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quick 1-time script to parse pdns_recursor cache hit ratio and qps across a range of hosts
#!/usr/bin/env ruby
#
# Usage:
#
# $ ruby pdns-recursor-cache-stats.rb
#
# Might need to use sudo or run as root to access the pdns_recursor control socket
#
uptime = 0
cache_hits = 0
cache_misses = 0
packetcache_hits = 0
packetcache_misses = 0
#ARGF.each_line do |l|
%x(rec_control get-all).each_line do |l|
key, val = l.split(/\s+/)
uptime = val.to_i if key == 'uptime'
cache_hits = val.to_i if key == 'cache-hits'
cache_misses = val.to_i if key == 'cache-misses'
packetcache_hits = val.to_i if key == 'packetcache-hits'
packetcache_misses = val.to_i if key == 'packetcache-misses'
end
hostname = %x(hostname).chomp
# calculate total cache hit ratio
total_cache_hits = (cache_hits + packetcache_hits)
total_cache_misses = (cache_misses + packetcache_misses)
total_queries = (total_cache_hits + total_cache_misses)
cache_hit_ratio = (total_cache_hits.to_f / total_queries) * 100
#puts format('cache-hit-ratio: %.1f%%', cache_hit_ratio)
# calculate average queries per second
avg_qps = (total_queries.to_f / uptime.to_f)
#puts format('avg-qps: %.2f', avg_qps)
# CSV out; HOSTNAME,CACHE_HIT_PERCENTAGE,AVG_QPS
puts format('%s,%.1f,%.2f', hostname, cache_hit_ratio, avg_qps)
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