| rs : ReplicaSet --> replicas개수만큼 파드가 생성 rc: ReplicationController --> 구형의 리소스 특징 : labelSelector의 내용과 레이블, 문제점 : templete의 이미지가 변경되어도 제대로 생성 안됨 create : 없는 객체를 생성 apply : 없으면 생성, 있으면 업데이트 |
* 레플리케이션컨트롤러 생성
[root@k8smaster 03]# cd ~/lab/04
[root@k8smaster 04]# ls
batch-job guestbook-replicaset-matchexpressions.yaml ssd-monitor
batch-job.yaml guestbook-replicaset.yaml ssd-monitor-daemonset.yaml
cronjob.yaml multi-completion-batch-job.yaml
guestbook-rc.yaml multi-completion-parallel-batch-job.yaml
[root@k8smaster 04]# kubectl create -f guestbook-rc.yaml
replicationcontroller/guestbook created
[root@k8smaster 04]# k get rc
NAME DESIRED CURRENT READY AGE
guestbook 3 3 3 8s
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-2kxdf 1/1 Running 0 16s
guestbook-ck5rz 1/1 Running 0 16s
guestbook-v5dj9 1/1 Running 0 16s
[root@k8smaster 04]# vi guestbook-rc.yaml -> 수정
-> replicas를 5로 변경
# replicas를 5개로 변경
[root@k8smaster 04]# vi guestbook-rc.yaml
[root@k8smaster 04]# k apply -f guestbook-rc.yaml
Warning: resource replicationcontrollers/guestbook is missing the kubectl.kubernetes.io/last-applied-configuration annotation which is required by kubectl apply. kubectl apply should only be used on resources created declaratively by either kubectl create --save-config or kubectl apply. The missing annotation will be patched automatically.
replicationcontroller/guestbook configured
#5개확인
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-2kxdf 1/1 Running 0 5m20s
guestbook-4qs69 1/1 Running 0 11s
guestbook-ck5rz 1/1 Running 0 5m20s
guestbook-sbvpq 1/1 Running 0 11s
guestbook-v5dj9 1/1 Running 0 5m20s
#replicas를 3개로 변경
[root@k8smaster 04]# vi guestbook-rc.yaml
[root@k8smaster 04]# k apply -f guestbook-rc.yaml
replicationcontroller/guestbook configured
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-2kxdf 1/1 Running 0 6m14s
guestbook-ck5rz 1/1 Running 0 6m14s
guestbook-v5dj9 1/1 Running 0 6m14s
[root@k8smaster 04]#
* image변경 했을 때
[root@k8smaster 04]# vi guestbook-rc.yaml
[root@k8smaster 04]# k apply -f guestbook-rc.yaml
replicationcontroller/guestbook configured
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-2kxdf 1/1 Running 0 6m14s
guestbook-ck5rz 1/1 Running 0 6m14s
guestbook-v5dj9 1/1 Running 0 6m14s
# replicas는 5개로 변경, image는 choichoiyj로 변경
[root@k8smaster 04]# vi guestbook-rc.yaml
[root@k8smaster 04]# k apply -f guestbook-rc.yaml
replicationcontroller/guestbook configured
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-2kxdf 1/1 Running 0 15m
guestbook-ck5rz 1/1 Running 0 15m
guestbook-n8wlb 1/1 Running 0 6s
guestbook-qgh8r 1/1 Running 0 6s
guestbook-v5dj9 1/1 Running 0 15m
[root@k8smaster 04]# k describe rc guestbook
Name: guestbook
Namespace: default
Selector: app=guestbook
Labels: app=guestbook
Annotations: <none>
Replicas: 5 current / 5 desired
Pods Status: 5 Running / 0 Waiting / 0 Succeeded / 0 Failed
Pod Template:
Labels: app=guestbook
Containers:
guestbook:
Image: choichoiyj/k8s_guestbook:1.0
Port: 8080/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal SuccessfulCreate 15m replication-controller Created pod: guestbook-2kxdf
