Pod 示例

了解字段定义和 Pod 示例

带注释的简单 Pod 定义

这个名为 的 Pod 只有一个容器 simpletask1。容器展开镜像（python:3.5.2-alpine）并运行命令。

带注释的多个 Pod 及所有参数

下面的示例显示了一个 pod（test-pod），以及三个容器（ healthtask1、 healthtask2、和 clienttask）。Pod 使用共享卷和本地 DC/OS 虚拟网络解决方案。

  1. {
  2.    "id":"/test-pod",
  3.    "labels":{
  4.       "pod_label":"pod"
  5.    },
  6.    "environment":{
  7.       "POD_ENV":"pod"
  8.    },
  9.    "containers":[
  10.       {
  11.          "name":"healthtask1",
  12.          "exec":{
  13.             "command":{
  14.                "shell":"./read-write-server.py 8080 mount1/test-file.txt"
  15.             }
  16.          },
  17.          "resources":{
  18.             "cpus":0.1,
  19.             "mem":32,
  20.             "disk":32,
  21.             "gpus":0
  22.          },
  23.          "endpoints":[
  24.             {
  25.                "name":"httpendpoint",
  26.                "containerPort":8080,
  27.                "hostPort":0,
  28.                "protocol":[
  29.                   "tcp"
  30.                ],
  31.                "labels":{
  32.                   "ep1_label":"ep1"
  33.                }
  34.             }
  35.          ],
  36.          "image":{
  37.             "kind":"DOCKER",
  38.             "id":"python:3.5.2-alpine"
  39.          },
  40.          "environment":{
  41.             "C1_ENV":"c1"
  42.          },
  43.          "healthCheck":{
  44.             "http":{
  45.                "endpoint":"httpendpoint",
  46.                "path":"/ping",
  47.                "scheme":"HTTP"
  48.             },
  49.             "gracePeriodSeconds":30,
  50.             "intervalSeconds":5,
  51.             "maxConsecutiveFailures":3,
  52.             "timeoutSeconds":3,
  53.             "delaySeconds":2
  54.          },
  55.          "volumeMounts":[
  56.             {
  57.                "name":"sharedvolume",
  58.                "mountPath":"mount1"
  59.             }
  60.          ],
  61.          "artifacts":[
  62.             {
  63.                "uri":"https://s3-us-west-2.amazonaws.com/mesos-soak-cluster/read-write-server.py",
  64.                "extract":false,
  65.                "executable":true,
  66.                "cache":true,
  67.                "destPath":"read-write-server.py"
  68.             }
  69.          ],
  70.          "labels":{
  71.             "c1_label":"c1"
  72.          }
  73.       },
  74.       {
  75.          "name":"healthtask2",
  76.          "exec":{
  77.             "command":{
  78.                "shell":"./read-write-server.py 8081 mount2/test-file.txt"
  79.             }
  80.          },
  81.          "resources":{
  82.             "cpus":0.1,
  83.             "mem":32,
  84.             "disk":32,
  85.             "gpus":0
  86.          },
  87.          "endpoints":[
  88.             {
  89.                "name":"httpendpoint2",
  90.                "containerPort":8081,
  91.                "hostPort":0,
  92.                "protocol":[
  93.                   "tcp"
  94.                ],
  95.                "labels":{
  96.                   "ep2_label":"ep2"
  97.                }
  98.             }
  99.          ],
  100.          "image":{
  101.             "kind":"DOCKER",
  102.             "id":"python:3.5.2-alpine"
  103.          },
  104.          "environment":{
  105.             "C2_ENV":"c2"
  106.          },
  107.          "healthCheck":{
  108.             "http":{
  109.                "endpoint":"httpendpoint2",
  110.                "path":"/ping",
  111.                "scheme":"HTTP"
  112.             },
  113.             "gracePeriodSeconds":30,
  114.             "intervalSeconds":5,
  115.             "maxConsecutiveFailures":3,
  116.             "timeoutSeconds":3,
  117.             "delaySeconds":2
  118.          },
  119.          "volumeMounts":[
  120.             {
  121.                "name":"sharedvolume",
  122.                "mountPath":"mount2"
  124.          ],
  125.          "artifacts":[
  126.             {
  127.                "uri":"https://s3-us-west-2.amazonaws.com/mesos-soak-cluster/read-write-server.py",
  128.                "extract":false,
  129.                "executable":true,
  130.                "cache":true,
  131.                "destPath":"read-write-server.py"
  132.             }
  133.          ],
  134.          "labels":{
  135.             "c2_label":"c2"
  136.          }
  137.       },
  138.          "name":"clienttask",
  139.          "exec":{
  140.             "command":{
  141.                "shell":"while true; do sleep 5 && curl -X GET localhost:8080/write && curl -X GET localhost:8081/read; done"
  142.             }
  143.          },
  144.          "resources":{
  145.             "cpus":0.1,
  146.             "mem":32,
  147.             "disk":32,
  148.             "gpus":0
  149.          },
  150.          "endpoints":[
  152.          ],
  153.          "environment":{
  154.             "C3_ENV":"c3"
  155.          },
  156.          "volumeMounts":[
  158.          ],
  159.          "artifacts":[
  161.          ],
  162.          "labels":{
  163.             "c3_label":"c3"
  164.          }
  165.       }
  166.    ],
  167.    "secrets":{
  169.    },
  170.    "volumes":[
  171.       {
  172.          "name":"sharedvolume"
  173.       }
  174.    ],
  175.    "networks":[
  176.       {
  177.          "name":"dcos",
  178.          "mode":"container",
  179.          "labels":{
  180.             "net_label":"net"
  181.          }
  182.       }
  183.    ],
  184.    "scaling":{
  185.       "kind":"fixed",
  186.       "instances":1,
  187.       "maxInstances":null
  188.    },
  189.    "scheduling":{
  190.       "backoff":{
  191.          "backoff":1,
  192.          "backoffFactor":1.15,
  193.          "maxLaunchDelaySeconds":300
  194.       },
  195.       "upgrade":{
  196.          "minimumHealthCapacity":1,
  197.          "maximumOverCapacity":1
  198.       },
  199.       "placement":{
  200.          "constraints":[
  202.          ],
  203.          "acceptedResourceRoles":[
  205.          ]
  206.       },
  207.       "killSelection":"YOUNGEST_FIRST",
  208.       "unreachableStrategy":{
  209.          "inactiveAfterSeconds":900,
  210.          "expungeAfterSeconds":604800
  211.       }
  212.    },
  213.    "executorResources":{
  214.       "cpus":0.1,
  215.       "mem":32,
  216.       "disk":10
  217.    }
  218. }

