쟝이의 세상
Kubernetes(label, namespace) 본문
📌 Label
💡 label
: 각 아이템마다 붙여진 속성, 한 객체당 원하는 만큼의 label을 붙일 수 있다.
✔️pod 설정 yaml 파일
apiVersion: v1 kind: Pod metadata: name: simple-webapp labels: key1: value1 key2: value2 # label은 원하는 만큼 작성 가능 spec: containers: - name: [컨테이너이름지정] image: [이미지] ports: - containerPort: 8080
✔️ yaml 파일을 통한 label 속성 설정
[root@k8smaster ~]# cd lab
[root@k8smaster lab]# cd 03
[root@k8smaster 03]# ls
custom-namespace.yaml guestbook-liveness-probe.yaml guestbook-manual.yaml
guestbook-gpu.yaml guestbook-manual-custom-namespace.yaml
guestbook-liveness-probe-initial-delay.yaml guestbook-manual-with-labels.yaml
[root@k8smaster 03]# kubectl create -f guestbook-manual-with-labels.yaml
[root@k8smaster 03]# kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
guestbook-manual 1/1 Terminating 0 3h55m <none>
guestbook-manual-v2 0/1 Pending 0 27s creation_method=manual,env=prodguestbook-manual-v2 이름의 파드가 생성된 것을 볼 수 있고, 뒤에 label 속성이 같이 생성된 것을 알 수 있다.
(yaml 파일의 내용에 의해 생성된 것임)
👇🏻 guestbook-manual-with-labels.yaml 파일 확인
더보기
더보기
guestbook-manual-with-labels.yaml
apiVersion: v1
kind: Pod
metadata:
name: guestbook-manual-v2
labels:
creation_method: manual
env: prod
spec:
containers:
- image: yu3papa/k8s_guestbook:1.0
name: guestbook
ports:
- containerPort: 8080
protocol: TCP✔️ 수동으로 label 속성 설정
[root@k8smaster 03]# kubectl label pod guestbook-manual creation_method=manual env=prod
pod/guestbook-manual labeled
[root@k8smaster 03]# kubectl get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
guestbook-manual 1/1 Terminating 0 3h59m creation_method=manual,env=prod
guestbook-manual-v2 0/1 Pending 0 4m31s creation_method=manual,env=prod명령어로 guestbook-manual 파드에 label을 수동으로 설정
✔️ replicaSet과 label의 관계
[root@k8smaster 04]# kubectl get pods
NAME READY STATUS RESTARTS AGE
guestbook-2qd45 1/1 Running 0 56m
guestbook-79qj5 1/1 Running 0 56m
guestbook-8rkp8 1/1 Running 0 41m
guestbook-cc2sm 1/1 Running 0 56m
guestbook-dv6gc 1/1 Running 0 41m
[root@k8smaster 04]# kubectl label po guestbook-2qd45 app=guest --overwrite
pod/guestbook-2qd45 labeled👇🏻 결과 출력
더보기
더보기
[root@k8smaster 04]# k get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
guestbook-2qd45 1/1 Running 0 57m app=guest
guestbook-79qj5 1/1 Running 0 57m app=guestbook
guestbook-8rkp8 1/1 Running 0 42m app=guestbook
guestbook-cc2sm 1/1 Running 0 57m app=guestbook
guestbook-dv6gc 1/1 Running 0 42m app=guestbook
guestbook-k6q7b 1/1 Running 0 8s app=guestbookreplicaSet은 label을 보고 만든다는 것을 확인할 수 있다.
✔️ label을 통해 pod 삭제
[root@k8smaster 04]# k delete pods -l app=tree
pod "guestbook-2z6lc" deleted👇🏻 결과 출력
더보기
더보기
[root@k8smaster 04]# k get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
guestbook-7r2zp 1/1 Running 0 26s app=guestbook
guestbook-cfd2h 1/1 Running 0 5m52s app=guestbook
guestbook-g9mxr 1/1 Running 0 7m23s app=guestbook
guestbook-jc4cw 1/1 Running 0 7m23s app=guestbook
guestbook-m4257 1/1 Running 0 7m23s app=guestbook
📌 Namespace
💡 Namespace
: kubernetes에서 생성해 온 object들
(pod, deployment, service들은 클러스터 내 namespace 안에 구성됨)
✔️ namespace 생성
kubectl create namespace [네임스페이스 이름]
✔️ namespace 설정된 pod 확인해보기
[root@k8smaster 03]# kubectl get namespaces
NAME STATUS AGE
default Active 276d
kube-node-lease Active 276d
kube-public Active 276d
kube-system Active 276d
kubernetes-dashboard Active 45h
[root@k8smaster 03]# kubectl get pod --namespace=kube-system -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
calico-kube-controllers-7c968b5878-8w2m5 1/1 Running 3 (6h3m ago) 276d 10.98.16.140 k8smaster <none> <none>
calico-node-2q72n 0/1 Running 4 (6h3m ago) 276d 192.168.56.100 k8smaster <none> <none>
calico-node-dhs52 1/1 Running 7 (6h3m ago) 276d 192.168.56.101 k8snode1 <none> <none>
coredns-5dd5756b68-lxcrj 1/1 Running 3 (6h3m ago) 276d 10.98.16.139 k8smaster <none> <none>
