Hi,
I noticed that there is problem with DNS resolution.
When I send http request directly from the node on which the traffic server is
installed to the origin server, I am able to receive response from the server.
That seems the DNS is working. But When I use Traffic server, It is giving 502
server not found error. When I debugged with “dns” option, it is returns
response code 3.
Does Traffic server need any special DNS mapping.
I first tried with only one level of proxying but unable to do when I use
hostnames in the remap config.
It resolves the hostname for traffic server node but the dns resolving does not
happens for origin servers. WhenI use IP addresses for origin servers, the
loadbalancer is working. But I need hostnames to be used for origin servers in
the remap.config when I go hierarchical proxying.
Any pointers on where to look to solve this issue will be appreciated.
Thanks
Gandhimathi
gvelus01@clb:/usr/local$ sudo bin/traffic_server -T "dns"
traffic_server: using root directory '/usr/local'
[Nov 14 10:30:56.876] Server {0x7f41b7666780} DEBUG:
<DNS.cc<http://dns.cc>:1604 (ink_dns_init)> (dns) ink_dns_init: called with
init_called = 0
[Nov 14 10:30:56.879] Server {0x7f41b7666780} DEBUG: <DNS.cc<http://dns.cc>:247
(dns_init)> (dns) localhost=clb
[Nov 14 10:30:56.879] Server {0x7f41b7666780} DEBUG: <DNS.cc<http://dns.cc>:248
(dns_init)> (dns) Round-robin nameservers = 1
[Nov 14 10:30:56.888] Server {0x7f41b3c7d700} DEBUG: <DNS.cc<http://dns.cc>:482
(startEvent)> (dns) DNSHandler::startEvent: on thread 0
[Nov 14 10:30:56.888] Server {0x7f41b3c7d700} DEBUG: <DNS.cc<http://dns.cc>:427
(open_con)> (dns) open_con: opening connection 10.103.0.1:53
[Nov 14 10:30:56.888] Server {0x7f41b3c7d700} DEBUG:
<DNSConnection.cc<http://dnsconnection.cc>:143 (connect)> (dns) random port =
0.0.0.0:52329
[Nov 14 10:30:56.888] Server {0x7f41b3c7d700} DEBUG: <DNS.cc<http://dns.cc>:455
(open_con)> (dns) opening connection 10.103.0.1:53 SUCCEEDED for 0
[Nov 14 10:30:56.888] Server {0x7f41b3c7d700} DEBUG: <DNS.cc<http://dns.cc>:504
(startEvent)> (dns_pas) opened connection to 10.103.0.1:53, n_con = 1
[Nov 14 10:31:11.913] Server {0x7f41b3c7d700} DEBUG:
<DNS.cc<http://dns.cc>:1091 (getby)> (dns) received query cs2 type = 1, timeout
= 0
[Nov 14 10:31:11.913] Server {0x7f41b3c7d700} DEBUG:
<DNS.cc<http://dns.cc>:1057 (mainEvent)> (dns) enqueing query cs2
[Nov 14 10:31:11.913] Server {0x7f41b3c7d700} DEBUG:
<DNS.cc<http://dns.cc>:1063 (mainEvent)> (dns) adding first to collapsing queue
[Nov 14 10:31:11.913] Server {0x7f41b3c7d700} DEBUG: <DNS.cc<http://dns.cc>:978
(write_dns_event)> (dns) send query (qtype=1) for cs2 to fd 21
[Nov 14 10:31:11.913] Server {0x7f41b3c7d700} DEBUG:
<DNS.cc<http://dns.cc>:1010 (write_dns_event)> (dns) sent qname = cs2, id =
22417, nameserver = 0
[Nov 14 10:31:11.913] Server {0x7f41b3c7d700} DEBUG: <P_DNSProcessor.h:239
(sent_one)> (dns) sent_one: failover_number for resolver 0 is 1
[Nov 14 10:31:11.914] Server {0x7f41b3c7d700} DEBUG: <DNS.cc<http://dns.cc>:759
(recv_dns)> (dns) received packet size = 21
[Nov 14 10:31:11.914] Server {0x7f41b3c7d700} DEBUG: <DNS.cc<http://dns.cc>:761
(recv_dns)> (dns) round-robin: nameserver 0 DNS response code = 0
[Nov 14 10:31:11.914] Server {0x7f41b3c7d700} DEBUG:
<DNS.cc<http://dns.cc>:1306 (dns_process)> (dns) received rcode = 3
[Nov 14 10:31:11.914] Server {0x7f41b3c7d700} DEBUG:
<DNS.cc<http://dns.cc>:1328 (dns_process)> (dns) DNS error 3 for [cs2]
On Nov 13, 2017, at 6:16 PM, Velusamy, Gandhimathi
<[email protected]<mailto:[email protected]>> wrote:
Hi,
I am trying to distribute the load balancing between servers connected with
three proxies.
In my setup, I have three proxy servers and each of them have two origin
servers and one client.
I would like to balance the load across servers connected with other proxies
when the rate of incoming requests are more.
To begin, I started with round robin policy.
First I tried to add the proxy2 and proxy 2 as one of the origin servers in
remap config as below:
map http://UHLB<http://uhlb/> http://UHLB<http://uhlb/> @plugin=balancer.so
@pparam=--policy=roundrobin @pparam=192.168.20.2 @pparam=192.168.30.2
@pparam=192.168.40.2 @pparam=192.168.50.2
The last two IP addresses are proxy 2 and proxy3.
But It did not work.
I read about parent proxying. But in my case, I want to load balance. May I
please know to configure to achieve load balancing across hierarchical proxies.
Thanks
Gandhimathi
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