$ shards install
$ shards update
$ crystal build razor.cr --release --no-debug
sudo ./docker/tests.sh
sudo ./docker/build.sh
HMSET node1.route.example.app.io:CONFIG SOA ...
HMSET node1.route.example.app.io:CONFIG TTL 3600
HMSET node1.route.example.app.io:CONFIG NS ns1.example.org,ns2.example.org
SADD node1.route.example.app.io:A 1.1.1.1 2.2.2.2 3.3.3.3
SADD node1.route.example.app.io:AAAA 2001::1 2001::2 2001::3
HMSET node1.route.example.app.io:CONFIG ANSWER consistent_hash
SADD node1.route.example.app.io:A 1.1.1.1 2.2.2.2 3.3.3.3
SADD node1.route.example.app.io:AAAA 2001::1 2001::2 2001::3
HMSET node1.route.example.app.io:CONFIG ANSWER group_consistent_hash
SADD node1.route.example.app.io:GROUPS GROUP1 GROUP2
SADD GROUP1:A 192.168.1.1 192.168.1.2
SADD GROUP2:A 192.168.2.1 192.168.2.2
SADD GROUP1:AAAA 2001::1 2001::2
SADD GROUP2:AAAA 2002::1 2002::2
This setup requires setting zone in razor.json to be like in this routes.example.org:
HMSET routes.example.org:CONFIG ANSWER geoip
HMSET routes.example.org:CONFIG SOA ...
HMSET routes.example.org:CONFIG TTL 3600
SADD routes.example.org:A 10.0.0.1 10.0.0.2
SADD routes.example.org:AAAA 2a02::1 2a02::2
SADD node1.route.example.app.io:A 1.1.1.1 2.2.2.2
SADD node1.route.example.app.io:AAAA 2001::1 2001::2
SADD node2.route.example.app.io:A 192.168.0.1 192.168.0.2
SADD node2.route.example.app.io:AAAA 2a02:4780::1 2a02:4780::2
SET geoip:eu:lt node1.route.example.app.io
SET geoip:eu node2.route.example.app.io
You can specify the whole range like:
SADD routes.example.org:A 192.168.1.0/24 192.168.2.0/24
SADD routes.example.org:AAAA 2a02:4780:1::/48 2a02:4780:2::/48
And the Razor automatically picks up a random IPv4/IPv6 address from those ranges.
Current limitation is that IPv4 subnet MUST be /24, and IPv6 /48.
With this feature, you also have the ability to skip some specific hosts from being returned by Razor to the client. It's called SKIPLIST. You define:
SADD example.org:A:SKIPLIST 192.168.1.100 192.168.2.255
SADD example.org:AAAA:SKIPLIST 2a02:4780:1:100::/64 2a02:4780:2:255::/64
Skip lists work by checking /32 for IPv4, and /64 for IPv6 addresses.
In this example, if the Razor picks the random IPv6 from 2a02:4780:2::/48, and 2a02:4780:2:255::/64 is defined as a skip-list item, then Razor picks another one that is not blocklisted.
# dnsperf -d data -n 10000
DNS Performance Testing Tool
Nominum Version 2.0.0.0
Statistics:
Queries sent: 40000
Queries completed: 40000 (100.00%)
Queries lost: 0 (0.00%)
Response codes: NOERROR 40000 (100.00%)
Average packet size: request 27, response 49
Run time (s): 0.551791
Queries per second: 72491.214971
Average Latency (s): 0.001175 (min 0.000487, max 0.011503)
Latency StdDev (s): 0.000560
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