pkg/cidata: Enable mDNS in guest using `systemd` #4272

norio-nomura · 2025-11-01T06:45:37Z

This change allows resolving <guest's hostname>.local to guest ip by mDNS on macOS host.

e.g.

$ limactl start --name shared-and-vznat --tty=false --network=lima:shared,vzNAT --containerd=none --log-level error
...
$ dns-sd -q lima-shared-and-vznat.local
DATE: ---Sat 01 Nov 2025---
15:31:14.555  ...STARTING...
Timestamp     A/R  Flags         IF  Name                          Type   Class  Rdata
15:31:14.555  Add  40000003      27  lima-shared-and-vznat.local.  Addr   IN     192.168.64.2
15:31:14.555  Add  40000002      31  lima-shared-and-vznat.local.  Addr   IN     192.168.105.3
^C
$ ping -c 1 lima-shared-and-vznat.local
PING lima-shared-and-vznat.local (192.168.64.2): 56 data bytes
64 bytes from 192.168.64.2: icmp_seq=0 ttl=64 time=0.568 ms

--- lima-shared-and-vznat.local ping statistics ---
1 packets transmitted, 1 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.568/0.568/0.568/0.000 ms

This change allows resolving `<guest's hostname>.local` to guest ip by mDNS on macOS host. e.g. ```console $ limactl start --name shared-and-vznat --tty=false --network=lima:shared,vzNAT --containerd=none --log-level error ... $ dns-sd -q lima-shared-and-vznat.local DATE: ---Sat 01 Nov 2025--- 15:31:14.555 ...STARTING... Timestamp A/R Flags IF Name Type Class Rdata 15:31:14.555 Add 40000003 27 lima-shared-and-vznat.local. Addr IN 192.168.64.2 15:31:14.555 Add 40000002 31 lima-shared-and-vznat.local. Addr IN 192.168.105.3 ^C $ ping -c 1 lima-shared-and-vznat.local PING lima-shared-and-vznat.local (192.168.64.2): 56 data bytes 64 bytes from 192.168.64.2: icmp_seq=0 ttl=64 time=0.568 ms --- lima-shared-and-vznat.local ping statistics --- 1 packets transmitted, 1 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 0.568/0.568/0.568/0.000 ms ``` Signed-off-by: Norio Nomura <norio.nomura@gmail.com>

… is enabled Signed-off-by: Norio Nomura <norio.nomura@gmail.com>

AkihiroSuda · 2025-11-01T09:25:42Z

pkg/cidata/cidata.TEMPLATE.d/boot/06-enable-mdns-on-systemd.sh

Doesn't this work with other drivers with lima:shared ?

It works.

$ limactl start --name bridged --tty=false --network=lima:bridged --containerd=none --log-level=error ... $ ping -c 1 lima-bridged.local PING lima-bridged.local (192.168.12.43): 56 data bytes 64 bytes from 192.168.12.43: icmp_seq=0 ttl=64 time=1.068 ms --- lima-bridged.local ping statistics --- 1 packets transmitted, 1 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 1.068/1.068/1.068/nan ms $ limactl start --name host-only --tty=false --network=lima:host --containerd=none --log-level=error ... $ ping -c 1 lima-host-only.local PING lima-host-only.local (192.168.106.2): 56 data bytes 64 bytes from 192.168.106.2: icmp_seq=0 ttl=64 time=1.090 ms --- lima-host-only.local ping statistics --- 1 packets transmitted, 1 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 1.090/1.090/1.090/nan ms

Does it work with QEMU, krunkit, and other potential drivers too?

Sorry, PR's title was not correct. Fixed.

I'll test with other drivers on macOS.

It works with qemu and krunkit.

$ ping -c 1 lima-qemu.local PING lima-qemu.local (192.168.105.6): 56 data bytes 64 bytes from 192.168.105.6: icmp_seq=0 ttl=64 time=0.748 ms --- lima-qemu.local ping statistics --- 1 packets transmitted, 1 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 0.748/0.748/0.748/0.000 ms $ ping -c 1 lima-krunkit.local PING lima-krunkit.local (192.168.105.5): 56 data bytes 64 bytes from 192.168.105.5: icmp_seq=0 ttl=64 time=1.005 ms --- lima-krunkit.local ping statistics --- 1 packets transmitted, 1 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 1.005/1.005/1.005/nan ms

Is there already a way to limit the execution of the boot script by the host OS?

The script shouldn't care about the host OS. There should be a CIDATA variable that indicates the existence of IP-reachable network.

At first, I tried to enable mDNS on the corresponding interface when Direct IP was detected, not as a boot script.
However, if there is no mDNS environment on the host OS side, I thought it would be meaningless to enable it, so I wanted to limit it to macOS.

Moved 06-enable-mdns-on-systemd.sh from pkg/driver/vz to pkg/cidata.

Signed-off-by: Norio Nomura <norio.nomura@gmail.com>

AkihiroSuda

Thanks

norio-nomura · 2025-11-02T09:09:24Z

Thanks! 🙏🏻

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norio-nomura force-pushed the enable-mDNS-in-guest-using-systemd-on-macOS-host branch from f7797d5 to 4584ef8 Compare November 1, 2025 07:01

06-enable-mdns-on-systemd.sh: Add checking systemd-resolved.service…

ab0d64c

… is enabled Signed-off-by: Norio Nomura <norio.nomura@gmail.com>

AkihiroSuda reviewed Nov 1, 2025

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norio-nomura changed the title ~~pkg/driver/vz: Enable mDNS in guest using systemd on macOS host~~ pkg/driver/vz: Enable mDNS in guest using systemd on VZ Nov 1, 2025

Move 06-enable-mdns-on-systemd.sh from pkg/driver/vz to pkg/cidata

a59ced4

Signed-off-by: Norio Nomura <norio.nomura@gmail.com>

norio-nomura changed the title ~~pkg/driver/vz: Enable mDNS in guest using systemd on VZ~~ pkg/cidata: Enable mDNS in guest using systemd Nov 2, 2025

AkihiroSuda approved these changes Nov 2, 2025

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AkihiroSuda added this to the v2.0.0 milestone Nov 2, 2025

AkihiroSuda added the component/dns label Nov 2, 2025

AkihiroSuda merged commit cc9fca7 into lima-vm:master Nov 2, 2025
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norio-nomura deleted the enable-mDNS-in-guest-using-systemd-on-macOS-host branch November 2, 2025 09:09

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