27(24762) ERROR: db_mysql [km_my_con.c:109]: driver error: Can't connect to MySQL server on 'xxxxxxxxx' (4)

Hi All I have tried the below with Kamailio 3.1.0 and 3.2.1. the problem is that Kamailio at times fails to start up for no obvious reasons, I.e. in 10 restarts Kamailio might fail to start 3,0 or 5 times. Te debug log "level 2 " shows the following : 27(24762) ERROR: db_mysql [km_my_con.c:109]: driver error: Can't connect to MySQL server on 'xxxxxxxxx' (4) 27(24762) ERROR: <core> [db.c:303]: could not add connection to the pool27(24762) ERROR: group [group.c:211]: unable to connect to the database 27(24762) ERROR: <core> [sr_module.c:889]: init_mod_child(): Error while initializing module group (/usr/local/kamailio/lib/kamailio/modules_k/group.so) 27(24762) ERROR: <core> [pt.c:481]: ERROR: fork_tcp_process(): init_child failed for process 27, pid 24762, "tcp receiver child=1" and then 30(24765) : <core> [pass_fd.c:293]: ERROR: receive_fd: EOF on 45 0(24735) ALERT: <core> [main.c:748]: child process 24762 exited normally, status=255 0(24735) INFO: <core> [main.c:766]: INFO: terminating due to SIGCHLD The problem happens on 4 different servers, I did try to compile more than once, the servers are 32 Bit CentOS 5.6. The connection to the database is monitored and there are no issues with connecting to the DB "it works at times and times not for Kamailio so a user/pwd issue is not likely to cause this, manual cnnect worked", config file errors are not found. I did also check max no of connections on MySQL server which is set to 500 on the server and only 100 cons are used. The group module uses the same connection string as other modules which is predefined and there are other modules that access the db before the group module and those do not have a problem. Please advice. Regards _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

Hi, forget the whole list of errors and just resolve the DB connectivity between the Kamailio server and DB server first . try connecting to the remote DB server 'xxxxxxxxx' from linux shell i.e # mysql -u<user> -p<passwd> -h 'xxxxxxxxx' Regards, Sammy On Fri, Dec 30, 2011 at 3:33 PM, Ali Jawad &lt;ali.jawad(a)splendor.net&gt; wrote: > > Hi All > I have tried the below with Kamailio 3.1.0 and 3.2.1. the problem is > that Kamailio at times fails to start up for no obvious reasons, I.e. > in 10 restarts Kamailio might fail to start 3,0 or 5 times. Te debug > log "level 2 " shows the following : > > 27(24762) ERROR: <core> [db.c:303]: could not add connection to the > pool27(24762) ERROR: group [group.c:211]: unable to connect to the > database > 27(24762) ERROR: <core> [sr_module.c:889]: init_mod_child(): Error > while initializing module group > (/usr/local/kamailio/lib/kamailio/modules_k/group.so) > 27(24762) ERROR: <core> [pt.c:481]: ERROR: fork_tcp_process(): > init_child failed for process 27, pid 24762, "tcp receiver child=1" > > and then > > > 30(24765) : <core> [pass_fd.c:293]: ERROR: receive_fd: EOF on 45 >  0(24735) ALERT: <core> [main.c:748]: child process 24762 exited > normally, status=255 >  0(24735) INFO: <core> [main.c:766]: INFO: terminating due to SIGCHLD > > The problem happens on 4 different servers, I did try to compile more > than once, the servers are 32 Bit CentOS 5.6. The connection to the > database is monitored and there are no issues with connecting to the > DB "it works at times and times not for Kamailio so a user/pwd issue > is not likely to cause this, manual cnnect worked", config file errors > are not found. > > I did also check max no of connections on MySQL server which is set to > 500 on the server and only 100 cons are used. The group module uses > the same connection string as other modules  which is predefined  and > there are other modules that access the db before the group module and > those do not have a problem. > > Please advice. > > Regards > > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > sr-users(a)lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

