I see the following event from kubectl get events:
{
"apiVersion": "v1",
"count": 1,
"eventTime": null,
"firstTimestamp": "2019-12-04T19:52:51Z",
"involvedObject": {
"apiVersion": "v1",
"kind": "Pod",
"name": "example-deployment-55f789d54c-tlwnz",
"namespace": "default",
"resourceVersion": "82663",
"uid": "2fdbd034-16cf-11ea-bc4a-42010a800186"
},
"kind": "Event",
"lastTimestamp": "2019-12-04T19:52:51Z",
"message": "Unable to mount volumes for pod \"example-deployment-55f789d54c-tlwnz_default(2fdbd034-16cf-11ea-bc4a-42010a800186)\": timeout expired waiting for volumes to attach or mount for pod \"default\"/\"example-deployment-55f789d54c-tlwnz\". list of unmounted volumes=[nfs-volume]. list of unattached volumes=[nfs-volume default-token-kc7ks]",
"metadata": {
"creationTimestamp": "2019-12-04T19:52:51Z",
"name": "example-deployment-55f789d54c-tlwnz.15dd430deb31e8fd",
"namespace": "default",
"resourceVersion": "1529",
"selfLink": "/api/v1/namespaces/default/events/example-deployment-55f789d54c-tlwnz.15dd430deb31e8fd",
"uid": "a7c80266-16cf-11ea-bc4a-42010a800186"
},
"reason": "FailedMount",
"reportingComponent": "",
"reportingInstance": "",
"source": {
"component": "kubelet",
"host": "gke-test-a2e50ea5b9f1dd9-my-node-pool-5a20b1ac-vk9q"
},
"type": "Warning"
}
....
I've tried filtering by: kubectl get events --all-namespaces -o json --field-selector source.component=cluster-autoscaler but that errors with:
{
"apiVersion": "v1",
"items": [],
"kind": "List",
"metadata": {
"resourceVersion": "",
"selfLink": ""
}
}
Error from server (BadRequest): Unable to find "/v1, Resource=events" that match label selector "", field selector "source.component=cluster-autoscaler": field label not supported: source.component
How can I filter this?
Can be done using jq (though it does not return a JSON array - but individual JSON objects seperated by newlines):
kubectl get events --all-namespaces -o json | jq '.items[]|select(.source.component=="cluster-autoscaler")'
Related
I am new to json query. Facing trouble extracting the status.conditions[ansibleResult].type
I have a CRD defined and created CR against the same, which is picked up by operator-sdk running ansible in the background. I am updating the CRD to provide relevant status once CR is accepted and processed by operator-sdk.
CR output in json appears like below.
{
"apiVersion": "vault.cpe.oraclecloud.com/v1alpha1",
"kind": "OciVaultKeys",
"metadata": {
"annotations": {
"kubectl.kubernetes.io/last-applied-configuration": "{\"apiVersion\":\"vault.cpe.oraclecloud.com/v1alpha1\",\"kind\":\"OciVaultKeys\",\"metadata\":{\"annotations\":{},\"name\":\"operator-key-broken\",\"namespace\":\"tms\"},\"spec\":{\"freeformTags\":[{\"key\":\"Type\",\"value\":\"Optional-Values-Added\"}],\"ociVaultKeyName\":\"operator-key-broken\",\"ociVaultKeyShapeAlgorithm\":\"RSA\",\"ociVaultKeyShapeLength\":32,\"ociVaultName\":\"ocivault-sample-12\"}}\n"
},
"creationTimestamp": "2022-03-18T07:43:03Z",
"finalizers": [
"vault.cpe.oraclecloud.com/finalizer"
],
"generation": 1,
"name": "operator-key-broken",
"namespace": "tms",
"resourceVersion": "717880023",
"selfLink": "/apis/vault.cpe.oraclecloud.com/v1alpha1/namespaces/tms/ocivaultkeys/operator-key-broken",
"uid": "0d634e72-f592-48e0-be9b-ebfa017b2dfe"
},
"spec": {
"freeformTags": [
{
"key": "Type",
"value": "Optional-Values-Added"
}
],
"ociVaultKeyName": "operator-key-broken",
"ociVaultKeyShapeAlgorithm": "RSA",
"ociVaultKeyShapeLength": 32,
"ociVaultName": "ocivault-sample-12"
},
"status": {
"conditions": [
{
"lastTransitionTime": "2022-03-18T07:43:27Z",
"message": "",
"reason": "",
"status": "False",
"type": "Successful"
},
{
"lastTransitionTime": "2022-03-18T08:26:08Z",
"message": "Running reconciliation",
"reason": "Running",
"status": "False",
"type": "Running"
},
{
"ansibleResult": {
"changed": 0,
"completion": "2022-03-18T08:26:24.217728",
"failures": 1,
"ok": 14,
"skipped": 1
},
"lastTransitionTime": "2022-03-18T08:26:25Z",
"message": "The task includes an option with an undefined variable. The error was: No first item, sequence was empty.\n\nThe error appears to be in '/home/opc/cpe-workstation/mr_folder/workspace-2/osvc-kubernetes-operators/oci-services/roles/ocivaultkeys/tasks/fetch_vault_details_oci.yml': line 12, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: DEBUG | Fetch Vault Details | Extract Vault OCID n service_endpoint in source region\n ^ here\n",
"reason": "Failed",
"status": "True",
"type": "Failure"
}
]
}
}
I wish to reliably extract the status.conditions[].type (for the element ansibleResult) in CRD.
