dns_cache Module

Table of Contents

1. Admin Guide
1.1. Overview
1.2. Dependencies
1.2.1. OpenSIPS Modules
1.3. Exported Parameters
1.3.1. cachedb_url (string)
1.3.2. blacklist_timeout (int)
1.4. Exported Functions
2. Contributors
2.1. By Commit Statistics
2.2. By Commit Activity
3. Documentation
3.1. Contributors

List of Tables

2.1. Top contributors by DevScore(1), authored commits(2) and lines added/removed(3)
2.2. Most recently active contributors(1) to this module

List of Examples

1.1. Set cachedb_url parameter
1.2. Set blacklist_timeout parameter

Chapter1.Admin Guide


This module is an implementation of a cache system designed for DNS records. For succesfull DNS queries of all types, the module will store in a cache/db backend the mappings, for TTL number of seconds received in the DNS answer. Failed DNS queries will also be stored in the back-end, with a TTL that can be specified by the user. The module uses the Key-Value interface exported from the core.


1.2.1.OpenSIPS Modules

A cachedb_* type module must be loaded before loading the dns_cache module.

1.3.Exported Parameters

1.3.1.cachedb_url (string)

The url of the key-value back-end that will be used for storing the DNS records.

Example1.1.Set cachedb_url parameter

#use internal cachedb_local module
modparam("dns_cache", "cachedb_url","local://")
#use cachedb_memcached module with memcached server at
modparam("dns_cache", "cachedb_url","memcached://")

1.3.2.blacklist_timeout (int)

The number of seconds that a failed DNS query will be kept in cache. Default is 3600.

Example1.2.Set blacklist_timeout parameter

modparam("dns_cache", "blacklist_timeout",7200) # 2 hours

1.4.Exported Functions

The module does not export functions to be used in configuration script.


2.1.By Commit Statistics

Table2.1.Top contributors by DevScore(1), authored commits(2) and lines added/removed(3)

NameDevScoreCommitsLines ++Lines --
1. Vlad Paiu (@vladpaiu)14510063
2. Liviu Chircu (@liviuchircu)752631
3. Bogdan-Andrei Iancu (@bogdan-iancu)75155
4. Razvan Crainea (@razvancrainea)64612

(1) DevScore = author_commits + author_lines_added / (project_lines_added / project_commits) + author_lines_deleted / (project_lines_deleted / project_commits)

(2) including any documentation-related commits, excluding merge commits. Regarding imported patches/code, we do our best to count the work on behalf of the proper owner, as per the "fix_authors" and "mod_renames" arrays in opensips/doc/build-contrib.sh. If you identify any patches/commits which do not get properly attributed to you, please submit a pull request which extends "fix_authors" and/or "mod_renames".

(3) ignoring whitespace edits, renamed files and auto-generated files

2.2.By Commit Activity

Table2.2.Most recently active contributors(1) to this module

NameCommit Activity
1. Bogdan-Andrei Iancu (@bogdan-iancu)Jun 2012 - Jun 2018
2. Liviu Chircu (@liviuchircu)Mar 2014 - Jun 2018
3. Razvan Crainea (@razvancrainea)Feb 2012 - Dec 2016
4. Vlad Paiu (@vladpaiu)Feb 2012 - Oct 2012

(1) including any documentation-related commits, excluding merge commits



Last edited by: Bogdan-Andrei Iancu (@bogdan-iancu), Liviu Chircu (@liviuchircu), Razvan Crainea (@razvancrainea), Vlad Paiu (@vladpaiu).

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