Help with Qemu

[Aijaz Baig]

Hello folks

I'm trying to set up a qemu-kvm VM following this guide as a reference. The only change I did was install DHCP and git as additional target packages while configuring buildroot.

This is how I invoke qemu:

    sudo modprobe kvm-intel && sudo qemu-system-x86_64 -kernel /arch/x86_64/boot/bzImage -nographic -drive format=raw,file=~/buildroot/output/images/rootfs.ext4,if=virtio -append "root=/dev/vda console=ttyS0 nokaslr" -m 512M -accel kvm -cpu host -smp 1 -netdev user,id=nd0,hostfwd=tcp::8080-:80 -device virtio-net,netdev=nd0 -s

After my VM is up and running I modify my /etc/network/interfaces/ file to add the following lines:

    auto eth0
    iface eth0 inet dhcp

Now, with these two changes, I see that my VM interfaces look like this

    # ifconfig
    eth0      Link encap:Ethernet  HWaddr 52:54:00:12:34:56
              inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
              inet6 addr: fe80::fd5a:482c:3194:fa26/64 Scope:Link
              inet6 addr: fec0::28e6:7439:6d58:6246/64 Scope:Site
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:29 errors:0 dropped:0 overruns:0 frame:0
              TX packets:58 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:4401 (4.2 KiB)  TX bytes:6537 (6.3 KiB)
   
    lo        Link encap:Local Loopback
              inet addr:127.0.0.1  Mask:255.0.0.0
              inet6 addr: ::1/128 Scope:Host
              UP LOOPBACK RUNNING  MTU:65536  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

I have a few questions about this setup:

 1. I'd like to know if there is a way to connect to this VM without hostfwd (since it doesn't seem to work)?
 2. My SSH keys get erased on every reboot. Is there a way to persist it?
 3. Speaking of persistence, why is it that my settings in `/etc/network/interfaces` persists while my SSH keys don't?

Keen to have some clarity on this rather user-hostile qemu CLI tool. I find the Qemu documentation to be rather obtuse and seems to be written for folks who have had their feet wet elsewhere already!

--

Best Regards,

Aijaz Baig

[Anil Kumar Pugalia]

1. You need to have some IP of the VM exposed out for connectivity.

2 & 3. Check for how the two locations are mounted.

Regards
Anil

Passion: https://sysplay.in (Playing with Systems)

Aijaz Baig wrote on 13/04/23 12:46 pm:

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