Filebeats getsockopt: connection refused

mkorayem · April 20, 2017, 11:04am

Hi,

I have an ELK setup which is working find for all filebeats, winlogbeats and other inputs

But on one server

Linux SERVERNAME 2.6.18-164.11.1.el5 #1 SMP Wed Jan 20 07:39:04 EST 2010 i686 i686 i386 GNU/Linux

I downloaded the binary

filebeat-freebsd-386
https://beats-nightlies.s3.amazonaws.com/index.html?prefix=jenkins/filebeat/1323-510c83ceb43508b012efb67a1305bca1010aad13/

This is the error message I get

2017/04/20 10:53:25.833903 spooler.go:88: DBG Flushing spooler because of timeout. Events flushed: 0
2017/04/20 10:53:27.838761 sync.go:53: DBG connect
2017/04/20 10:53:27.839305 single.go:140: ERR Connecting error publishing events (retrying): dial tcp 192.168.10.237:5044: getsockopt: connection refused
2017/04/20 10:53:27.839319 single.go:156: DBG send fail

steffens · April 21, 2017, 9:01am

is filebeat pushing to logstash or elasticsearch?

Is address 192.168.10.237:5044 reachable from this single machine?

how come you have a linux server, but use a freebsd binary from nightly builds?

mkorayem · April 22, 2017, 12:53pm

Hi

Yes it is reachable and I even tried telnet with port 5044 and it works find

Sorry I mistakenly put the Freebsd name, it is a Linux and I used the binary

filebeat-linux-386

Linux SERVERNAME 2.6.18-164.11.1.el5 #1 SMP Wed Jan 20 07:39:04 EST 2010 i686 i686 i386 GNU/Linux

steffens · April 24, 2017, 9:04am

Hmm.... connection is normally refused if no process is serving the port or some firewall.

Did this error occur only once, or is filebeat printing the error every few seconds? Filebeat tries to reconnect with expoential backoff (default max = 1minute).

I guess you did run telnet from the machine having this error? If so, after restarting filebeat, does this error preserve?

Having a trace (tcpdump) might help figuring out why the connection attempt has not been accepted.

mkorayem · April 24, 2017, 9:39am

Hi Steffens

The error occurs each time I run the filebeat manually and it is repeated

2017/04/24 09:28:53.480521 log_file.go:84: DBG End of file reached: /var/log/messages; Backoff now.
2017/04/24 09:28:53.492880 spooler.go:88: DBG Flushing spooler because of timeout. Events flushed: 0
2017/04/24 09:28:58.474975 log_file.go:84: DBG End of file reached: /var/log/secure.1; Backoff now.
2017/04/24 09:28:58.475012 log_file.go:84: DBG End of file reached: /var/log/secure; Backoff now.
2017/04/24 09:28:58.475063 log_file.go:84: DBG End of file reached: /var/log/messages.1; Backoff now.
2017/04/24 09:28:58.493962 spooler.go:88: DBG Flushing spooler because of timeout. Events flushed: 0
2017/04/24 09:29:01.551592 sync.go:53: DBG connect
2017/04/24 09:29:01.552068 single.go:140: ERR Connecting error publishing events (retrying): dial tcp 192.168.10.237:5044: getsockopt: connection refused
2017/04/24 09:29:01.552614 single.go:156: DBG send fail
2017/04/24 09:29:03.482003 log_file.go:84: DBG End of file reached: /var/log/messages; Backoff now.
2017/04/24 09:29:03.482023 prospector.go:197: DBG Run prospector
2017/04/24 09:29:03.482033 prospector_log.go:73: DBG Start next scan

Also I made a tcpdump trace on the elk machine and it received 0 bits from this server

root@elk:~# tcpdump src host 192.168.10.199 and port 5044
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes

And a tcpdump on the sender server

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
11:32:28.997490 IP 192.168.10.199.47155 > 192.168.10.237.lxi-evntsvc: S 4202664451:4202664451(0) win 5840 <mss 1460,sackOK,timestamp 448758197 0,nop,wscale 7>
11:32:29.999713 IP 192.168.10.199.47156 > 192.168.10.237.lxi-evntsvc: S 4209729800:4209729800(0) win 5840 <mss 1460,sackOK,timestamp 448759199 0,nop,wscale 7>
11:32:32.001726 IP 192.168.10.199.47157 > 192.168.10.237.lxi-evntsvc: S 4202283528:4202283528(0) win 5840 <mss 1460,sackOK,timestamp 448761201 0,nop,wscale 7>
11:32:36.003808 IP 192.168.10.199.47158 > 192.168.10.237.lxi-evntsvc: S 4215919907:4215919907(0) win 5840 <mss 1460,sackOK,timestamp 448765203 0,nop,wscale 7>
11:32:44.005915 IP 192.168.10.199.50387 > 192.168.10.237.lxi-evntsvc: S 4239114558:4239114558(0) win 5840 <mss 1460,sackOK,timestamp 448773205 0,nop,wscale 7>

