[Pkg-libvirt-maintainers] Bug#690540: Bug#690540: libvirt-bin: dnsmasq should not use option --bind-interfaces
Guido Günther
agx at sigxcpu.org
Mon Oct 15 14:09:17 UTC 2012
On Mon, Oct 15, 2012 at 01:09:38PM +0200, Luca Capello wrote:
> Package: libvirt-bin
> Version: 0.9.12-5
> Severity: wishlist
> Tags: pca.it-virtualization
>
> Hi there!
>
> While debugging #689221, I experienced such a bug, which is actually the
> counterpart of #504605, which I still think it deserves a better
> solution ;-)
bind-interaces makes sure that dnsmasq only binds to the interfaces used
by your libvirt configuration so I think it's correct.. I'm not sure I
understand why this is bad.
The dnsmasq you start afterwards should ignore those. Let's take Simon
into the loop since I'd value his opinion on this one.
Cheers,
-- Guido
>
> =====
> root at gismo:/srv/tftp/QNAP_TS-409U# ps aux | grep virt
> nobody 1480 0.0 0.0 19864 908 ? S 12:16 0:00 \
> /usr/sbin/dnsmasq --strict-order --bind-interfaces \
> --pid-file=/var/run/libvirt/network/default.pid --conf-file= \
> --except-interface lo --listen-address 192.168.122.1 \
> --dhcp-range 192.168.122.2,192.168.122.254 \
> --dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases \
> --dhcp-lease-max=253 --dhcp-no-override \
> --dhcp-hostsfile=/var/lib/libvirt/dnsmasq/default.hostsfile
> root 3134 0.0 0.2 273392 7084 ? Sl Oct14 0:00 /usr/sbin/libvirtd -d
> root 4045 0.0 0.0 7828 888 pts/5 S+ 12:27 0:00 grep virt
>
> root at gismo:/srv/tftp/QNAP_TS-409U# ip a s
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> inet 127.0.0.1/8 scope host lo
> inet6 ::1/128 scope host
> valid_lft forever preferred_lft forever
> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
> link/ether 00:16:d3:2c:fc:f5 brd ff:ff:ff:ff:ff:ff
> inet 192.168.0.11/24 scope global eth0
> inet6 fe80::216:d3ff:fe2c:fcf5/64 scope link
> valid_lft forever preferred_lft forever
> 3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN qlen 1000
> link/ether 00:19:d2:07:2c:a0 brd ff:ff:ff:ff:ff:ff
> 6: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
> link/ether ea:65:11:58:3b:99 brd ff:ff:ff:ff:ff:ff
> inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
>
> root at gismo:/srv/tftp/QNAP_TS-409U# dnsmasq --no-daemon \
> --enable-tftp --tftp-root=/srv/tftp/QNAP_TS-409U/
>
> dnsmasq: failed to create listening socket for port 53: Address already in use
>
> root at gismo:/srv/tftp/QNAP_TS-409U# dnsmasq --no-daemon \
> --enable-tftp --tftp-root=/srv/tftp/QNAP_TS-409U/ \
> --bind-interfaces
>
> dnsmasq: failed to create listening socket for 192.168.122.1: Address already in use
>
> root at gismo:/srv/tftp/QNAP_TS-409U# dnsmasq--no-daemon \
> --enable-tftp --tftp-root=/srv/tftp/QNAP_TS-409U/ \
> --bind-interfaces --except-interface virbr0
> dnsmasq: started, version 2.63 cachesize 150
> dnsmasq: compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack
> dnsmasq-tftp: TFTP root is /srv/tftp/QNAP_TS-409U/
> dnsmasq: reading /etc/resolv.conf
> dnsmasq: using nameserver 192.168.210.1#53
> dnsmasq: read /etc/hosts - 11 addresses
> ^C
>
> root at gismo:/srv/tftp/QNAP_TS-409U#
> =====
>
> Even after having read #504605, I fail to see why dnsmasq started by
> libvirt should need --bind-interfaces at all, but I am probably missing
> something. dnsmasq_2.63 introduced a new bind option, I would say
> better than the above:
>
> --bind-dynamic
> Enable a network mode which is a hybrid between
> --bind-interfaces and the default. Dnsmasq binds the
> address of individual interfaces, allowing multiple
> dnsmasq instances, but if new interfaces or addresses
> appear, it automatically listens on those (subject to
> any access-control configuration). This makes
> dynamically created interfaces work in the same way as
> the default. Implementing this option requires
> non-standard networking APIs and it is only available
> under Linux. On other platforms it falls-back to
> --bind-interfaces mode.
>
> Thx, bye,
> Gismo / Luca
>
> -- System Information:
> Debian Release: wheezy/sid
> APT prefers unstable
> APT policy: (990, 'unstable'), (1, 'experimental')
> Architecture: amd64 (x86_64)
>
> Kernel: Linux 3.5-trunk-amd64 (SMP w/2 CPU cores)
> Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
>
> Versions of packages libvirt-bin depends on:
> ii adduser 3.113+nmu3
> ii gettext-base 0.18.1.1-9
> ii libavahi-client3 0.6.31-1
> ii libavahi-common3 0.6.31-1
> ii libblkid1 2.20.1-5.2
> ii libc6 2.13-35
> ii libcap-ng0 0.6.6-2
> ii libdbus-1-3 1.6.8-1
> ii libdevmapper1.02.1 2:1.02.74-4
> ii libgcrypt11 1.5.0-3
> ii libgnutls26 2.12.20-1
> ii libnetcf1 0.2.0-4
> ii libnl1 1.1-7
> ii libnuma1 2.0.8~rc4-1
> ii libparted0debian1 2.3-11
> ii libpcap0.8 1.3.0-1
> ii libpciaccess0 0.13.1-2
> ii libreadline6 6.2-9
> ii libsasl2-2 2.1.25.dfsg1-5
> ii libudev0 175-7
> ii libvirt0 0.9.12-5
> ii libxenstore3.0 4.1.3-3
> ii libxml2 2.8.0+dfsg1-6
> ii libyajl2 2.0.4-2
> ii logrotate 3.8.2-1
>
> Versions of packages libvirt-bin recommends:
> ii bridge-utils 1.5-4
> ii dmidecode 2.11+20120326-2
> ii dnsmasq-base 2.63-4
> ii ebtables 2.0.10.4-1
> ii gawk 1:4.0.1+dfsg-2
> ii iproute 20120521-3
> ii iptables 1.4.14-3
> ii libxml2-utils 2.8.0+dfsg1-6
> ii netcat-openbsd 1.105-7
> ii parted 2.3-11
> ii qemu 1.1.2+dfsg-2
> ii qemu-kvm 1.1.2+dfsg-2
>
> Versions of packages libvirt-bin suggests:
> ii policykit-1 0.105-1
> pn radvd <none>
>
> -- Configuration Files:
> /etc/libvirt/qemu.conf changed:
> user = "luca"
> vnc_allow_host_audio = 1
>
> /etc/libvirt/qemu/networks/default.xml changed:
> <network>
> <name>default</name>
> <bridge name="virbr0" />
> <forward/>
> <ip address="192.168.122.1" netmask="255.255.255.0">
> <dhcp>
> <range start="192.168.122.2" end="192.168.122.254" />
> </dhcp>
> </ip>
> </network>
>
>
> -- no debconf information
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