MesosCon University App Definitions

constraints.json

{
  "id": "/constraintstask",
  "instances": 10,
  "container": {
    "type": "MESOS"
  },
  "cpus": 0.1,
  "mem": 128,
  "cmd": "sleep 100",
  "constraints": [
    [
      "hostname",
      "UNIQUE"
    ]
  ]
}

cpu.json

{
  "id": "/cputask",
  "instances": 1,
  "container": {
    "type": "MESOS"
  },
  "cpus": 10,
  "mem": 128,
  "cmd": "sleep 100"
}

kuard basic.json

{
  "id": "/students/userXX/kuard",
  "instances": 1,
  "cpus": 0.1,
  "mem": 64,
  "container": {
    "type": "DOCKER",
    "docker": {
      "image": "gkleiman/checks-demo",
      "network": "BRIDGE",
      "portMappings": [
        {
          "name": "http",
          "containerPort": 8080,
          "hostPort": 0,
          "protocol": "tcp"
        }
      ]
    }
  },
   "labels": {
     "HAPROXY_GROUP": "external"
 }
}

kuard health.json

{
  "id": "/students/userXX/kuard",
  "instances": 1,
  "cpus": 0.1,
  "mem": 64,
  "container": {
    "type": "DOCKER",
    "docker": {
      "image": "gkleiman/checks-demo",
      "network": "BRIDGE",
      "portMappings": [
        {
	  "name": "http",
          "containerPort": 8080,
          "hostPort": 0,
          "protocol": "tcp"
        }
      ]
    }
  },
  "args": ["--health-fail-next", "3"],
  "healthChecks": [
    {
      "protocol": "MESOS_HTTP",
      "portIndex": 0,
      "path": "/healthy",
      "gracePeriodSeconds": 0,
      "intervalSeconds": 5,
      "timeoutSeconds": 3,
      "maxConsecutiveFailures": 3
    }
  ],
   "labels": {
     "HAPROXY_GROUP": "external"
 }
}

kuard readiness

{
  "id": "/students/userXX/kuard",
  "instances": 1,
  "cpus": 0.1,
  "mem": 64,
  "container": {
    "type": "DOCKER",
    "docker": {
      "image": "gkleiman/checks-demo",
      "network": "BRIDGE",
      "portMappings": [
        {
	  "name": "http",
          "containerPort": 8080,
          "hostPort": 0,
          "protocol": "tcp"
        }
      ]
    }
  },
  "args": ["--readiness-fail-next", "3"],
  "readinessChecks": [
    {
      "portName": "http",
      "intervalSeconds": 30,
      "timeoutSeconds": 3,
      "protocol": "HTTP",
      "path": "/ready"
    }
  ],
   "labels": {
     "HAPROXY_GROUP": "external"
 }
}

nginx instructions

# Point the CLI at the right cluster
dcos cluster setup 35.197.107.167

# Install the marathon app
dcos marathon app add < nginx.json

# Show the UI and try and navigate to the "Endpoint" listed
#
# Try and get the public IP of the agent (won't work because curl is not installed)
dcos task exec nginx-demo curl http://169.254.169.254/latest/meta-data/public-ipv4

# Start an interactive session to install curl
dcos task exec -it nginx-demo bash
$ apt-get update
$ apt-get install -y curl
$ curl http://169.254.169.254/latest/meta-data/public-ipv4; echo ""
$ exit

# Try and navigate to the "Endpoint" with the updated public IP
# Update the port that nginx is serving on
$ dcos task exec -it nginx-demo bash
$ vim # won't work
$ apt-get install -y vim
$ vim /etc/nginx/conf.d/default.conf
$ service nginx restart

nginx.json

{
    "id": "nginx-demo",
    "container": {
        "type": "MESOS",
        "docker": {
            "image": "library/nginx"
        }
    },
    "cmd": "sleep 999999999",
    "cpus": 0.2,
    "instances": 1,
    "acceptedResourceRoles": ["slave_public"]
}