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01. 두 개의 nginx 이미지를 사용하는 pod를 생성하고, 각 pod에 label을 추가한다.
pod 생성을 완료한 후 레이블을 확인한다.
[Solve]
[root@k8s-master ~]# vi 2-test.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx1
labels:
env: prod
spec:
containers:
- name: nginx1
image: nginx:1.14.2
ports:
- containerPort: 80
---
apiVersion: v1
kind: Pod
metadata:
name: nginx2
labels:
env: dev
spec:
containers:
- name: nginx2
image: nginx:1.14.2
ports:
- containerPort: 80
[root@k8s-master ~]# kubectl apply -f 2-test.yaml
pod/nginx1 created
pod/nginx2 created
[root@k8s-master ~]# kubectl get pods -l env=pod
No resources found in default namespace.
[root@k8s-master ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
frontend 0/1 CrashLoopBackOff 7 (46s ago) 11m
nginx1 1/1 Running 0 39s
nginx2 1/1 Running 0 39s
[root@k8s-master ~]# kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
frontend 0/1 CrashLoopBackOff 7 (83s ago) 12m <none>
nginx1 1/1 Running 0 76s env=prod
nginx2 1/1 Running 0 76s env=dev
[root@k8s-master ~]#
[root@k8s-master ~]# kubectl get pods -l env=prod
NAME READY STATUS RESTARTS AGE
nginx1 1/1 Running 0 2m56s
[root@k8s-master ~]#
[root@k8s-master ~]# kubectl get pods -l env=dev
NAME READY STATUS RESTARTS AGE
nginx2 1/1 Running 0 3m22s
[root@k8s-master ~]#
02. nginx pod를 생성하고, 다양한 세부 옵션(verbosity)을 이용하여 pod를 조회
[solve]
[root@k8s-master ~]# vi 3-test.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx
spec:
containers:
- name: nginx
image: nginx:1.14.2
ports:
- containerPort: 80
[root@k8s-master ~]# kubectl apply -f 3-test.yaml
pod/nginx created
[root@k8s-master ~]#
[root@k8s-master ~]# kubectl get pods nginx --v=7
I1226 23:30:00.148153 56297 loader.go:373] Config loaded from file: /root/.kube/config
I1226 23:30:00.156782 56297 round_trippers.go:463] GET https://192.168.56.30:6443/api/v1/namespaces/default/pods/nginx
I1226 23:30:00.156800 56297 round_trippers.go:469] Request Headers:
I1226 23:30:00.156808 56297 round_trippers.go:473] Accept: application/json;as=Table;v=v1;g=meta.k8s.io,application/json;as=Table;v=v1beta1;g=meta.k8s.io,application/json
I1226 23:30:00.156815 56297 round_trippers.go:473] User-Agent: kubectl/v1.27.2 (linux/amd64) kubernetes/7f6f68f
I1226 23:30:00.165943 56297 round_trippers.go:574] Response Status: 200 OK in 9 milliseconds
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 112s
[root@k8s-master ~]#
[root@k8s-master ~]# kubectl get pods nginx --v=8
I1226 23:30:08.456517 56382 loader.go:373] Config loaded from file: /root/.kube/config
I1226 23:30:08.463324 56382 round_trippers.go:463] GET https://192.168.56.30:6443/api/v1/namespaces/default/pods/nginx
I1226 23:30:08.463340 56382 round_trippers.go:469] Request Headers:
I1226 23:30:08.463347 56382 round_trippers.go:473] Accept: application/json;as=Table;v=v1;g=meta.k8s.io,application/json;as=Table;v=v1beta1;g=meta.k8s.io,application/json
I1226 23:30:08.463354 56382 round_trippers.go:473] User-Agent: kubectl/v1.27.2 (linux/amd64) kubernetes/7f6f68f
I1226 23:30:08.473071 56382 round_trippers.go:574] Response Status: 200 OK in 9 milliseconds
I1226 23:30:08.473093 56382 round_trippers.go:577] Response Headers:
I1226 23:30:08.473101 56382 round_trippers.go:580] Date: Thu, 26 Dec 2024 14:30:08 GMT
I1226 23:30:08.473110 56382 round_trippers.go:580] Audit-Id: 0ee7c8c1-451e-4a40-89b3-81eb2ed88bf8
I1226 23:30:08.473115 56382 round_trippers.go:580] Cache-Control: no-cache, private
I1226 23:30:08.473125 56382 round_trippers.go:580] Content-Type: application/json
I1226 23:30:08.473164 56382 round_trippers.go:580] X-Kubernetes-Pf-Flowschema-Uid: c2c841d7-6631-4244-8c69-ce28f913005d
I1226 23:30:08.473173 56382 round_trippers.go:580] X-Kubernetes-Pf-Prioritylevel-Uid: 5a9746b8-4334-46a8-b4a6-e5acabecd257
