Unit in network namespace uses default namespace resolv.conf instead of the bind mount /etc/netns/<namespace>/resolv.conf

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Hello, can someone please help me fix this: https://github.com/systemd/systemd/issues/28694

The transmission-daemon that is started via systemd in a dedicated network namespace <vpn> is seeing the main namespace resolv.conf instead of the one mounted by netns. If I manually pop into the vpn namespace, the /etc/resolv.conf is correctly identified as the same in /etc/netns/vpn/resolv.conf.

This used to work before 254. I tried to set PrivateMounts=false also for the transmission drop-in, but it doesn't work. Transmission is still querying the main namespace DNS instead of the specific one for the <vpn> netns.

What am I missing?

Cheers

::::::::::::::::: Archlinux Transmission Unit ::::::::::::::::::
[Unit]                                                                                                                │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
Description=Transmission BitTorrent Daemon                                                                            │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org
Wants=network-online.target                                                                                           │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
After=network-online.target                                                                                           │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org
                                                                                                                      │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
[Service]                                                                                                             │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: explodie.org
User=transmission                                                                                                     │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
Type=notify                                                                                                           │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org
ExecStart=/usr/bin/transmission-daemon -f --log-level=error                                                           │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
ExecReload=/bin/kill -s HUP $MAINPID                                                                                  │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org
NoNewPrivileges=true                                                                                                  │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
MemoryDenyWriteExecute=true                                                                                           │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org
ProtectSystem=true                                                                                                    │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
PrivateTmp=true                                                                                                       │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org
                                                                                                                      │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
[Install]                                                                                                             │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org
WantedBy=multi-user.target
::::::::::::::::: Drop in ::::::::::::::::::::::
[Unit]                                                                                                                │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
After=vpn.service                                                                                                     │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org
BindsTo=vpn.service                                                                                                   │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
                                                                                                                      │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org
[Service]                                                                                                             │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
NetworkNamespacePath=/run/netns/vpn                                                                                   │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org
Environment="TR_CURL_VERBOSE=1"                                                                                       │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection
ExecStart=                                                                                                            │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org
ExecStart=/usr/bin/transmission-daemon -f --log-level=debug  

:::::::::::::::: vpn.service ::::::::::::::::::::
[Unit] │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org Description=Start Wireguard VPN with a random peer │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection Wants=network-online.target nss-lookup.target │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org Requires=wireguard.service │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection After=network-online.target nss-lookup.target wireguard.service │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org PartOf=wireguard.service netns@vpn.service │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection JoinsNamespaceOf=netns@vpn.service │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: explodie.org │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection [Service] │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org Type=oneshot │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection RemainAfterExit=true │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection ExecStartPre=-/usr/bin/env ip -n vpn addr flush dev wg0 │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org ExecStartPre=-/usr/bin/env ip -n vpn link set down wg0 │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection ExecStartPre=-/usr/bin/env ip netns exec vpn /usr/local/bin/teardown_wg │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection # Set wg │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org ExecStart=/usr/bin/env ip netns exec vpn /usr/local/bin/setup_wg │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org # Set interface up │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection ExecStart=/usr/bin/env ip -n vpn link set up dev wg0 │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection # Set default route │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org ExecStart=/usr/bin/env ip -n vpn route add default dev wg0 │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org [Install] │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection WantedBy=multi-user.target │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org WantedBy=network-online.target
::::::::::::::::::: wireguard.service :::::::::::::::::
[Unit] │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org Description=Wireguard interface in a dedicated namespace │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection Requires=netns@vpn.service │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org Wants=network-online.target nss-lookup.target │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection After=network-online.target nss-lookup.target netns@vpn.service │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org PartOf=netns@vpn.service │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection JoinsNamespaceOf=netns@vpn.service │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: explodie.org │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection [Service] │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org Type=oneshot │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection RemainAfterExit=true │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection ExecStartPre=-/usr/bin/env ip -n vpn link delete wg0 │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection # Create wg0 interface in normal namespace │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org ExecStart=/usr/bin/env ip link add dev wg0 type wireguard │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org # Move wg0 interface to the vpn namespace │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection ExecStart=/usr/bin/env ip link set wg0 netns vpn │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection # Stop process │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org ExecStop=/usr/bin/env ip -n vpn link delete wg0 │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org [Install] │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection WantedBy=multi-user.target │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org WantedBy=network-online.target
:::::::::::::::::: netns@.service :::::::::::::::::::::
[Unit] │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org Description=%I Namespace wrapper │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection After=network-online.target nss-lookup.target │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org Wants=network-online.target nss-lookup.target │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org [Service] │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection Type=oneshot │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: explodie.org RemainAfterExit=true │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection PrivateNetwork=true │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org PrivateMounts=false │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org ExecStartPre=-/usr/bin/env ip netns delete %i │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org # Add vpn dedicated namespace │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection ExecStart=/usr/bin/env ip netns add %i │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection # Pause │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org ExecStart=/usr/bin/env echo %i │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org # Set loopback device up │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection ExecStart=/usr/bin/env ip -n %i link set dev lo up │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection # Stop process │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org ExecStop=/usr/bin/env ip netns delete %i │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org [Install] │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Closing connection WantedBy=multi-user.target │Aug 05 21:28:11 gagazet transmission-daemon[226124]: * Could not resolve host: tracker.tleechreload.org WantedBy=network-online.target

--

rdb


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