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better upstream server description (#1106)

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gluon-core: dns-cache documentation polish
Now its clear that upstreams severs normally means "community gateways".
* added cacheentries to description
* made upstream server description more general
* description of the A and AAAA-records for next_node added
* mention of Cache not being allocated when not set in site.conf 
* dns-cache doku polish
This commit is contained in:
Tarnatos 2017-04-26 19:02:22 +02:00 committed by Christof Schulze
parent 6c053d92b8
commit 22042a3bf2
1 changed files with 14 additions and 4 deletions
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18
docs/features/dns-cache.rst
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@ -6,11 +6,21 @@ between node and gateway as small as possible. In order to do this, a
dns-cache may be used on a node. The dnsmasq instance listening on port
53 on the node will be reconfigured to answer requests, use a list of
upstream servers and a specific cache size if the options listed below are
added to site.conf. All settings are optional, though if no dns server is
set, the configuration will not be altered by gluon-core.
added to site.conf. Upstream servers are the DNS servers which are normally
used by the nodes to resolve hostnames (e.g. gateways/supernodes).
Besides caching dns requests from clients, the next_node-addresses are set to
resolve to a configurable name that may optionally be placed in next_node.name.
There are the following settings:
servers
cacheentries
If both options are set the node will cache as much DNS records as set with
'cacheentries' in RAM. The 'servers' list will be used to resolve the received
DNS-queries if the request cannot be answered from cache.
If these settings do not exist, the cache is not intialized and RAM-usage will not increase.
When next_node.name is set, an A-record and an AAAA-record for the
next-node-IP are placed in the dnsmasq configuration. This means that the content
of next_node.name may be resolved even without upstream connectivity.
::