14 Čen
2017
14 Čen
'17
19:21
Hi there,
I'm having some issues configuring dnstap. I'm using Knot version 2.5.1,
installed via the `knot` package on Debian 3.16.43-2. As per this
documentation
<https://www.knot-dns.cz/docs/2.5/html/modules.html#dnstap-dnstap-traffic-logging>,
I've added the following lines to my config file:
mod-dnstap:
- id: capture_all
sink: "/etc/knot/capture"
template:
- id: default
global-module: mod-dnstap/capture_all
But when starting knot (e.g. by `sudo knotc conf-begin`), I get the message:
error: config, file 'etc/knot/knot.conf', line 20, item 'mod-dnstap',
value
'' (invalid item)
error: failed to load configuration file '/etc/knot/knot.conf' (invalid
item)
I also have the same setup on an Ubuntu 16.04.1 running Knot version
2.4.0-dev, and it works fine.
Any idea what might be causing the issue here? Did the syntax for
mod-dnstap change or something? Should I have installed from source? I do
remember there being some special option you needed to compile a dependency
with to use dnstap when I did this the first time, but I couldn't find
documentation for it when I looked for it.
Thanks!
-Sarah
14 Čen
14 Čen
19:44
Sarah Scheffler wrote:
Any idea what might be causing the issue here? Did
the syntax for
mod-dnstap change or something? Should I have installed from source? I do
remember there being some special option you needed to compile a dependency
with to use dnstap when I did this the first time, but I couldn't find
documentation for it when I looked for it.
Hi, Sarah:
Where did you obtain your knot 2.5.1 package from? Looking at the
official packages from deb.knot-dns.cz
(https://deb.knot-dns.cz/knot/pool/main/k/knot/), I see:
$ dpkg-deb -I ./knot_2.5.1-2+0\~20170613103744.1+jessie\~1.gbp69c8ef_i386.deb
[...]
Depends: adduser, libdnssec4 (= 2.5.1-2+0~20170613103744.1+jessie~1.gbp69c8ef), libknot6
(= 2.5.1-2+0~20170613103744.1+jessie~1.gbp69c8ef), libzscanner1 (=
2.5.1-2+0~20170613103744.1+jessie~1.gbp69c8ef), lsb-base (>= 3.0-6), python,
python-lmdb, python-yaml, init-system-helpers (>= 1.18~), libc6 (>= 2.17), libedit2
(>= 2.11-20080614), libgnutls-deb0-28 (>= 3.3.0), libsystemd0, liburcu2 (>=
0.8.4)
[...]
It doesn't have the fstrm and protobuf-c dependencies that would
indicate dnstap support. Compare to the dependencies for the knot
package in the Debian archive:
$ apt-cache show knot/unstable | grep ^Depends:
Depends: adduser, libdnssec2 (= 2.4.3-1), libknot5 (= 2.4.3-1), libzscanner1 (= 2.4.3-1),
lsb-base (>= 3.0-6), python, python-yaml, init-system-helpers (>= 1.18~), libc6
(>= 2.17), libedit2 (>= 2.11-20080614), libfstrm0 (>= 0.2.0), libgnutls30 (>=
3.5.0), libprotobuf-c1 (>= 1.0.1), libsystemd0, liburcu4 (>= 0.8.4)
(Note the 'libfstrm0' and 'libprotobuf-c1' dependencies.)
That is a pretty confusing error message to print if knot doesn't have
dnstap support enabled, though.
--
Robert Edmonds
edmonds(a)debian.org
20:38
Yes, they come from the packages at deb.knot-dns.cz/knot (by adding `deb
https://deb.knot-dns.cz/knot/ jessie main` to
`/etc/apt/sources.list.d/knot.list` and running `sudo apt-get update`.
For me, running `apt-cache showpkg knot` shows (among other things):
Dependencies:
2.5.1-2+0~20170613103744.1+jessie~1.gbp69c8ef - adduser (0 (null))
libdnssec4 (5 2.5.1-2+0~20170613103744.1+jessie~1.gbp69c8ef) libknot6 (5
2.5.1-2+0~20170613103744.1+jessie~1.gbp69c8ef) libzscanner1 (5
2.5.1-2+0~20170613103744.1+jessie~1.gbp69c8ef) lsb-base (2 3.0-6) python (0
(null)) python-lmdb (0 (null)) python-yaml (0 (null)) init-system-helpers
(2 1.18~) libc6 (2 2.17) libedit2 (2 2.11-20080614) libgnutls-deb0-28 (2
3.3.0) libsystemd0 (0 (null)) liburcu2 (2 0.8.4) systemd (0 (null))
2.4.0-3 - adduser (0 (null)) libdnssec2 (5 2.4.0-3) libknot5 (5 2.4.0-3)
libzscanner1 (5 2.4.0-3) lsb-base (2 3.0-6) python (0 (null)) python-yaml
(0 (null)) init-system-helpers (2 1.18~) libc6 (2 2.17) libedit2 (2
2.11-20080614) libgnutls30 (2 3.5.0) libsystemd0 (0 (null)) liburcu4 (2
0.8.4) systemd (0 (null))
1.6.0-1 - knot-libs (5 1.6.0-1) libc6 (2 2.17) libidn11 (2 1.13) liblmdb0
(2 0.9.7) libssl1.0.0 (2 1.0.0) libsystemd0 (0 (null)) liburcu2 (2 0.8.4)
zlib1g (2 1:1.1.4) init-system-helpers (2 1.18~) adduser (0 (null)) systemd
(0 (null))
Weirdly, it looks like *no* version of knot from the knot-specific
repository has the fstrm or protobuf-c dependencies. Nor do the versions
listed at https://packages.debian.org/stretch/knot or
https://packages.debian.org/jessie/knot , at least, not from the webpage.
