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cloud-init/SOURCES/ci-feat-sysconfig-Add-DNS-from-interface-config-to-reso.patch

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Import from CS git
2024-08-14 16:18:15 +00:00
From 773501c6d2b52a5623b5fed3c5534d41aa6488fa Mon Sep 17 00:00:00 2001
From: Ani Sinha <anisinha@redhat.com>
Date: Thu, 20 Jun 2024 22:27:03 +0530
Subject: [PATCH] feat(sysconfig): Add DNS from interface config to resolv.conf
(#5401)
RH-Author: xiachen <xiachen@redhat.com>
RH-MergeRequest: 140: feat(sysconfig): Add DNS from interface config to resolv.conf (#5401)
RH-Jira: RHEL-46013
RH-Acked-by: Ani Sinha <anisinha@redhat.com>
RH-Acked-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
RH-Commit: [1/1] b9f492627cdae3bf356f388eb0870241793a7f99
sysconfig renderer currently only uses global dns and search domain
configuration in order to populate /etc/resolv.conf. This means it ignores
interface specific dns configuration completely. This means, when global dns
information is absent and only interface specific dns configuration is present,
/etc/resolv.conf will not have complete dns information. Fix this so that
per interface dns information is also taken into account along with global dns
configuration in order to populate /etc/resolv.conf.
Fixes: GH-5400
Signed-off-by: Ani Sinha <anisinha@redhat.com>
(cherry picked from commit 1b8030e0c7fd6fbff7e38ad1e3e6266ae50c83a5)
---
cloudinit/net/sysconfig.py | 52 +++++++++-
tests/unittests/test_net.py | 183 +++++++++++++++++++++++++++++++++++-
2 files changed, 229 insertions(+), 6 deletions(-)
diff --git a/cloudinit/net/sysconfig.py b/cloudinit/net/sysconfig.py
index f01c4236..42eb2be3 100644
--- a/cloudinit/net/sysconfig.py
+++ b/cloudinit/net/sysconfig.py
@@ -824,20 +824,62 @@ class Renderer(renderer.Renderer):
@staticmethod
def _render_dns(network_state, existing_dns_path=None):
- # skip writing resolv.conf if network_state doesn't include any input.
+
+ found_nameservers = []
+ found_dns_search = []
+
+ for iface in network_state.iter_interfaces():
+ for subnet in iface["subnets"]:
+ # Add subnet-level DNS
+ if "dns_nameservers" in subnet:
+ found_nameservers.extend(subnet["dns_nameservers"])
+ if "dns_search" in subnet:
+ found_dns_search.extend(subnet["dns_search"])
+
+ # Add interface-level DNS
+ if "dns" in iface:
+ found_nameservers += [
+ dns
+ for dns in iface["dns"]["nameservers"]
+ if dns not in found_nameservers
+ ]
+ found_dns_search += [
+ search
+ for search in iface["dns"]["search"]
+ if search not in found_dns_search
+ ]
+
+ # When both global and interface specific entries are present,
+ # use them both to generate /etc/resolv.conf eliminating duplicate
+ # entries. Otherwise use global or interface specific entries whichever
+ # is provided.
+ if network_state.dns_nameservers:
+ found_nameservers += [
+ nameserver
+ for nameserver in network_state.dns_nameservers
+ if nameserver not in found_nameservers
+ ]
+ if network_state.dns_searchdomains:
+ found_dns_search += [
+ search
+ for search in network_state.dns_searchdomains
+ if search not in found_dns_search
+ ]
+
+ # skip writing resolv.conf if no dns information is provided in conf.
if not any(
[
- len(network_state.dns_nameservers),
- len(network_state.dns_searchdomains),
+ len(found_nameservers),
+ len(found_dns_search),
]
):
return None
content = resolv_conf.ResolvConf("")
if existing_dns_path and os.path.isfile(existing_dns_path):
content = resolv_conf.ResolvConf(util.load_file(existing_dns_path))
- for nameserver in network_state.dns_nameservers:
+ for nameserver in found_nameservers:
content.add_nameserver(nameserver)
- for searchdomain in network_state.dns_searchdomains:
+ for searchdomain in found_dns_search:
content.add_search_domain(searchdomain)
header = _make_header(";")
content_str = str(content)
diff --git a/tests/unittests/test_net.py b/tests/unittests/test_net.py
index e010eb6b..86ba398d 100644
--- a/tests/unittests/test_net.py
+++ b/tests/unittests/test_net.py
@@ -516,6 +516,8 @@ OS_SAMPLES = [
}
],
"ip_address": "172.19.1.34",
+ "dns_search": ["testweb.com"],
+ "dns_nameservers": ["172.19.0.13"],
"id": "network0",
}
],
@@ -550,7 +552,9 @@ STARTMODE=auto
"""
; Created by cloud-init automatically, do not edit.
;
+nameserver 172.19.0.13
nameserver 172.19.0.12
+search testweb.com
""".lstrip(),
),
(
@@ -581,6 +585,8 @@ dns = none
BOOTPROTO=none
DEFROUTE=yes
DEVICE=eth0
+DNS1=172.19.0.13
+DOMAIN=testweb.com
GATEWAY=172.19.3.254
HWADDR=fa:16:3e:ed:9a:59
IPADDR=172.19.1.34
@@ -595,7 +601,173 @@ USERCTL=no
"""
; Created by cloud-init automatically, do not edit.
;
+nameserver 172.19.0.13
nameserver 172.19.0.12
+search testweb.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=172.19.0.13;
+dns-search=testweb.com;
+
+""".lstrip(),
+ ),
+ ],
+ },
+ {
+ "in_data": {
+ "services": [
+ {
+ "type": "dns",
+ "address": "172.19.0.12",
+ "search": ["example1.com", "example2.com"],
+ }
+ ],
+ "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 example1.com example2.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.
+#
+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 example1.com example2.com
""".lstrip(),
),
(
@@ -646,6 +818,7 @@ 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(),
),
@@ -653,7 +826,13 @@ dns=172.19.0.12;
},
{
"in_data": {
- "services": [{"type": "dns", "address": "172.19.0.12"}],
+ "services": [
+ {
+ "type": "dns",
+ "address": "172.19.0.12",
+ "search": "example.com",
+ }
+ ],
"networks": [
{
"network_id": "public-ipv4",
@@ -714,6 +893,7 @@ STARTMODE=auto
; Created by cloud-init automatically, do not edit.
;
nameserver 172.19.0.12
+search example.com
""".lstrip(),
),
(
@@ -761,6 +941,7 @@ USERCTL=no
; Created by cloud-init automatically, do not edit.
;
nameserver 172.19.0.12
+search example.com
""".lstrip(),
),
(
--
2.45.1
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