带有多个容器的 Pod

使用临时卷的 Pod

以下 pod 定义指定了称为 v1 的临时卷。

  1. {
  2.   "id": "/with-ephemeral-vol",
  3.   "version": "2017-01-03T17:36:39.389Z",
  4.   "containers": [
  5.     {
  6.       "name": "ct1",
  7.       "exec": {
  8.         "command": {
  9.           "shell": "while true; do echo the current time is $(date) > ./jdef-v1/clock; sleep 1; done"
  10.         }
  11.       },
  12.       "resources": {
  13.         "cpus": 0.1,
  14.         "mem": 32,
  15.         "disk": 0,
  16.         "gpus": 0
  17.       },
  18.       "volumeMounts": [
  19.         {
  20.           "name": "v1",
  21.           "mountPath": "jdef-v1"
  22.         }
  23.       ]
  24.     },
  25.     {
  26.       "name": "ct2",
  27.       "exec": {
  28.         "command": {
  29.           "shell": "while true; do cat ./etc/clock; sleep 1; done"
  30.         }
  31.       },
  32.       "resources": {
  34.         "mem": 32,
  35.         "disk": 0,
  36.         "gpus": 0
  37.       },
  38.       "volumeMounts": [
  39.         {
  40.           "name": "v1",
  41.           "mountPath": "etc"
  42.         }
  43.       ]
  44.     }
  45.   ],
  46.   "volumes": [
  47.     {
  48.       "name": "v1"
  49.     }
  50.   ],
  51.   "networks": [
  52.     {
  53.       "mode": "host"
  54.     }
  55.   ],
  56.   "scaling": {
  57.     "kind": "fixed",
  58.     "instances": 1,
  59.     "maxInstances": null
  60.   },
  61.   "scheduling": {
  62.     "backoff": {
  63.       "backoff": 1,
  64.       "backoffFactor": 1.15,
  65.       "maxLaunchDelaySeconds": 300
  66.     },
  67.     "upgrade": {
  68.       "minimumHealthCapacity": 1,
  69.     },
  70.     "killSelection": "Youngest_First",
  71.     "unreachableStrategy": {
  72.       "inactiveAfterSeconds": 900,
  73.       "expungeAfterSeconds": 604800
  74.     }
  75.   },
  76.   "executorResources": {
  77.     "cpus": 0.1,
  78.     "mem": 32,
  79.     "disk": 10
  80.   }
  81. }

