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Hello neighbors ^.^
Good morning to you.
Today, I'm going to use crul to access the API without using KUBECTL in the Kubernetes environment
I'll post about how to do it.
First of all, in order to access the API, we need to know the information of the API, right?
Then, shall we follow the procedure below to find out the API information?
1) First, check the configuration information of Kubectl.
ubuntu@ip-172-31-31-84:~$ cat ~/.kube/config
apiVersion: v1
clusters:
- cluster:
certificate-authority: /home/ubuntu/.minikube/ca.crt
extensions:
- extension:
last-update: Sat, 02 Mar 2024 10:34:20 UTC
provider: minikube.sigs.k8s.io
version: v1.28.0
name: cluster_info
server: https://172.31.31.84:8443
name: minikube
contexts:
- context:
cluster: minikube
extensions:
- extension:
last-update: Sat, 02 Mar 2024 10:34:20 UTC
provider: minikube.sigs.k8s.io
version: v1.28.0
name: context_info
namespace: default
user: minikube
name: minikube
current-context: minikube
kind: Config
preferences: {}
users:
- name: minikube
user:
client-certificate: /home/ubuntu/.minikube/profiles/minikube/client.crt
client-key: /home/ubuntu/.minikube/profiles/minikube/client.key반응형
Take a separate note of the bottom here.
- clusters.cluster.server: https://172.31.31.84:8443
- clusters.cluster.certificate-authority: /home/ubuntu/.minikube/ca.crt
- users.user.client-certificate: /home/ubuntu/.minikube/profiles/minikube/client.crt
- users.user.client-key: /home/ubuntu/.minikube/profiles/minikube/client.key
2) Inquire the following node information as follows.
ubuntu@ip-172-31-31-84:~$ kubectl explain node
KIND: Node
VERSION: v1
DESCRIPTION:
Node is a worker node in Kubernetes. Each node will have a unique
identifier in the cache (i.e. in etcd).
FIELDS:
apiVersion <string>
APIVersion defines the versioned schema of this representation of an
object. Servers should convert recognized schemas to the latest internal
value, and may reject unrecognized values. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources
kind <string>
Kind is a string value representing the REST resource this object
represents. Servers may infer this from the endpoint the client submits
requests to. Cannot be updated. In CamelCase. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
metadata <Object>
Standard object's metadata. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
spec <Object>
Spec defines the behavior of a node.
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
status <Object>
Most recently observed status of the node. Populated by the system.
Read-only. More info:
https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status
ubuntu@ip-172-31-31-84:~$
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Check the version value here.
Then, I will use the values checked above to access the API as below.
curl https://172.31.31.84:8443/api/v1/nodes --cacert /home/ubuntu/.minikube/ca.crt --cert /home/ubuntu/.minikube/profiles/minikube/client.crt --key /home/ubuntu/.minikube/profiles/minikube/client.keyBelow are the results.
{
"kind": "NodeList",
"apiVersion": "v1",
"metadata": {
"resourceVersion": "1123"
},
"items": [
{
"metadata": {
"name": "ip-172-31-31-84",
"uid": "f9f408d5-cfc6-4b04-933c-1f025f403a4d",
"resourceVersion": "892",
"creationTimestamp": "2024-03-02T10:34:16Z",
