[SR-Users] Can't connect to local MySQL server (13 "Permission denied")

[Henning Westerholt]

Am Freitag, 31. August 2018, 09:07:51 CEST schrieb Ginhoux, Patrick:
> In a previous post ([SR-Users] Questions about changes between 5.0.1 and
> 5.0.7
> <https://lists.kamailio.org/pipermail/sr-users/2018-August/102442.html> ), I
> reported problem to upgrade my kamailio from 5.0.1 to 5.0.7-7 level.
> 
> With help from some people, it was finally fixed on my test server in my
> lab.

Hello Patrick,

the mysql module will usually just give you the error message back from the 
server/mysql client library.

Can you try to connect with the "mysql" client command on the command line to 
connect to the local server, with the same username/password as in your 
Kamailio configuration?
 
> Now I was expecting to do the same upgrade on a real server using these
> packages:
> 
> kamailio-5.0.7-7.el7.x86_64.rpm 
> kamailio-ims-5.0.7-7.el7.x86_64.rpm 
> kamailio-mysql-5.0.7-7.el7.x86_64.rpm 
> kamailio-perl-5.0.7-7.el7.x86_64.rpm 
> kamailio-snmpstats-5.0.7-7.el7.x86_64.rpm
> 
> But kamailio failed to connect the local MySQL server :
> 
> Aug 31 08:16:20 in52inmvt2router1-mvt-tpm-sipr /usr/sbin/kamailio[6365]:
> DEBUG: <core> [db.c:209]: db_bind_mod(): using db bind api for db_mysql
> 
> Aug 31 08:16:20 in52inmvt2router1-mvt-tpm-sipr /usr/sbin/kamailio[6365]:
> DEBUG: <core> [db.c:314]: db_do_init2(): connection 0x7fef779958f8 not found
> in pool
> 
> Aug 31 08:16:20 in52inmvt2router1-mvt-tpm-sipr /usr/sbin/kamailio[6365]:
> DEBUG: db_mysql [km_my_con.c:98]: db_mysql_new_connection(): opening
> connection: mysql://xxxx:xxxx@localhost/siprouter
> 
> Aug 31 08:16:20 in52inmvt2router1-mvt-tpm-sipr /usr/sbin/kamailio[6365]:
> ERROR: db_mysql [km_my_con.c:129]: db_mysql_new_connection(): driver error:
> Can't connect to local MySQL server through socket
> '/var/lib/mysql/mysql.sock' (13 "Permission denied")
> 
> Aug 31 08:16:20 in52inmvt2router1-mvt-tpm-sipr /usr/sbin/kamailio[6365]:
> ERROR: <core> [db.c:318]: db_do_init2(): could not add connection to the
> pool
> 
> Aug 31 08:16:20 in52inmvt2router1-mvt-tpm-sipr /usr/sbin/kamailio[6365]:
> ERROR: htable [ht_db.c:92]: ht_db_open_con(): failed to connect to the
> database
> 
> Aug 31 08:16:20 in52inmvt2router1-mvt-tpm-sipr /usr/sbin/kamailio[6365]:
> ERROR: <core> [core/sr_module.c:974]: init_mod(): Error while initializing
> module htable (/usr/lib64/kamailio/modules/htable.so)
> 
> 
> 
> My "kamailio.cfg" contains the following command:
> 
> 
> 
> modparam("htable", "db_url",
> "mysql://siprouter:password@localhost/siprouter")
> 
> 
> 
> The service unit : "/usr/lib/systemd/system/kamailio.service" content is :
> 
> 
> 
> [Unit]
> 
> Description=Kamailio (OpenSER) - the Open Source SIP Server
> 
> After=network.target mysql.service
> 
> 
> 
> [Service]
> 
> Type=simple
> 
> User=kamailio
> 
> Group=kamailio
> 
> Environment='CFGFILE=/etc/kamailio/kamailio.cfg'
> 
> Environment='SHM_MEMORY=1024'
> 
> Environment='PKG_MEMORY=8'
> 
> EnvironmentFile=-/etc/sysconfig/kamailio
> 
> ExecStart=/usr/sbin/kamailio -DD -P /var/run/kamailio/kamailio.pid -f
> $CFGFILE -m $SHM_MEMORY -M $PKG_MEMORY
> 
> Restart=on-failure
> 
> 
> 
> [Install]
> 
> WantedBy=multi-user.target
> 
> 
> 
> The "/etc/sysconfig/kamailio" content is :
> 
> 
> 
> #
> 
> # Kamailio startup options
> 
> #
> 
> 
> 
> #
> 
> # Kamailio startup options
> 
> #
> 
> 
> 
> # Set to yes to enable kamailio, once configured properly.
> 
> RUN_KAMAILIO=yes
> 
> 
> 
> # User to run as
> 
> USER=kamailio
> 
> 
> 
> # Group to run as
> 
> GROUP=kamailio
> 
> 
> 
> # Amount of shared memory to allocate for the running Kamailio server (in
> Mb)
> 
> SHM_MEMORY=1024
> 
> 
> 
> # Amount of per-process (package) memory to allocate for Kamailio (in Mb)
> 
> PKG_MEMORY=8
> 
> 
> 
> Below the existing user in mysql :
> 
> 
> 
> mysql:root:(none)> use mysql;
> 
> Database changed
> 
> mysql:root:mysql> select user,host from user;
> 
> +-----------+-----------+
> 
> | user      | host      |
> 
> +-----------+-----------+
> 
> | myadmin   | %         |
> | 
> | siprouter | %         |
> | 
> | kamailio  | localhost |
> | 
> | root      | localhost |
> 
> +-----------+-----------+
> 
> I have a symlink to locate the my.cnf : ln -s /myqdata/mysiprdb/data/my.cnf
> /etc/my.cnf
> 
> And also this link to fix a htable reload problem : ln -s
> /myqdata/mysiprdb/data/mysiprdb.sock /var/lib/mysql/mysql.sock
> 
> 
> 
> I don't find what the problem is this time.
> 
> 
> 
> So if there is people that could help on the issue, thanks in advance.
> 
> 
> 
> Cordialement.
> 
> Patrick GINHOUX


-- 
Henning Westerholt
https://skalatan.de/blog/