On Mon, Jul 03, 2006 at 11:11:02AM +0200, dmanye wrote:
> Herbert Poetzl wrote:
> >On Fri, Jun 30, 2006 at 01:12:50PM +0200, dmanye wrote:
> >
> >>hi,
> >>
> >>i've a debian etch host with kernel 2.6.16-2-vserver-686 original from
> >>debian. util-vserver version is 0.30.210-10 original from debian also.
> >>
> >>i've created some vservers (debian sarge) with no problems but now i
> >>want to build a rembo [v]server on a debian sarge guest. rembo is a
> >>comercial/closed-source (sorry) pxe server from www.rembo.com. all went
> >>fine until i tried to start the daemon:
> >>
> >># ./rembo
> >>Rembo Server 2.0 Toolkit (build 058.2)
> >>(c) 1999-2003 Rembo Technology SaRL, Geneva, Switzerland
> >>Error on interface 10.20.102.239
> >># strace ./rembo -d 2>&1 | tail -n 25
> >>open("./rembo", O_RDONLY) = 3
> >>lseek(3, 0, SEEK_END) = 1238692
> >>lseek(3, 0, SEEK_SET) = 0
> >>mmap2(NULL, 1241088, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
> >>-1, 0) = 0xb7cd6000
> >>read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\2\0\3\0\1\0\0\0\0\241\4"...,
> >>1238692) = 1238692
> >>open("rembo.conf", O_RDONLY) = 4
> >>fstat64(4, {st_mode=S_IFREG|0644, st_size=91, ...}) = 0
> >>mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
> >>0) = 0xb7f87000
> >>fstat64(4, {st_mode=S_IFREG|0644, st_size=91, ...}) = 0
> >>_llseek(4, 0, [0], SEEK_SET) = 0
> >>read(4, "\n BaseDir \"/rembo\"\n "..., 91) = 91
> >>_llseek(4, 91, [91], SEEK_SET) = 0
> >>close(4) = 0
> >>munmap(0xb7f87000, 4096) = 0
> >>socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 4
> >>bind(4, {sa_family=AF_INET, sin_port=htons(0),
> >>sin_addr=inet_addr("127.0.0.1")}, 16) = 0
> >>getsockname(4, {sa_family=AF_INET, sin_port=htons(33007),
> >>
> >
> >it looks like it is looking up 'lo' inside the guest,
> >you might try to add 127.0.0.1 as a separate 'nodev'
> >entry to the guest, or to disable the hide_netif flag
> >
> this is what i have on the host:
>
> # cd /etc/vservers/alf/interfaces/
> mosques:/etc/vservers/alf/interfaces# ls
> 0 1
> mosques:/etc/vservers/alf/interfaces# ls 1/
> dev ip mask nodev
> mosques:/etc/vservers/alf/interfaces# cat 1/*
> lo
> 127.0.0.1
> 8
~~~ looks like a 'prefix' to me, the mask would
be 255.0.0.0, no?
> i can ping localhost and 127.0.0.1 inside the vserver but this
> does not work: the rembo daemon does not start. also, i've added
> CAP_NET_ADMIN and got the same result.
>
> what i think may bring some light is the following:
> if i try to execute the server (it is statically linked) on the host
> it works!
> so i've compared the output of strace and i get:
>
> alf (vserver):
> ...
> socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 4
> bind(4, {sa_family=AF_INET, sin_port=htons(0),
> sin_addr=inet_addr("127.0.0.1")}, 16) = 0
> getsockname(4, {sa_family=AF_INET, sin_port=htons(33018),
> sin_addr=inet_addr("10.20.102.239")}, [16]) = 0
> futex(0xb7f5b1f0, FUTEX_WAKE, 2147483647) = 0
> write(2, "Error on interface 10.20.102.239"..., 33Error on interface
> 10.20.102.239
>
> and it dies.
>
> mosques(host):
> ...
> socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 4
> bind(4, {sa_family=AF_INET, sin_port=htons(0),
> sin_addr=inet_addr("127.0.0.1")}, 16) = 0
> getsockname(4, {sa_family=AF_INET, sin_port=htons(33018),
> sin_addr=inet_addr("127.0.0.1")}, [16]) = 0
> close(4) = 0
> uname({sys="Linux", node="mosques", ...}) = 0
> ... and continue ahead.
>
>
> after the 'bind' call, why does alf execute a getsockname with
> 10.20.102.239 (just before die) while mosques pass 127.0.0.1 and
> continues successfully? is it due to chbind?
probably, the src address rewriting does the expected
thing here, mapping 127.0.0.1 to the first assigned
ip of the guest ...
> once more is clear that not having the source code is like selling
> your soul, but we have no other viable alternative.
>
> >>sin_addr=inet_addr("10.20.102.239")}, [16]) = 0
> >>futex(0xb7f3a1f0, FUTEX_WAKE, 2147483647) = 0
> >>write(2, "Error on interface 10.20.102.239"..., 33Error on interface
> >>10.20.102.239) = 33
> >>write(1, "Rembo Server 2.0 Toolkit (build "..., 96Rembo Server 2.0
> >>Toolkit (build 058.2)
> >>(c) 1999-2003 Rembo Technology SaRL, Geneva, Switzerland) = 96
> >>munmap(0xb7f88000, 4096) = 0
> >>exit_group(0) = ?
> >>
> >>i've have a couple of non-vserver servers with sarge+rembo running
> >>perfectly so i think is a rembo-vserver compatibility issue.
> >>
> >
> >you might also try to 'change' the configuration of
> >that pxe server to _not_ use 127.0.0.1 (and use localhost
> >or the first assigned ip instead)
> >
> >
> don't know why that code looks for 127.0.0.1. on the other 'real'
> rembo servers i have there's nothing in the config about the 'lo'
> interface.
probably because folks there confused 'localhost'
with 127.0.0.1 and simply substituted ... a not
really uncommon lapse
> >>the vserver has a couple of bcapabilities in order to run also a
> >>dhcp server: CAP_NET_RAW and CAP_NET_BROADCAST.
> >>
> >
> >CAP_NET_BROADCAST is not used, so it's unlikely you need
> >that one ... but it doesn't hurt either :)
> >
> i need it because i run a dhcpd server on the same vserser (as i do in
> the 'real' other rembo servers).
well, what I meant was, the kernel does not use it
anymore, so having it has no advantage whatsoever
compared to missing it :)
best,
Herbert
> >>thanks in advance.
> >>
> >
> >HTH,
> >Herbert
> >
> >
> >>begin:vcard
> >>fn;quoted-printable:david many=C3=A9
> >>n;quoted-printable:many=C3=A9;david
> >>org;quoted-printable:Universitat Rovira i Virgili;Departament
> >>d'Enginyeria Inform=C3=A0tica i Matem=C3=A0tiques
> >>adr;quoted-printable;dom:;;Av. dels Pa=C3=AFsos Catalans,
> >>26;Tarragona;;43007
> >>email;internet:dmanye@urv.cat
> >>tel;work:977559706
> >>version:2.1
> >>end:vcard
> >>
> >>
> >
> >
> >>_______________________________________________
> >>Vserver mailing list
> >>Vserver@list.linux-vserver.org
> >>http://list.linux-vserver.org/mailman/listinfo/vserver
> >>
> >
> >
>
> begin:vcard
> fn;quoted-printable:david many=C3=A9
> n;quoted-printable:many=C3=A9;david
> org;quoted-printable:Universitat Rovira i Virgili;Departament d'Enginyeria Inform=C3=A0tica i Matem=C3=A0tiques
> adr;quoted-printable;dom:;;Av. dels Pa=C3=AFsos Catalans, 26;Tarragona;;43007
> email;internet:dmanye@urv.cat
> tel;work:977559706
> version:2.1
> end:vcard
>
_______________________________________________
Vserver mailing list
Vserver@list.linux-vserver.org
http://list.linux-vserver.org/mailman/listinfo/vserver
Received on Mon Jul 3 16:38:52 2006