Description

Orcheration Docker with Mesos/Marathon/Demios

Intro

About Mesos

Applications in the Cloud Era

From Static Partitioning to Elastic Sharing

Tested Physical Env.

• OS: Ubuntu 12.04.4 LTS amd64 (3.11.0-15-generic / 8Cores / 8GB RAM)
• Vagrant: 1.6.5
• VirtualBox: 4.3.18 r96516 (/w Oracle VM VirtualBox Extension Pack)

Mesos Env.

• One Mesos Master Node
  • Mesos-Master
  • Marathon
  • Zookeeper
• Two Mesos Slave Nodes
  • Mesos-Slave
  • Docker
  • (Note) Edit "num_slave_nodes" in Vagrantfile
• Parameters in Vagrantfile
  • master_ip
  • use_deimos : default is "false"
  • use_mesos_dns : default is "true"
  • use_chronos : default is "false"
  • docker_bip : default is "172.17.42.1"
  • mesos_dns_conf_ttl : default is "60"
  • mesos_dns_conf_port : default is "53"
  • mesos_dns_conf_domain : default is "mesos"
  • use_weave : default is "false"

ScreenShots

Mesos UI

Marathon UI (1)

Marathon UI (2)

Marathon UI (3)

HowTo

host> vagrant up

Mesos Web-UI

Browser> http://{Vagrant-Host-IP}:5050

Marathon Web-UI

Browser> http://{Vagrant-Host-IP}:8080

Chronos Web-UI

Browser> http://{Vagrant-Host-IP}:4400

APPENDIX

Example API

• Ref: https://mesosphere.github.io/marathon/docs/rest-api.html

e.g. Creating Marathon Task

(Note) Call API to master node, and Required two slave nodes.

curl -X POST -H "Accept: application/json" -H "Content-Type: application/json" master:8080/v2/apps -d '
{
  "id": "bridged-webapp",
  "cmd": "python3 -m http.server 8080",
  "cpus": 0.1,
  "mem": 64.0,
  "instances": 2,
  "container": {
    "type": "DOCKER",
    "docker": {
      "image": "python:3",
      "network": "BRIDGE",
      "portMappings": [
        { "containerPort": 8080, "hostPort": 0, "servicePort": 9000, "protocol": "tcp" },
        { "containerPort": 161, "hostPort": 0, "protocol": "udp"}
      ]
    }
  },
  "env": {
    "FOO": "foo",
    "BAR": "bar"
  },
  "constraints": [
    [
      "hostname",
      "UNIQUE"
    ]
  ]
}
'

e.g. Mesos-DNS Query

• Ref: http://mesosphere.github.io/mesos-dns/docs/naming.html

A Records

• An A record associates a hostname to an IP address. For task task launched by framework framework, Mesos-DNS generates an A record for hostname task.framework.domain that provides the IP address of the specific slave running the task.

# dig bridged-webapp.marathon.mesos A

; <<>> DiG 9.9.5-3-Ubuntu <<>> bridged-webapp.marathon.mesos A
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47141
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;bridged-webapp.marathon.mesos.	IN	A

;; ANSWER SECTION:
bridged-webapp.marathon.mesos. 60 IN	A	192.168.10.51
bridged-webapp.marathon.mesos. 60 IN	A	192.168.10.52

;; Query time: 2 msec
;; SERVER: 192.168.10.11#53(192.168.10.11)
;; WHEN: Wed Mar 11 02:13:51 UTC 2015
;; MSG SIZE  rcvd: 137

SRV Records

• An SRV record associates a service name to a hostname and an IP port. For task task launched by framework framework, Mesos-DNS generates an SRV record for service name _task._protocol.framework.domain, where protocol is udp or tcp.

# dig _bridged-webapp._tcp.marathon.mesos SRV

; <<>> DiG 9.9.5-3-Ubuntu <<>> _bridged-webapp._tcp.marathon.mesos SRV
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35551
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;_bridged-webapp._tcp.marathon.mesos. IN	SRV

;; ANSWER SECTION:
_bridged-webapp._tcp.marathon.mesos. 60	IN SRV	0 0 31000 bridged-webapp.marathon.mesos.
_bridged-webapp._tcp.marathon.mesos. 60	IN SRV	0 0 31001 bridged-webapp.marathon.mesos.
_bridged-webapp._tcp.marathon.mesos. 60	IN SRV	0 0 31000 bridged-webapp.marathon.mesos.
_bridged-webapp._tcp.marathon.mesos. 60	IN SRV	0 0 31001 bridged-webapp.marathon.mesos.

;; Query time: 5 msec
;; SERVER: 192.168.10.11#53(192.168.10.11)
;; WHEN: Wed Mar 11 02:15:08 UTC 2015
;; MSG SIZE  rcvd: 389