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.          "resourceLimits":{
  24.             "cpus": "unlimited",
  25.             "mem": 1024
  26.          },
  27.          "endpoints":[
  28.             {
  29.                "name":"httpendpoint",
  30.                "containerPort":8080,
  31.                "hostPort":0,
  32.                "protocol":[
  33.                   "tcp"
  34.                ],
  35.                "labels":{
  36.                   "ep1_label":"ep1"
  37.                }
  38.             }
  39.          ],
  40.          "image":{
  41.             "kind":"DOCKER",
  42.             "id":"python:3.5.2-alpine"
  43.          },
  44.          "environment":{
  45.             "C1_ENV":"c1"
  46.          },
  47.          "healthCheck":{
  48.             "http":{
  49.                "endpoint":"httpendpoint",
  50.                "path":"/ping",
  51.                "scheme":"HTTP"
  52.             },
  53.             "gracePeriodSeconds":30,
  54.             "intervalSeconds":5,
  55.             "maxConsecutiveFailures":3,
  56.             "timeoutSeconds":3,
  57.             "delaySeconds":2
  58.          },
  59.          "volumeMounts":[
  60.             {
  61.                "name":"sharedvolume",
  62.                "mountPath":"mount1"
  63.             }
  64.          ],
  65.          "artifacts":[
  66.             {
  67.                "uri":"https://s3-us-west-2.amazonaws.com/mesos-soak-cluster/read-write-server.py",
  68.                "extract":false,
  69.                "executable":true,
  70.                "cache":true,
  71.                "destPath":"read-write-server.py"
  72.             }
  73.          ],
  74.          "labels":{
  75.             "c1_label":"c1"
  76.          }
  77.       },
  78.       {
  79.          "name":"healthtask2",
  80.          "exec":{
  81.             "command":{
  82.                "shell":"./read-write-server.py 8081 mount2/test-file.txt"
  83.             }
  84.          },
  85.          "resources":{
  86.             "cpus":0.1,
  87.             "mem":32,
  88.             "disk":32,
  89.             "gpus":0
  90.          },
  91.          "endpoints":[
  92.             {
  93.                "name":"httpendpoint2",
  94.                "containerPort":8081,
  95.                "hostPort":0,
  96.                "protocol":[
  97.                   "tcp"
  98.                ],
  99.                "labels":{
  100.                   "ep2_label":"ep2"
  101.                }
  102.             }
  103.          ],
  104.          "image":{
  105.             "kind":"DOCKER",
  106.             "id":"python:3.5.2-alpine"
  107.          },
  108.          "environment":{
  109.             "C2_ENV":"c2"
  110.          },
  111.          "healthCheck":{
  112.             "http":{
  113.                "endpoint":"httpendpoint2",
  114.                "path":"/ping",
  115.                "scheme":"HTTP"
  116.             },
  117.             "gracePeriodSeconds":30,
  118.             "intervalSeconds":5,
  119.             "maxConsecutiveFailures":3,
  120.             "timeoutSeconds":3,
  121.             "delaySeconds":2
  122.          },
  124.             {
  125.                "name":"sharedvolume",
  126.                "mountPath":"mount2"
  127.             }
  128.          ],
  129.          "artifacts":[
  130.             {
  131.                "uri":"https://s3-us-west-2.amazonaws.com/mesos-soak-cluster/read-write-server.py",
  132.                "extract":false,
  133.                "executable":true,
  134.                "cache":true,
  135.                "destPath":"read-write-server.py"
  136.             }
  137.          ],
  138.          "labels":{
  139.             "c2_label":"c2"
  140.          }
  141.       {
  142.          "name":"clienttask",
  143.          "exec":{
  144.             "command":{
  145.                "shell":"while true; do sleep 5 && curl -X GET localhost:8080/write && curl -X GET localhost:8081/read; done"
  146.             }
  147.          },
  148.          "resources":{
  149.             "cpus":0.1,
  150.             "mem":32,
  151.             "disk":32,
  152.             "gpus":0
  153.          },
  154.          "endpoints":[
  156.          ],
  157.          "environment":{
  158.             "C3_ENV":"c3"
  159.          },
  160.          "volumeMounts":[
  162.          ],
  163.          "artifacts":[
  165.          ],
  166.          "labels":{
  167.             "c3_label":"c3"
  168.          }
  169.       }
  170.    ],
  171.    "secrets":{
  173.    },
  174.    "volumes":[
  175.       {
  176.          "name":"sharedvolume"
  177.       }
  178.    ],
  179.    "networks":[
  180.       {
  181.          "name":"dcos",
  182.          "mode":"container",
  183.          "labels":{
  184.             "net_label":"net"
  185.          }
  186.       }
  187.    ],
  188.    "scaling":{
  189.       "kind":"fixed",
  190.       "instances":1,
  191.       "maxInstances":null
  192.    },
  193.    "scheduling":{
  194.       "backoff":{
  195.          "backoff":1,
  196.          "backoffFactor":1.15,
  197.          "maxLaunchDelaySeconds":300
  198.       },
  199.       "upgrade":{
  200.          "minimumHealthCapacity":1,
  201.          "maximumOverCapacity":1
  202.       },
  203.       "placement":{
  204.          "constraints":[
  206.          ],
  207.          "acceptedResourceRoles":[
  209.          ]
  210.       },
  211.       "killSelection":"YOUNGEST_FIRST",
  212.       "unreachableStrategy":{
  213.          "inactiveAfterSeconds":900,
  214.          "expungeAfterSeconds":604800
  215.       }
  216.    },
  217.    "executorResources":{
  218.       "cpus":0.1,
  219.       "mem":32,
  220.       "disk":10
  221.    }
  222. }

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.       "maximumOverCapacity": 1
  70.     },
  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 创建具有本地持久卷的 pod.

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 执行 HTTP 请求。<container_ip>:80. 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.       "resourceLimits": {
  51.         "cpus": "unlimited",
  52.         "mem": 1024
  53.       },
  54.       "endpoints": [
  55.         {
  56.           "name": "http-endpoint",
  57.           "containerPort": 80,
  58.           "hostPort": 0,
  59.           "protocol": [ "HTTP" ],
  60.           "labels": {}
  61.         }
  62.       ],
  63.       "image": {
  64.         "id": "nginx:latest",
  65.         "kind": "DOCKER",
  66.         "forcePull": false
  67.       },
  68.       "environment": {
  69.         "XPS1": "Test"
  70.       },
  71.       "user": "root",
  72.       "healthCheck": {
  73.         "gracePeriodSeconds": 30,
  74.         "intervalSeconds": 5,
  75.         "maxConsecutiveFailures": 3,
  76.         "timeoutSeconds": 4,
  77.         "delaySeconds": 2,
  78.         "http": {
  79.           "path": "/",
  80.           "scheme": "HTTP",
  81.           "endpoint": "http-endpoint"
  82.         }
  83.       },
  84.       "volumeMounts": [
  85.         {
  86.           "name": "etc",
  87.           "mountPath": "/mnt/etc",
  88.           "readOnly": true
  89.         }
  90.       ],
  91.       "artifacts": [
  92.         {
  93.           "uri": "https://ftp.gnu.org/gnu/glibc/glibc-2.25.tar.gz",
  94.           "executable": false,
  95.           "extract": true,
  96.           "cache": true,
  97.           "destPath": "glibc-2.25.tar.gz"
  98.         }
  99.       ],
  100.       "labels": {
  101.         "owner": "zeus",
  102.         "note": "Away from olympus"
  103.       },
  104.       "lifecycle": {
  105.         "killGracePeriodSeconds": 60
  106.       }
  107.     }
  109. }