Normal SuccessfulCreate 15m replication-controller Created pod: guestbook-v5dj9
Normal SuccessfulCreate 15m replication-controller Created pod: guestbook-ck5rz
Normal SuccessfulCreate 10m replication-controller Created pod: guestbook-4qs69
Normal SuccessfulCreate 10m replication-controller Created pod: guestbook-sbvpq
Normal SuccessfulDelete 9m27s replication-controller Deleted pod: guestbook-4qs69
Normal SuccessfulDelete 9m27s replication-controller Deleted pod: guestbook-sbvpq
Normal SuccessfulCreate 43s replication-controller Created pod: guestbook-n8wlb
Normal SuccessfulCreate 43s replication-controller Created pod: guestbook-qgh8r
[root@k8smaster 04]# k get pods guestbook-2kxdf -o yaml
[root@k8smaster 04]# k get pods guestbook-2sbf2 -o yaml -> image가 변경되지 않았을 때
# pod삭제 후 image 확인
[root@k8smaster 04]# k delete pods --all
pod "guestbook-2kxdf" deleted
pod "guestbook-ck5rz" deleted
pod "guestbook-n8wlb" deleted
pod "guestbook-qgh8r" deleted
pod "guestbook-v5dj9" deleted
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-2sbf2 1/1 Running 0 7s
guestbook-8bb94 1/1 Running 0 7s
guestbook-9s6dh 1/1 Running 0 6s
guestbook-ps95z 1/1 Running 0 7s
guestbook-qxrpm 1/1 Running 0 7s
[root@k8smaster 04]# k describe rc guestbook
Name: guestbook
Namespace: default
Selector: app=guestbook
Labels: app=guestbook
Annotations: <none>
Replicas: 5 current / 5 desired
Pods Status: 5 Running / 0 Waiting / 0 Succeeded / 0 Failed
Pod Template:
Labels: app=guestbook
Containers:
guestbook:
Image: choichoiyj/k8s_guestbook:1.0
Port: 8080/TCP
Host Port: 0/TCP
Environment: <none>
Mounts: <none>
Volumes: <none>
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal SuccessfulCreate 55m replication-controller Created pod: guestbook-2kxdf
Normal SuccessfulCreate 55m replication-controller Created pod: guestbook-v5dj9
Normal SuccessfulCreate 55m replication-controller Created pod: guestbook-ck5rz
Normal SuccessfulCreate 49m replication-controller Created pod: guestbook-4qs69
Normal SuccessfulCreate 49m replication-controller Created pod: guestbook-sbvpq
Normal SuccessfulDelete 48m replication-controller Deleted pod: guestbook-4qs69
Normal SuccessfulDelete 48m replication-controller Deleted pod: guestbook-sbvpq
Normal SuccessfulCreate 40m replication-controller Created pod: guestbook-n8wlb
Normal SuccessfulCreate 40m replication-controller Created pod: guestbook-qgh8r
Normal SuccessfulCreate 21s replication-controller Created pod: guestbook-ps95z
Normal SuccessfulCreate 21s replication-controller Created pod: guestbook-2sbf2
Normal SuccessfulCreate 20s replication-controller Created pod: guestbook-qxrpm
Normal SuccessfulCreate 20s replication-controller Created pod: guestbook-8bb94
Normal SuccessfulCreate 20s replication-controller Created pod: guestbook-9s6dh
[root@k8smaster 04]# k get pods guestbook-2sbf2 -o yaml
apiVersion: v1
kind: Pod
metadata:
annotations:
cni.projectcalico.org/containerID: 9eee6e57155f033b0cca9a7b761668e8534e43c9036cfd211070db266cbc5171
cni.projectcalico.org/podIP: 10.102.249.48/32
cni.projectcalico.org/podIPs: 10.102.249.48/32
creationTimestamp: "2024-09-30T06:28:08Z"
