Hi,
"portMappings": [
{ "containerPort": 8080, "hostPort": *80*, "servicePort": 9000,
"protocol": "tcp" }
]
will work - you need to specify required port as hostPort
only limitation of this setup is that you wont be able to run multiple
services on single host with same hostPort (port collision)
but for most setups you should be ok with just choosing random/different
ports for different services or ensuring there are more nodes than
requested instances with same port
if you want to use random port - you will need some have logic to query DNS
and parse SRV records and for example setup HA proxy with correctly
assigned ports
this problem can also be solved using SDN (for example flannel/weave -)
assigning each service unique IP address and dont care about port
collisions - but this is not related to MesosDNS - just info :)
2015-07-16 17:58 GMT+02:00 Dvorkin-Contractor, Eugene (CORP) <
[email protected]>:
> Hi,
> I can’t access my application using mesos-dns. Neither port 8123 nor 8080
> responding. I think I miss something in configuration but can’t find
> problem myself.
>
> I have a very basic java application that listen on port 8080. I have
> created docker image and deployed this application to marathon.
> My deployment configuration is following:
> $ cat app-slick.json
> {
> "container": {
> "type": "DOCKER",
> "docker": {
> "image": "edvorkin/slick-swagger:1",
> "network": "BRIDGE",
> "portMappings": [
> { "containerPort": 8080, "hostPort": 0, "servicePort": 9000,
> "protocol": "tcp" }
> ]
> }
> },
> "cmd": "java -jar /tmp/spray-slick-swagger-assembly-0.0.2.jar Boot",
> "id": "slick-swagger-demo",
> "instances": 1,
> "cpus": 0.1,
> "mem": 256,
> "constraints": [
> ["hostname", "UNIQUE"]
> ]
> }
> Application successfully deployed to 2 nodes and assigned random port of
> 31990 and 31000 on each node.
> Now I installed and configured Mesos-DNS with config.json
> {
> "zk": "zk://172.31.50.58:2181,172.31.50.59:2181,172.31.50.60:2181/mesos",
> "refreshSeconds": 60,
> "ttl": 60,
> "domain": "mesos",
> "port": 53,
> "resolvers": ["172.31.0.2"],
> "timeout": 5,
> "email": "root.mesos-dns.mesos"
> }
>
>
> and I got following:
>
> $ *dig slick-swagger-demo.marathon.mesos*
>
> ; <<>> DiG 9.9.4-RedHat-9.9.4-18.el7_1.1 <<>>
> slick-swagger-demo.marathon.mesos
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20376
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
>
> ;; QUESTION SECTION:
> ;slick-swagger-demo.marathon.mesos. IN A
>
> ;; ANSWER SECTION:
> slick-swagger-demo.marathon.mesos. 60 IN A 172.31.11.202
> slick-swagger-demo.marathon.mesos. 60 IN A 172.31.11.203
>
> ;; Query time: 1 msec
> ;; SERVER: 54.86.164.193#53(54.86.164.193)
> ;; WHEN: Thu Jul 16 15:23:04 UTC 2015
> ;; MSG SIZE rcvd: 83
>
>
> *curl
> http://localhost:8123/v1/services/_slick-swagger-demo._tcp.marathon.mesos
> <http://localhost:8123/v1/services/_slick-swagger-demo._tcp.marathon.mesos>
> |python -m json.tool*
> % Total % Received % Xferd Average Speed Time Time Time
> Current
> Dload Upload Total Spent Left
> Speed
> 100 289 100 289 0 0 1916 0 --:--:-- --:--:-- --:--:--
> 1926
> [
> {
> "host": "slick-swagger-demo-15491-s42.marathon.mesos.",
> "ip": "172.31.11.203",
> "port": "31990",
> "service": "_slick-swagger-demo._tcp.marathon.mesos"
> },
> {
> "host": "slick-swagger-demo-20495-s43.marathon.mesos.",
> "ip": "172.31.11.202",
> "port": "31000",
> "service": "_slick-swagger-demo._tcp.marathon.mesos"
> }
> ]
>
> But when I try to access my application using dns name, I can’t get get
> response.
> curl http://slick-swagger-demo.marathon.mesos:8080
> curl: (7) Failed connect to slick-swagger-demo.marathon.mesos:8080;
> Connection refused
>
> curl slick-swagger-demo.marathon.mesos:8123
> 404: Page Not Found
>
> curl slick-swagger-demo.marathon.mesos:31990 – produce desired results,
> but that binded to a random port.
>
> How do I configure mapping between random ports and my service?
> I would like to be able to access my server on port 80 for example
> Curl http://slick-swagger-demo.marathon.mesos
>
> Thanks
> Eugene
>
>
>
>
>
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