coredns-5dd5756b68-wbs6p 1/1 Running 3 (6h3m ago) 276d 10.98.16.138 k8smaster <none> <none>
etcd-k8smaster 1/1 Running 4 (6h3m ago) 276d 192.168.56.100 k8smaster <none> <none>
kube-apiserver-k8smaster 1/1 Running 4 (6h3m ago) 276d 192.168.56.100 k8smaster <none> <none>
kube-controller-manager-k8smaster 1/1 Running 4 (6h3m ago) 276d 192.168.56.100 k8smaster <none> <none>
kube-proxy-j4dsf 1/1 Running 4 (6h3m ago) 276d 192.168.56.100 k8smaster <none> <none>
kube-proxy-s59th 1/1 Running 7 (6h3m ago) 276d 192.168.56.101 k8snode1 <none> <none>
kube-scheduler-k8smaster 1/1 Running 4 (6h3m ago) 276d 192.168.56.100 k8smaster <none> <none>
metrics-server-6d857ffdc9-4jpk7 1/1 Terminating 1 (6h3m ago) 45h 10.102.249.11 k8snode1 <none> <none>
metrics-server-6d857ffdc9-wlzdl 0/1 Pending 0 46m <none> <none> <none> <none>
metrics-server-75bf97fcc9-tlhvm 0/1 Terminating 1 (6h3m ago) 45h 10.102.249.14 k8snode1 <none> <none>
metrics-server-75bf97fcc9-x74lh 0/1 Pending 0 46m <none> <none> <none> <none>
✔️ yaml 파일을 통한 namespace 생성
[root@k8smaster 03]# kubectl create -f custom-namespace.yaml
namespace/custom-namespace created
[root@k8smaster 03]# kubectl get ns
NAME STATUS AGE
custom-namespace Active 5s
default Active 276d
kube-node-lease Active 276d
kube-public Active 276d
kube-system Active 276d
kubernetes-dashboard Active 45h
👇🏻 custom-namespace.yaml 파일 확인
✔️ yaml 파일을 통한 pod 생성(namespace 설정)
[root@k8smaster 03]# kubectl create -f guestbook-manual.yaml -n custom-namespace
pod/guestbook-manual created
[root@k8smaster 03]# kubectl get pods -n custom-namespace
NAME READY STATUS RESTARTS AGE
guestbook-manual 0/1 Pending 0 17s👇🏻 guestbook-manual.yaml 파일 확인
더보기
더보기
guestbook-manual.yaml
apiVersion: v1
kind: Pod
metadata:
name: guestbook-manual
spec:
containers:
- image: yu3papa/k8s_guestbook:1.0
name: guestbook
ports:
- containerPort: 8080
protocol: TCP
📌 Namespace 실습
| 미션1. 네임스페이스 생성: shopping-mall deployment로 파드 생성 : guestbook --> 조회 --> 복제본 3개 --> 조회 --> 복제본 개수를 5개로 조정 --> 조회 --> service 생성(guestbook-http) |
[root@k8smaster 03]# kubectl create namespace shopping-mall
namespace/shopping-mall created
[root@k8smaster 03]# kubectl get namespace
NAME STATUS AGE
custom-namespace Active 21m
default Active 276d
kube-node-lease Active 276d
kube-public Active 276d
kube-system Active 276d
kubernetes-dashboard Active 45h
shopping-mall Active 9s
[root@k8smaster 03]# docker images
REPOSITORY TAG IMAGE ID CREATED PLATFORM SIZE BLOB SIZE
ubuntu 24.04 dfc10878be8d 2 days ago linux/amd64 81.0 MiB 28.4 MiB
yu3papa/mysql_hangul 2.0 887eb3c63fd4 9 months ago linux/amd64 359.1 MiB 116.9 MiB
zyange/k8s_guestbook 1.0 2851c231a65e 2 days ago linux/amd64 554.4 MiB 246.5 MiB
[root@k8smaster 03]# kubectl create deployment guestbook --image=zyange/k8s_guestbook:1.0 --port=8080 -n shopping-mall
deployment.apps/guestbook created
[root@k8smaster 03]# kubectl get deployment -n shopping-mall
NAME READY UP-TO-DATE AVAILABLE AGE
guestbook 0/1 1 0 19s
[root@k8smaster 03]# kubectl scale deployment guestbook --replicas=3 -n shopping-mall
deployment.apps/guestbook scaled
[root@k8smaster 03]# kubectl get deployment -n shopping-mall NAME READY UP-TO-DATE AVAILABLE AGE
guestbook 0/3 3 0 9m1s
[root@k8smaster 03]# kubectl scale deployment guestbook --replicas=5 -n shopping-mall
deployment.apps/guestbook scaled
[root@k8smaster 03]# kubectl get deployment -n shopping-mall
NAME READY UP-TO-DATE AVAILABLE AGE
guestbook 0/5 5 0 9m9s
[root@k8smaster 03]# kubectl expose deployment guestbook --type=LoadBalancer --name guestbook-http -n shopping-mall
service/guestbook-http exposed
[root@k8smaster 03]# kubectl get service -n shopping-mall
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
guestbook-http LoadBalancer 10.104.235.83 <pending> 8080:31167/TCP 4s'수업내용' 카테고리의 다른 글
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