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The ungleich DNS infrastructure » History » Revision 8

Revision 7 (Nico Schottelius, 11/13/2018 02:53 PM) → Revision 8/27 (Nico Schottelius, 11/13/2018 02:54 PM)

h1. The ungleich DNS infrastructure 

 {{toc}} 

 h2. Status 

 This document is *IN PROGRESS*. 

 

 h2. Overview 


 |                     | *place4*               | *place5*                    *place5                     | *place6*                             | 
 | *DNS64 prefix*      | -                      | 2a0a:e5c0:0:1::/96          | 2a0a:e5c0:2:10::/96                  | 
 | *DNS resolver*      | -                      | 2a0a:e5c0::3 2a0a:e5c0::4 | 2a0a:e5c0:2:1::5 2a0a:e5c0:2:1::6! | 
 | *DNS authorative* | dns1                   | dns2                        | dns3                                 | 
 |                     | 2a01:4f8:150:7092::2 | 2a0a:e5c0::1                | 2a0a:e5c0:2:1::7                     | 
 |                     | 176.9.50.202           | 185.203.112.1               | 185.203.114.1                        | 


 * Every place has 2 redundant caching nameservers. 
 * All zones have 3 authorative nameservers, located in 3 different places 
 * Important zones (like ungleich.ch) need to be resolvable, even if a place goes offline 
 ** For this reason some authorative data needs to be on the caching name servers 
 ** For this reason we stay with a bind9 based setup for the moment (might change in the future) 

 

 h2. Architecture 

 In total we are running 5 servers that are responsible for caching and authorative answers: 

 * Authorative 
 ** 1x server in place4 (bind) 
 ** 1x VRRP IP of routers in place5 (bind) 
 ** 1x VRRP IP of routers in place6 (bind) 
 * Caching 
 ** 2x server ip of router in place5 (bind) 
 ** 2x server ip of router in place6 (bind) 


 h2. How to update the ungleich DNS servers 

 To update all 5 servers, use: 

 <pre> 
 cdist config d{1..5}.ungleich.ch 
 </pre> 

 h2. How to use the authorative DNS servers in zone files 

 Add the following to your zone file: 

 <pre> 
     ; server1.place4 
     IN NS dns1.ungleich.ch. 

     ; vrrp active router @ place5 
     IN NS dns2.ungleich.ch. 
    
     ; vrrp active router @ place6 
     IN NS dns3.ungleich.ch. 
 </pre>