CRD definition extract is as below
- name: v1alpha1
served: true
storage: true
additionalPrinterColumns:
- description: 'Status of the OCI Vault Key'
jsonPath: .status.conditions[-1].type
name: STATUS
type: string
priority: 0
CRD is looking for a jsonPath expression to extract.
Thanks
Please try following :
kubectl get ocivaultkeys operator-key-broken -o jsonpath='{.status.conditions[?(#.ansibleResult)].type}'
Expected output : Failure
jsonpath help
When using kubectl get -o yaml/json to obtain resource information, the output content is too detailed, how to obtain the specified part of the content?
[root#ops-harbor ~]# kubectl get -n monitoring prometheus-prome-prometheus-operator-prometheus-0 -ojson
{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"creationTimestamp": "2021-11-02T08:58:33Z",
"generateName": "prometheus-prome-prometheus-operator-prometheus-",
"labels": {
"app": "prometheus",
"controller-revision-hash": "prometheus-prome-prometheus-operator-prometheus-c56894959",
"prometheus": "prome-prometheus-operator-prometheus",
"statefulset.kubernetes.io/pod-name": "prometheus-prome-prometheus-operator-prometheus-0"
},
"name": "prometheus-prome-prometheus-operator-prometheus-0",
"namespace": "monitoring",
"ownerReferences": [
{
"apiVersion": "apps/v1",
"blockOwnerDeletion": true,
"controller": true,
"kind": "StatefulSet",
"name": "prometheus-prome-prometheus-operator-prometheus",
"uid": "3c02e78b-610c-4e9c-9171-cc47b00274a3"
}
],
"resourceVersion": "2640925",
"selfLink": "/api/v1/namespaces/monitoring/pods/prometheus-prome-prometheus-operator-prometheus-0",
"uid": "e728914c-2a3c-4d6a-8a18-5ebec0e0cebd"
},
# ...long long content
For example, I only want to get the following 2 sections of information.
"apiVersion": "v1",
"kind": "Pod",
"ownerReferences": [
{
"apiVersion": "apps/v1",
"blockOwnerDeletion": true,
"controller": true,
"kind": "StatefulSet",
"name": "prometheus-prome-prometheus-operator-prometheus",
"uid": "3c02e78b-610c-4e9c-9171-cc47b00274a3"
}
kubectl get pod -n monitoring prometheus-prome-prometheus-operator-prometheus-0 -o json | jq .metadata.ownerReferences
or
kubectl get pod -n monitoring prometheus-prome-prometheus-operator-prometheus-0 -o jsonpath={.metadata.ownerReferences} | jq
I am trying to get the podname from the pod json using the command which is returning the error
kgp -o jsonpath="{.items[*].metadata[?(#.labels.module=='ddvv-script')].name}"
Error
is not array or slice and cannot be filtered. Printing more information for debugging the template:
template was:
{.items[*].metadata[?(#.labels.module=='ddvv-script')].name}
object given to jsonpath engine was:
Sample file
{
"apiVersion": "v1",
"items": [
{
"apiVersion": "v1",
"kind": "Pod",
"metadata": {
"creationTimestamp": "2020-09-18T17:42:50Z",
"generateName": "ddvv-script-6b784db6bd-",
"labels": {
"app": "my-configs",
"lf.module": "ddvv-script",
"module": "ddvv-script",
"pod-template-hash": "6b784db6bd",
"release": "config"
},
"name": "ddvv-script-6b784db6bd-rjtgh",
What is wrong with this command
You can use below command. It gets podname of pods which has label module=ddvv-script
kubectl get pods --selector=module=ddvv-script --output=jsonpath={.items..metadata.name}
kgp -o jsonpath="{.items[*].metadata[?(#.labels.module=='ddvv-script')].name}"
should be
kgp -o jsonpath="{.items[?(#.metadata.labels.module=='ddvv-script')].metadata.name}"
I can get all the things of a list of objects, such as Secrets and ConfigMaps.