Hello, check also for limits in the system/firewall, maybe there are limits on new connections per second. Try with children=1 and see if it happens again, if not, then it is something that blocks many new connections in short time. Cheers, Daniel On 1/2/12 5:31 AM, Sammy Govind wrote: Hi, Its all upto you then, that's an intermittent issue and information is not complete to trace the issue. Did you see the same Errors every time it fails !? -- Regards Sammy On Sun, Jan 1, 2012 at 10:06 PM, Ali Jawad&lt;ali.jawad(a)splendor.net&gt;  wrote: _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users -- Daniel-Constantin Mierla -- http://www.asipto.com http://linkedin.com/in/miconda -- http://twitter.com/miconda _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

Hello, On 1/2/12 12:24 PM, Ali Jawad wrote: limits can be from kernel, selinix, mysql server  a.s.o. not only from firewalls. This will create only one worker process (not advisable for production in long term, just for testing) -- in this way there should be very few mysql connections opened, revealing if there is a problem or not with the number of connections and the short period to create them. Cheers, Daniel -- Daniel-Constantin Mierla -- http://www.asipto.com http://linkedin.com/in/miconda -- http://twitter.com/miconda

Hello, On 1/3/12 9:14 AM, Ali Jawad wrote: the capacity of handling sip traffic is lowered. You should still be able to handle couple of hundred messages per second if you don't have slow sql/dns operations. For production, it is recommended to have at least 8 to be in safe side. So mysql is on a different server, right? Are you sure there is no other switch/router doing such throttling? Can you watch on both kamailio and mysql server to see if the connections are initiated from kamailio and reaching mysql? Maybe you can discover if mysql server get the tcp connection but refuses it -- not sure if mysql server can run in debug/verbose mode to get some log messages with hints about what is the problem. If the tcp connection does not get to mysql server, then it is a throttling in mysql client library or on a device in between the servers. If you do 'kamctl ps' when having children=3, how many kamailio processes are there (extra should be timers, ...)? Each should have one mysql connection, so it helps to see at which number the limit starts. Cheers, Daniel -- Daniel-Constantin Mierla -- http://www.asipto.com http://linkedin.com/in/miconda -- http://twitter.com/miconda

Hello, all it is fine with the output. So it looks like the limit is somewhere above 25 connections. As a try of making a workaround in kamailio side, could be a patch to add a global parameter to introduce some latency before forking a worker, so these processes won't be created all at a time, but one after the other. However, would be good to find the real reason for such behavior. If the tcp connection gets to mysql server, maybe the question should be addressed to mysql forums/mailing lists. Cheers, Daniel On 1/3/12 10:48 AM, Ali Jawad wrote: > Hi > I dont think a few hundred per second is enough I need to find out > what is wrong and bring up no of children to 8. The MySQL server is at > another host on the same LAN, as for the command kamctl ps see below > > Process:: ID=0 PID=13949 Type=attendant > Process:: ID=1 PID=13950 Type=udp receiver child=0 sock=xx.xx.xx.xx:5060 > Process:: ID=2 PID=13951 Type=udp receiver child=1 sock=xx.xx.xx.xx:5060 > Process:: ID=3 PID=13952 Type=udp receiver child=2 sock=xx.xx.xx.xx:5060 > Process:: ID=4 PID=13953 Type=udp receiver child=0 sock=xx.xx.xx.xx:5061 > Process:: ID=5 PID=13954 Type=udp receiver child=1 sock=xx.xx.xx.xx:5061 > Process:: ID=6 PID=13955 Type=udp receiver child=2 sock=xx.xx.xx.xx:5061 > Process:: ID=7 PID=13956 Type=udp receiver child=0 sock=xx.xx.xx.xx:443 > Process:: ID=8 PID=13957 Type=udp receiver