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안녕하세요 이웃님들 ^.^
좋은 아침 입니다.
오늘은 쿠버네티스 환경에서 KUBECTL을 사용하지 않고 crul을 사용해 API에 접근 하는
방법에 대해서 포스팅 해보겠습니다.
우선 API에 접근 하기 위해선 API의 정보를 알아야 겠죠?
그럼 아래의 절차대로 실행을 해서 API정보를 알아 볼까요?
1) 우선 Kubectl의 설정 정보를 확인 합니다.
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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.key여기서 아래 부분을 별도 메모해 놓으세요.
- 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) 다음 노드 정보를 아래와 같이 조회 합니다.
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:~$여기서 version값을 확인 하세요.
그럼 이제 위에서 확인한 값을 이용해서 아래와 같이 API에 접속을 해보겠습니다.
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.key
아래는 결과 값입니다.
{
"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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