[syslog-ng] Syslog-ng shipping logs through AMQP with huge memory leaks
Nagy, Gábor
gabor.nagy at balabit.com
Mon Mar 19 16:09:47 UTC 2018
Hello Michal!
We looked into your problem, unfortunately we were unable to reproduce the
reported memleak so far.
I would like to ask you a couple of questions:
- have you built syslog-ng from source or you downloaded a package?
- have you tried to reproduce the issue in a different environment with a
minimal config? We are using your configuration, but if you narrowed down
the problem it would be helpful.
- we were experimenting with a very simple JSON message, can you show us an
example log to see the complexity of it, please? We are thinking to check
Bro out for log message structure.
I saw that you have gave a huge log-fetch-limit() in the global config
compared to the default. Setting log-fetch-limit() in global config is
deprecated, you need to set it up per source.
We have a couple of ideas and will continue to try reproducing the memleak
you reported.
Regards,
Gabor
On Sat, Mar 17, 2018 at 12:45 AM, Michal Purzynski <michal at mozilla.com>
wrote:
> Hello!!
>
> Could you help us troubleshoot a memory leak or a misconfiguration that
> makes the syslog-ng process memory usage grow? Like, a lot.
>
> We use syslog-ng to read some JSON files and ship them to a RabbitMQ
> server via AMQP. As you can see, this is just a client, it does not accept
> connections from other systems, it works mostly with Bro logs (plus it
> handles a local syslog because that's convenient).
>
> We have around 6000 events per second on this server. What's interesting,
> syslog-ng's memory grows quickly without flow control (and slower, but it
> still continues to grow with it). I'll switch that to TLS soon, a more
> secure configuration is ready to be deployed.
>
> Things look pretty good on the RabbitMQ side. That server is not under
> pressure and handles the load just fine, the queue is consumed, there's
> nothing building up that would make me believe we have RabbitMQ server
> overloaded.
>
> How much does syslog-ng grow?
>
> I'd say - if I disable flow-control it will eat 55GB of RAM in less than
> 24h, if not faster. With flow-control enabled on the most 'busy' files
> things are way better, but the memory usage still keep growing -
>
> syslog-ng.conf looks like below - BTW that's Ubuntu 14.04 LTS, 3.14.1-3 of
> syslog-ng
>
> Let me know what other data you might need.
>
> @version: 3.14
> @include "scl.conf"
>
> # Syslog-ng configuration file, compatible with default Debian syslogd
> # installation.
>
> # First, set some global options.
> options {
> threaded (yes);
> flush_lines (50000);
> flush_timeout (1000);
> time_reopen (10);
> log_fetch_limit (50000);
> log_fifo_size (500000);
> use_dns (yes);
> dns_cache (5000);
> dns_cache_expire(87600);
> use_fqdn (yes);
> owner("root");
> group("adm");
> perm(0640);
> keep_hostname (yes);
> chain_hostnames (off);
> };
>
> ########################
> # Sources
> ########################
> # This is the default behavior of sysklogd package
> # Logs may come from unix stream, but not from another machine.
> #
> source s_src {
> system();
> internal();
> };
>
> # If you wish to get logs from remote machine you should uncomment
> # this and comment the above source line.
> #
> #source s_net { tcp(ip(127.0.0.1) port(1000)); };
>
> ########################
> # Destinations
> ########################
> # First some standard logfile
> #
> destination d_auth { file("/var/log/auth.log"); };
> destination d_cron { file("/var/log/cron.log"); };
> destination d_daemon { file("/var/log/daemon.log"); };
> destination d_kern { file("/var/log/kern.log"); };
> destination d_mail { file("/var/log/mail.log"); };
> destination d_syslog { file("/var/log/syslog"); };
>
> # This files are the log come from the mail subsystem.
> #
> #destination d_mailinfo { file("/var/log/mail.info"); };
> #destination d_mailwarn { file("/var/log/mail.warn"); };
> #destination d_mailerr { file("/var/log/mail.err"); };
>
> # Logging for INN news system
> #
> #destination d_newscrit { file("/var/log/news/news.crit"); };
> #destination d_newserr { file("/var/log/news/news.err"); };
> #destination d_newsnotice { file("/var/log/news/news.notice"); };
>
> # Some 'catch-all' logfiles.
> #
> destination d_debug { file("/var/log/debug"); };
> destination d_error { file("/var/log/error"); };
>
> # Syslog1 in SCL3
> destination d_scl3 {
> udp("syslog1.private.scl3.mozilla.com" port(514));
> };
>
> ########################
> # Filters
> ########################
> # Here's come the filter options. With this rules, we can set which
> # message go where.