I1226 23:30:08.473319 56382 request.go:1188] Response Body: {"kind":"Table","apiVersion":"meta.k8s.io/v1","metadata":{"resourceVersion":"6798"},"columnDefinitions":[{"name":"Name","type":"string","format":"name","description":"Name must be unique within a namespace. Is required when creating resources, although some resources may allow a client to request the generation of an appropriate name automatically. Name is primarily intended for creation idempotence and configuration definition. Cannot be updated. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names#names","priority":0},{"name":"Ready","type":"string","format":"","description":"The aggregate readiness state of this pod for accepting traffic.","priority":0},{"name":"Status","type":"string","format":"","description":"The aggregate status of the containers in this pod.","priority":0},{"name":"Restarts","type":"string","format":"","description":"The number of times the containers in this pod have been restarted and when the last container in this pod has restarted.","priority":0},{"n [truncated 4445 chars]
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 2m
[root@k8s-master ~]#
[root@k8s-master ~]#
[root@k8s-master ~]# kubectl get pods nginx --v=9
I1226 23:30:12.242609 56389 loader.go:373] Config loaded from file: /root/.kube/config
I1226 23:30:12.251061 56389 round_trippers.go:466] curl -v -XGET -H "User-Agent: kubectl/v1.27.2 (linux/amd64) kubernetes/7f6f68f" -H "Accept: application/json;as=Table;v=v1;g=meta.k8s.io,application/json;as=Table;v=v1beta1;g=meta.k8s.io,application/json" 'https://192.168.56.30:6443/api/v1/namespaces/default/pods/nginx'
I1226 23:30:12.251775 56389 round_trippers.go:510] HTTP Trace: Dial to tcp:192.168.56.30:6443 succeed
I1226 23:30:12.260707 56389 round_trippers.go:553] GET https://192.168.56.30:6443/api/v1/namespaces/default/pods/nginx 200 OK in 9 milliseconds
I1226 23:30:12.260748 56389 round_trippers.go:570] HTTP Statistics: DNSLookup 0 ms Dial 0 ms TLSHandshake 5 ms ServerProcessing 2 ms Duration 9 ms
I1226 23:30:12.260757 56389 round_trippers.go:577] Response Headers:
I1226 23:30:12.260766 56389 round_trippers.go:580] Cache-Control: no-cache, private
I1226 23:30:12.260776 56389 round_trippers.go:580] Content-Type: application/json
I1226 23:30:12.260781 56389 round_trippers.go:580] X-Kubernetes-Pf-Flowschema-Uid: c2c841d7-6631-4244-8c69-ce28f913005d
I1226 23:30:12.260792 56389 round_trippers.go:580] X-Kubernetes-Pf-Prioritylevel-Uid: 5a9746b8-4334-46a8-b4a6-e5acabecd257
I1226 23:30:12.260816 56389 round_trippers.go:580] Date: Thu, 26 Dec 2024 14:30:12 GMT
I1226 23:30:12.260821 56389 round_trippers.go:580] Audit-Id: b5c3177a-6400-4b40-9969-0150951b0829
I1226 23:30:12.260999 56389 request.go:1188] Response Body: {"kind":"Table","apiVersion":"meta.k8s.io/v1","metadata":{"resourceVersion":"6798"},"columnDefinitions":[{"name":"Name","type":"string","format":"name","description":"Name must be unique within a namespace. Is required when creating resources, although some resources may allow a client to request the generation of an appropriate name automatically. Name is primarily intended for creation idempotence and configuration definition. Cannot be updated. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names#names","priority":0},{"name":"Ready","type":"string","format":"","description":"The aggregate readiness state of this pod for accepting traffic.","priority":0},{"name":"Status","type":"string","format":"","description":"The aggregate status of the containers in this pod.","priority":0},{"name":"Restarts","type":"string","format":"","description":"The number of times the containers in this pod have been restarted and when the last container in this pod has restarted.","priority":0},{"name":"Age","type":"string","format":"","description":"CreationTimestamp is a timestamp representing the server time when this object was created. It is not guaranteed to be set in happens-before order across separate operations. Clients may not set this value. It is represented in RFC3339 form and is in UTC.\n\nPopulated by the system. Read-only. Null for lists. