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Unbound Input Plugin

This plugin gathers stats from Unbound - a validating, recursive, and caching DNS resolver.

Global configuration options

In addition to the plugin-specific configuration settings, plugins support additional global and plugin configuration settings. These settings are used to modify metrics, tags, and field or create aliases and configure ordering, etc. See the CONFIGURATION.md for more details.

Configuration

# A plugin to collect stats from the Unbound DNS resolver
[[inputs.unbound]]
  ## Address of server to connect to, read from unbound conf default, optionally ':port'
  ## Will lookup IP if given a hostname
  server = "127.0.0.1:8953"

  ## If running as a restricted user you can prepend sudo for additional access:
  # use_sudo = false

  ## The default location of the unbound-control binary can be overridden with:
  # binary = "/usr/sbin/unbound-control"

  ## The default location of the unbound config file can be overridden with:
  # config_file = "/etc/unbound/unbound.conf"

  ## The default timeout of 1s can be overridden with:
  # timeout = "1s"

  ## When set to true, thread metrics are tagged with the thread id.
  ##
  ## The default is false for backwards compatibility, and will be changed to
  ## true in a future version.  It is recommended to set to true on new
  ## deployments.
  thread_as_tag = false

Permissions

It's important to note that this plugin references unbound-control, which may require additional permissions to execute successfully. Depending on the user/group permissions of the telegraf user executing this plugin, you may need to alter the group membership, set facls, or use sudo.

Group membership (Recommended):

$ groups telegraf
telegraf : telegraf

$ usermod -a -G unbound telegraf

$ groups telegraf
telegraf : telegraf unbound

Sudo privileges: If you use this method, you will need the following in your telegraf config:

[[inputs.unbound]]
  use_sudo = true

You will also need to update your sudoers file:

$ visudo
# Add the following line:
Cmnd_Alias UNBOUNDCTL = /usr/sbin/unbound-control
telegraf  ALL=(ALL) NOPASSWD: UNBOUNDCTL
Defaults!UNBOUNDCTL !logfile, !syslog, !pam_session

Please use the solution you see as most appropriate.

Metrics

This is the full list of stats provided by unbound-control and potentially collected depending of your unbound configuration. Histogram related statistics will never be collected, extended statistics can also be imported ("extended-statistics: yes" in unbound configuration). In the output, the dots in the unbound-control stat name are replaced by underscores(see https://www.unbound.net/documentation/unbound-control.html for details).

Shown metrics are with thread_as_tag enabled.

  • unbound

    • fields: total_num_queries total_num_cachehits total_num_cachemiss total_num_prefetch total_num_recursivereplies total_requestlist_avg total_requestlist_max total_requestlist_overwritten total_requestlist_exceeded total_requestlist_current_all total_requestlist_current_user total_recursion_time_avg total_recursion_time_median time_now time_up time_elapsed mem_total_sbrk mem_cache_rrset mem_cache_message mem_mod_iterator mem_mod_validator num_query_type_A num_query_type_PTR num_query_type_TXT num_query_type_AAAA num_query_type_SRV num_query_type_ANY num_query_class_IN num_query_opcode_QUERY num_query_tcp num_query_ipv6 num_query_flags_QR num_query_flags_AA num_query_flags_TC num_query_flags_RD num_query_flags_RA num_query_flags_Z num_query_flags_AD num_query_flags_CD num_query_edns_present num_query_edns_DO num_answer_rcode_NOERROR num_answer_rcode_SERVFAIL num_answer_rcode_NXDOMAIN num_answer_rcode_nodata num_answer_secure num_answer_bogus num_rrset_bogus unwanted_queries unwanted_replies

  • unbound_thread

    • tags:
      • thread
    • fields:
      • num_queries
      • num_cachehits
      • num_cachemiss
      • num_prefetch
      • num_recursivereplies
      • requestlist_avg
      • requestlist_max
      • requestlist_overwritten
      • requestlist_exceeded
      • requestlist_current_all
      • requestlist_current_user
      • recursion_time_avg
      • recursion_time_median

Example Output

unbound,host=localhost total_requestlist_avg=0,total_requestlist_exceeded=0,total_requestlist_overwritten=0,total_requestlist_current_user=0,total_recursion_time_avg=0.029186,total_tcpusage=0,total_num_queries=51,total_num_queries_ip_ratelimited=0,total_num_recursivereplies=6,total_requestlist_max=0,time_now=1522804978.784814,time_elapsed=310.435217,total_num_cachemiss=6,total_num_zero_ttl=0,time_up=310.435217,total_num_cachehits=45,total_num_prefetch=0,total_requestlist_current_all=0,total_recursion_time_median=0.016384 1522804979000000000
unbound_threads,host=localhost,thread=0 num_queries_ip_ratelimited=0,requestlist_current_user=0,recursion_time_avg=0.029186,num_prefetch=0,requestlist_overwritten=0,requestlist_exceeded=0,requestlist_current_all=0,tcpusage=0,num_cachehits=37,num_cachemiss=6,num_recursivereplies=6,requestlist_avg=0,num_queries=43,num_zero_ttl=0,requestlist_max=0,recursion_time_median=0.032768 1522804979000000000
unbound_threads,host=localhost,thread=1 num_zero_ttl=0,recursion_time_avg=0,num_queries_ip_ratelimited=0,num_cachehits=8,num_prefetch=0,requestlist_exceeded=0,recursion_time_median=0,tcpusage=0,num_cachemiss=0,num_recursivereplies=0,requestlist_max=0,requestlist_overwritten=0,requestlist_current_user=0,num_queries=8,requestlist_avg=0,requestlist_current_all=0 1522804979000000000