Thanks. I was hoping that mesos-dns will do it for me and I can run services on different ports even on the same node. I was hesitant to use HAProxy. I think I have to use HAProxy/Bamboo to achieve this functionality.
From: Ondrej Smola <[email protected]<mailto:[email protected]>> Reply-To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Date: Thursday, July 16, 2015 at 2:55 PM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: Re: Mesos-DNS configuration problem with dockerized web application 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]<mailto:[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<http://172.31.50.58:2181>,172.31.50.59:2181<http://172.31.50.59:2181>,172.31.50.60:2181/mesos<http://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 |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 ________________________________ This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, notify the sender immediately by return email and delete the message and any attachments from your system.