child=1 sock=xx.xx.xx.xx:443 > Process:: ID=9 PID=13958 Type=udp receiver child=2 sock=xx.xx.xx.xx:443 > Process:: ID=10 PID=13959 Type=udp receiver child=0 > sock=xx.xx.xx.xx:8080 > Process:: ID=11 PID=13960 Type=udp receiver child=1 > sock=xx.xx.xx.xx:8080 > Process:: ID=12 PID=13961 Type=udp receiver child=2 > sock=xx.xx.xx.xx:8080 > Process:: ID=13 PID=13962 Type=udp receiver child=0 sock=xx.xx.xx.xx:123 > Process:: ID=14 PID=13963 Type=udp receiver child=1 sock=xx.xx.xx.xx:123 > Process:: ID=15 PID=13964 Type=udp receiver child=2 sock=xx.xx.xx.xx:123 > Process:: ID=16 PID=13965 Type=slow timer > Process:: ID=17 PID=13966 Type=timer > Process:: ID=18 PID=13967 Type=MI FIFO > Process:: ID=19 PID=13968 Type=ctl handler > Process:: ID=20 PID=13969 Type=TIMER NH > Process:: ID=21 PID=13970 Type=tcp receiver child=0 > Process:: ID=22 PID=13971 Type=tcp receiver child=1 > Process:: ID=23 PID=13972 Type=tcp receiver child=2 > Process:: ID=24 PID=13973 Type=tcp main process > > I use a few different ports as you can see. > > > All fine with that output at 3 ? > > Regards > > On Tue, Jan 3, 2012 at 11:29 AM, Daniel-Constantin Mierla > &lt;miconda(a)gmail.com&gt; wrote: >> Hello, >> >> >> On 1/3/12 9:14 AM, Ali Jawad wrote: >>> Hi Daniel >>> >>> SeLinux is disabled, as I have played around with Children and got a >>> stable startup at CHILDREN=3, at 4 and up I get the problem described >>> earlier right away, so it seems that MySQL is throttling Kamailio ? >>> >>> 1- What is the effect of running 3 children only ? >> the capacity of handling sip traffic is lowered. You should still be >> able to >> handle couple of hundred messages per second if you don't have slow >> sql/dns >> operations. For production, it is recommended to have at least 8 to be >> in >> safe side. >> >> >>> 2- I know this is not a Kamailio thing, but any idea about what needs >>> to be changed on MySQL server to accommodate more children ? No of >>> connections is 500 conns out of which max 120 are utilized >> So mysql is on a different server, right? Are you sure there is no other >> switch/router doing such throttling? Can you watch on both kamailio and >> mysql server to see if the connections are initiated from kamailio and >> reaching mysql? Maybe you can discover if mysql server get the tcp >> connection but refuses it -- not sure if mysql server can run in >> debug/verbose mode to get some log messages with hints about what is the >> problem. >> >> If the tcp connection does not get to mysql server, then it is a >> throttling >> in mysql client library or on a device in between the servers. >> >> If you do 'kamctl ps' when having children=3, how many kamailio >> processes >> are there (extra should be timers, ...)? Each should have one mysql >> connection, so it helps to see at which number the limit starts. >> >> Cheers, >> Daniel >> >>> Regards >>> >>> On Mon, Jan 2, 2012 at 1:31 PM, Daniel-Constantin Mierla >>> &lt;miconda(a)gmail.com&gt; wrote: >>>> Hello, >>>> >>>> >>>> On 1/2/12 12:24 PM, Ali Jawad wrote: >>>>> Hi Daniel >>>>> Running on a LAN with no firewalls enabled, >>>> >>>> limits can be from kernel, selinix, mysql server a.s.o. not only from >>>> firewalls. >>>> >>>> >>>>> will try you suggestion >>>>> though first thing tomorrow morning, what are the implications of >>>>> running children=1 ? >>>> >>>> This will create only one worker process (not advisable for production >>>> in >>>> long term, just for testing) -- in this way there should be very few >>>> mysql >>>> connections opened, revealing if there is a problem or not with the >>>> number >>>> of connections and the short period to create them. >>>> >>>> Cheers, >>>> Daniel >>>> >>>>> Thanks >>>>> >>>>> On Mon, Jan 2, 2012 at 2:03 PM, Daniel-Constantin Mierla >>>>> &lt;miconda(a)gmail.com&gt; wrote: >>>>>> Hello, >>>>>> >>>>>> check also for limits in the system/firewall, maybe there are limits >>>>>> on >>>>>> new >>>>>> connections per