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata","priority":0},{"name":"IP","type":"string","format":"","description":"IP address allocated to the pod. Routable at least within the cluster. Empty if not yet allocated.","priority":1},{"name":"Node","type":"string","format":"","description":"NodeName is a request to schedule this pod onto a specific node. If it is non-empty, the scheduler simply schedules this pod onto that node, assuming that it fits resource requirements.","priority":1},{"name":"Nominated Node","type":"string","format":"","description":"nominatedNodeName is set only when this pod preempts other pods on the node, but it cannot be scheduled right away as preemption victims receive their graceful termination periods. This field does not guarantee that the pod will be scheduled on this node. Scheduler may decide to place the pod elsewhere if other nodes become available sooner. Scheduler may also decide to give the resources on this node to a higher priority pod that is created after preemption. As a result, this field may be different than PodSpec.nodeName when the pod is scheduled.","priority":1},{"name":"Readiness Gates","type":"string","format":"","description":"If specified, all readiness gates will be evaluated for pod readiness. A pod is ready when all its containers are ready AND all conditions specified in the readiness gates have status equal to \"True\" More info: https://git.k8s.io/enhancements/keps/sig-network/580-pod-readiness-gates","priority":1}],"rows":[{"cells":["nginx","1/1","Running","0","2m4s","20.96.36.69","k8s-node1","\u003cnone\u003e","\u003cnone\u003e"],"object":{"kind":"PartialObjectMetadata","apiVersion":"meta.k8s.io/v1","metadata":{"name":"nginx","namespace":"default","uid":"127c6479-803e-43c5-9680-319707a6cf8b","resourceVersion":"6798","creationTimestamp":"2024-12-26T14:28:08Z","annotations":{"cni.projectcalico.org/containerID":"c135cf60414be79d4003377f06a871cc04303025d3e0604b1f30395061142c34","cni.projectcalico.org/podIP":"20.96.36.69/32","cni.projectcalico.org/podIPs":"20.96.36.69/32","kubectl.kubernetes.io/last-applied-configuration":"{\"apiVersion\":\"v1\",\"kind\":\"Pod\",\"metadata\":{\"annotations\":{},\"name\":\"nginx\",\"namespace\":\"default\"},\"spec\":{\"containers\":[{\"image\":\"nginx:1.14.2\",\"name\":\"nginx\",\"ports\":[{\"containerPort\":80}]}]}}\n"},"managedFields":[{"manager":"calico","operation":"Update","apiVersion":"v1","time":"2024-12-26T14:28:08Z","fieldsType":"FieldsV1","fieldsV1":{"f:metadata":{"f:annotations":{"f:cni.projectcalico.org/containerID":{},"f:cni.projectcalico.org/podIP":{},"f:cni.projectcalico.org/podIPs":{}}}},"subresource":"status"},{"manager":"kubectl-client-side-apply","operation":"Update","apiVersion":"v1","time":"2024-12-26T14:28:08Z","fieldsType":"FieldsV1","fieldsV1":{"f:metadata":{"f:annotations":{".":{},"f:kubectl.kubernetes.io/last-applied-configuration":{}}},"f:spec":{"f:containers":{"k:{\"name\":\"nginx\"}":{".":{},"f:image":{},"f:imagePullPolicy":{},"f:name":{},"f:ports":{".":{},"k:{\"containerPort\":80,\"protocol\":\"TCP\"}":{".":{},"f:containerPort":{},"f:protocol":{}}},"f:resources":{},"f:terminationMessagePath":{},"f:terminationMessagePolicy":{}}},"f:dnsPolicy":{},"f:enableServiceLinks":{},"f:restartPolicy":{},"f:schedulerName":{},"f:securityContext":{},"f:terminationGracePeriodSeconds":{}}}},{"manager":"kubelet","operation":"Update","apiVersion":"v1","time":"2024-12-26T14:28:17Z","fieldsType":"FieldsV1","fieldsV1":{"f:status":{"f:conditions":{"k:{\"type\":\"ContainersReady\"}":{".":{},"f:lastProbeTime":{},"f:lastTransitionTime":{},"f:status":{},"f:type":{}},"k:{\"type\":\"Initialized\"}":{".":{},"f:lastProbeTime":{},"f:lastTransitionTime":{},"f:status":{},"f:type":{}},"k:{\"type\":\"Ready\"}":{".":{},"f:lastProbeTime":{},"f:lastTransitionTime":{},"f:status":{},"f:type":{}}},"f:containerStatuses":{},"f:hostIP":{},"f:phase":{},"f:podIP":{},"f:podIPs":{".":{},"k:{\"ip\":\"20.96.36.69\"}":{".":{},"f:ip":{}}},"f:startTime":{}}},"subresource":"status"}]}}}]}
NAME READY STATUS RESTARTS AGE
nginx 1/1 Running 0 2m4s
[root@k8s-master ~]#
verbosity란?
