[WARN] dns: QName invalid: <ip address of localhost>

Raghu Kumar

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Oct 8, 2015, 10:44:33 AM10/8/15

to Consul

Hello,

I am new to Consul and am setting it up on all instances inside an EC2 VPC. I have configured dnsmasq for DNS lookup. Right now, I have Consul running on 6 nodes; however I get this error on only one Node. All instances are of the same type and has the same AMI.

The warning is printed 4 times every 5 minutes:

2015/10/08 14:05:01 [WARN] dns: QName invalid: <ip address of localhost>.

2015/10/08 14:15:01 [WARN] dns: QName invalid: <ip address of localhost>.

2015/10/08 14:20:01 [WARN] dns: QName invalid: <ip address of localhost>.

These are the steps followed to set up on each instance:

install consul:

-------------------

wget https://dl.bintray.com/mitchellh/consul/0.5.2_linux_amd64.zip

unzip and copy the binary to /usr/local/bin:

---------------------------------------------------------------

unzip -o 0.5.2_linux_amd64.zip -d /usr/local/bin

install dnsmasq:

-------------------------

yum install dnsmasq

# filename: /etc/dnsmasq.conf

# remove comment the below line which is the last line in conf

# conf-dir=/etc/dnsmasq.d

dns related config changes:

----------------------------------------

# filename: /etc/dnsmasq.d/10-consul

server=/consul/127.0.0.1#8600

# filename: /etc/resolv.conf

search consul ec2.internal

nameserver 127.0.0.1

nameserver <VPC DNS Server>

# filename: /etc/consul.d/webui.json

{

"service": {

"name": "webui",

"tags": ["stg"],

"port": 8001,

"checks": [

{

"http": "http://localhost:8001/page/health-check.html",

"interval": "30s"

}

]

}

-----------

start the services:

--------------------------

service dnsmasq start

consul agent -config-dir /etc/consul.d -data-dir /tmp/consul &

# run command: consul join node

consul join <ip address>

------------

Functionally, I don't find any issues, however this warning keeps appearing every 5 minutes which is extremely annoying.

Regards,

Raghu

Armon Dadgar

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Oct 8, 2015, 2:26:40 PM10/8/15

to consu...@googlegroups.com, Raghu Kumar

Hey Raghu,

That warning just indicates a DNS request has been made to Consul for a name that is invalid,

and that it does not know how to process it. It’s not an error in Consul, there is a client making an

invalid request.

In this case a DNS query is being made for <IP address of localhost>.

Best Regards,

Armon Dadgar

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Raghu Kumar

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Oct 9, 2015, 5:38:48 AM10/9/15

to Armon Dadgar, consu...@googlegroups.com

Thank you, Armon for the reply. How can I stop this warning. How do I find out which client it is. Could this be any other client other than Consul?

I have a client agent running on this machine. Its not the IP Address but the Node name of the instance which is mentioned.

2015/10/09 09:10:01 [WARN] dns: QName invalid: ip-10-50-21-232.

If its a client trying to do a DNS resolve of the Node/Host shouldn't it be on the same machine; as the Consul DNS port is tied to localhost?

Regards,

Raghu

Armon Dadgar

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Oct 9, 2015, 5:25:18 PM10/9/15

to Raghu Kumar, consu...@googlegroups.com

Hey Raghu,

You can use tcpdump to see who is making the request to Consul. I believe the

next version includes the IP of the client making the request as well.

However, the node name I think is causing a warning since it lacks a TLD

making it an invalid query name.

Hope that helps!

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