使用持久卷的 Pod

如需查看使用持久卷的 pod 的示例，请参见 。

此 pod 声明端口 80 的侦听“web”端点。

  1. {
  2.    "id":"/pod-with-endpoint",
  3.    "containers":[
  4.       {
  5.          "name":"simple-docker",
  6.          "resources":{
  7.             "cpus":1,
  8.             "mem":128,
  9.             "disk":0,
  10.             "gpus":0
  11.          },
  12.          "image":{
  13.             "kind":"DOCKER",
  14.             "id":"nginx"
  15.          },
  16.          "endpoints":[
  17.             {
  18.                "name":"web",
  19.                "containerPort":80,
  20.                "protocol":[
  21.                   "http"
  22.                ]
  23.             }
  24.          ]
  25.       }
  26.    ],
  27.    "networks":[
  28.       {
  29.          "mode":"container"
  30.       }
  31.    ]
  32. }

此 pod 添加引用了 web 端点的运行状况检查。Mesos 将根据 <container_ip>:80 执行 HTTP 请求。如果 Mesos 收到 HTTP 200 响应，则会通过运行状况检查。

完成 Pod

  1. {
  2.   "id": "/complete-pod",
  3.   "labels": {
  4.     "owner": "zeus",
  5.     "note": "Away from olympus"
  6.   },
  7.   "environment": {
  8.     "XPS1": "Test"
  9.   },
  10.   "volumes": [
  11.     {
  12.       "name": "etc",
  13.       "host": "/etc"
  14.     }
  15.   ],
  16.   "networks": [
  17.     {
  18.      "mode": "container",
  19.      "name": "dcos"
  20.     }
  21.   ],
  22.   "scaling": {
  23.     "kind": "fixed",
  24.     "instances": 1
  25.   },
  26.   "scheduling": {
  27.     "backoff": {
  28.       "backoff": 1,
  29.       "backoffFactor": 1.15,
  30.       "maxLaunchDelaySeconds": 300
  31.     },
  32.     "upgrade": {
  33.       "minimumHealthCapacity": 1,
  34.       "maximumOverCapacity": 1
  35.     },
  36.     "placement": {
  37.       "constraints": [],
  38.       "acceptedResourceRoles": []
  39.     }
  40.   },
  41.   "containers": [
  42.     {
  43.       "name": "container1",
  44.       "resources": {
  45.         "cpus": 1,
  46.         "mem": 128,
  47.         "disk": 0,
  48.         "gpus": 0
  49.       },
  50.       "endpoints": [
  51.         {
  52.           "name": "http-endpoint",
  53.           "containerPort": 80,
  54.           "hostPort": 0,
  55.           "protocol": [ "HTTP" ],
  56.           "labels": {}
  57.         }
  58.       ],
  59.       "image": {
  60.         "id": "nginx:latest",
  61.         "kind": "DOCKER",
  62.         "forcePull": false
  63.       },
  64.       "environment": {
  65.         "XPS1": "Test"
  66.       },
  67.       "user": "root",
  68.       "healthCheck": {
  69.         "gracePeriodSeconds": 30,
  70.         "intervalSeconds": 5,
  71.         "maxConsecutiveFailures": 3,
  72.         "timeoutSeconds": 4,
  73.         "delaySeconds": 2,
  74.         "http": {
  75.           "path": "/",
  76.           "scheme": "HTTP",
  77.           "endpoint": "http-endpoint"
  78.         }
  79.       },
  80.       "volumeMounts": [
  81.         {
  82.           "name": "etc",
  83.           "mountPath": "/mnt/etc",
  84.           "readOnly": true
  85.         }
  86.       ],
  87.       "artifacts": [
  88.         {
  89.           "uri": "https://ftp.gnu.org/gnu/glibc/glibc-2.25.tar.gz",
  90.           "executable": false,
  91.           "extract": true,
  92.           "cache": true,
  93.           "destPath": "glibc-2.25.tar.gz"
  94.         }
  95.       ],
  96.       "labels": {
  97.         "owner": "zeus",
  98.         "note": "Away from olympus"
  99.       },
  100.       "lifecycle": {
  101.         "killGracePeriodSeconds": 60
  102.       }
  103.     }