https://kubernetes.io/docs/reference/kubectl/quick-reference/
03. 특정 namespace의 pod를 찾아서 한 줄에 한개씩 이름만 출력하고 이것을 파일로 저장한다.
[precondition]
: 특정 namespace와 해당 namespace에 속한 pod를 먼저 생성한다.
[root@k8s-master ~]# kubectl create namespace development
namespace/development created
[root@k8s-master ~]# vi 11-test.yaml
[root@k8s-master ~]# kubectl apply -f 11-test.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: icandor
namespace: development
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.14.2
ports:
- containerPort: 80
deployment.apps/icandor created
[root@k8s-master ~]# kubectl get pods -n development
NAME READY STATUS RESTARTS AGE
icandor-cbdccf466-5mtg7 1/1 Running 0 50s
icandor-cbdccf466-m5wqf 1/1 Running 0 50s
icandor-cbdccf466-swdwb 1/1 Running 0 50s
[solve]
: 파일을 생성할 위치는 미리 만들어둔다.
[root@k8s-master ~]# kubectl get pods -n development -o name
pod/icandor-cbdccf466-5mtg7
pod/icandor-cbdccf466-m5wqf
pod/icandor-cbdccf466-swdwb
[root@k8s-master ~]# mkdir /opt/KUCC00302
[root@k8s-master ~]# kubectl get pods -n development -o name > /opt/KUCC00302/kucc00302.txt
[root@k8s-master ~]# cat /opt/KUCC00302/kucc00302.txt
pod/icandor-cbdccf466-5mtg7
pod/icandor-cbdccf466-m5wqf
pod/icandor-cbdccf466-swdwb
[root@k8s-master ~]#
04. persistent volume의 capacity로 sorting한다. 해당 정보를 특정 파일로 저장한다.
[precondition]
capacity가 다른 3개의 persistent volume을 생성
[root@k8s-master ~]# vi 13-test.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv0003-01
spec:
capacity:
storage: 5Gi
volumeMode: Filesystem
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle
storageClassName: slow
mountOptions:
- hard
- nfsvers=4.1
nfs:
path: /tmp
server: 172.17.0.2
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv0003-02
spec:
capacity:
storage: 2Gi
volumeMode: Filesystem
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle
storageClassName: slow
mountOptions:
- hard
- nfsvers=4.1
nfs:
path: /tmp
server: 172.17.0.2
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: pv0003-03
spec:
capacity:
storage: 10Gi
volumeMode: Filesystem
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle
storageClassName: slow
mountOptions:
- hard
- nfsvers=4.1
nfs:
path: /tmp
server: 172.17.0.2
[root@k8s-master ~]# kubectl apply -f 13-test.yaml
persistentvolume/pv0003-01 created
persistentvolume/pv0003-02 created
persistentvolume/pv0003-03 created
[root@k8s-master ~]#
[solve]
[root@k8s-master ~]# kubectl get pv --sort-by=.spec.capacity.storage
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv0003-02 2Gi RWO Recycle Available slow 5m44s
pv0003-01 5Gi RWO Recycle Available slow 5m44s
pv0003-03 10Gi RWO Recycle Available slow 5m44s
[root@k8s-master ~]# mkdir /opt/KUCC00102
[root@k8s-master ~]# kubectl get pv --sort-by=.spec.capacity.storage > /opt/KUCC00102/volume_list
[root@k8s-master ~]# cat /opt/KUCC00102/volume_list
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pv0003-02 2Gi RWO Recycle Available slow 7m45s
pv0003-01 5Gi RWO Recycle Available slow 7m45s
pv0003-03 10Gi RWO Recycle Available slow 7m45s
[root@k8s-master ~]#05. describe 명령어를 사용하지 말고 pod의 image 버전을 확인한다.
