Public bug reported:
Running dhclient in a (non-root) network namespace on a system with
systemd enabled fails because the hook installed by the systemd package
updates the DNS configuration of the core/root namespace, instead of
simply the /etc/resolv.conf file of that particular network namespace.
("ip netns add <name>" nicely links /etc/resolv.conf in that namespace
to /etc/netns/<name>/resolv.conf if it exists.)
The following patch ensures that this script no longer misbehaves for
this scenario:
--- /etc/dhcp/dhclient-enter-hooks.d/resolved.bak 2020-07-21
14:05:23.390989468 +0200
+++ /etc/dhcp/dhclient-enter-hooks.d/resolved 2020-07-21 14:03:18.566046842
+0200
@@ -14,7 +14,7 @@
# (D) = master script downs interface
# (-) = master script does nothing with this
-if [ -x /lib/systemd/systemd-resolved ] ; then
+if [ -x /lib/systemd/systemd-resolved ] && [ -z "$(ip netns identify)" ] ; then
# For safety, first undefine the nasty default make_resolv_conf()
make_resolv_conf() { : ; }
case "$reason" in
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: dhclient network-namespace systemd
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https://bugs.launchpad.net/bugs/1888391
Title:
/etc/dhcp/dhclient-enter-hooks.d/resolved should not run in non-root
network namespaces
Status in systemd package in Ubuntu:
New
Bug description:
Running dhclient in a (non-root) network namespace on a system with
systemd enabled fails because the hook installed by the systemd
package updates the DNS configuration of the core/root namespace,
instead of simply the /etc/resolv.conf file of that particular network
namespace.
("ip netns add <name>" nicely links /etc/resolv.conf in that namespace
to /etc/netns/<name>/resolv.conf if it exists.)
The following patch ensures that this script no longer misbehaves for
this scenario:
--- /etc/dhcp/dhclient-enter-hooks.d/resolved.bak 2020-07-21
14:05:23.390989468 +0200
+++ /etc/dhcp/dhclient-enter-hooks.d/resolved 2020-07-21 14:03:18.566046842
+0200
@@ -14,7 +14,7 @@
# (D) = master script downs interface
# (-) = master script does nothing with this
-if [ -x /lib/systemd/systemd-resolved ] ; then
+if [ -x /lib/systemd/systemd-resolved ] && [ -z "$(ip netns identify)" ] ;
then
# For safety, first undefine the nasty default make_resolv_conf()
make_resolv_conf() { : ; }
case "$reason" in
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