This is consistent from what I remember setting this up with the earlier
version a few months ago; I definitely manually installed both libraries
(and several of *their* dependencies, and so on).
For what it's worth, I do have fstrm and protobuf-c installed on this
machine, both built manually, along with dnstap-ldns itself. From what I
can tell by reading a test capture file from my other machine, dnstap is
installed correctly. But knot doesn't seem to be able to deal with it in a
config file anymore.
If the support for dnstap got removed in knot 2.5, then I'll just use 2.4,
which is no problem, but it seems like a puzzling choice to remove it. Is
there a newer, better way to capture the queries and responses?
Thanks again!
-Sarah
On Wed, Jun 14, 2017 at 1:44 PM Robert Edmonds <edmonds(a)debian.org> wrote:
Sarah Scheffler wrote:
Any idea what might be causing the issue here?
Did the syntax for
mod-dnstap change or something? Should I have installed from source? I
do
remember there being some special option you
needed to compile a
dependency
with to use dnstap when I did this the first
time, but I couldn't find
documentation for it when I looked for it.
Hi, Sarah:
Where did you obtain your knot 2.5.1 package from? Looking at the
official packages from deb.knot-dns.cz
(https://deb.knot-dns.cz/knot/pool/main/k/knot/), I see:
$ dpkg-deb -I
./knot_2.5.1-2+0\~20170613103744.1+jessie\~1.gbp69c8ef_i386.deb
[...]
Depends: adduser, libdnssec4 (=
2.5.1-2+0~20170613103744.1+jessie~1.gbp69c8ef), libknot6 (=
2.5.1-2+0~20170613103744.1+jessie~1.gbp69c8ef), libzscanner1 (=
2.5.1-2+0~20170613103744.1+jessie~1.gbp69c8ef), lsb-base (>= 3.0-6),
python, python-lmdb, python-yaml, init-system-helpers (>= 1.18~), libc6 (>=
2.17), libedit2 (>= 2.11-20080614), libgnutls-deb0-28 (>= 3.3.0),
libsystemd0, liburcu2 (>= 0.8.4)
[...]
It doesn't have the fstrm and protobuf-c dependencies that would
indicate dnstap support. Compare to the dependencies for the knot
package in the Debian archive:
$ apt-cache show knot/unstable | grep ^Depends:
Depends: adduser, libdnssec2 (= 2.4.3-1), libknot5 (= 2.4.3-1),
libzscanner1 (= 2.4.3-1), lsb-base (>= 3.0-6), python, python-yaml,
init-system-helpers (>= 1.18~), libc6 (>= 2.17), libedit2 (>=
2.11-20080614), libfstrm0 (>= 0.2.0), libgnutls30 (>= 3.5.0),
libprotobuf-c1 (>= 1.0.1), libsystemd0, liburcu4 (>= 0.8.4)
(Note the 'libfstrm0' and 'libprotobuf-c1' dependencies.)
That is a pretty confusing error message to print if knot doesn't have
dnstap support enabled, though.
--
Robert Edmonds
edmonds(a)debian.org
15 Čen
15 Čen
10:22
Hello Sarah,
The dnstap module is still in Knot 2.5.1 but the package was unintentionally built without
this static module.
We will probably add the module as a separate package. Stay tuned!
The error message means that the configuration is unknown for the server as the module is
missing and
the server doesn't know if the section name is just a typo. I will consider a better
error message for
unknown section names beginning with the "mod-" prefix.
Regards,
Daniel
On 06/14/2017 07:21 PM, Sarah Scheffler wrote:
Hi there,
I'm having some issues configuring dnstap. I'm using Knot version 2.5.1,
installed via the `knot` package on Debian 3.16.43-2. As per this documentation
<https://www.knot-dns.cz/docs/2.5/html/modules.html#dnstap-dnstap-traffic-logging>,
I've added the following lines to my config file:
mod-dnstap:
- id: capture_all
sink: "/etc/knot/capture"
template:
- id: default
global-module: mod-dnstap/capture_all
But when starting knot (e.g. by `sudo knotc conf-begin`), I get the message:
error: config, file 'etc/knot/knot.conf', line 20, item 'mod-dnstap',
value '' (invalid item)
error: failed to load configuration file '/etc/knot/knot.conf' (invalid item)
I also have the same setup on an Ubuntu 16.04.1 running Knot version 2.4.0-dev, and it
works fine.
Any idea what might be causing the issue here? Did the syntax for mod-dnstap change or
something? Should I have installed from source? I do remember there being some special
option you needed to compile a dependency with to use dnstap when I did this the first
time, but I couldn't find documentation for it when I looked for it.
Thanks!
-Sarah
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3 comments
3 participants
participants (3)
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Daniel Salzman -
Robert Edmonds -
Sarah Scheffler