[solve]
[root@k8s-master ~]# kubectl get pods -o=jsonpath='{range .items[*]}{.spec.containers..image}{"\t"}{"\n"}{end}'
gcr.io/google-samples/hello-app:2.0
busybox:1.28
alpine:latest
nginx:1.14.2 redis memcached
nginx:1.14.2
nginx:1.14.2
nginx:1.14.2
nginx:1.14.2
nginx:1.14.2
nginx:1.14.2
nginx:1.14.2
nginx:1.14.2
nginx:1.14.2
redis
[root@k8s-master ~]#06. pod name과 start time을 특정 파일로 저장한다.
[solve]
[root@k8s-master ~]# kubectl get pods -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.startTime}{"\n"}{end}'
env-pod 2024-12-26T14:48:30Z
foo 2024-12-26T15:55:24Z
frontend 2024-12-26T14:05:48Z
kucc8 2024-12-26T18:16:53Z
nginx 2024-12-26T16:26:23Z
nginx-deployment-cbdccf466-4k8t8 2024-12-26T18:41:38Z
nginx-deployment-cbdccf466-6nqjr 2024-12-26T16:37:50Z
nginx-deployment-cbdccf466-bjtj5 2024-12-26T18:41:38Z
nginx-deployment-cbdccf466-nsp68 2024-12-26T16:43:48Z
nginx-deployment-cbdccf466-wf8gk 2024-12-26T16:37:55Z
nginx-deployment-cbdccf466-xx9hr 2024-12-26T18:41:33Z
nginx1 2024-12-26T14:16:59Z
nginx2 2024-12-26T14:16:59Z
non-persistent-redis 2024-12-26T16:19:09Z
[root@k8s-master ~]#
[root@k8s-master ~]# kubectl get pods -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.startTime}{"\n"}{end}' > /opt/pod-status
[root@k8s-master ~]# cat /opt/pod-status
env-pod 2024-12-26T14:48:30Z
foo 2024-12-26T15:55:24Z
frontend 2024-12-26T14:05:48Z
kucc8 2024-12-26T18:16:53Z
nginx 2024-12-26T16:26:23Z
nginx-deployment-cbdccf466-4k8t8 2024-12-26T18:41:38Z
nginx-deployment-cbdccf466-6nqjr 2024-12-26T16:37:50Z
nginx-deployment-cbdccf466-bjtj5 2024-12-26T18:41:38Z
nginx-deployment-cbdccf466-nsp68 2024-12-26T16:43:48Z
nginx-deployment-cbdccf466-wf8gk 2024-12-26T16:37:55Z
nginx-deployment-cbdccf466-xx9hr 2024-12-26T18:41:33Z
nginx1 2024-12-26T14:16:59Z
nginx2 2024-12-26T14:16:59Z
non-persistent-redis 2024-12-26T16:19:09Z
[root@k8s-master ~]#07. 특정 pod의 ip address를 확인한다.
[solve]
[root@k8s-master ~]# kubectl get pods -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.podIP}{"\n"}{end}'
env-pod 20.96.169.133
foo 20.96.36.72
frontend 20.96.169.130
kucc8 20.96.36.79
nginx 20.96.36.74
nginx-deployment-cbdccf466-4k8t8 20.96.169.139
nginx-deployment-cbdccf466-6nqjr 20.96.36.75
nginx-deployment-cbdccf466-bjtj5 20.96.169.140
nginx-deployment-cbdccf466-nsp68 20.96.36.76
nginx-deployment-cbdccf466-wf8gk 20.96.169.137
nginx-deployment-cbdccf466-xx9hr 20.96.36.80
nginx1 20.96.169.132
nginx2 20.96.169.131
non-persistent-redis 20.96.36.73
[root@k8s-master ~]# kubectl get pods -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.podIP}{"\n"}{end}'| grep kucc8
kucc8 20.96.36.79
[root@k8s-master ~]#08. pod를 이름순으로 정렬한다.
