+mac-address=FA:16:3E:ED:9A:59
+
+[ipv4]
+method=manual
+may-fail=false
+address1=172.19.1.34/22
+route1=0.0.0.0/0,172.19.3.254
+dns=172.19.0.12;
+dns-search=example3.com;
+
+""".lstrip(),
+ ),
+ ],
+ },
{
"in_data": {
"services": [{"type": "dns", "address": "172.19.0.12"}],
--
2.39.3
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