I have a vagrant box which is running Mesos, Marathon and Chronos (publicly packaged as playa-mesos). It is a sane environment (I have customized to a 192.168.. ip address though) and I can launch different apps incl. docker containerized ones.
I have tried a new demo, where there is a DNS requirement and the mesos application launch definition is as below :
{
"id": "mesos-dns",
"instances": 1,
"cpus": 0.2,
"mem": 50,
"cmd": "/mesos-dns -config=/config.json",
"container": {
"type": "DOCKER",
"docker": {
"image": "mesosphere/mesos-dns:latest",
"network": "HOST"
},
"volumes": [
{
"containerPath": "/config.json",
"hostPath": "/etc/mesos-dns/config.json",
"mode": "RO"
}
]
}
}
The config.json is as under :
{
"zk": "zk://127.0.0.1:2181/mesos",
"refreshSeconds": 60,
"ttl": 60,
"domain": "mesos",
"port": 53,
"resolvers": ["10.0.2.3"],
"timeout": 5,
"email": "root.mesos-dns.mesos"
}
The /etc/resolv.conf contains nameserver 10.0.2.3
Below is the dig response I get to my DNS query; both are shown below :-
dig _webdis-site-m-shop._tcp.marathon.mesos SRV
; <<>> DiG 9.9.5-3ubuntu0.1-Ubuntu <<>> _webdis-site-m-shop._tcp.marathon.mesos SRV
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 4759
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 8192
;; QUESTION SECTION:
;_webdis-site-m-shop._tcp.marathon.mesos. IN SRV
;; AUTHORITY SECTION:
. 56521 IN SOA a.root-servers.net. nstld.verisign-grs.com. 2016021800 1
800 900 604800 86400
;; Query time: 155 msec
;; SERVER: 10.0.2.3#53(10.0.2.3)
;; WHEN: Thu Feb 18 13:38:21 UTC 2016
;; MSG SIZE rcvd: 143`
As you can see there is no ANSWER and the status NXDOMAIN means that this query resulted in a non-existent domain.
Can someone help me fix this ?
TIA.
This is now fixed. I have taken some thoughts from other posts on SO. I have changed the OOTB setting for ip address etc... Broadly I added the 127.0.0.1 loopback ip addr, virtualbox generated ip addr (which in my case is 192.168.x.y) and retained the existing nameserver entry. The results of the dig command is now :-
dig _webdis-site-m-shop._tcp.marathon.mesos SRV
; <<>> DiG 9.9.5-3ubuntu0.1-Ubuntu <<>> _webdis-site-m-shop._tcp.marathon.mesos SRV
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6284
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; QUESTION SECTION:
;_webdis-site-m-shop._tcp.marathon.mesos. IN SRV
;; ANSWER SECTION:
_webdis-site-m-shop._tcp.marathon.mesos. 60 IN SRV 0 0 31720 webdis-site-m-shop-39847-s0.marathon.mesos.
;; ADDITIONAL SECTION:
webdis-site-m-shop-39847-s0.marathon.mesos. 60 IN A 192.168.56.106
;; Query time: 2 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Feb 18 16:55:57 UTC 2016
;; MSG SIZE rcvd: 216