[solve]
[root@k8s-master ~]# kubectl get pods --sort-by=.metadata.name
NAME READY STATUS RESTARTS AGE
env-pod 1/1 Running 0 5h17m
foo 1/1 Running 4 (10m ago) 4h11m
frontend 0/1 CrashLoopBackOff 75 (53s ago) 6h
kucc8 3/3 Running 0 109m
nginx 1/1 Running 0 3h40m
nginx1 1/1 Running 0 5h49m
nginx2 1/1 Running 0 5h49m
nginx-deployment-cbdccf466-4k8t8 1/1 Running 0 85m
nginx-deployment-cbdccf466-6nqjr 1/1 Running 0 3h28m
nginx-deployment-cbdccf466-bjtj5 1/1 Running 0 85m
nginx-deployment-cbdccf466-nsp68 1/1 Running 0 3h22m
nginx-deployment-cbdccf466-wf8gk 1/1 Running 0 3h28m
nginx-deployment-cbdccf466-xx9hr 1/1 Running 0 85m
non-persistent-redis 1/1 Running 0 3h47m
[root@k8s-master ~]#09. pod 리스트를 custom columns을 이용하여 출력한다.
[solve]
[root@k8s-master ~]# kubectl get pods -o=custom-columns="POD_NAME:.metadata.name,POD_STATUS:.status.phase"
POD_NAME POD_STATUS
env-pod Running
foo Running
frontend Running
kucc8 Running
nginx Running
nginx-deployment-cbdccf466-4k8t8 Running
nginx-deployment-cbdccf466-6nqjr Running
nginx-deployment-cbdccf466-bjtj5 Running
nginx-deployment-cbdccf466-nsp68 Running
nginx-deployment-cbdccf466-wf8gk Running
nginx-deployment-cbdccf466-xx9hr Running
nginx1 Running
nginx2 Running
non-persistent-redis Running
[root@k8s-master ~]#10. pod 리스트를 생성한 timestamp로 정렬해서 출력한다.
[solve]
[root@k8s-master ~]# kubectl get pods --sort-by=.metadata.creationTimestamp
NAME READY STATUS RESTARTS AGE
frontend 0/1 CrashLoopBackOff 83 (109s ago) 6h42m
nginx2 1/1 Running 0 6h31m
nginx1 1/1 Running 0 6h31m
env-pod 1/1 Running 0 6h
foo 1/1 Running 4 (53m ago) 4h53m
non-persistent-redis 1/1 Running 0 4h29m
nginx 1/1 Running 0 4h22m
nginx-deployment-cbdccf466-wf8gk 1/1 Running 0 4h11m
nginx-deployment-cbdccf466-6nqjr 1/1 Running 0 4h11m
nginx-deployment-cbdccf466-nsp68 1/1 Running 0 4h5m
kucc8 3/3 Running 0 151m
nginx-deployment-cbdccf466-bjtj5 1/1 Running 0 127m
nginx-deployment-cbdccf466-xx9hr 1/1 Running 0 127m
nginx-deployment-cbdccf466-4k8t8 1/1 Running 0 127m
[root@k8s-master ~]#11. 특정 조건의 node의 수를 파일로 저장한다.
조건 1 : ready 상태의 node
조건 2 : taint, noschedule 설정이 없을 것
[solve]
[root@k8s-master ~]# kubectl describe nodes | grep -i taints
Taints: node-role.kubernetes.io/control-plane:NoSchedule
Taints: <none>
Taints: <none>
[root@k8s-master ~]# kubectl describe nodes | grep -i taints | grep -i noschedule
Taints: node-role.kubernetes.io/control-plane:NoSchedule
[root@k8s-master ~]#
[root@k8s-master ~]# echo 2 > /opt/KUSC00402/kusc0042.txt
[root@k8s-master ~]# cat /opt/KUSC00402/kusc0042.txt
2
[root@k8s-master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master Ready control-plane 7h18m v1.27.2
k8s-node1 Ready <none> 7h1m v1.27.2
k8s-node2 Ready <none> 7h1m v1.27.2
[root@k8s-master ~]#12. 모든 namespace의 pod를 출력하고 특정 파일로 작성한다.