>
> filter f_dbg { level(debug); };
> filter f_info { level(info); };
> filter f_notice { level(notice); };
> filter f_warn { level(warn); };
> filter f_err { level(err); };
> filter f_crit { level(crit .. emerg); };
> filter f_debug { level(debug) and not facility(auth, authpriv, news,
> mail); };
> filter f_error { level(err .. emerg) ; };
> filter f_auth { facility(auth, authpriv) and not filter(f_debug); };
> filter f_cron { facility(cron) and not filter(f_debug); };
> filter f_daemon { facility(daemon) and not filter(f_debug); };
> filter f_kern { facility(kern) and not filter(f_debug); };
> filter f_local { facility(local0, local1, local3, local4, local5,
> local6, local7) and not filter(f_debug); };
> filter f_mail { facility(mail) and not filter(f_debug); };
> filter f_syslog3 { not facility(auth, authpriv, mail) and not
> filter(f_debug); };
>
> ########################
> # Log paths
> ########################
> log { source(s_src); filter(f_auth); destination(d_auth); };
> log { source(s_src); filter(f_cron); destination(d_cron); };
> log { source(s_src); filter(f_daemon); destination(d_daemon); };
> log { source(s_src); filter(f_kern); destination(d_kern); };
> log { source(s_src); filter(f_syslog3); destination(d_syslog); };
> log { source(s_src); filter(f_mail); destination(d_mail); };
> log { source(s_src); filter(f_debug); destination(d_debug); };
> log { source(s_src); filter(f_error); destination(d_error); };
>
>
> # All messages send to a remote site
> #
> log { source(s_src); destination(d_scl3); };
>
> ###
> # Include all config files in /etc/syslog-ng/conf.d/
> ###
> @include "/etc/syslog-ng/conf.d/*.conf"
>
>
>
> There's another file, amqp.conf where we actually read and ship those Bro
> logs.
>
>
> source bro_conn {
> file( "/nsm/bro/logs/current/conn.log" flags(no-parse));
> };
>
> source bro_ssl {
> file( "/nsm/bro/logs/current/ssl.log" flags(no-parse));
> };
>
> source bro_dns {
> file( "/nsm/bro/logs/current/dns.log" flags(no-parse));
> };
>
> source bro_smtp {
> file( "/nsm/bro/logs/current/smtp.log" flags(no-parse));
> };
>
> source bro_ssh {
> file( "/nsm/bro/logs/current/ssh.log" flags(no-parse));
> };
>
> source bro_notice {
> file( "/nsm/bro/logs/current/notice.log" flags(no-parse));
> };
>
> source bro_intel {
> file( "/nsm/bro/logs/current/intel.log" flags(no-parse));
> };
>
> source bro_dce_rpc {
> file( "/nsm/bro/logs/current/dce_rpc.log" flags(no-parse));
> };
>
> source bro_dhcp {
> file( "/nsm/bro/logs/current/dhcp.log" flags(no-parse));
> };
>
> source bro_files {
> file( "/nsm/bro/logs/current/files.log" flags(no-parse));
> };
>
> source bro_kerberos {
> file( "/nsm/bro/logs/current/kerberos.log" flags(no-parse));
> };
>
> source bro_http {
> file( "/nsm/bro/logs/current/http.log" flags(no-parse));
> };
>
> source bro_software {
> file( "/nsm/bro/logs/current/software.log" flags(no-parse));
> };
>
> source bro_snmp {
> file( "/nsm/bro/logs/current/snmp.log" flags(no-parse));
> };
>
> source bro_socks {
> file( "/nsm/bro/logs/current/socks.log" flags(no-parse));
> };
>
> source bro_tunnel {
> file( "/nsm/bro/logs/current/tunnel.log" flags(no-parse));
> };
>
> source bro_ntlm {
> file( "/nsm/bro/logs/current/ntlm.log" flags(no-parse));
> };
>
> source bro_pe {
> file( "/nsm/bro/logs/current/pe.log" flags(no-parse));
> };
>
> source bro_sip {
> file( "/nsm/bro/logs/current/sip.log" flags(no-parse));
> };
>
> source bro_smb_files {
> file( "/nsm/bro/logs/current/smb_files.log" flags(no-parse));
> };
>
> source bro_smb_mapping {
> file( "/nsm/bro/logs/current/smb_mapping.log" flags(no-parse));
> };
>
> source bro_x509 {
> file( "/nsm/bro/logs/current/x509.log" flags(no-parse));
> };
>
> source bro_known_certs {
> file( "/nsm/bro/logs/current/known_certs.log" flags(no-parse));
> };
>
> source bro_known_devices {
> file( "/nsm/bro/logs/current/known_devices.log" flags(no-parse));
> };
>
> source bro_known_hosts {
> file( "/nsm/bro/logs/current/known_hosts.log" flags(no-parse));