generateName: guestbook-
labels:
app: guestbook
name: guestbook-2sbf2
namespace: default
ownerReferences:
- apiVersion: v1
blockOwnerDeletion: true
controller: true
kind: ReplicationController
name: guestbook
uid: 43ecca11-3b56-4757-9b8e-d6b42e3d526a
resourceVersion: "151633"
uid: 8e683406-a457-4167-9b51-6bcca267242f
spec:
containers:
- image: choichoiyj/k8s_guestbook:1.0
imagePullPolicy: IfNotPresent
name: guestbook
ports:
- containerPort: 8080
protocol: TCP
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /var/run/secrets/kubernetes.io/serviceaccount
name: kube-api-access-66j4b
readOnly: true
ReplicationController 삭제 : RC를 삭제하면 관리되던 POD도 함께 삭제
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-2sbf2 1/1 Running 0 2m18s
guestbook-8bb94 1/1 Running 0 2m18s
guestbook-9s6dh 1/1 Running 0 2m17s
guestbook-ps95z 1/1 Running 0 2m18s
guestbook-qxrpm 1/1 Running 0 2m18s
#특정 Pod에 레이블을 추가하거나 기존 레이블을 수정
[root@k8smaster 04]# k label po guestbook-2sbf2 app=guest --overwrite
pod/guestbook-2sbf2 labeled
#모든 Pod의 상태와 함께 각 Pod에 추가된 레이블을 조회
[root@k8smaster 04]# k get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
guestbook-2sbf2 1/1 Running 0 3m8s app=guest
guestbook-8bb94 1/1 Running 0 3m8s app=guestbook
guestbook-9s6dh 1/1 Running 0 3m7s app=guestbook
guestbook-b9bkp 1/1 Running 0 12s app=guestbook
guestbook-ps95z 1/1 Running 0 3m8s app=guestbook
guestbook-qxrpm 1/1 Running 0 3m8s app=guestbook
[root@k8smaster 04]# k scale rc guestbook --replicas=3
replicationcontroller/guestbook scaled
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-2sbf2 1/1 Running 0 5m58s
guestbook-8bb94 1/1 Running 0 5m58s
guestbook-ps95z 1/1 Running 0 5m58s
guestbook-qxrpm 1/1 Running 0 5m58s
# RC를 삭제하면관리되던POD도함께삭제
[root@k8smaster 04]# k delete rc guestbook
replicationcontroller "guestbook" deleted
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-2sbf2 1/1 Running 0 7m49s
[root@k8smaster 04]# k create -f guestbook-rc.yaml
replicationcontroller/guestbook created
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-2sbf2 1/1 Running 0 8m28s
guestbook-5xrvq 1/1 Running 0 6s
guestbook-7xrr8 1/1 Running 0 6s
guestbook-b7khk 1/1 Running 0 6s
guestbook-dh8lk 1/1 Running 0 6s
guestbook-tgvkx 1/1 Running 0 6s
[root@k8smaster 04]# k delete rc guestbook --cascade=false
warning: --cascade=false is deprecated (boolean value) and can be replaced with --cascade=orphan.
replicationcontroller "guestbook" deleted
[root@k8smaster 04]# k get rc
No resources found in default namespace.
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-2sbf2 1/1 Running 0 10m
guestbook-5xrvq 1/1 Running 0 2m6s
guestbook-7xrr8 1/1 Running 0 2m6s
guestbook-b7khk 1/1 Running 0 2m6s
guestbook-dh8lk 1/1 Running 0 2m6s
guestbook-tgvkx 1/1 Running 0 2m6s
#지금까지 생성한 쿠버네티스리소스 모두 삭제
[root@k8smaster 04]# k delete all --all
pod "guestbook-2sbf2" deleted
pod "guestbook-5xrvq" deleted
pod "guestbook-7xrr8" deleted
pod "guestbook-b7khk" deleted
pod "guestbook-dh8lk" deleted
pod "guestbook-tgvkx" deleted
service "kubernetes" deleted
[root@k8smaster 04]# k get pods
No resources found in default namespace.
