Re: [Qemu-discuss] OSX options for DHCP address for Yocto VM

[Nathan Sowatskey]

Thank you very much :-)

I used:

-redir tcp:5555::22

And was able to:

<OSX host>$ ssh -p 5555 address@hidden
Last login: Thu Jan 28 17:13:49 2016 from 10.0.2.2
address@hidden:~# 

In full, the options are:

/usr/local/bin/qemu-system-x86_64 -kernel images/bzImage-qemux86-64.bin -usb 
-redir tcp:5555::22 -drive 
file=images/core-image-full-cmdline-qemux86-64.ext4,if=virtio,format=raw 
-show-cursor -no-reboot -m 256 -serial mon:vc -serial null --append "vga=0 
uvesafb.mode_option=640x480-32 root=/dev/vda rw mem=256M oprofile.timer=1 
rootfstype=ext4 “

I also noted that there should be a means to use a qemu-bridge-helper which 
would, it is said, automate a bridged connection. But the qemu-bridge-helper 
does not seem to be present with the Homebrew install of qemu on OSX. I may 
have to figure that out later.

Regards

Nathan

> On 28 Jan 2016, at 18:01, Peter Maydell <address@hidden> wrote:
> 
> On 28 January 2016 at 16:35, Nathan Sowatskey <address@hidden> wrote:
>> What I would like is to have a DHCP assigned address for the VM so that I 
>> can reach it from the host. I have tried the startup options below:
>> 
>> /usr/local/bin/qemu-system-x86_64 -kernel images/bzImage-qemux86-64.bin -usb 
>> -netdev user,id=user.0 -device usb-net,netdev=user.0 -drive 
>> file=images/core-image-full-cmdline-qemux86-64.ext4,if=virtio,format=raw 
>> -show-cursor -no-reboot -m 256 -serial mon:vc -serial null --append "vga=0 
>> uvesafb.mode_option=640x480-32 root=/dev/vda rw mem=256M oprofile.timer=1 
>> rootfstype=ext4 “
>> 
>> The options above, which I understood to equivalent to not specifying 
>> anything at all for netdev, do not give me a configured eth0. So, not what I 
>> need it seems.
> 
> The default network card for qemu-system-x86_64's PC model is not usb-net
> (it's e1000), which is probably why you see this difference.
> 
>> And, with no netted options at all:
> 
>> The options above do give me a configured eth0, with an address
>> taken from the Qemu DHCP address pool. That address, of 10.0.2.15
>> as it happens, is not reachable from the OSX host though. So, close,
>> but no cookie yet.
> 
> This is expected for usermode networking.
> 
>> Can anyone help me wth closing the gap so I can reach the VM from
>> the OSX host please?
> 
> If you just need access to one or two ports (eg ssh) it may be
> simplest just to use the user-mode networking's hostfwd option,
> which will cause QEMU to forward connections from your host's
> port X to guest port Y.
> 
> Otherwise you need to use a backend other than 'user'. This means
> 'tap', but this is largely tested and intended for a Linux host,
> so you will have to do some googling to try to find out how to
> set up tun/tap on OSX hosts and it might not work. (Even tun/tap
> on Linux hosts requires a bit of setup.)
> 
> QEMU networking docs:
> http://wiki.qemu.org/Documentation/Networking
> 
> thanks
> -- PMM
>