"labels": {
"beta.kubernetes.io/arch": "amd64",
"beta.kubernetes.io/os": "linux",
"kubernetes.io/arch": "amd64",
"kubernetes.io/hostname": "ip-172-31-31-84",
"kubernetes.io/os": "linux",
"minikube.k8s.io/commit": "986b1ebd987211ed16f8cc10aed7d2c42fc8392f",
"minikube.k8s.io/name": "minikube",
"minikube.k8s.io/primary": "true",
"minikube.k8s.io/updated_at": "2024_03_02T10_34_20_0700",
"minikube.k8s.io/version": "v1.28.0",
"node-role.kubernetes.io/control-plane": "",
"node-role.kubernetes.io/master": "",
"node.kubernetes.io/exclude-from-external-load-balancers": ""
},
"annotations": {
"kubeadm.alpha.kubernetes.io/cri-socket": "/var/run/dockershim.sock",
"node.alpha.kubernetes.io/ttl": "0",
"volumes.kubernetes.io/controller-managed-attach-detach": "true"
},
"managedFields": [
{
"manager": "Go-http-client",
"operation": "Update",
"apiVersion": "v1",
"time": "2024-03-02T10:34:19Z",
"fieldsType": "FieldsV1",
"fieldsV1": {
"f:metadata": {
"f:annotations": {
".": {},
"f:kubeadm.alpha.kubernetes.io/cri-socket": {},
"f:volumes.kubernetes.io/controller-managed-attach-detach": {}
},
"f:labels": {
".": {},
"f:beta.kubernetes.io/arch": {},
"f:beta.kubernetes.io/os": {},
"f:kubernetes.io/arch": {},
"f:kubernetes.io/hostname": {},
"f:kubernetes.io/os": {},
"f:node-role.kubernetes.io/control-plane": {},
"f:node-role.kubernetes.io/master": {},
"f:node.kubernetes.io/exclude-from-external-load-balancers": {}
}
}
}
},
{
"manager": "kubectl-label",
"operation": "Update",
"apiVersion": "v1",
"time": "2024-03-02T10:34:20Z",
"fieldsType": "FieldsV1",
"fieldsV1": {
"f:metadata": {
"f:labels": {
"f:minikube.k8s.io/commit": {},
"f:minikube.k8s.io/name": {},
"f:minikube.k8s.io/primary": {},
"f:minikube.k8s.io/updated_at": {},
"f:minikube.k8s.io/version": {}
}
}
}
},
{
"manager": "kube-controller-manager",
"operation": "Update",
"apiVersion": "v1",
"time": "2024-03-02T10:34:32Z",
"fieldsType": "FieldsV1",
"fieldsV1": {
"f:metadata": {
"f:annotations": {
"f:node.alpha.kubernetes.io/ttl": {}
}
},
"f:spec": {
"f:podCIDR": {},
"f:podCIDRs": {
".": {},
"v:\"10.244.0.0/24\"": {}
}
}
}
},
{
"manager": "Go-http-client",
"operation": "Update",
"apiVersion": "v1",
"time": "2024-03-02T10:34:51Z",
"fieldsType": "FieldsV1",
"fieldsV1": {
"f:status": {
"f:conditions": {
"k:{\"type\":\"DiskPressure\"}": {
"f:lastHeartbeatTime": {}
},
"k:{\"type\":\"MemoryPressure\"}": {
"f:lastHeartbeatTime": {}
},
"k:{\"type\":\"PIDPressure\"}": {
"f:lastHeartbeatTime": {}
},
"k:{\"type\":\"Ready\"}": {
"f:lastHeartbeatTime": {},
"f:lastTransitionTime": {},
"f:message": {},
"f:reason": {},
"f:status": {}
}
},
"f:images": {}
}
},
"subresource": "status"
}
]
},
"spec": {
"podCIDR": "10.244.0.0/24",
"podCIDRs": [
"10.244.0.0/24"
]
},
"status": {
"capacity": {
"cpu": "2",
"ephemeral-storage": "30297152Ki",
"hugepages-1Gi": "0",
"hugepages-2Mi": "0",
"memory": "8024104Ki",
"pods": "110"
},
"allocatable": {
"cpu": "2",
"ephemeral-storage": "30297152Ki",
"hugepages-1Gi": "0",
"hugepages-2Mi": "0",
"memory": "8024104Ki",
"pods": "110"
},
"conditions": [
{
"type": "MemoryPressure",
"status": "False",
"lastHeartbeatTime": "2024-03-02T10:39:57Z",
"lastTransitionTime": "2024-03-02T10:34:14Z",
"reason": "KubeletHasSufficientMemory",
"message": "kubelet has sufficient memory available"
},
{
"type": "DiskPressure",
