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Namespce 개요

  • 단일 클러스터 내에서의 리소스 그룹 격리 메커니즘

https://stacksimplify.com/azure-aks/azure-kubernetes-service-namespaces-imperative/

Initial Namespaces

  • default (defalut)
    • namespce를 생성하지 않고도 새 클러스터를 사용 할 수 있다.
  • kube-node-lease
    • 각 노드와 연관된 Lease 오브젝트
    • Noe Lease는 kublet이 HeartBeat를 보내서 ControlPlane이 Node의 장애를 탐지할 수 있게 한다.
  • kube-public
    • 모든 클라이언트가 읽기 권한으로 접근 할 수 있다.
  • kube-system
    • kubernetes시스템에서 생성한 오프젝트


 sansae@sansaeAir15m2 k8s-lab-workspace % k get ns
NAME              STATUS   AGE
aks-command       Active   45h
calico-system     Active   2d1h
default           Active   2d1h
kube-node-lease   Active   2d1h
kube-public       Active   2d1h
kube-system       Active   2d1h
tigera-operator   Active   2d1h


kube-system 
sansae@sansaeAir15m2 k8s-lab-workspace % k get all -n kube-system
NAME                                      READY   STATUS    RESTARTS       AGE
pod/ama-logs-j7qth                        3/3     Running   0              3h10m
pod/ama-logs-rs-5ff7974589-dm4bb          2/2     Running   0              3h10m
pod/ama-metrics-5c788bc657-6vbhm          2/2     Running   1 (3h7m ago)   3h10m
pod/ama-metrics-ksm-645c45cb94-4wh8m      1/1     Running   2 (3h9m ago)   3h10m
pod/ama-metrics-node-wwhf9                2/2     Running   1 (3h8m ago)   3h10m
pod/cloud-node-manager-jnjmr              1/1     Running   0              3h10m
pod/coredns-789789675-8vrmw               1/1     Running   0              3h10m
pod/coredns-789789675-prdpm               1/1     Running   0              3h8m
pod/coredns-autoscaler-649b947bbd-bhblb   1/1     Running   0              3h10m
pod/csi-azuredisk-node-vnkwq              3/3     Running   0              3h10m
pod/csi-azurefile-node-t8694              3/3     Running   0              3h10m
pod/konnectivity-agent-f9b696ddb-76cqd    1/1     Running   0              3h10m
pod/konnectivity-agent-f9b696ddb-l444h    1/1     Running   0              3h8m
pod/kube-proxy-v58v6                      1/1     Running   0              3h10m
pod/metrics-server-5fffcb8954-pw8qp       2/2     Running   0              3h5m
pod/metrics-server-5fffcb8954-r2p85       2/2     Running   0              3h5m

NAME                      TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)         AGE
service/ama-metrics-ksm   ClusterIP   10.0.177.113   <none>        8080/TCP        2d1h
service/kube-dns          ClusterIP   10.0.0.10      <none>        53/UDP,53/TCP   2d1h
service/metrics-server    ClusterIP   10.0.135.169   <none>        443/TCP         2d1h

NAME                                        DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR   AGE
daemonset.apps/ama-logs                     1         1         1       1            1           <none>          2d1h
daemonset.apps/ama-logs-windows             0         0         0       0            0           <none>          2d1h
daemonset.apps/ama-metrics-node             1         1         1       1            1           <none>          2d1h
daemonset.apps/ama-metrics-win-node         0         0         0       0            0           <none>          2d1h
daemonset.apps/cloud-node-manager           1         1         1       1            1           <none>          2d1h
daemonset.apps/cloud-node-manager-windows   0         0         0       0            0           <none>          2d1h
daemonset.apps/csi-azuredisk-node           1         1         1       1            1           <none>          2d1h
daemonset.apps/csi-azuredisk-node-win       0         0         0       0            0           <none>          2d1h
daemonset.apps/csi-azurefile-node           1         1         1       1            1           <none>          2d1h
daemonset.apps/csi-azurefile-node-win       0         0         0       0            0           <none>          2d1h
daemonset.apps/kube-proxy                   1         1         1       1            1           <none>          2d1h

NAME                                 READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/ama-logs-rs          1/1     1            1           2d1h
deployment.apps/ama-metrics          1/1     1            1           2d1h
deployment.apps/ama-metrics-ksm      1/1     1            1           2d1h
deployment.apps/coredns              2/2     2            2           2d1h
deployment.apps/coredns-autoscaler   1/1     1            1           2d1h
deployment.apps/konnectivity-agent   2/2     2            2           2d1h
deployment.apps/metrics-server       2/2     2            2           2d1h

NAME                                            DESIRED   CURRENT   READY   AGE
replicaset.apps/ama-logs-rs-5ff7974589          1         1         1       2d1h
replicaset.apps/ama-metrics-5c788bc657          1         1         1       2d1h
replicaset.apps/ama-metrics-ksm-645c45cb94      1         1         1       2d1h
replicaset.apps/coredns-789789675               2         2         2       2d1h
replicaset.apps/coredns-autoscaler-649b947bbd   1         1         1       2d1h
replicaset.apps/konnectivity-agent-79b5c44dc5   0         0         0       2d1h
replicaset.apps/konnectivity-agent-f9b696ddb    2         2         2       2d
replicaset.apps/metrics-server-5bd48455f4       0         0         0       2d1h
replicaset.apps/metrics-server-5fffcb8954       2         2         2       37h
replicaset.apps/metrics-server-84d99f9b8        0         0         0       3h12m
sansae@sansaeAir15m2 k8s-lab-workspace %

Namespace Manifest

namespace.yaml
apiVersion: v1
kind: Namespace
metadata:
  name: applications


Namespace 실습


sansae@sansaeAir15m2 k8s-lab-workspace % k apply -f namespace.yaml 
namespace/applications created

sansae@sansaeAir15m2 k8s-lab-workspace % k get ns
NAME              STATUS   AGE
aks-command       Active   45h
applications      Active   3s
calico-system     Active   2d1h
default           Active   2d1h
kube-node-lease   Active   2d1h
kube-public       Active   2d1h
kube-system       Active   2d1h
tigera-operator   Active   2d1h

sansae@sansaeAir15m2 k8s-lab-workspace % k run busybox --image=busybox -n applications
pod/busybox created

sansae@sansaeAir15m2 k8s-lab-workspace % k get all -n applications
NAME      READY   STATUS             RESTARTS     AGE
busybox   0/1     CrashLoopBackOff   1 (2s ago)   9s
sansae@sansaeAir15m2 k8s-lab-workspace %



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