This is after manually starting the filebeat

[ServerName ~]# /root/admin/filebeat-linux-386 -c /etc/filebeat/filebeat.yml -e -d ''
2017/04/24 09:32:23.930961 beat.go:327: INFO Home path: [/root/admin] Config path: [/root/admin] Data path: [/root/admin/data] Logs path: [/root/admin/logs]
2017/04/24 09:32:23.930990 beat.go:352: INFO Beat metadata path: /root/admin/data/meta.json
2017/04/24 09:32:23.931068 beat.go:334: INFO Beat UUID: 5ad83c6d-6972-458c-8fc0-934e9be0976c
2017/04/24 09:32:23.931083 beat.go:212: INFO Setup Beat: filebeat; Version: 6.0.0-alpha1-gite288cf6
2017/04/24 09:32:23.931094 processor.go:44: DBG Processors:
2017/04/24 09:32:23.931108 beat.go:218: DBG Initializing output plugins
2017/04/24 09:32:23.931177 logstash.go:92: INFO Max Retries set to: 3
2017/04/24 09:32:23.931237 outputs.go:107: INFO Activated logstash as output plugin.
2017/04/24 09:32:23.931249 publish.go:158: DBG Create output worker
2017/04/24 09:32:23.931289 publish.go:191: INFO Publisher name: ServerName
2017/04/24 09:32:23.931402 async.go:63: INFO Flush Interval set to: 1s
2017/04/24 09:32:23.931415 async.go:64: INFO Max Bulk Size set to: 2048
2017/04/24 09:32:23.931424 async.go:72: DBG create bulk processing worker (interval=1s, bulk size=2048)
2017/04/24 09:32:23.931501 modules.go:93: ERR Not loading modules. Module directory not found: /root/admin/module
2017/04/24 09:32:23.931615 metrics.go:23: INFO Metrics logging every 30s
2017/04/24 09:32:23.931726 beat.go:255: INFO filebeat start running.
2017/04/24 09:32:23.931819 registrar.go:83: INFO Registry file set to: /root/admin/data/registry
2017/04/24 09:32:23.931898 registrar.go:104: INFO Loading registrar data from /root/admin/data/registry
2017/04/24 09:32:23.932169 registrar.go:115: INFO States Loaded from registrar: 10
2017/04/24 09:32:23.932231 crawler.go:38: INFO Loading Prospectors: 1
2017/04/24 09:32:23.932392 processor.go:44: DBG Processors:
2017/04/24 09:32:23.932453 prospector.go:96: DBG File Configs: [/var/log/secure /var/log/messages*]
2017/04/24 09:32:23.932520 prospector_log.go:46: DBG exclude_files:
2017/04/24 09:32:23.932594 state.go:64: DBG New state added for /var/log/secure.1
2017/04/24 09:32:23.932667 state.go:64: DBG New state added for /var/log/secure.2
2017/04/24 09:32:23.932723 state.go:64: DBG New state added for /var/log/messages.3
2017/04/24 09:32:23.932793 state.go:64: DBG New state added for /var/log/messages.4
2017/04/24 09:32:23.932848 state.go:64: DBG New state added for /var/log/messages.2
2017/04/24 09:32:23.932909 state.go:64: DBG New state added for /var/log/secure
2017/04/24 09:32:23.932968 state.go:64: DBG New state added for /var/log/secure.3
2017/04/24 09:32:23.933028 state.go:64: DBG New state added for /var/log/secure.4
2017/04/24 09:32:23.933086 state.go:64: DBG New state added for /var/log/messages
2017/04/24 09:32:23.933144 state.go:64: DBG New state added for /var/log/messages.1
2017/04/24 09:32:23.933196 prospector_log.go:67: INFO Prospector with previous states loaded: 10
2017/04/24 09:32:23.933303 prospector.go:138: INFO Starting prospector of type: log; id: 11581658867755187697
2017/04/24 09:32:23.933392 crawler.go:58: INFO Loading and starting Prospectors completed. Enabled prospectors: 1
2017/04/24 09:32:23.933455 spooler.go:63: INFO Starting spooler: spool_size: 2048; idle_timeout: 5s
2017/04/24 09:32:23.932627 registrar.go:148: INFO Starting Registrar
2017/04/24 09:32:23.932631 sync.go:41: INFO Start sending events to output
2017/04/24 09:32:23.933600 prospector_log.go:73: DBG Start next scan