> };
>
> source bro_known_services {
> file( "/nsm/bro/logs/current/known_services.log" flags(no-parse));
> };
>
>
> destination d_amqp {
> amqp(
> vhost("nsm")
> host("<our happy rabbit>
> <http://syslog-proxy1.dmz.mdc1.mozilla.com>")
> port(5672)
> exchange("eventtask")
> exchange-type("direct")
> routing-key("eventtask")
> body("$(format-json --scope nv_pairs --pair category=\"bro\"
> --pair source=$source --pair customendpoint=\" \" --pair tags=\"bro\")")
> persistent(yes)
> username("USERNAME")
> password("PASSWORD")
> );
> };
>
>
> parser p_json { json-parser(); };
>
>
> log { source(bro_conn); parser(p_json); destination(d_amqp); };
> log { source(bro_http); parser(p_json); destination(d_amqp); };
> log { source(bro_ssl); parser(p_json); destination(d_amqp); };
> log { source(bro_dns); parser(p_json); destination(d_amqp); };
> log { source(bro_smtp); parser(p_json); destination(d_amqp); };
> log { source(bro_ssh); parser(p_json); destination(d_amqp); };
> log { source(bro_intel); parser(p_json); destination(d_amqp); };
> log { source(bro_notice); parser(p_json); destination(d_amqp); };
> log { source(bro_dce_rpc); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_dhcp); parser(p_json); destination(d_amqp); };
> log { source(bro_files); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_kerberos); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_software); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_snmp); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_socks); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_tunnel); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_ntlm); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_pe); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_sip); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_smb_files); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_smb_mapping); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_x509); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_known_certs); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_known_devices); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_known_hosts); parser(p_json); destination(d_amqp);
> flags(flow-control); };
> log { source(bro_known_services); parser(p_json); destination(d_amqp);
> flags(flow-control); };
>
>
>
>
>
> *Statistics*
>
>
> Mar 15 *00:17:30* nsmserver syslog-ng[11278]: Log statistics;
> processed='source(bro_conn)=112360513', processed='source(s_src)=227349',
> processed='source(bro_known_devices)=3791', processed='global(sdata_updates)=0',
> processed='center(received)=310790955', processed='source(bro_ssh)=622441',
> processed='source(bro_smb_files)=5815964', processed='source(bro_socks)=0',
> processed='destination(d_daemon)=21', dropped='dst.amqp(d_amqp#0,amq
> p,nsm,happyrabbit,5672,eventtask,direct)=2',
> processed='dst.amqp(d_amqp#0,amqp,nsm,happyrabbit,5672,eventtask,direct)=310563565',
> queued='dst.amqp(d_amqp#0,amqp,nsm,happyrabbit,5672,eventtask,direct)=0',
> processed='destination(d_error)=189386', processed='destination(d_syslog)=207595',
> processed='source(bro_ssl)=49788364', processed='source(bro_kerberos)=133177',
> processed='source(bro_dhcp)=69970', processed='destination(d_mail)=0',
> processed='source(bro_http)=60085539', processed='global(msg_clones)=1576',
> processed='destination(d_amqp)=310563565', processed='destination(d_kern)=146',
> processed='source(bro_tunnel)=520921', processed='source(bro_software)=18851236',
> processed='source(bro_known_services)=13403',
> processed='source(bro_known_certs)=2070', processed='source(bro_dce_rpc)=501875',
> processed='destination(d_scl3)=227349', processed='source(bro_known_hosts)=14604',
> processed='source(bro_smb_mapping)=116412', processed='source(bro_files)=15152100',
> processed='center(queued)=311210449', processed='destination(d_debug)=10280',
> processed='src.internal(s_src#2)=26785', stamp='src.internal(s_src#2)=1521073048',