[root@k8smaster 04]# k get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 53s
ReplicaSet생성
[root@k8smaster 04]# k create -f guestbook-replicaset.yaml
replicaset.apps/guestbook created
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-47czn 1/1 Running 0 11s
guestbook-fxctd 1/1 Running 0 11s
guestbook-rj6vw 1/1 Running 0 11s
[root@k8smaster 04]# k delete pod --all
pod "guestbook-47czn" deleted
pod "guestbook-fxctd" deleted
pod "guestbook-rj6vw" deleted
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-g6fdr 1/1 Running 0 6s
guestbook-hndgm 1/1 Running 0 6s
guestbook-l24b8 1/1 Running 0 6s
#relicaset image : choichoiyj으로 변경
[root@k8smaster 04]# vi guestbook-replicaset.yaml
[root@k8smaster 04]# k delete po --all
pod "guestbook-g6fdr" deleted
pod "guestbook-hndgm" deleted
pod "guestbook-l24b8" deleted
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-5qwhp 1/1 Running 0 8s
guestbook-79gzn 1/1 Running 0 8s
guestbook-lpsj4 1/1 Running 0 8s
[root@k8smaster 04]# k describe po guestbook-5qwhp
Name: guestbook-5qwhp
Namespace: default
Priority: 0
Service Account: default
Node: k8snode1/192.168.56.101
Start Time: Mon, 30 Sep 2024 15:49:05 +0900
Labels: app=guestbook
Annotations: cni.projectcalico.org/containerID: 1eec1c6b8d9b381313c74641a1ce608358f134a97c834b4ac98d004fe508dfbb
cni.projectcalico.org/podIP: 10.102.249.55/32
cni.projectcalico.org/podIPs: 10.102.249.55/32
Status: Running
IP: 10.102.249.55
IPs:
IP: 10.102.249.55
Controlled By: ReplicaSet/guestbook
Containers:
guestbook:
Container ID: containerd://ab91a6ee3ffc7ef621b0b13e6a4413f18065b377c1e33f3168b54069ee022a30
Image: choichoiyj/k8s_guestbook:1.0
Image ID: docker.io/choichoiyj/k8s_guestbook@sha256:90a2e1344a475dd003e515f7d0dfb3ba20784493f92e4a13d4fcc754f9a3c398
Port: <none>
Host Port: <none>
State: Running
Started: Mon, 30 Sep 2024 15:49:06 +0900
Ready: True
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-w449w (ro)
# label생성, 삭제
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-5qwhp 1/1 Running 0 2m8s
guestbook-79gzn 1/1 Running 0 2m8s
guestbook-lpsj4 1/1 Running 0 2m8s
[root@k8smaster 04]# k label po guestbook-5qwhp app=tree --overwrite
pod/guestbook-5qwhp labeled
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-58d4x 1/1 Running 0 7s
guestbook-5qwhp 1/1 Running 0 2m37s
guestbook-79gzn 1/1 Running 0 2m37s
guestbook-lpsj4 1/1 Running 0 2m37s
[root@k8smaster 04]# k get pods --show-labels
NAME READY STATUS RESTARTS AGE LABELS
guestbook-58d4x 1/1 Running 0 31s app=guestbook
guestbook-5qwhp 1/1 Running 0 3m1s app=tree
guestbook-79gzn 1/1 Running 0 3m1s app=guestbook
guestbook-lpsj4 1/1 Running 0 3m1s app=guestbook
[root@k8smaster 04]# k delete pods -l app=tree
pod "guestbook-5qwhp" deleted
[root@k8smaster 04]# k get pods
NAME READY STATUS RESTARTS AGE
guestbook-58d4x 1/1 Running 0 58s
guestbook-79gzn 1/1 Running 0 3m28s
guestbook-lpsj4 1/1 Running 0 3m28s
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