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  1. ZABBIX BUGS AND ISSUES
  2. ZBX-16374

Zabbix trapper processes possible hangup

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    Details

    • Type: Incident report
    • Status: Closed
    • Priority: Trivial
    • Resolution: Incomplete
    • Affects Version/s: 4.2.3
    • Fix Version/s: None
    • Component/s: Server (S)
    • Labels:
    • Environment:
      Zabbix Server (RHEL 7.6), AWS EC2 c4.xlarge
      Zabbix frontend (RHEL 7.6), AWS EC2 m4.large
      Zabbix DB: AWS RDS (MariaDB 10.0.24), db.m4.xlarge

      Description

      Server info:

      Incident details:

      1. Zabbix server trapper busy processes increased significantly from its typical value (~1-3%) to 100%.
      1. Zabbix proxies cannot connect to Zabbix server. Zabbix_proxy.log contains the following lines:
      10957:20190714:052308.169 received configuration data from server at "*******", datalen 426293
       10958:20190714:052602.513 cannot send heartbeat message to server at "*******": ZBX_TCP_READ() timed out
       10958:20190714:052702.517 cannot send heartbeat message to server at "*******": ZBX_TCP_READ() timed out
       10958:20190714:052802.520 cannot send heartbeat message to server at "*******": ZBX_TCP_READ() timed out
       10958:20190714:052902.523 cannot send heartbeat message to server at "*******": ZBX_TCP_READ() timed out
       10958:20190714:053002.526 cannot send heartbeat message to server at "*******": ZBX_TCP_READ() timed out
       10958:20190714:053102.529 cannot send heartbeat message to server at "*******": ZBX_TCP_READ() timed out
      

       Agents that are monitored by Zabbix server itself stay green and data is being collected. Zabbix server logs contains no suspicious records, just info about items that became unsupported.

      The environment stays in that condition for several hours and Zabbix server starts receiving data from Zabbix proxies only after a reboot via

      # systemctl restart zabbix-server

      Proxy log:

      10959:20190715:061449.816 Unable to connect to the server [******************]:10051 [cannot connect to [[******************]:10051]: [111] Connection refused]. Will retry every 1 second(s)
       10959:20190715:061455.824 Connection restored.
       10957:20190715:061824.192 received configuration data from server at "******************", datalen 426293
       10960:20190715:062122.585 executing housekeeper

       

       

      It could be related to network issues, but we couldn't find any evidences.

      Network traffic on Zabbix server:

      It's unclear for me why Zabbix trappers suddenly increased to 100% and stuck at that value because TrapperTimeout=15 should prevent trappers from hanging. Could you please tell me what do you think about this situation? I would like to prevent such situation in the future, so maybe you'll point me at where else should I look in order to investigate this incident properly.
      Full config:
      zabbix_server.conf

        Attachments

        1. image-2019-07-15-14-40-58-485.png
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        2. image-2019-07-15-14-45-08-944.png
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        3. image-2019-07-15-15-16-25-366.png
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        4. image-2019-07-15-15-16-57-661.png
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        5. image-2019-07-18-16-42-29-891.png
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        6. image-2019-07-18-16-43-05-500.png
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        7. image-2019-07-18-16-44-21-009.png
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        8. image-2019-07-18-16-44-54-449.png
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        9. zabbix_proxy.conf
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        10. zabbix_proxy.conf
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        11. zabbix_server.conf
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        12. zbx_prox_cache.jpg
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        13. zbx_prox_data_gathering.jpg
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        14. zbx_prox_internal.jpg
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        15. zbx_prox_performance.jpg
          zbx_prox_performance.jpg
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        16. Zbx_server_perf_stats.jpg
          Zbx_server_perf_stats.jpg
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        17. Zbx_srv_cache_usage.jpg
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        18. Zbx_srv_data_gathering_process_busy.jpg
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        19. Zbx_srv_internal_process_busy.jpg
          Zbx_srv_internal_process_busy.jpg
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        20. Zbx_srv_performance.jpg
          Zbx_srv_performance.jpg
          88 kB

          Activity

            People

            Assignee:
            edgar.akhmetshin Edgar Akhmetshin
            Reporter:
            vzabauski Valeriy Zabawski
            Votes:
            0 Vote for this issue
            Watchers:
            6 Start watching this issue

              Dates

              Created:
              Updated:
              Resolved: