The code parsing and storing the host_file only keeps 1 IpAddr per hostname. In order to use proxy.config.hostdb.strict_round_robin, the record must come through DNS.
*I am trying to get the same thing working with hostdb since I want to > avoid DNS round trip because my IPs are fairly fixed.* You could try setting a long ttl (like 5 minutes) on your DNS response record, which will cause HostDB to cache the IP record for that long. DNS is not repeated until that HostDB record is expired. If you don't have control of the DNS ttl, then you can override it with something like # set minimum IP ttl to 10 seconds proxy.config.hostdb.ttl_mode INT 3 proxy.config.hostdb.timeout INT 10 https://docs.trafficserver.apache.org/en/8.0.x/admin-guide/files/records.config.en.html?highlight=ttl_mode#proxy.config.hostdb.ttl_mode I hope that helps. On Wed, Oct 17, 2018 at 4:15 PM Dk Jack <dnj0...@gmail.com> wrote: > Hi, > I am looking at the hostdb configuration and I need some clarification on > the configuration. In particular I have questions about these two > configuration parameters. > > proxy.config.hostdb.host_file.path > proxy.config.hostdb.strict_round_robin > > I am trying to understand how hostdb round_robin configuration works. In my > setup, I am trying to reach multiple origin servers. I am using the same > domain name for all my origin servers. In my remap, I am using this name. > Since each of my origin servers has a different IP, I was hoping to use the > strict_round_robing configuration to distribute the load amongst the origin > servers. > > The documentation for the first says that the format for host_file.path is > similar to 'hosts' file. However as per the answers for this query... > > > https://serverfault.com/questions/429839/assign-multiple-ips-to-1-entry-in-hosts-file > > The hosts file doesn't support having multiple IPs for the same domain. > Does ATS hostdb behave differently i.e. similar to a DNS server. I am > asking this, because ATS has the hostdb round robin configuration. > > BTW, this configuration works with an DNS server with strict round robing > enabled for my origin server domain. I am trying to get the same thing > working with hostdb since I want to avoid DNS round trip because my IPs are > fairly fixed. > > Thanks for the help. > > Dk. > -- Aaron Canary ATS - Senior Software Engineer