{
"kind": "SecretList",
"apiVersion": "v1",
"metadata": {
"selfLink": "/api/v1/namespaces/kube-system/secrets",
"resourceVersion": "499638"
},
"items": [{
"metadata": {
"name": "aaa",
"namespace": "kube-system",
"selfLink": "/api/v1/namespaces/kube-system/secrets/aaa",
"uid": "96b0fbee-f14c-423d-9734-53fed20ae9f9",
"resourceVersion": "1354",
"creationTimestamp": "2020-02-24T11:20:23Z"
},
"data": "aaa"
}]
}
but I only want the name list, for this example :"aaa". Is there any way?
Yes, you can achieve it by using jsonpath output. Note that the specification you posted will look quite differently once applied. It will create one Secret object in your kube-system namespace and when you run:
$ kubectl get secret -n kube-system aaa -o json
the output will look similar to the following:
{
"apiVersion": "v1",
"kind": "Secret",
"metadata": {
"creationTimestamp": "2020-02-25T11:08:21Z",
"name": "aaa",
"namespace": "kube-system",
"resourceVersion": "34488887",
"selfLink": "/api/v1/namespaces/kube-system/secrets/aaa",
"uid": "229edeb3-57bf-11ea-b366-42010a9c0093"
},
"type": "Opaque"
}
To get only the name of your Secret you need to run:
kubectl get secret aaa -n kube-system -o jsonpath='{.metadata.name}'
i think this should work.
kubectl get secretlist -o=jsonpath="{.items[*].metadata.name]}" | grep -v HEAD | head -n1
check link in the below for more info.
https://kubernetes.io/docs/reference/kubectl/jsonpath/
I'm trying to write a go template that extracts the value of the load balancer. Using --go-template={{status.loadBalancer.ingress}} returns [map[hostname:GUID.us-west-2.elb.amazonaws.com]]% When I add .hostname to the template I get an error saying, "can't evaluate field hostname in type interface {}". I've tried using the range keyword, but I can't seem to get the syntax right.
{
"apiVersion": "v1",
"kind": "Service",
"metadata": {
"creationTimestamp": "2018-07-30T17:22:12Z",
"labels": {
"run": "nginx"
},
"name": "nginx-http",
"namespace": "jx",
"resourceVersion": "495789",
"selfLink": "/api/v1/namespaces/jx/services/nginx-http",
"uid": "18aea6e2-941d-11e8-9c8a-0aae2cf24842"
},
"spec": {
"clusterIP": "10.100.92.49",
"externalTrafficPolicy": "Cluster",
"ports": [
{
"nodePort": 31032,
"port": 80,
"protocol": "TCP",
"targetPort": 8080
}
],
"selector": {
"run": "nginx"
},
"sessionAffinity": "None",
"type": "LoadBalancer"
},
"status": {
"loadBalancer": {
"ingress": [
{
"hostname": "GUID.us-west-2.elb.amazonaws.com"
}
]
}
}
}
As you can see from the JSON, the ingress element is an array. You can use the template function index to grab this array element.
Try:
kubectl get svc <name> -o=go-template --template='{{(index .status.loadBalancer.ingress 0 ).hostname}}'
This is assuming of course that you're only provisioning a single loadbalancer, if you have multiple, you'll have to use range
try this:
kubectl get svc <name> -o go-template='{{range .items}}{{range .status.loadBalancer.ingress}}{{.hostname}}{{printf "\n"}}{{end}}{{end}}'