> processed='source(bro_ntlm)=16823', processed='destination(d_auth)=9474',
> processed='global(internal_queue_length)=0',
> processed='source(bro_smtp)=1067448', dropped='dst.udp(d_scl3#0,udp,
> syslog1.private.scl3.mozilla.com:514)=0', processed='dst.udp(d_scl3#0,ud
> p,syslog1.private.scl3.mozilla.com:514)=227349',
> queued='dst.udp(d_scl3#0,udp,syslog1.private.scl3.mozilla.com:514)=221705',
> written='dst.udp(d_scl3#0,udp,syslog1.private.scl3.mozilla.com:514)=5644',
> processed='global(payload_reallocs)=310467149',
> queued='global(scratch_buffers_count)=17875655781170',
> processed='destination(d_cron)=2633', processed='source(bro_snmp)=9854568',
> processed='source(bro_notice)=119415', processed='source(bro_dns)=19303431',
> processed='source(bro_sip)=97822', processed='source(bro_intel)=26969',
> processed='source(bro_pe)=531103', processed='source(bro_x509)=15493647',
> queued='global(scratch_buffers_bytes)=2304'
>
>
> Mar 15 *00:27:30* nsmserver <http://nsmserver1.private.scl3.mozilla.com>
> syslog-ng[11278]: Log statistics; processed='source(bro_conn)=112988941',
> processed='source(s_src)=228651', processed='source(bro_known_devices)=3791',
> processed='global(sdata_updates)=0', processed='center(received)=312659144',
> processed='source(bro_ssh)=627013', processed='source(bro_smb_files)=5863697',
> processed='source(bro_socks)=0', processed='destination(d_daemon)=21',
> dropped='dst.amqp(d_amqp#0,amqp,nsm,happyrabbit
> <http://syslog-proxy1.dmz.mdc1.mozilla.com>,5672,eventtask,direct)=2',
> processed='dst.amqp(d_amqp#0,amqp,nsm,happyrabbit
> <http://syslog-proxy1.dmz.mdc1.mozilla.com>,5672,eventtask,direct)=312430452',
> queued='dst.amqp(d_amqp#0,amqp,nsm,happyrabbit
> <http://syslog-proxy1.dmz.mdc1.mozilla.com>,5672,eventtask,direct)=0',
> processed='destination(d_error)=190429', processed='destination(d_syslog)=208759',
> processed='source(bro_ssl)=50077572', processed='source(bro_kerberos)=134215',
> processed='source(bro_dhcp)=70487', processed='destination(d_mail)=0',
> processed='source(bro_http)=60446166', processed='global(msg_clones)=1594',
> processed='destination(d_amqp)=312430452', processed='destination(d_kern)=146',
> processed='source(bro_tunnel)=524450', processed='source(bro_software)=18938552',
> processed='source(bro_known_services)=13532',
> processed='source(bro_known_certs)=2073', processed='source(bro_dce_rpc)=505206',
> processed='destination(d_scl3)=228651', processed='source(bro_known_hosts)=14630',
> processed='source(bro_smb_mapping)=117177', processed='source(bro_files)=15252368',
> processed='center(queued)=313080999', processed='destination(d_debug)=10352',
> processed='src.internal(s_src#2)=26966', stamp='src.internal(s_src#2)=1521073648',
> processed='source(bro_ntlm)=16848', processed='destination(d_auth)=9540',
> processed='global(internal_queue_length)=0',
> processed='source(bro_smtp)=1074012', dropped='dst.udp(d_scl3#0,udp,
> syslog1.private.scl3.mozilla.com:514)=0', processed='dst.udp(d_scl3#0,ud
> p,syslog1.private.scl3.mozilla.com:514)=228651',
> queued='dst.udp(d_scl3#0,udp,syslog1.private.scl3.mozilla.com:514)=223007',
> written='dst.udp(d_scl3#0,udp,syslog1.private.scl3.mozilla.com:514)=5644',
> processed='global(payload_reallocs)=312333723',
> queued='global(scratch_buffers_count)=17970145061685',
> processed='destination(d_cron)=2649', processed='source(bro_snmp)=9917302',
> processed='source(bro_notice)=120140', processed='source(bro_dns)=19462256',
> processed='source(bro_sip)=98565', processed='source(bro_intel)=27061',
> processed='source(bro_pe)=535753', processed='source(bro_x509)=15598686',
> queued='global(scratch_buffers_bytes)=2304'
>
>
> ____________________________________________________________
> __________________
> Member info: https://lists.balabit.hu/mailman/listinfo/syslog-ng
> Documentation: http://www.balabit.com/support/documentation/?
> product=syslog-ng
> FAQ: http://www.balabit.com/wiki/syslog-ng-faq
>
>
>
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