About memcached backend module - knot-dns-users

13 Pro 2017

Hello all,
According to the document, I built memcached as a back end, so I built it from the source,
but the following error message is output and can not be used.
https://knot-resolver.readthedocs.io/en/stable/build.html#building-from-sou…
$ sudo kresd
[system] interactive mode
...
  modules.load 'memcached' error: error
loading module 'memcached' from file
'/usr/local/lib/kdns_modules/memcached.so':
/usr/local/lib/kdns_modules/memcached.so: undefined symbol: luaopen_memcached
error: No such file or directory
...

$ ll /usr/local/lib/kdns_modules/
total 404
drwxr-xr-x 4 root root 4096 Dec 13 21:59 ./
drwxr-xr-x 7 root root 4096 Dec 13 21:59 ../
-rwxr-xr-x 1 root root 35904 Dec 13 21:59 ahocorasick.so*
-rwxr-xr-x 1 root root 38848 Dec 13 21:59 cookies.so*
drwxr-xr-x 2 root root 4096 Dec 13 21:59 daf/
-rw-r--r-- 1 root root 8664 Dec 13 21:59 daf.lua
-rw-r--r-- 1 root root 1098 Dec 13 21:59 detect_time_jump.lua
-rw-r--r-- 1 root root 2329 Dec 13 21:59 detect_time_skew.lua
-rw-r--r-- 1 root root 2218 Dec 13 21:59 dns64.lua
-rwxr-xr-x 1 root root 45016 Dec 13 21:59 dnstap.so*
-rw-r--r-- 1 root root 1204 Dec 13 21:59 etcd.lua
-rw-r--r-- 1 root root 3199 Dec 13 21:59 graphite.lua
-rwxr-xr-x 1 root root 44376 Dec 13 21:59 hints.so*
drwxr-xr-x 2 root root 4096 Dec 13 21:59 http/
-rw-r--r-- 1 root root 11077 Dec 13 21:59 http.lua
-rw-r--r-- 1 root root 1263 Dec 2 00:16 ketcd.lua
-rw-r--r-- 1 root root 7967 Dec 13 21:59 kres-gen.lua
-rw-r--r-- 1 root root 10178 Dec 13 21:59 kres.lua
-rwxr-xr-x 1 root root 14216 Dec 13 21:59 memcached.so*
-rw-r--r-- 1 root root 15867 Dec 13 21:59 policy.lua
-rw-r--r-- 1 root root 5346 Dec 13 21:59 predict.lua
-rw-r--r-- 1 root root 4267 Dec 13 21:59 priming.lua
-rw-r--r-- 1 root root 4313 Dec 13 21:59 prometheus.lua
-rwxr-xr-x 1 root root 18336 Dec 13 21:59 redis.so*
-rw-r--r-- 1 root root 3639 Dec 13 21:59 renumber.lua
-rwxr-xr-x 1 root root 34048 Dec 13 21:59 stats.so*
-rw-r--r-- 1 root root 1818 Dec 13 21:59 ta_signal_query.lua
-rw-r--r-- 1 root root 15314 Dec 13 21:59 trust_anchors.lua
-rw-r--r-- 1 root root 2068 Dec 13 21:59 version.lua
-rw-r--r-- 1 root root 2656 Dec 13 21:59 view.lua
-rw-r--r-- 1 root root 1658 Dec 13 21:59 workarounds.lua
-rw-r--r-- 1 root root 5307 Dec 13 21:59 zonefile.lua
Is it something you need to do with a description other than documentation?
The source file is working with knot-resolver-1.5.1.
env:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial
$ sudo make info PREFIX="/usr/local" ETCDIR="/etc/knot-resolver/"
CFLAGS="-fstack-protector"
fatal: Not a git repository (or any of the parent directories): .git
Target: Knot DNS Resolver 1.5.1-POSIX
Compiler: cc -fstack-protector -std=c99 -D_GNU_SOURCE -Wno-unused -Wtype-limits -Wformat
-Wformat-security -Wall -I/home/kometch/knot-resolver-1.5.1
-I/home/kometch/knot-resolver-1.5.1/lib/generic
-I/home/kometch/knot-resolver-1.5.1/contrib
-I/home/kometch/knot-resolver-1.5.1/contrib/lmdb
-DPACKAGE_VERSION="\"1.5.1\""
-DPREFIX="\"/usr/local\""
-DMODULEDIR="\"/usr/local/lib/kdns_modules\"" -O2 -D_FORTIFY_SOURCE=2
-I/usr/include/p11-kit-1 -I/usr/include/luajit-2.1 -I/usr/include/p11-kit-1
-Icontrib/ccan/compiler -Icontrib/ccan/ilog -Icontrib/ccan/isaac -Icontrib/ccan/json
-Icontrib/ccan/asprintf -Icontrib/murmurhash3 -DENABLE_COOKIES
Variables
---------
HARDENING: yes
BUILDMODE: dynamic
PREFIX: /usr/local
PREFIX: /usr/local
DESTDIR:
BINDIR: /usr/local/bin
SBINDIR: /usr/local/sbin
LIBDIR: /usr/local/lib
ETCDIR: /etc/knot-resolver/
INCLUDEDIR: /usr/local/include
MODULEDIR: /usr/local/lib/kdns_modules
Core Dependencies
------------
[yes] libknot (lib)
[yes] embedded lmdb (lib)
[yes] luajit (daemon)
[yes] libuv (daemon)
[yes] libgnutls (daemon)
Optional
--------
[no] doxygen (doc)
[no] sphinx-build (doc)
[no] python-breathe (doc)
[yes] go (modules/go, Go buildmode=c-shared support)
[yes] libmemcached (modules/memcached)
[yes] hiredis (modules/redis)
[yes] cmocka (tests/unit)
[yes] systemd (daemon)
[yes] nettle (modules/cookies)
[yes] Lua socket ltn12 (trust anchor bootstrapping)
[yes] Lua ssl.https (trust anchor bootstrapping)
[yes] libedit (client)
[yes] libfstrm (modules/dnstap)
[yes] libprotobuf-c (modules/dnstap)
[yes] proto-c (modules/dnstap)
[yes] lcov (code coverage)
[yes] luacov (code coverage)
make: Nothing to be done for 'info'.
ii libmemcached-dev 1.0.18-4.1 arm64 C and C++ client library to the memcached server
(development files)
ii libmemcached-tools 1.0.18-4.1 arm64 Commandline tools for talking to memcached via
libmemcached
ii libmemcached11:arm64 1.0.18-4.1 arm64 C and C++ client library to the memcached server
ii libmemcachedutil2:arm64 1.0.18-4.1 arm64 library implementing connection pooling for
libmemcached
$ sudo memcached -V
memcached 1.5.3
Best regards.