And this is the configuration

###################### Filebeat Configuration Example #########################
#=========================== Filebeat prospectors =============================
filebeat.prospectors:

input_type: log

Paths that should be crawled and fetched. Glob based paths.

paths:
- /var/log/secure*
- /var/log/messages*
document_type: syslog
#================================ Outputs =====================================
#----------------------------- Logstash output --------------------------------
output.logstash:

The Logstash hosts

hosts: ["192.168.10.237:5044"]
index: 'filebeat'

logging.level: debug
logging.to_files: true
logging.to_syslog: false
logging.files:
path: /var/log/filebeat
name: filebeat.log
keepfiles: 7

steffens · April 24, 2017, 12:21pm

Please use the </> button or 3 back-ticks to format config files and logs. The > character you used stands for "quote text" and will still incorrectly format the content.

You can have tcpdump write the trace to a file and have a more detailed look in wireshark. I guess that's 5 connection attempts, but I see no response (I'd assume an ICMP response at least).

It's interesting you don't see a connection attempt on the server though. Some kind of firewall/NAT device in between?

Maybe you can have tcpdump write a pcap file for inspection, for filebeat and telnet. Maybe there is a difference.

mkorayem · April 24, 2017, 1:49pm

Thanks Steffens,

I was searching for this :slight_smile:

I tcpdumped all communication between the two servers ELK and the other

tcpdump for ELK and other server

Please check if you can see something I don't

I tried ping, telnet and filebeat

It seems that ping and telnet pass through while filebeat was not able to send anything on the first place

I am suspecting compilation compatiblity

This is log of filebeat
> 2017-04-20T12:50:27+02:00 DBG Disable stderr logging
> 2017-04-20T12:50:27+02:00 INFO Home path: [/root/admin] Config path: [/root/admin] Data path: [/root/admin/data] Logs path: [/root/admin/logs]
> 2017-04-20T12:50:27+02:00 INFO Beat metadata path: /root/admin/data/meta.json
> 2017-04-20T12:50:27+02:00 INFO Beat UUID: 5ad83c6d-6972-458c-8fc0-934e9be0976c
> 2017-04-20T12:50:27+02:00 INFO Setup Beat: filebeat; Version: 6.0.0-alpha1-gite288cf6
> 2017-04-20T12:50:27+02:00 DBG Processors:
> 2017-04-20T12:50:27+02:00 DBG Initializing output plugins
> 2017-04-20T12:50:27+02:00 INFO Max Retries set to: 3
> 2017-04-20T12:50:27+02:00 INFO Activated logstash as output plugin.
> 2017-04-20T12:50:27+02:00 DBG Create output worker
> 2017-04-20T12:50:27+02:00 INFO Publisher name: pbx.eg.si-vision.com
> 2017-04-20T12:50:27+02:00 INFO Flush Interval set to: 1s
> 2017-04-20T12:50:27+02:00 INFO Max Bulk Size set to: 2048
> 2017-04-20T12:50:27+02:00 DBG create bulk processing worker (interval=1s, bulk size=2048)
> 2017-04-20T12:50:27+02:00 ERR Not loading modules. Module directory not found: /root/admin/module

mkorayem · April 24, 2017, 8:25pm

Hi,

It seems that the Go does not support kernels before 2.6.23

I have this

Linux SERVER 2.6.18-164.11.1.el5 #1 SMP Wed Jan 20 07:39:04 EST 2010 i686 i686 i386 GNU/Linux

steffens · April 25, 2017, 11:25am

yeah, might be a kernel problem. We normally compile a static filebeat binary without cgo support. Maybe you can try to compile filebeat on this system and see if this works.

system · May 23, 2017, 11:31am

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Filebeats getsockopt: connection refused

Paths that should be crawled and fetched. Glob based paths.

The Logstash hosts

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