Hi guys,
I'm a little confused by the wording on the official haproxy ver1.6
documentation(https://cbonte.github.io/haproxy-dconv/1.6/configuration.html)
especially as concerning dns resolution.
Here's a section of my haproxy config:
## start config
resolvers my_dns_resolver
#Google name servers
nameserver dns1 8.8.8.8:53
nameserver dn2 8.8.4.4:53
resolve_retries 30
timeout retry 1s
hold valid 2010
frontend my_frontend
bind *:80
default_backend my_backend
backend my_backend
balance roundrobin
server my_domain my_domain.com check resolvers my_dns_resolver inter 2000
## end config
So my question is,
How often will haproxy (version 1.6) do a dns resolution? Is it every
2000 ms(health check interval) or
every 10ms (2010 modulo 2000) ?
The documenation says:
`Note: since the name resolution is triggered by the health checks, a new
resolution is triggered after <period> modulo the <inter> parameter of
the healch check.`
but I'm getting confused by the wording.
I have two interpretations from reading that documentaion;
1. dns resolution is triggered by health checks and thus will happen
(<period> modulo the <inter>) milliseconds after the health check.
2. dns resolution will happen every (<period> modulo the <inter>) milliseconds.
So if we start at time 00.00.00.00(hh.mm.ss.ms)
for case 1 above health check happens at 00.00.02.00 and first dns
resolution happens at
00.00.02.10 and second one at 00.00.04.10 etc
while for case 2 above health check happens at 00.00.02.00 and first
dns resolution happens at
00.00.02.10 and second one at 00.00.02.20 etc
thanks,
Komu W.
