Re: [Qemu-devel] dns server not working in QEMU using usermode networking (SLIRP)

[Samuel Thibault]

FONNEMANN Mark, on sam. 06 mai 2017 04:18:52 +0000, wrote:
> >That's so weird there's no packet log. Does your guest perhaps have the 
> >strace tool? Or perhaps you >can manage to copy it over from another VM, 
> >since it only depends on libc.
> 
> See attached file.

Ok, so for some reason it doesn't even try to emit a packet...

> open("/etc/resolv.conf", O_RDONLY)      = 3
> read(3, "nameserver 10.0.2.3\n\n", 4096) = 21

It does get the proper nameserver.

> connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT 
> (No such file or directory)

It tries to connect to nscd but that's not running.

> open("/etc/nsswitch.conf", O_RDONLY)    = 3
> read(3, "hosts:      files\n", 4096)    = 18
> read(3, "", 4096)                       = 0

And I guess that's the culprit: in nsswitch.conf you only have
"hosts: files", so

> open("/lib/libnss_files.so.2", O_RDONLY) = 3
> open("/etc/hosts", O_RDONLY)            = 3
> read(3, "127.0.0.1\tlocalhost\n10.0.2.15\tqe"..., 4096) = 35

It only uses /etc/hosts.


So, in your /etc/nsswitch.conf, use

hosts: files dns

Samuel