root@bind@:/data/log/named# tail -f warning.log 02-Apr-2019 11:51:50.000 client: warning: client x.x.x.x#38689: no more recursive clients (1000/0/1000): quota reached 02-Apr-2019 11:51:51.002 client: warning: client x.x.x.x#59881: no more recursive clients (1000/0/1000): quota reached 02-Apr-2019 11:51:52.001 client: warning: client x.x.x.x#40641: no more recursive clients (1000/0/1000): quota reached
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recursive-clients The maximum number of simultaneous recursive lookups the server will perform on behalf of clients. The default is 1000. Because each recursing client uses a fair bit of memory, on the order of 20 kilobytes, the value of the recursive-clients option may have to be decreased on hosts with limited memory.
root@bind:~# rndc status version: 9.8.1-P1 CPUs found: 4 worker threads: 4 number of zones: 21 debug level: 0 xfers running: 0 xfers deferred: 0 soa queries in progress: 0 query logging is ON recursive clients: 2409/9900/10000 tcp clients: 0/100 server is up and running