"status": "False",
"lastHeartbeatTime": "2024-03-02T10:39:57Z",
"lastTransitionTime": "2024-03-02T10:34:14Z",
"reason": "KubeletHasNoDiskPressure",
"message": "kubelet has no disk pressure"
},
{
"type": "PIDPressure",
"status": "False",
"lastHeartbeatTime": "2024-03-02T10:39:57Z",
"lastTransitionTime": "2024-03-02T10:34:14Z",
"reason": "KubeletHasSufficientPID",
"message": "kubelet has sufficient PID available"
},
{
"type": "Ready",
"status": "True",
"lastHeartbeatTime": "2024-03-02T10:39:57Z",
"lastTransitionTime": "2024-03-02T10:34:31Z",
"reason": "KubeletReady",
"message": "kubelet is posting ready status. AppArmor enabled"
}
],
"addresses": [
{
"type": "InternalIP",
"address": "172.31.31.84"
},
{
"type": "Hostname",
"address": "ip-172-31-31-84"
}
],
"daemonEndpoints": {
"kubeletEndpoint": {
"Port": 10250
}
},
"nodeInfo": {
"machineID": "ec2b0e64d9caf49c013fe5118624adb4",
"systemUUID": "ec2b0e64-d9ca-f49c-013f-e5118624adb4",
"bootID": "d09f992d-f06e-48a9-b4fd-4f64abe232a3",
"kernelVersion": "5.15.0-1055-aws",
"osImage": "Ubuntu 20.04.6 LTS",
"containerRuntimeVersion": "docker://20.10.23",
"kubeletVersion": "v1.23.0",
"kubeProxyVersion": "v1.23.0",
"operatingSystem": "linux",
"architecture": "amd64"
},
"images": [
{
"names": [
"k8s.gcr.io/etcd@sha256:64b9ea357325d5db9f8a723dcf503b5a449177b17ac87d69481e126bb724c263",
"k8s.gcr.io/etcd:3.5.1-0"
],
"sizeBytes": 292558922
},
{
"names": [
"k8s.gcr.io/ingress-nginx/controller@sha256:5516d103a9c2ecc4f026efbd4b40662ce22dc1f824fb129ed121460aaa5c47f8"
],
"sizeBytes": 289315470
},
{
"names": [
"k8s.gcr.io/kube-apiserver@sha256:d10db42c2353539ce15006854edfb6707ba6025f282d59d962729ed3b6039004",
"k8s.gcr.io/kube-apiserver:v1.23.0"
],
"sizeBytes": 135154064
},
{
"names": [
"k8s.gcr.io/kube-controller-manager@sha256:0bfbb13e5e9cec329523b6f654687af8ce058adbc90b42e5af7a929ac22e2a53",
"k8s.gcr.io/kube-controller-manager:v1.23.0"
],
"sizeBytes": 124963795
},
{
"names": [
"k8s.gcr.io/kube-proxy@sha256:2e8292d30042bb75f745d2a90d0fc4fbc3a3b1bdbe5b9d3bf50dd866c62b2ba7",
"k8s.gcr.io/kube-proxy:v1.23.0"
],
"sizeBytes": 112319647
},
{
"names": [
"k8s.gcr.io/metrics-server/metrics-server@sha256:5ddc6458eb95f5c70bd13fdab90cbd7d6ad1066e5b528ad1dcb28b76c5fb2f00"
],
"sizeBytes": 68793965
},
{
"names": [
"k8s.gcr.io/kube-scheduler@sha256:af8166ce28baa7cb902a2c0d16da865d5d7c892fe1b41187fd4be78ec6291c23",
"k8s.gcr.io/kube-scheduler:v1.23.0"
],
"sizeBytes": 53476049
},
{
"names": [
"k8s.gcr.io/ingress-nginx/kube-webhook-certgen@sha256:64d8c73dca984af206adf9d6d7e46aa550362b1d7a01f3a0a91b20cc67868660"
],
"sizeBytes": 47736388
},
{
"names": [
"k8s.gcr.io/coredns/coredns@sha256:5b6ec0d6de9baaf3e92d0f66cd96a25b9edbce8716f5f15dcd1a616b3abd590e",
"k8s.gcr.io/coredns/coredns:v1.8.6"
],
"sizeBytes": 46829283
},
{
"names": [
"gcr.io/k8s-minikube/storage-provisioner@sha256:18eb69d1418e854ad5a19e399310e52808a8321e4c441c1dddad8977a0d7a944",
"gcr.io/k8s-minikube/storage-provisioner:v5"
],
"sizeBytes": 31465472
},
{
"names": [
"k8s.gcr.io/pause@sha256:3d380ca8864549e74af4b29c10f9cb0956236dfb01c40ca076fb6c37253234db",
"k8s.gcr.io/pause:3.6"
],
"sizeBytes": 682696
},
{
"names": [
"hello-world@sha256:d000bc569937abbe195e20322a0bde6b2922d805332fd6d8a68b19f524b7d21d",
"hello-world:latest"
],
"sizeBytes": 13256
}
]
}
}
]
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