second. Try with children=1 and see if it happens >>>>>> again, >>>>>> if >>>>>> not, then it is something that blocks many new connections in short >>>>>> time. >>>>>> >>>>>> Cheers, >>>>>> Daniel >>>>>> >>>>>> >>>>>> On 1/2/12 5:31 AM, Sammy Govind wrote: >>>>>> >>>>>> Hi, >>>>>> Its all upto you then, that's an intermittent issue and information >>>>>> is >>>>>> not >>>>>> complete to trace the issue. Did you see the same Errors every time >>>>>> it >>>>>> fails >>>>>> !? >>>>>> >>>>>> -- >>>>>> Regards >>>>>> Sammy >>>>>> >>>>>> On Sun, Jan 1, 2012 at 10:06 PM, Ali Jawad&lt;ali.jawad(a)splendor.net&gt; >>>>>> wrote: >>>>>>> Hi >>>>>>> Thanks for your input, but as said this works at times yes and >>>>>>> times >>>>>>> now so I am not sure it is a definite DB issue, the servers are in >>>>>>> the >>>>>>> same LAN, and there are other modules that use the DB string that >>>>>>> work >>>>>>> when launched before this one while this one does not work. >>>>>>> Regards >>>>>>> >>>>>>> On Sun, Jan 1, 2012 at 4:13 PM, Sammy Govind&lt;govoiper(a)gmail.com&gt; >>>>>>> wrote: >>>>>>>> Hi, >>>>>>>> forget the whole list of errors and just resolve the DB >>>>>>>> connectivity >>>>>>>> between >>>>>>>> the Kamailio server and DB server first . >>>>>>>> >>>>>>>>> 27(24762) ERROR: db_mysql [km_my_con.c:109]: driver error: Can't >>>>>>>>> connect to MySQL server on 'xxxxxxxxx' (4) >>>>>>>> >>>>>>>> try connecting to the remote DB server 'xxxxxxxxx' from linux >>>>>>>> shell >>>>>>>> i.e >>>>>>>> >>>>>>>> # mysql -u<user> -p<passwd> -h 'xxxxxxxxx' >>>>>>>> >>>>>>>> Regards, >>>>>>>> Sammy >>>>>>>> >>>>>>>> >>>>>>>> On Fri, Dec 30, 2011 at 3:33 PM, Ali Jawad&lt;ali.jawad(a)splendor.net&gt; >>>>>>>> wrote: >>>>>>>>> Hi All >>>>>>>>> I have tried the below with Kamailio 3.1.0 and 3.2.1. the problem >>>>>>>>> is >>>>>>>>> that Kamailio at times fails to start up for no obvious reasons, >>>>>>>>> I.e. >>>>>>>>> in 10 restarts Kamailio might fail to start 3,0 or 5 times. Te >>>>>>>>> debug >>>>>>>>> log "level 2 " shows the following : >>>>>>>>> >>>>>>>>> 27(24762) ERROR: db_mysql [km_my_con.c:109]: driver error: Can't >>>>>>>>> connect to MySQL server on 'xxxxxxxxx' (4) >>>>>>>>> 27(24762) ERROR:<core> [db.c:303]: could not add connection >>>>>>>>> to >>>>>>>>> the >>>>>>>>> pool27(24762) ERROR: group [group.c:211]: unable to connect to >>>>>>>>> the >>>>>>>>> database >>>>>>>>> 27(24762) ERROR:<core> [sr_module.c:889]: init_mod_child(): >>>>>>>>> Error >>>>>>>>> while initializing module group >>>>>>>>> (/usr/local/kamailio/lib/kamailio/modules_k/group.so) >>>>>>>>> 27(24762) ERROR:<core> [pt.c:481]: ERROR: >>>>>>>>> fork_tcp_process(): >>>>>>>>> init_child failed for process 27, pid 24762, "tcp receiver >>>>>>>>> child=1" >>>>>>>>> >>>>>>>>> and then >>>>>>>>> >>>>>>>>> >>>>>>>>> 30(24765) :<core> [pass_fd.c:293]: ERROR: receive_fd: EOF on >>>>>>>>> 45 >>>>>>>>> 0(24735) ALERT:<core> [main.c:748]: child process 24762 >>>>>>>>> exited >>>>>>>>> normally, status=255 >>>>>>>>> 0(24735) INFO:<core> [main.c:766]: INFO: terminating due to >>>>>>>>> SIGCHLD >>>>>>>>> >>>>>>>>> The problem happens on 4 different servers, I did try to compile >>>>>>>>> more >>>>>>>>> than once, the servers are 32 Bit CentOS 5.6. The connection to >>>>>>>>> the >>>>>>>>> database is monitored and there are no issues with connecting to >>>>>>>>> the >>>>>>>>> DB "it works at times and times not for Kamailio so a user/pwd >>>>>>>>> issue >>>>>>>>> is not likely to cause this, manual cnnect worked", config file >>>>>>>>> errors >>>>>>>>> are not found. >>>>>>>>> >>>>>>>>> I did also check max no of connections on MySQL server which is >>>>>>>>> set >>>>>>>>> to >>>>>>>>> 500 on the server and only 100 cons are used. The group module >>>>>>>>> uses >>>>>>>>> the same connection string as other modules which is predefined >>>>>>>>> and >>>>>>>>> there are other modules that access the db before the group >>>>>>>>> module >>>>>>>>> and >>>>>>>>> those do not have a problem. >>>>>>>>> >>>>>>>>> Please advice. >>>>>>>>> >>>>>>>>> Regards >>>>>>>>> >>>>>>>>> _______________________________________________ >>>>>>>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users >>>>>>>>> mailing >>>>>>>>> list >>>>>>>>> sr-users(a)lists.sip-router.org >>>>>>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users >>>>>>>> >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing >>>>>>>> list >>>>>>>> sr-users(a)lists.sip-router.org >>>>>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users >>>>>>>> >>>>>>> -- >>>>>>> Ali Jawad >>>>>>> Information Systems Manager >>>>>>> Splendor Telecom (www.splendor.net) >>>>>>> Beirut, Lebanon >>>>>>> Phone: +9611373725/ext 116 >>>>>>> FAX: +9611375554 >>>>>>> >>>>>>> _______________________________________________ >>>>>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing >>>>>>> list >>>>>>> sr-users(a)lists.sip-router.org >>>>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing >>>>>> list >>>>>> sr-users(a)lists.sip-router.org >>>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users >>>>>> >>>>>> >>>>>> -- >>>>>> Daniel-Constantin Mierla -- http://www.asipto.com >>>>>> http://linkedin.com/in/miconda -- http://twitter.com/miconda >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing >>>>>> list >>>>>> sr-users(a)lists.sip-router.org >>>>>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users >>>>>> >>>> -- >>>> Daniel-Constantin Mierla -- http://www.asipto.com >>>> http://linkedin.com/in/miconda -- http://twitter.com/miconda >>>> >> -- >> Daniel-Constantin Mierla -- http://www.asipto.com >> http://linkedin.com/in/miconda -- http://twitter.com/miconda >> >

Hi, forget the whole list of errors and just resolve the DB connectivity between the Kamailio server and DB server first . try connecting to the remote DB server 'xxxxxxxxx' from linux shell i.e # mysql -u<user> -p<passwd> -h 'xxxxxxxxx' Regards, Sammy On Fri, Dec 30, 2011 at 3:33 PM, Ali Jawad &lt;ali.jawad(a)splendor.net&gt; wrote: > > Hi All > I have tried the below with Kamailio 3.1.0 and 3.2.1. the problem is > that Kamailio at times fails to start up for no obvious reasons, I.e. > in 10 restarts Kamailio might fail to start 3,0 or 5 times. Te debug > log "level 2 " shows the following : > > 27(24762) ERROR: <core> [db.c:303]: could not add connection to the > pool27(24762) ERROR: group [group.c:211]: unable to connect to the > database > 27(24762) ERROR: <core> [sr_module.c:889]: init_mod_child(): Error > while initializing module group > (/usr/local/kamailio/lib/kamailio/modules_k/group.so) > 27(24762) ERROR: <core> [pt.c:481]: ERROR: fork_tcp_process(): > init_child failed for process 27, pid 24762, "tcp receiver child=1" > > and then > > > 30(24765) : <core> [pass_fd.c:293]: ERROR: receive_fd: EOF on 45 >  0(24735) ALERT: <core> [main.c:748]: child process 24762 exited > normally, status=255 >  0(24735) INFO: <core> [main.c:766]: INFO: terminating due to SIGCHLD > > The problem happens on 4 different servers, I did try to compile more > than once, the servers are 32 Bit CentOS 5.6. The connection to the > database is monitored and there are no issues with connecting to the > DB "it works at times and times not for Kamailio so a user/pwd issue > is not likely to cause this, manual cnnect worked", config file errors > are not found. > > I did also check max no of connections on MySQL server which is set to > 500 on the server and only 100 cons are used. The group module uses > the same connection string as other modules  which is predefined  and > there are other modules that access the db before the group module and > those do not have a problem. > > Please advice. > > Regards > > _______________________________________________ > SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list > sr-users(a)lists.sip-router.org > http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users