[solve]
[root@k8s-master ~]# kubectl get pods -A
NAMESPACE NAME READY STATUS RESTARTS AGE
calico-apiserver calico-apiserver-574c754579-2kfx6 1/1 Running 0 32m
calico-apiserver calico-apiserver-574c754579-t5fdm 1/1 Running 0 32m
calico-system calico-kube-controllers-bf6cb6475-bhbm9 1/1 Running 0 32m
calico-system calico-node-6pfjk 1/1 Running 0 7h22m
calico-system calico-node-pf4s2 1/1 Running 0 7h6m
calico-system calico-node-tzkh8 1/1 Running 0 7h6m
calico-system calico-typha-6cb494cb8d-5h2tz 1/1 Running 0 7h6m
calico-system calico-typha-6cb494cb8d-sjr8l 1/1 Running 0 29m
calico-system csi-node-driver-4mfcs 2/2 Running 0 7h6m
calico-system csi-node-driver-969dd 2/2 Running 0 7h6m
calico-system csi-node-driver-gfpv7 2/2 Running 0 7h22m
default env-pod 1/1 Running 0 6h15m
default foo 1/1 Running 5 (8m10s ago) 5h8m
default frontend 0/1 CrashLoopBackOff 86 (89s ago) 6h57m
default kucc8 3/3 Running 0 167m
default nginx 1/1 Running 0 4h37m
default nginx-deployment-cbdccf466-4k8t8 1/1 Running 0 142m
default nginx-deployment-cbdccf466-6nqjr 1/1 Running 0 4h26m
default nginx-deployment-cbdccf466-bjtj5 1/1 Running 0 142m
default nginx-deployment-cbdccf466-nsp68 1/1 Running 0 4h20m
default nginx-deployment-cbdccf466-wf8gk 1/1 Running 0 4h26m
default nginx-deployment-cbdccf466-xx9hr 1/1 Running 0 142m
default nginx1 1/1 Running 0 6h46m
default nginx2 1/1 Running 0 6h46m
default non-persistent-redis 1/1 Running 0 4h44m
development icandor-cbdccf466-5mtg7 1/1 Running 0 4h13m
development icandor-cbdccf466-m5wqf 1/1 Running 0 4h13m
development icandor-cbdccf466-swdwb 1/1 Running 0 4h13m
kube-system coredns-5d78c9869d-8fpgb 1/1 Running 0 32m
kube-system coredns-5d78c9869d-ns9qz 1/1 Running 0 32m
kube-system etcd-k8s-master 1/1 Running 0 7h23m
kube-system kube-apiserver-k8s-master 1/1 Running 0 7h23m
kube-system kube-controller-manager-k8s-master 1/1 Running 0 7h23m
kube-system kube-proxy-f7z9m 1/1 Running 0 7h6m
kube-system kube-proxy-jv7xk 1/1 Running 0 7h6m
kube-system kube-proxy-xhtzx 1/1 Running 0 7h23m
kube-system kube-scheduler-k8s-master 1/1 Running 0 7h23m
kube-system metrics-server-7db4fb59f9-rkw72 1/1 Running 0 5h39m
kubernetes-dashboard dashboard-metrics-scraper-5cb4f4bb9c-9wnc5 1/1 Running 0 5h39m
kubernetes-dashboard kubernetes-dashboard-6bc7c98694-7zrqz 1/1 Running 0 5h39m
tigera-operator tigera-operator-84cf9b6dbb-brtdt 1/1 Running 0 32m
[root@k8s-master ~]#
[root@k8s-master ~]#
[root@k8s-master ~]#
[root@k8s-master ~]#
[root@k8s-master ~]# kubectl get pods -A > /opt/pods-list.yaml
[root@k8s-master ~]# cat /opt/pods-list.yaml
NAMESPACE NAME READY STATUS RESTARTS AGE
calico-apiserver calico-apiserver-574c754579-2kfx6 1/1 Running 0 33m
calico-apiserver calico-apiserver-574c754579-t5fdm 1/1 Running 0 33m
calico-system calico-kube-controllers-bf6cb6475-bhbm9 1/1 Running 0 33m
calico-system calico-node-6pfjk 1/1 Running 0 7h23m
calico-system calico-node-pf4s2 1/1 Running 0 7h7m
calico-system calico-node-tzkh8 1/1 Running 0 7h7m
calico-system calico-typha-6cb494cb8d-5h2tz 1/1 Running 0 7h7m
