如何从注释对象中提取Kubernestes豆荚mac地址

Question

我试图使用json过滤器中的kubectl或jq来提取metadata.annotations下的mac或ips地址。其他对象很容易操作以获得这些值。

kubectl在注释下得到po -o json -n multus_jq -r .items，有复制的CNI信息，但没关系。我喜欢使用jq提取那些MAC地址。这件事似乎很棘手。

[
  {
    "apiVersion": "v1",
    "kind": "Pod",
    "metadata": {
      "annotations": {
        "k8s.v1.cni.cncf.io/network-status": "[{\n    \"name\": \"eps-cni\",\n    \"ips\": [\n        \"172.31.83.216\"\n    ],\n    \"default\": true,\n    \"dns\": {}\n},{\n    \"name\": \"ipvlan1-busybox1\",\n    \"interface\": \"net1\",\n    \"ips\": [\n        \"172.31.230.70\"\n    ],\n    \"mac\": \"0a:2d:40:c6:f8:ea\",\n    \"dns\": {}\n},{\n    \"name\": \"ipvlan2-busybox1\",\n    \"interface\": \"net2\",\n    \"ips\": [\n        \"172.31.232.70\"\n    ],\n    \"mac\": \"0a:52:8a:62:5d:f4\",\n    \"dns\": {}\n}]",
        "k8s.v1.cni.cncf.io/networks": "ipvlan1-busybox1, ipvlan2-busybox1",
        "k8s.v1.cni.cncf.io/networks-status": "[{\n    \"name\": \"eps-cni\",\n    \"ips\": [\n        \"172.31.83.216\"\n    ],\n    \"default\": true,\n    \"dns\": {}\n},{\n    \"name\": \"ipvlan1-busybox1\",\n    \"interface\": \"net1\",\n    \"ips\": [\n        \"172.31.230.70\"\n    ],\n    \"mac\": \"0a:2d:40:c6:f8:ea\",\n    \"dns\": {}\n},{\n    \"name\": \"ipvlan2-busybox1\",\n    \"interface\": \"net2\",\n    \"ips\": [\n        \"172.31.232.70\"\n    ],\n    \"mac\": \"0a:52:8a:62:5d:f4\",\n    \"dns\": {}\n}]",
        "kubernetes.io/psp": "eps.privileged"
      },
      "creationTimestamp": "2020-05-24T17:09:10Z",
      "generateName": "busybox1-f476958bd-",
      "labels": {
        "app": "busybox",
        "pod-template-hash": "f476958bd"
      },
      "name": "busybox1-f476958bd-hds4w",
      "namespace": "multus",
      "ownerReferences": [
        {
          "apiVersion": "apps/v1",
          "blockOwnerDeletion": true,
          "controller": true,
          "kind": "ReplicaSet",
          "name": "busybox1-f476958bd",
          "uid": "5daf9b52-e1b3-4df7-b5a1-028b48e7fcc0"
        }
      ],
      "resourceVersion": "965176",
      "selfLink": "/api/v1/namespaces/multus/pods/busybox1-f476958bd-hds4w",
      "uid": "0051b85d-9774-4f89-8658-f34065222bf0"
    },

for basic jq，

[root@ip-172-31-103-214 ~]# kubectl get po -o json -n multus|jq -r '.items[] | .spec.volumes'
[
  {
    "name": "test-busybox1-token-f6bdj",
    "secret": {
      "defaultMode": 420,
      "secretName": "test-busybox1-token-f6bdj"
    }
  }
]

我可以切换到yaml格式，然后使用普通的grep。

kubectl get po -o yaml  -n multus|egrep 'mac'|sort -u
"mac": "0a:2d:40:c6:f8:ea",
"mac": "0a:52:8a:62:5d:f4",

谢谢

Answer 1

从原始JSON开始，使用jq的-r命令行选项，以下jq过滤器产生如下输出：

.[]
| .metadata.annotations[]
| (fromjson? // empty)
| .[]
| select(has("mac"))
| {mac}

输出：

{"mac":"0a:2d:40:c6:f8:ea"}
{"mac":"0a:52:8a:62:5d:f4"}
{"mac":"0a:2d:40:c6:f8:ea"}
{"mac":"0a:52:8a:62:5d:f4"}

Answer 2

请尝试下面的命令，并得到预期的输出。

cat abc.json | jq -r  '.metadata.annotations."k8s.v1.cni.cncf.io/networks-status" | fromjson | .[].mac ' 

abc.json是你儿子的档案。