calico-system calico-typha-6cb494cb8d-sjr8l 1/1 Running 0 30m
calico-system csi-node-driver-4mfcs 2/2 Running 0 7h7m
calico-system csi-node-driver-969dd 2/2 Running 0 7h7m
calico-system csi-node-driver-gfpv7 2/2 Running 0 7h23m
default env-pod 1/1 Running 0 6h16m
default foo 1/1 Running 5 (9m10s ago) 5h9m
default frontend 0/1 CrashLoopBackOff 86 (2m29s ago) 6h58m
default kucc8 3/3 Running 0 168m
default nginx 1/1 Running 0 4h38m
default nginx-deployment-cbdccf466-4k8t8 1/1 Running 0 143m
default nginx-deployment-cbdccf466-6nqjr 1/1 Running 0 4h27m
default nginx-deployment-cbdccf466-bjtj5 1/1 Running 0 143m
default nginx-deployment-cbdccf466-nsp68 1/1 Running 0 4h21m
default nginx-deployment-cbdccf466-wf8gk 1/1 Running 0 4h27m
default nginx-deployment-cbdccf466-xx9hr 1/1 Running 0 143m
default nginx1 1/1 Running 0 6h47m
default nginx2 1/1 Running 0 6h47m
default non-persistent-redis 1/1 Running 0 4h45m
development icandor-cbdccf466-5mtg7 1/1 Running 0 4h14m
development icandor-cbdccf466-m5wqf 1/1 Running 0 4h14m
development icandor-cbdccf466-swdwb 1/1 Running 0 4h14m
kube-system coredns-5d78c9869d-8fpgb 1/1 Running 0 33m
kube-system coredns-5d78c9869d-ns9qz 1/1 Running 0 33m
kube-system etcd-k8s-master 1/1 Running 0 7h24m
kube-system kube-apiserver-k8s-master 1/1 Running 0 7h24m
kube-system kube-controller-manager-k8s-master 1/1 Running 0 7h24m
kube-system kube-proxy-f7z9m 1/1 Running 0 7h7m
kube-system kube-proxy-jv7xk 1/1 Running 0 7h7m
kube-system kube-proxy-xhtzx 1/1 Running 0 7h24m
kube-system kube-scheduler-k8s-master 1/1 Running 0 7h24m
kube-system metrics-server-7db4fb59f9-rkw72 1/1 Running 0 5h40m
kubernetes-dashboard dashboard-metrics-scraper-5cb4f4bb9c-9wnc5 1/1 Running 0 5h40m
kubernetes-dashboard kubernetes-dashboard-6bc7c98694-7zrqz 1/1 Running 0 5h40m
tigera-operator tigera-operator-84cf9b6dbb-brtdt 1/1 Running 0 33m
[root@k8s-master ~]#13. pod list를 jsonpath 형식으로 name, namespace가 보여지도록 확인한다.
[solve]
[root@k8s-master ~]# kubectl get pods -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.namespace}{"\n"}{end}'
dnsutils default
env-pod default
foo default
frontend default
kucc8 default
nginx default
nginx-deployment-cbdccf466-4k8t8 default
nginx-deployment-cbdccf466-6nqjr default
nginx-deployment-cbdccf466-bjtj5 default
nginx-deployment-cbdccf466-nsp68 default
nginx-deployment-cbdccf466-wf8gk default
nginx-deployment-cbdccf466-xx9hr default
nginx1 default
nginx2 default
non-persistent-redis default
[root@k8s-master ~]#
14. 특정 pod의 이미지 버전을 확인한다. jsonpath를 이용한다.
[solve]
[root@k8s-master ~]# kubectl get pods -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.spec.containers..image}{"\n"}{end}' | grep -i nginx-deployment
nginx-deployment-cbdccf466-hg9bw nginx:1.14.2
nginx-deployment-cbdccf466-kpt85 nginx:1.14.2
nginx-deployment-cbdccf466-ldggc nginx:1.14.2
nginx-deployment-cbdccf466-rswc7 nginx:1.14.2
nginx-deployment-cbdccf466-t8zb8 nginx:1.14.2
nginx-deployment-cbdccf466-xphn5 nginx:1.14.2
[root@k8s-master ~]#
반응형
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